Founding Member of Technical Staff — Front-end / Design Engineering

HRB; New York (NY); On-site; USD 200,000 - 250,000; Full time

Job summary

An innovative company is seeking a Founding Member of Technical Staff to join their New York City team. This role focuses on front-end development for an open-source platform that enhances LLM applications. You will tackle challenging technical problems, design delightful interfaces, and contribute to a collaborative environment. The company values personal growth and offers competitive compensation, with a strong emphasis on open-source contributions. Join a talented team dedicated to reshaping developer tooling and enjoy the opportunity to expand your skills across the tech stack in a supportive, in-person setting.

Benefits

Competitive compensation

Open-source contributions

Learning and growth opportunities

Small, technical, in-person team

Best-in-class investors

Qualifications

• Strong technical background with experience in tackling complex problems.
• Passionate about design and creating delightful developer tools.

Responsibilities

• Integrate model gateway and optimize prompts for LLM applications.
• Build delightful user interfaces and contribute to the entire project.

Skills

Front-end Development

React

Design Engineering

Technical Leadership

Problem Solving

Learning Agility

Tools

Remix

Tailwind

Rust

Job description

GreenFoot Technologies is seeking a Founding Member of Technical Staff — Front End / Systems Engineering for our New York City-based Client. Our Client is an open-source platform that creates a feedback loop for optimizing LLM applications — turning production data into smarter, faster, and cheaper models. $200K – $250K

1. Integrate their model gateway
2. Send metrics or feedback
3. Optimize prompts, models, and inference strategies
4. Watch your LLMs improve over time

It enables a data & learning flywheel for LLMs by unifying:

1. Inference: one API for all LLMs, with <1ms P99 overhead
2. Observability: inference & feedback → your database
3. Optimization: from prompts to fine-tuning and RL (& even ?)
4. Experimentation: built-in A/B testing, routing, fallbacks

Role

Our Client is looking for a Founding Member of Technical Staff with a front-end or design engineering background.

Why not “engineer”? They will not make a distinction between engineers and researchers to encourage people to have a cross-functional scope and impact. Their CTO has a PhD in reinforcement learning but also writes infrastructure code in Rust.

Today, they particularly need help building delightful interfaces, but expect everyone to contribute to the entire project over time. The vast majority of your work will be open source. You’ll have an opportunity to continue to master your current skills with the flexibility to learn new ones from scratch.

They Are Looking For

• Strong technical background — You’ve tackled hard technical problems. You’re comfortable driving large projects from inception to deployment (to start, their observability dashboard).

• Passionate about your craft & design — You're excited about the idea of re-thinking developer tooling from first principles to build interfaces and workflows that don't just work but also delight.

• Background in front-end SWE — We’ve started building POCs using Remix and Tailwind, but ultimately we’re not experts in this area (for now!). You’ll complement the team with a strong background and technical leadership (esp. React).

• Hungry for personal growth — There are no speed limits. You’re excited about learning and contributing across the stack.

In-person in NYC — They work in-person five days a week in NYC. They work hard and obsess about the craft – but maintain and encourage a healthy lifestyle with a long-term mindset.

What They Offer

• Competitive compensation — They believe great talent deserves great compensation (salary, equity, benefits), even at an early-stage startup.

• Open-source contributions — The vast majority of your work will be open-source and public.

• Learning and growth opportunities — You’ll join with a background in front-end but will have the opportunity (& be encouraged) to expand your skill set way beyond that (curious about Rust or ML?).

• Small, technical, in-person team — You’ll work alongside a 100% technical team and help shape our vision, culture, and engineering practices.

• Best-in-class investors — We’re lucky to be backed by leading funds like FirstMark (backed ClickHouse), Bessemer (backed Anthropic), Bedrock (backed OpenAI), and many angels. We have years of runway and a long-term mindset.