Speak

About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role As an AI Product Engineer at Speak, you'll play a pivotal role in developing the future of language learning and creating the most effective path to language fluency. Your primary responsibility will be developing innovative product experiences powered by Language Learning Models (LLMs) and deploying them to millions of users. Your tasks will span the full stack and beyond, from evaluating models and testing prompts to developing and iterating on various product features such as our conversational onboarding and lesson experiences, grammatical assessment and feedback, and personalized lessons. We're constantly pushing the boundaries of what LLMs can do to provide an exceptional and unparalleled language learning experience to users in over 30 countries worldwide. What you'll be doing Developing and deploying LLM-powered language learning products across the full stack, as well as enhancing the quality and performance of existing AI-powered features within Speak Collaborating cross-functionally with other Engineering teams, Applied ML, Product, Design, and Content Refining our process for building LLM apps, including best practices for prompting, experimentation/evaluation, LLM Ops, measuring quality and performance, etc. Scaling existing product features to many more users and languages What we're looking for 3-5+ years of experience in full stack/backend, product-focused software engineering You have real-world experience developing and deploying LLM apps and a strong understanding, gained through experience, of what works and what doesn't A keen intuition for improving performance and output quality of LLM systems Experience with LLM Ops and tools (e.g., vector databases, RAG, prompt ops) Strong product intuition — the ability to think broadly and cross-functionally about innovative LLM-powered capabilities and product experiences Ability to work independently and build at a high velocity Office San Francisco, CA Why work at Speak Join a fantastic, tight-knit team at the right time:  we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with:  we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature:  We're live in over 40 countries and launching in a number of new markets soon. We have dedicated offices in San Francisco, Ljubljana, Seoul, and Tokyo, and you’ll have the opportunity to talk to users i

About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role We are looking for an experienced Machine Learning Engineer to join our team and help develop cutting-edge speech recognition models that help teach language fluency. In this role you will take ownership of the end-to-end modeling pipeline, from training and experimentation to deployment and monitoring. You will also work closely with Product teams to design innovative learning experiences and measure the efficacy of production models as they affect our end users. We are a small, dynamic team where you will contribute as a developer and thought partner on team projects like ASR, assessment, pronunciation, content personalization, and much more. This is an incredibly exciting time to join an ML team designing a personalized learning experience that will revolutionize language learning for millions of learners worldwide — come join us! What you'll be doing Training and deploying ASR models end-to-end, including monitoring, performance tracking, and retraining Improving the pronunciation model that provides precise feedback, and make it more central to our learning app Creating metrics to measure ASR performance across tasks and languages Expanding our ASR systems to new languages and markets Building and maintaining data infrastructure such as training/evaluation datasets and labeling pipelines What we're looking for Extensive experience training large models on GPUs and deploying custom deep learning models Proficiency in Python and common Deep Learning frameworks like PyTorch Demonstrated experience owning ML pipelines end to end, from POC to production Strong communication skills and the ability to explain complex ML concepts to non-technical stakeholders Sharp product sense and an ability to think broadly and cross-functionally about model quality in the context of user experience Bonus Office San Francisco, CA Why work at Speak Join a fantastic, tight-knit team at the right time:  we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with:  we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature:  We're live in over 40 countries and launching in a number of new markets soon. We have dedicated offices in San Francisco, Ljubljana, Seoul, and Tokyo, and you’ll have the opportunity to talk to users in each of these regions on a regular basis as well as travel. Impact people's lives in a major way:

About this Internship We’re looking for a highly motivated full-stack engineering intern excited to work across the stack and contribute to building novel AI-powered product experiences. While your initial projects may lean toward the frontend, you’ll also gain exposure to backend development, helping us shape cutting-edge, conversationally driven language-learning products. This internship is designed for students or recent graduates who want to learn quickly, make a tangible impact, and work alongside a high-performing product, design, and machine learning team. What You’ll Be Doing Building innovative AI-driven product experiences and user interfaces on the web Contributing to the end-to-end development cycle of features, from idea to release Writing code quickly, shipping frequently, and seeing the real-world impact of your work Collaborating with a multidisciplinary team on product, design, and ML-driven projects What We’re Looking For Strong experience (through coursework, personal projects, or internships) building applications Excitement about learning both frontend and backend development in a fast-paced environment A balance of craftsmanship and scrappiness—you care about doing things the right way but can also move fast when needed Strong communication skills and a desire to collaborate across functions Strong foundation in computer science and software engineering (experience with React, Node, TypeScript, and/or Python is a plus). Office San Francisco, CA

