Founding Member of the Technical Staff (Product/Full Stack) / React / Williamsb

Founding Full Stack Engineer (In-Person, NYC) Join a small, technical team building the future of LLM infrastructure. We're creating open-source tools that help developers optimize and monitor LLM applications at scale — from prompt tuning and routing to real-time evaluations and A/B testing. We're looking for a founding engineer who is excited to work across the stack and contribute to impactful, user-facing features. Our Stack Frontend: React, Radix UI Backend: Rust, TypeScript ML: Open-source tools for fine-tuning, evaluation, and experimentation Infra: Unified API for LLMs with built-in observability and routing This is an in-person role based in New York City. We work together in the office five days a week to maximize collaboration and speed. What You’ll Do Build and own high-impact features across our product surface Contribute to open-source tooling and infrastructure for LLM applications Collaborate with experts in frontend, backend, and machine learning Lead development of critical components like our observability dashboard Shape the early engineering culture, practices, and roadmap Required Skills & Experience 4+ years of experience as a software engineer Proven ability to take ownership of complex, full-stack projects Strong product sense and attention to design and developer experience Comfort working in fast-paced, in-person environments Curiosity and hunger for continuous learning and improvement The Offer Salary: Competitive and tailored to experience Equity: Founding-level equity package Benefits: Full health coverage, in-person perks, and generous PTO Growth: Work directly with world-class engineers and researchers Backers: Supported by top-tier investors with years of runway

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