Company Description

You know that feeling before a big interview? You've read every "top 10 behavioral questions" list, rehearsed answers in your head, maybe even talked to your mirror. But none of that prepares you for the moment someone asks a follow-up you didn't expect, and your mind just... goes blank.

That's the problem we're solving. Lemmi lets you practice with an AI interviewer that talks back - real-time voice, real follow-ups, real pressure. Afterwards you get scored on communication, content, structure, and an AI coach helps you fix what's actually weak. Not generic tips. Specific feedback on your answers.

People use it to prep for top companies, to switch careers at 35, to stop freezing up in interviews they're technically qualified for. It works and we need someone to make the experience significantly better.

What this role looks like

You'd own the frontend together with our Founding Engineer. The product has real-time voice interactions over WebSockets, feedback dashboards with multi-dimensional scoring, a coaching interface with chat and practice tasks.

Day to day:

Build and ship features in our React web app
Own the interview flow UI - real-time audio, conversation state, transitions
Work directly with founders on what to build next
Set up frontend architecture and patterns for a codebase that's growing fast

Who we're looking for

Must have:

Strong HTML, CSS, and TypeScript- not just framework knowledge, actual fundamentals
Experience with React (or a similar component-based framework)
Understanding of responsive design and cross-browser quirks
Comfortable with Git, PRs, and async collaboration
Ability to take a vague product idea and turn it into a working UI without waiting for a pixel-perfect spec

Nice to have:

Experience with real-time UI - WebSockets, streaming data, audio/video
Experience working in early-stage teams where you wore multiple hats
You've built something from scratch that real people used - side project, freelance, startup, anything
Claude Code or Codex advanced usage skills in day to day tasks

We don't filter on years of experience. We filter on whether you can build interfaces that people actually want to use.

Why now

Lemmi has paying users, a working product, and a small team. One frontend developer's decisions will shape what thousands of people interact with. You'll ship features the same week you build them. You'll have more product influence than most senior roles at bigger companies offer.

We're scaling the team - early people set the standard.

Frontend Developer for Early-Stage Startup (high-impact)