At a Glance
- Tasks: Own full-stack development, ship features quickly, and mentor future engineers.
- Company: Fast-paced startup in Hoxton, London, transforming the real estate industry with AI.
- Benefits: Competitive salary, late-night Uber rides, DoorDash dinners, and a brand new MacBook.
- Other info: High-intensity environment with rapid feedback and ownership opportunities.
- Why this job: Join us to revolutionise a $1T+ industry and make impactful decisions.
- Qualifications: Proficient in Python, FastAPI, Next.js/React, and system design.
The predicted salary is between 60000 - 80000 £ per year.
Hoxton, London. In-office 5 days a week, on-site. PLEASE DO NOT APPLY IF YOU ARE NOT IN THE UK. This will be the hardest job you've ever had. We operate with the intensity and speed of an SF YC-stage startup, but in London. Shipped features, not endless planning. We need an engineer who can own technical systems end-to-end and thrive in a fast-paced, high-stakes, five/six-day-a-week environment.
What we’re building
Our starting point is selling to real estate agencies, where we’re replacing manual workflows with AI employees that handle tenant engagement, landlord outreach, compliance, and maintenance autonomously. Property is one of the most important parts of people’s lives, and the experience of buying, selling or renting one is still terrible. The industry is fragmented, compliance-heavy, and deeply inefficient. It runs on spreadsheets, missed calls, and manual processes that haven’t changed in 30 years. Nobody has built the definitive AI agent layer for real estate yet. That’s what we’re doing.
Backed by Entrepreneurs First and top-tier VCs. Live with agencies across the UK with early US traction. Building AI agents that don’t just assist. They do the work.
The Role
As a Full-Stack Engineer, you’ll:
- Own backend, frontend, infrastructure, and deployment. Full-stack ownership.
- Make architectural decisions that shape our product.
- Ship features from concept to production in days, not weeks/months.
- Work closely with the founding team on strategic technical direction.
- Mentor future engineers as we scale (you’ll be early enough to shape culture).
- Debug production issues at 2am without hesitation, then ship the fix by morning.
You’ll touch every layer of what makes our AI agents actually useful in production:
- The Python / FastAPI backend that orchestrates our agents.
- LLM orchestration and RAG pipelines.
- Telephony and voice infrastructure (real-time calls, STT/TTS).
- Messaging integrations (WhatsApp, SMS, email).
- API integrations with property management and CRM systems.
- A Next.js / TypeScript frontend that operators and customers actually use.
Required Skills
Mandatory (non-negotiable)
- Python. Backend systems, scripting, data processing.
- FastAPI. Async APIs and event-driven services.
- Next.js / React. Production apps real users touch.
This is not a feature-builder role. You’re creating entire systems, making tradeoffs, and owning their outcome end-to-end.
Highly desired
- Track record building products from 0 to 1 or scaling at an early-stage startup.
- Hands-on with LLMs in production (orchestration frameworks, vector databases, evals).
- System design and architecture experience.
- Ability to read unfamiliar code and understand it quickly.
Nice to have
- 1+ years at a top-tier tech company.
- Desire to found in the future.
We value taste, speed, and a maker’s mindset over credentials.
How we work
This is not a 9-to-5 role. We operate with YC startup culture in London. 12-hour days are standard. 10am to 10pm or similar flexibility. Five-Six-day working weeks. 5 days - In-office in Hoxton. High-intensity environment. Fast decisions, high stakes, rapid iteration. Fast feedback loops. Ideas to code to production in days. High ownership, high autonomy. You make calls, not committees.
We are rebuilding a $1T+ industry and we don’t think that happens on a 9-to-5. If you’re optimising for work-life balance, predictable hours, or a slow pace, this isn’t for you. We need people energised by intensity, not drained by it.
This role isn’t for you if
- You want a predictable 9-to-5.
- You optimise for work-life balance over output.
- Six days a week in the office sounds exhausting rather than energising.
- You want to feature-build instead of system-build.
What we offer
- Front-row seat to building the AI agent layer for a $1T+ industry.
- A team obsessed with winning. Small, fast, building something that matters.
- Uber home when you’re working late.
- DoorDash dinners in the office.
- Brand new MacBook.
But the real offer is ownership. You own the system. You make the calls. No committees, no waiting for permission.
Full-Stack Engineer employer: Letty
Join a dynamic team in Hoxton, London, where you'll be at the forefront of revolutionising the real estate industry with cutting-edge AI technology. We foster a high-intensity work culture that prioritises ownership and rapid iteration, offering you the chance to make significant architectural decisions and mentor future engineers as we scale. With a focus on meaningful impact, competitive benefits like Uber home for late nights, and a brand new MacBook, this is an exceptional opportunity for those who thrive in a fast-paced environment.
StudySmarter Expert Advice🤫
We think this is how you could land Full-Stack Engineer
✨Tip Number 1
Get to know the company inside out! Research their products, culture, and recent news. This will help you tailor your conversations and show that you're genuinely interested in what they do.
✨Tip Number 2
Network like a pro! Connect with current employees on LinkedIn or attend industry meetups. A friendly chat can sometimes lead to a referral, which is golden when applying for a role.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and system design knowledge. Practice solving problems under time constraints to mimic the fast-paced environment you'll be working in.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen. Plus, it shows you’re serious about joining our team and ready to dive into the action.
We think you need these skills to ace Full-Stack Engineer
Some tips for your application 🫡
Be Authentic:When you're writing your application, let your personality shine through! We want to see the real you, so don’t be afraid to show your passion for tech and how you can contribute to our mission.
Tailor Your Application:Make sure to customise your application to highlight your experience with Python, FastAPI, and Next.js. Show us how your skills align with what we’re building and why you’re excited about this role!
Showcase Your Projects:Include links to any relevant projects or code samples that demonstrate your full-stack capabilities. We love seeing what you've built and how you approach problem-solving in real-world scenarios.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for this exciting opportunity to join our team!
How to prepare for a job interview at Letty
✨Know Your Tech Stack Inside Out
Make sure you’re well-versed in Python, FastAPI, and Next.js/React. Be ready to discuss your experience with these technologies and how you've used them to build systems from the ground up. Prepare examples of past projects where you’ve taken ownership of the entire stack.
✨Showcase Your Problem-Solving Skills
Expect to face technical challenges during the interview. Be prepared to walk through your thought process on debugging and system design. Highlight instances where you’ve solved complex problems quickly, especially under pressure, as this role demands rapid iteration.
✨Emphasise Your Startup Experience
If you’ve worked in a fast-paced startup environment before, share those experiences. Talk about how you thrived in high-stakes situations and contributed to building products from 0 to 1. This will show that you understand the intensity and speed required for this role.
✨Demonstrate Your Passion for Innovation
This company is looking for someone who’s excited about transforming the real estate industry with AI. Share your thoughts on the future of AI in property management and how you can contribute to that vision. Show that you’re not just a coder but a maker who’s eager to innovate.