About this Internship We’re looking for a highly motivated full-stack engineering intern excited to work across the stack and contribute to building novel AI-powered product experiences. While your initial projects may lean toward the frontend, you’ll also gain exposure to backend development, helping us shape cutting-edge, conversationally driven language-learning products. This internship is designed for students or recent graduates who want to learn quickly, make a tangible impact, and work alongside a high-performing product, design, and machine learning team. What You’ll Be Doing Building innovative AI-driven product experiences and user interfaces on the web Contributing to the end-to-end development cycle of features, from idea to release Writing code quickly, shipping frequently, and seeing the real-world impact of your work Collaborating with a multidisciplinary team on product, design, and ML-driven projects What We’re Looking For Strong experience (through coursework, personal projects, or internships) building applications Excitement about learning both frontend and backend development in a fast-paced environment A balance of craftsmanship and scrappiness—you care about doing things the right way but can also move fast when needed Strong communication skills and a desire to collaborate across functions Strong foundation in computer science and software engineering (experience with React, Node, TypeScript, and/or Python is a plus). Office San Francisco, CA

About This Internship As an iOS Engineering Intern at Speak, you’ll help build and ship features that power a language-learning app used by millions of learners around the world. You’ll work closely with experienced iOS engineers, backend engineers, Product, and Design to improve the core mobile experience across learning, monetization, and global expansion. This is a hands-on, high-impact internship where your work will ship to production. You’ll gain real-world experience building a consumer mobile product at scale while learning best practices in iOS development, experimentation, and product thinking. What You’ll Be Doing Building and shipping iOS features: Contribute to product features that improve the learning experience for millions of users. Improving the freemium experience: Help implement and test paywalls, pricing experiments, and monetization flows. Supporting global expansion: Assist with launching new markets and languages on iOS. Working on core platform systems: Contribute to areas like audio/video playback, speech-to-text experiences, or app performance. Collaborating cross-functionally: Partner closely with iOS engineers, backend engineers, Product, and Design to take features from idea to launch. Learning at scale: Gain exposure to A/B testing, experimentation frameworks, and production systems used by large consumer apps. What We’re Looking For Pursuing a degree in Computer Science, Engineering, or a related field. Experience building iOS applications using Swift (through internships, coursework, or personal projects). Familiarity with common iOS architectures (e.g. MVC, MVVM). Strong fundamentals in software engineering and a desire to write clean, maintainable code. Curiosity about mobile product development and how technical decisions impact users. Ability to learn quickly, take feedback well, and thrive in a fast-paced environment. Nice to have (but not required): Experience with SwiftUI Exposure to mobile experimentation, analytics, or A/B testing Familiarity with media, streaming, or speech-related features What You’ll Gain Real product impact: Your work will ship to production and reach millions of learners worldwide. Mentorship: Learn directly from experienced iOS engineers who will support your growth and development. Hands-on mobile experience: Build consumer-facing features using modern iOS tools and practices. Strong product intuition: Develop a product mindset by working closely with Product and Design. A high bar: You’ll be challenged, trusted, and supported to do meaningful work. Location: San Francisco, CA (office-based internship)

