Mentor Talent Acquisition
Full Stack Engineer
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We are hiring Full Stack Engineers
For a profitable, fast-growing AI company building the operating system for investment research.
Location: London (On-site)
Salary: £110K–£140K + Equity
Our client's software helps private equity firms, consultants and financial institutions complete high-stakes research workflows dramatically faster, from diligence and memo writing to market mapping, research synthesis and strategic analysis. They're trusted by several of the world's top private equity firms, Big Four consultancies and leading financial institutions.
Company Overview
- Bootstrapped and profitable
- ~£20M+ in revenue, after growing 10x last year
- 60+ people across the company
- 20-person engineering team, doubling to 40 this year
- Core stack: TypeScript, Next.js and PostgreSQL
You'd be joining early enough to shape the product, engineering culture and company, but with enough traction that everything you build lands immediately in front of demanding, paying customers.
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The Role
You'll own features end to end, across the frontend, backend and data layer, and ship on a weekly cadence, not a quarterly one. You'll:
- Ship quickly, then ship again
- Design and build entirely new ways of working with computers
- Work on groundbreaking projects involving LLMs
- Speak directly with clients using what you build
- Use those conversations to shape product decisions
- Help define the engineering culture as the team doubles
Sample Projects
- Build frontier products capable of ingesting new types of research inputs
- Build an extremely low-latency, voice-to-voice survey tool that autonomously conducts high-volume research
- Build a mobile app from scratch in three weeks
- Create segmented knowledge graphs using unstructured-to-structured data transformations
- Build an AI-native CRM with deep links into that knowledge graph
About You
- 5+ years of engineering experience, we care about demonstrated competence, not pedigree
- Genuinely strong in TypeScript, Next.js and PostgreSQL, not merely familiar with them
- Able to build a polished React/Next.js interface or work through a hard TypeScript problem live and quickly, without relying on Copilot
- Solid foundations in data structures, system design and PostgreSQL
- High-agency and product-minded, you've owned projects end to end, argued for what should be built (not just how), and shipped without being handed a detailed spec
- You communicate clearly and want a client-facing role
- Based in London, or already committed to relocating, excited to work with the team in person in Farringdon
- Bonus: you've built and designed AI-powered products
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Benefits
- Private health insurance
- Gym membership
- Dinner provided when working late
- Team lunch provided every day at the office
- Frequent international off-sites (recently including Crete and Cancún)
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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