Harnham
Founding Full-Stack Engineer (React + Rust)
AI Infrastructure - Open Source
$200,000 - $300,000 + Equity (~1%)
Onsite - Williamsburg, NYC
Join a deeply technical AI startup as a
founding engineer , building the open-source infrastructure powering the future of LLM optimization. With world-class backers and a team of Stanford, Oxford, and CMU alumni, this is an opportunity to own critical product features from day one and help shape a category-defining developer platform.
THE COMPANY
This stealth-mode startup is building an open-source platform that helps teams
optimize LLMs in production
- think observability, inference routing, and programmatic evaluation in one powerful feedback loop. The company is backed by investors behind OpenAI, ClickHouse, and Anthropic, and has years of runway to support deep open-source investment.
THE ROLE
As Founding Full-Stack Engineer, you will: Lead the build of the
observability dashboard
and core user-facing tools Work in
React and Rust
to craft high-performance, developer-first experiences Collaborate directly with the CEO, CTO, and ML researchers to shape product and infrastructure Contribute
open source code
that impacts the broader LLM/devtools ecosystem Influence product direction and engineering culture as a true early team member YOUR SKILLS & EXPERIENCE
Strong technical foundation with experience driving 01 product builds Proficiency in
React
and
Rust
(must-have) Experience designing technical UIs for engineers/ML users Track record of OSS contributions or a strong GitHub presence is a plus Passionate about developer experience and the craft of software engineering Open to H1B or O1 transfer for exceptional candidates BENEFITS
$200K-$300K base + meaningful equity (~1%) Work alongside an all-technical founding team from Stanford, Oxford, CMU, AWS, and Meta Learn from leaders in OSS (Radix UI, RemixJS), Rust, and ML research (NeurIPS, Meta AI) Contribute to open-source every day Onsite collaboration in a top-tier Brooklyn workspace
AI Infrastructure - Open Source
$200,000 - $300,000 + Equity (~1%)
Onsite - Williamsburg, NYC
Join a deeply technical AI startup as a
founding engineer , building the open-source infrastructure powering the future of LLM optimization. With world-class backers and a team of Stanford, Oxford, and CMU alumni, this is an opportunity to own critical product features from day one and help shape a category-defining developer platform.
THE COMPANY
This stealth-mode startup is building an open-source platform that helps teams
optimize LLMs in production
- think observability, inference routing, and programmatic evaluation in one powerful feedback loop. The company is backed by investors behind OpenAI, ClickHouse, and Anthropic, and has years of runway to support deep open-source investment.
THE ROLE
As Founding Full-Stack Engineer, you will: Lead the build of the
observability dashboard
and core user-facing tools Work in
React and Rust
to craft high-performance, developer-first experiences Collaborate directly with the CEO, CTO, and ML researchers to shape product and infrastructure Contribute
open source code
that impacts the broader LLM/devtools ecosystem Influence product direction and engineering culture as a true early team member YOUR SKILLS & EXPERIENCE
Strong technical foundation with experience driving 01 product builds Proficiency in
React
and
Rust
(must-have) Experience designing technical UIs for engineers/ML users Track record of OSS contributions or a strong GitHub presence is a plus Passionate about developer experience and the craft of software engineering Open to H1B or O1 transfer for exceptional candidates BENEFITS
$200K-$300K base + meaningful equity (~1%) Work alongside an all-technical founding team from Stanford, Oxford, CMU, AWS, and Meta Learn from leaders in OSS (Radix UI, RemixJS), Rust, and ML research (NeurIPS, Meta AI) Contribute to open-source every day Onsite collaboration in a top-tier Brooklyn workspace