Software Engineer - Backend & AI Agents

## About the role You work directly with the founder from day one. You sit inside product decisions. You own what you ship. This is not a role where you wait for tickets. We'll hand you a problem and expect you to run with it. We also expect you to say "I'm stuck" the moment you are. Contract to start. Prove yourself, and it becomes full-time with equity. ## You should have - Touched LLM finetuning. LoRA, QLoRA, or a full run — even a small one. You know when finetuning is worth it and when a good prompt is enough. We don't need you finetuning every day. We need to know you're past the tutorial stage. - Shipped at least one real AI agent. Not a demo. Not a hackathon. Something that ran, had users, and broke in production. We want to hear about the breakage. - Built with context engineering, memory, and tools. You know when to use multiple agents and when one good agent with good tools does the job. - Strong in Node.js + TypeScript OR Python + FastAPI. Comfortable in the other. Postgres and Docker are basics. - Shipped one payment gateway end-to-end. Stripe, Razorpay, Cashfree, or LemonSqueezy. Webhooks, idempotency, reconciliation — the boring parts. - Fluent with Claude Code, Codex, Cursor, or Windsurf. You ship 3x faster because of them. ## Bonus - You've built evals, debugged agents, or written prompt regression tests. - You've worked with RAG or retrieval at real scale. - You run a side project that people actually use. ## Not for you if - You need a ticket to start. - You want stability over growth. - You've never shipped an agent. - You go silent for days (weekends off is fine — silence is not). ## For you if - You've shipped something real with AI agents and want to do it ten more times this year. - You get energy from building, not meetings. - You think about what to build even when nobody asked. - You want to join something from day one, not after it's figured out. ## How to apply Email [email protected] with subject: "I build agents" Send three things: - One agent you shipped. What it does. How you built it. What broke, and what you did about it. - Your GitHub or anything live. Links, not PDFs. - One thing you'd build or fix on 91agents.dev right now — be specific, and give us one sentence on why. That's it. No CV. No cover letter. Just the work.