**Company Description**
You've built the portfolio projects. You've done the tutorials, maybe an internship or two. You can write Python that works. But every job posting says "3+ years required" and every "junior" role turns out to want someone who's already done the job before.
We're not going to do that to you.
Lemmi is a voice-based AI mock interview platform. Users open the app, pick a target role, and have a real conversation with an AI interviewer - real-time audio, adaptive follow-ups, adjustable difficulty. When they're done, they get detailed feedback across communication, content, and structure, plus an AI coach that helps them improve. People use it to prep for specific companies, switch careers, or just stop blanking out in interviews they're qualified for.
The backend that powers all of this is Python. And we need another engineer to help build it.
**What this role looks like**
You'd work alongside our founding engineer on the backend systems that make interviews, feedback, and coaching work. This means FastAPI services, real-time WebSocket connections, AI/LLM integrations, and async data flows - not a CRUD app with a framework doing all the thinking for you.
You won't be filing Jira tickets and waiting for code reviews. You'll be in the room when we decide what to build, and you'll ship it the same week.
**Day to day:**
* Build and maintain API endpoints and backend services in Python (FastAPI)
* Work with AI/LLM APIs to power interview scoring, feedback generation, and coaching
* Help design and improve data flows that process real-time voice interactions
* Debug production issues - yes, even as a junior, because that's how you actually learn
* Collaborate directly with founders on product and architecture decisions
**What you need**
**Must have:**
* Python fundamentals - not just "I followed a Django tutorial", but you understand how the language works
* You've built at least one thing from scratch that actually ran - pet project, hackathon, internship deliverable, freelance work, anything
* Basic understanding of APIs and how web services communicate
* Comfortable with Git and working on a shared codebase
* You figure things out when you're stuck instead of waiting for someone to tell you what to do
**Nice to have:**
* Experience with FastAPI or async Python
* Familiarity with SQL databases and basic data modeling
* Exposure to AI/LLM APIs (OpenAI, Anthropic, etc.) - even from side projects
* Real-world work experience (internship, freelance, previous role)
* You've used Claude Code or Copilot as part of your actual workflow, not just tried it once
We don't care about your degree or years of experience. We care that you can write Python that works, you've built something real, and you want to get better fast.
**Why now**
Lemmi has paying users, a working product, and a backend that's growing in complexity every week. This is the point where one junior engineer's growth directly tracks with the company's growth. You'll learn more in six months here than in two years at a company where juniors maintain legacy code. And as we scale the team, the people who joined early are the ones who set the standard.
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