Full Stack Engineer

Mentor Talent Acquisition; Faringdon; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Private health insurance

Dinner provided when working late

Team lunch provided every day at the  

Frequent international off-sites

Job summary

Mentor Talent Acquisition is hiring a Senior Full Stack Engineer to own features end to end across frontend, backend and data layers. The role involves shipping weekly, building AI-powered workflows and engaging with clients to shape product decisions.

You’ll contribute to a high-growth AI company, join a 20-person engineering team and relocate to London/Farringdon to work in person. You will design scalable systems, work on LLM-driven projects, and help establish a strong engineering culture as

Qualifications

• 5+ years of engineering experience with demonstrated competence.
• Strong expertise in TypeScript, Next.js and PostgreSQL.
• Ability to build polished React/Next.js interfaces and solve hard TS problems quickly.
• Solid foundations in data structures and system design.
• High-agency, product-minded, with end-to-end ownership and client-facing mindset.
• Willingness to relocate to London and work in person in Farringdon.
• Bonus: AI-powered product experience.

Responsibilities

• Own features end to end across frontend, backend and data layer.
• Ship on a weekly cadence, not quarterly.
• Design and build entirely new ways of working with computers.
• Work on groundbreaking projects involving LLMs.
• Speak directly with clients to inform product decisions.
• Help shape engineering culture as the team doubles.
• Build AI-native systems and knowledge graphs.
• Develop a mobile app from scratch in three weeks.

Skills

TypeScript

Next.js

PostgreSQL

React

System design

Data structures

Client-facing

Education

Bachelor's degree in a relevant field

Job description

We are hiring Full Stack Engineers for a profitable, fast-growing AI company building the operating system for investment research.

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.

• 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.

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
• 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
• Private health insurance
• Dinner provided when working late
• Team lunch provided every day at the office
• Frequent international off-sites (recently including Crete and Cancún)