About us Our mission is to become the de facto way people learn foreign languages. We begin by teaching the next billion people English and Spanish English is the global language of business, culture, and communication, and over 1.5 billion people worldwide are actively trying to learn right now. Others dream of communicating with the half-billion native Spanish speakers across the globe. The problem is that it's nearly impossible to learn to speak a language without constant access to a speaking partner. Grammar and vocab apps don't really help – you need to actually converse with someone. Speak is on a journey to fix this. We're creating an AI-powered experience that replicates the flow of a conversation, without needing a human on the other end. The goal is to make it radically more accessible to be able to have conversations in a foreign language and eventually help hundreds of millions of people gain fluency who otherwise wouldn't be able to. We started on this journey over four years ago and we've still got a long ways to go. We're thoughtfully adding new team members only when we think they can truly play a big role in our mission. Speak is currently live in South Korea where we have quickly grown to become the top-grossing education app in the country. We recently launched in Japan as well and are expanding to more markets in the coming months. The company is well funded, raising a recent Series B backed by investors like OpenAI, Founders Fund, Y Combinator, Khosla Ventures, Lachy Groom, Josh Buckley, and others. We’re a team of just under 40 based primarily in SF, Seoul, and Ljubljana. About this role We’re looking for a Growth Marketing Manager who will be responsible for generating, managing, and executing growth initiatives to drive user acquisition in Japan as we continue to scale. The ideal candidate is someone who can identify and implement unconventional ideas to fuel our growth and has previous experience in multiple-channel marketing, such as performance marketing, ASO/SEO, affiliates, influencer marketing, and CRM. This role will report directly to the Head of Japan while working in close liaison with our global teams in US, Europe, and Korea. What you’ll be doing Develop and execute digital marketing initiatives for local marketing channels Optimize ROAS/ROI for paid marketing channels Directly manage ads on large platforms e.g. Apple, Google, Meta, and Twitter Set and run multiple experiments from scratch Complete weekly and monthly reports accurately Lead CRM strategies and activities Communicate and collaborate with global teams in English daily Analyze overall market trends in Japan Manage ad-hoc projects What we’re looking for? 3+ years of experience in marketing Hands-on experience in managing ads on large media platforms (e.g. Google, Meta, Apple, Twitter and/or ad networks) Strong track record of achieving goals and exceeding business expectations Highly analytical and number-driven Entrepreneurial mindset & self-motivated Ability to work under pressure, quickly adapt, and handle multiple tasks simultaneously Start-up experience is strongly preferred Native Japanese & Business English is mandatory Why work at Speak? Join a fantastic, tight-knit team at the right time:  we're growing super quickly, we just raised our Series A from some of the top investors in the valley, and we've achieved product-market fit. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with:  we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature:  We're live in South Korea and Japan, and launching in a number of new markets soon. We have dedicated offices in San Francisco, Ljub

About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role As the Lead for Marketing Analytics at Speak, you’ll own the systems, insights, and experimentation frameworks that power our global growth. You’ll be the key analytics partner to our Growth teams globally —responsible for everything from performance modeling to measurement infrastructure to media investment strategy. This is a rare opportunity to build the next phase of the Marketing Analytics function at Speak with a high degree of autonomy and ownership. We’re looking for someone who is not just analytically sharp but also deeply strategic—a builder who can scale systems and generate insights that shape the full funnel roadmap across marketing, growth, and growth product. What you’ll be doing Own and evolve Speak’s global marketing analytics function, including dashboards, attribution, experimentation, and incrementality/MMM. Partner with growth globally teams to guide investment decisions across performance, CRM, brand (TV, OOH), ASO/SEO, influencer, and offline channels. Design and manage the analytics infrastructure that supports accurate, fast, and scalable insights across markets and platforms Build and operationalize frameworks for measuring CAC, LTV, ROI, incrementality, and media efficiency. Accelerate experimentation velocity by supporting the design, execution, and analysis of A/B and market-level tests across creatives, lifecycle, and product surfaces. Collaborate cross-functionally with product, engineering, and finance teams to identify levers for acquisition, retention, and monetization. Shape forward-looking strategy by analyzing media fatigue, market saturation, and competitive benchmarks. Hire and mentor junior team members, scaling the team alongside the business What we’re looking for 5–7+ years of experience in high-performance analytics roles, with at least 3 years focused specifically on growth or marketing analytics. Deep familiarity with multi-channel marketing measurement , including attribution systems, LTV/CAC frameworks, and MMM/incrementality testing. Expertise in SQL , plus hands-on experience with BI tools like Mode , Looker , or Tableau. Experience designing and running marketing and pricing/packaging experiments (creative tests, landing pages, CRM, geo tests, etc.). Demonstrated ability to influence growth, product, finance, and marketing stakeholders with clear, actionable insights. Strategic mindset—someone who can zoom out and prioritize , not just execute analyses. Clear, compelling communicator who can explain complex ideas to non-technical audiences. Bonus points for Why work at Speak Join a fantastic, tight-knit team at the right time:  we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person

