Application Software Engineer (Endpoint Security)

Note: Even though the job posting only mentions US, we are looking for candidates from all NATO countries.

Please only apply directly to this job posting. Messages sent outside of this platform will not be considered.

About Oneleet

Oneleet is a cybersecurity startup with a mission to revolutionize the industry. It aims to make effective cybersecurity easy and painless for companies by providing a comprehensive platform that helps companies build, manage, and monitor their cybersecurity program.

We’re essentially building an all-in-one security platform that will allow companies to have everything they need under one roof to build a secure company. We have already built our own ASM (Attack-Surface Monitoring), CSPM (Cloud-Security Posture Management), MDM (Mobile-Device Management) and Vulnerability Management modules, and have many more on the roadmap.

Oneleet is backed by top-tier venture capital firms including Y Combinator, and is part of their S22 cohort. The founding team has over 10 years of penetration testing and cybersecurity experience.

Be a part of our team of opinionated rebels and help us create a category-defining company on a mission to reshape the broken and fragmented cybersecurity industry.

Who we’re looking for

At Oneleet we value individuals who are passionate and motivated to make a large impact in the cybersecurity ecosystem. We are looking for rebels with a growth mindset who love to take ownership, who exhibit excellent communication skills, and who have a "can-do" attitude towards technical challenges and innovation.

A rebel’s mindset — we’re frustrated with the state of the cybersecurity industry, and believe that a rebel mindset is key to changing it. Opinionated (but not obstinate) — we believe that having an opinion is better than having no opinion, and helps us move more quickly.

You’re excited about a role that requires hands-on coding, enabling you to address challenges and play a substantial role in shaping the trajectory of the Oneleet platform. Expert time management; we work with clients all over the world as well as have a team that is spread throughout multiple continents. We don’t expect anyone to be working or available 24/7- but we are looking for someone comfortable operating outside of the 9-5 mentality. Our core hours are 9am-1pm EST and expect that you can schedule your day effectively outside of that, while being flexible.

Job Description

As an Engineer on the Oneleet Agent team, you'll be responsible for developing and maintaining our cross-platform endpoint security agent that monitors, configures, and protects employee devices. You'll work on everything from low-level system configuration automation to high-level API design that enables seamless communication between endpoints and our cloud platform.

You'll architect solutions that collect security telemetry, enforce compliance policies, and monitor for vulnerabilities across Windows, macOS, and Linux environments. This role requires deep technical expertise in system programming, security best practices, and the ability to build software that operates reliably in diverse enterprise environments.

As a seed stage startup, you'll collaborate directly with the founding team and have significant influence over the technical direction of our endpoint security capabilities.

Key Responsibilities

• Design and implement cross-platform agent functionality for Windows, macOS, and Linux using Go and JavaScript
• Build low-level configuration automation and system monitoring capabilities that interact with OS-specific APIs and security frameworks
• Develop secure communication protocols between agents and our cloud platform using gRPC or REST APIs
• Implement real-time threat detection and response capabilities at the endpoint level
• Create robust update and deployment mechanisms that ensure agents remain current without disrupting user workflows
• Build telemetry collection systems that provide visibility into device security posture while respecti