As a Full-Stack Engineer at Letty, you will build autonomous AI employees replacing manual workflows in real estate. Working at YC-stage intensity in Hoxton, you will own the entire stack from LLM orchestration to frontend. This is a high-stakes role for engineers who thrive on speed, shipping daily, and solving complex architectural challenges.
Full-Stack Engineer at Letty
Letty is looking for a Full-Stack Engineer to help build the AI agent layer for the $1T+ real estate industry. Backed by Entrepreneurs First and top-tier VCs, we are replacing manual workflows with autonomous AI employees. This isn't your typical 9-to-5; we operate with SF YC-stage intensity in Hoxton, London. You will own everything from LLM orchestration and telephony infrastructure to Next.js frontends. If you are a high-speed builder who thrives in 12-hour days and wants to own entire systems from scratch, this is the hardest and most rewarding job you will ever have.
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Location
London, United Kingdom
Compensation
£75k-£110k + Equity
Company
Letty
Role overview
Letty is rebuilding the real estate agency model with domain-specific digital workers that handle tenant engagement, landlord services, compliance, and maintenance.
What you will do
- Architect and build end-to-end systems including Python/FastAPI backends, LLM orchestration pipelines, and telephony infrastructure for real-time voice calls.
- Ship user-facing features using Next.js and TypeScript, taking products from initial concept to production in days rather than months.
- Own the full engineering lifecycle, from database modeling in PostgreSQL to managing production deployments and observability on GCP or AWS.
Who this is a fit for
- Expert proficiency in Python and TypeScript with a track record of building complex, production-grade systems from zero to one.
- Experience with LLM orchestration, RAG pipelines, or event-driven services, demonstrating a maker mindset rather than just feature-building.
- Thrives in a high-intensity startup environment, prioritizing rapid output and system ownership over a traditional 9-to-5 schedule.
Why this role is remarkable
- Ownership of a massive $1T+ market transformation by building the definitive AI agent layer for real estate.
- Backed by elite investors including Entrepreneurs First and top-tier VCs, with active traction in the UK and US.
- Unparalleled equity upside and the chance to shape the culture of a high-intensity, mission-driven founding team.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Letty wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.