About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role We are looking for a senior backend focused but full-stack capable engineer to work on building novel AI-powered product experiences. The ideal candidate will have experience working in close coordination with product, design, and machine learning teams, as well as have a background in building polished consumer applications. This role sits at the center of developing our newest products focused on programmatic, conversationally-driven language learning and will be an instrumental contributor to the future of our company. What you'll be doing Building novel AI-driven product experiences and user interfaces on the web Full-stack engineering, but focused on creating scalable backend systems. Debugging complex streaming issues. Owning the entire development cycle of features, from conception to production You'll be able to write code very quickly, ship frequently, and make a huge impact on our business by helping us scale our content What we're looking for 5+ years of industry experience working as a Backend Engineer, preferably in a fast-paced startup environment Excellent problem-solving and communication skills, and the ability to work independently or as part of a team Coach and mentor other engineers Strong product sense: ability to think broadly/cross-functionally about product experiences Why work at Speak Join a fantastic, tight-knit team at the right time:  we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with:  we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature:  We're live in over 40 countries and launching in a number of new markets soon. We have dedicated offices in San Francisco, Ljubljana, Seoul, and Tokyo, and you’ll have the opportunity to talk to users in each of these regions on a regular basis as well as travel. Impact people's lives in a major way:  Learning a language is one of the single most life-changing skills one can learn, and right now 99% of people never achieve their goal because the process is broken. We’re helping millions of people achieve their goals and improve their lives. Speak does not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or

About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role Speak is seeking an experienced Product Designer to join our growing team of 3! This is a unique opportunity to help shape the future of language learning. This IC role will help designing innovative AI-driven conversational experiences that redefine how language is taught and learned. Partnering closely with our CEO, CTO, and cross-functional teams, you’ll play a key role in developing product strategy, creating new interactions, and evolving our core product experience. In this high-impact position, you’ll have the chance to design novel experiences across voice, audio, and video interactions, putting your stamp on features and product direction for an app that is already beloved by users. What you’ll be doing Work with teams across product, design, and engineering to prioritize and spec out new features to build Work directly with engineering to ensure a feature gets built, balancing your vision, technical feasibility, and user value Design new features all the way from concept to finalized pixels Design the UX and UI of new features across platforms, developing and implementing a consistent design language Take focused ownership of designing our AI tutoring product, rethinking the way our users learn language from the ground up Help support miscellaneous design work across the company as needed What we’re looking for? 6+ years of experience as a Product Designer in consumer-facing products. Extensive experience leading design projects for web and mobile products. Experience working on a small design team and "doing it all" You enjoy going deep on both UX and UI work You're a clear communicator and enjoy working closely with partners across teams, particularly in engineering You've invested in your craft and have experience with prototyping, micro-interactions, utilizing motion, and creating design palettes An ideal candidate will additionally have experience designing a consumer/content-forward app, audio and speaking experiences, as well as have a personal interest in language learning Office San Francisco, CA Why work at Speak Join a fantastic, tight-knit team at the right time:  we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with:  we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature:  We're live in over 40 countries and launching in a number of new markets soon. We have dedicat

About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role As an Android Engineer on Speak’s engineering team, you will be responsible for a variety of features including improving how we serve our content, run A/B tests on monetization features, support launching of new markets and new languages. You will collaborate closely with backend engineers and our partners in Product and Design. You’ll be responsible for shipping product features to millions of users. What you'll be doing Build growth loops -> referrals, in-app shareables, Speak on web Improve new user acquisition and user retention pricing and packaging Launch new markets and languages Improving our text to speech system Improving our audio and video streaming systems What we're looking for 5+ years of industry experience working as a Mobile Engineer, preferably in a fast-paced startup environment Proficiency in Kotlin, with a strong understanding of common mobile architectures including MVC/MVVM Reactive programming(RX Java, etc) Knowledgable in mobile build practices(eg jenkins, bitrise) Knowledgable in Google Play Billing Excellent problem-solving and communication skills, and the ability to work independently or as part of a team Coach and mentor other engineers Strong product sense: ability to think broadly/cross-functionally about product experiences Office San Francisco, CA Why work at Speak Join a fantastic, tight-knit team at the right time:  we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with:  we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature:  We're live in over 40 countries and launching in a number of new markets soon. We have dedicated offices in San Francisco, Ljubljana, Seoul, and Tokyo, and you’ll have the opportunity to talk to users in each of these regions on a regular basis as well as travel. Impact people's lives in a major way:  Learning a language is one of the single most life-changing skills one can learn, and right now 99% of people never achieve their goal because the process is broken. We’re helping millions of people achieve their goals and improve their lives. Speak does not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, o