Founding Engineer

at MangoDesk — Long-horizon RL environments

San Francisco, CA, USFull-timeAny (new grads ok)$100K - $200K0.50% - 1.50% equityYC-S25

What the role involves

As a founding member of our engineering team, you’ll play a pivotal role in building the data and evaluation infrastructure that powers frontier models. Joining as one of our earliest hires, you’ll take on significant ownership - leading projects from start to finish and seeing direct and immediate impact of your work.

Company Overview

We're a YC-backed startup on a mission to bridge the gap between AI and the $5T knowledge work economy through cutting-edge data infrastructure and environments. We're a technical team with experience from Scale AI, Uber, and previously founding a successful AI company. We’re based in San Francisco, CA, and recently raised an oversubscribed seed round led by top-tier VCs.

Required Qualifications

Strong technical / computer science fundamentals.

Experience building production-grade backend / full-stack systems

Deep understanding of scalability challenges and good system design.

The ability to take ambiguous requirements, conduct research, analyze tradeoffs, and own project execution end-to-end, balancing speed vs reliability.

Strong communication skills and a bias toward ownership

Preferred Qualifications

1+ years of experience as a SWE

Prior experience at startups / high-growth companies

Experience with applied AI / AI research - specifically in post-training / RL

About MangoDesk

We help AI become better at real-world workflows through production-grade RL environments.

Full MangoDesk profile

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