Senior Product Engineer

Wave Talent Limited; Greater London; On-site; GBP 102,000 - 138,000; Full time

Job summary

Wave Talent Limited is partnering with a seed-funded AI platform to hire a Senior Product Engineer specialising in TypeScript. The role is London-based with 3 days on-site at Old Street, offering real ownership across the stack and a direct line to product decisions.

You will shape architecture, build onboarding tooling as organisations migrate off legacy systems, drive features from concept to production, and write tests and docs.

Qualifications

• Demonstrable full-stack shipping experience across frontend and backend.
• Multiple years shipping code and owning complex systems.
• Product-minded and autonomous with minimal supervision.
• Evidence of output via GitHub or a portfolio.

Responsibilities

• Shaping architecture for new and existing features.
• Building tooling to support onboarding and migration off legacy systems.
• Taking complex features from idea to production and ongoing maintenance.
• Writing tests and documentation and sharing work with the team.

Skills

Full-stack

TypeScript

Autonomy

Product-minded

Output evidence

Tools

GitHub

Job description

Senior Product Engineer (TypeScript) | London | £120,000 | 3 days on-site, Old Street

We’re partnering with a seed-funded AI platform helping charities and non‑profits run more effectively, think safeguarding, funding applications, bookings, grants, and statutory reporting, for organisations that have historically been underserved by decent software.

The engineering team is small by design, currently 4 people, with no daily scrum and no design documents. Everyone ships, everyone thinks about the product, and the work genuinely matters to the people using it: over 1,500 charities and 45 foundations already rely on the platform, and it’s powering £55m of charitable funding annually, growing 4x year on year.

They’re now hiring a Senior Product Engineer to take on real ownership across the stack, someone who wants to be close to the product, close to the users, and trusted to make good decisions without layers of process getting in the way.

What you’ll be doing

• Shaping architecture for new and existing features, not just implementing to spec
• Building tooling to support onboarding as more organisations migrate off legacy systems
• Taking complex features from initial idea through to production and ongoing maintenance
• Writing tests and documentation, and showcasing your work to the rest of the team

What they’re looking for

• A genuinely full-stack engineer with real, demonstrable depth on both the frontend and backend, not someone who’s dabbled in everything but is clearly weighted one way. If you can point to specific things you’ve shipped on both sides, say so
• Multiple years of experience shipping code and managing complex systems, ideally having taken a product from start to end solo
• Genuinely product-minded, prioritising getting things right first time over ticking boxes
• Someone who does their best work with autonomy and accountability, not hand‑holding and process
• A GitHub, portfolio or a couple of specific examples of what you’ve built helps enormously here, this team hires on evidence of output, not just years on a CV

Why this one’s worth a look

• Real ownership from day one, this isn’t a feature factory with tickets handed down
• The mission is tangible: the software you write directly increases funding reaching the charity sector
• Small, low-politics team with high individual trust and responsibility
• Open to AI tooling as part of your day‑to‑day workflow, so long as the output holds up

The process

A focused 2-stage process: a short intro call with the founder, then an in-person technical interview which, if it goes well, ends with an offer.