Senior Full-Stack Engineer (React/Typescript)

🔒 Confidential Employer
Posted 3 May 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
SALARY
£180,000 / year
CATEGORY
Software Engineering
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

TypeScript Node.js PostgreSQL React AWS GCP Prompt Engineering LLM APIs

FULL DESCRIPTION

Senior Full-Stack Engineer (React/Typescript)

[Employer hidden — view at passion-project.co.uk]

Location: Antwerp; London (Hybrid)

Employment Type: Full-time

Compensation: $80K – $180K

What we are building at [Employer hidden]

[Employer hidden] is the AI research platform enabling fast, affordable, and high quality consumer / B2B research. Global brands like Unilever, Google, and Orange use our AI video interviewer to across insights, marketing, and product teams.

The Role

As a Senior Full-Stack Engineer at [Employer hidden], you'll spearhead the development lifecycle for the AI-powered platform, taking ownership of features from initial specifications through deployment. You'll build applications where AI is seamlessly integrated as core technology, not just an add-on feature. You'll stay at the cutting edge of AI capabilities. A big part of your role will involve direct contact with our customers. Since we have no product managers, you'll be responsible for directly interfacing with clients, understanding their needs, and translating those into technical solutions. This customer-facing aspect is crucial for ensuring we build exactly what solves their problems. Beyond coding, you'll actively participate in product refinement and brainstorming sessions, directly influencing both what we build and how we build it, making this an opportunity to have significant technical and strategic impact.

What We’re Looking For

  • 6+ years of experience building full-stack applications with TypeScript and Node.js.
  • Strong backend experience: designing APIs, working with PostgreSQL, and managing background jobs and async workflows.
  • Solid frontend skills with React. Experience with React Router v7 or Remix is a plus.
  • Experience with cloud infrastructure (AWS and/or GCP) — you're comfortable with services like S3, media pipelines, and deployment tooling.
  • Experience building AI-driven applications (e.g. prompt engineering, working with LLM APIs, and/or fine-tuning experience are a plus).
  • Can independently lead projects from concept to launch.
  • Excellent written and verbal communication skills in English with a keen eye for detail.
  • A collaborative mindset, able to work autonomously in a small, fast-paced team.

Why Join Us?

  • Work with a highly experienced technical team. We are only hiring senior engineers.
  • Work with the latest AI models at the cutting edge of what's possible.
  • Work at a hyper-growth, Y Combinator-backed startup where speed and impact matter.
  • Collaborate with a team that is obsessed with excellence and execution.
  • Competitive salary, performance-based incentives, and equity.
  • Flexible working hours and PTO.

Compensation Range: $80K - $180K

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