Senior Backend Engineer
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Hiring is broken - scaled for volume, stripped of the relationships that make it work. Help us build the system that fixes it.
Quick Facts
- Salary: £80,000–£150,000 + meaningful equity
- Office: London (near London Bridge), hybrid — 3+ days/week
- Stack: Python, FastAPI, Postgres, Redis, Docker, Pydantic AI, GCP
About Dex
Hiring is broken: scale it and lose the human element, keep it personal and cap how many people you can help. Dex exists to fix that, using AI to connect talent and opportunity at scale while keeping the relationships and people that actually make hiring work. Backed by a16z and Concept Ventures with $3.1M raised at pre-seed, we're growing fast, and are already partnered with some of the best tech companies around the world!
About the Role
We're hiring a Senior Backend Engineer to own the systems at the centre of this: the agent infrastructure, evaluation pipelines, product backend, and matching engine. The stack is Python end-to-end: FastAPI, Postgres, Redis, Pydantic AI, all running on GCP.
You'll split your time across four areas depending on your strengths: product backend, agent backend, observability, and matchmaking. You'll work with the engineering team and founders to set technical strategy and architecture as we scale, whilst also staying hands-on to help deliver life changing opportunities to our users.
About You
- You have strong backend experience in Python and solid CS fundamentals — you're comfortable reasoning about data structures, concurrency, and system design
- You've shipped LLM-powered features in production with real users, and you understand what it takes to keep agentic systems reliable at scale
- You write clean, maintainable code and care about the codebase you leave behind
- You break down complex problems systematically and reach for the pragmatic solution over the clever one
Note: We know that talent can't be summed up in a few bullet points. Even if you don't match all the criteria we've mentioned. we don't want that to be a barrier. If you're excited about what we're building, we want to hear from you!
What we offer
Joining Dex means being part of a fast-moving, ambitious team building something meaningful. In addition, we offer:
- Full healthcare for you and your loved ones
- Exceptional wellbeing, health and learning support
- Flexible working with minimum 3 days a week in our office near London Bridge
- Brand-new Macbook Pro
- Gym membership
- An opportunity to work with and learn from an experienced team, and grow with the business