Senior Full-Stack Engineer (Ref: 195894)

Location – London (Waterloo)

Salary – £70k – £85k

samuel.robinson@forsythbarnes.com

Senior Full-Stack Engineer

We’re looking for a Senior Full-Stack Engineer to join an established development programme building and evolving a production-critical internal trading platform for a large enterprise client.

This is a long-term, actively evolving system where performance, reliability, and maintainability are key. You’ll join a highly experienced team of senior engineers and QA specialists, working in an environment that values technical ownership, autonomy, and thoughtful engineering decisions.

What you’ll be doing

• Designing, building, and maintaining features across the full stack of a trading platform
• Taking end-to-end ownership of features from design through to production
• Collaborating closely with platform and DevOps engineers on build pipelines, observability, and operational improvements
• Communicating directly with stakeholders to clarify requirements and propose technical solutions
• Contributing to and improving automated testing practices
• Participating in peer code reviews and helping maintain high engineering standards
• Using AI-assisted development tools (including the latest LLM models) as part of day-to-day engineering workflows

Tech Stack

You’ll primarily be working with:

• TypeScript (Node.js & React)
• Monorepo tooling, GitHub, GitHub Actions
• Jest, Playwright
• Redis, MS SQL, WebSockets
• Docker, Kubernetes
• Observability tooling (Grafana, Prometheus, SonarQube)

Requirements

• 8+ years of professional software development experience
• 3+ years hands-on TypeScript experience, including Node.js and React
• Strong experience building and maintaining production-grade systems
• Comfortable working within a senior, autonomous engineering team
• Excellent communication skills and fluent English
• Able to work hybrid from Waterloo, London

Nice to Have

• Experience with functional programming concepts or languages (e.g. OCaml, Haskell)
• Previous experience in trading, finance, or other real-time systems
• Good understanding of DevOps and operational practices (logging, metrics, automation)
• London-based
• Willingness to attend occasional company or client events

Benefits

• 5 days per year dedicated to training
• £1,000 annual training allowance (up to 50% usable for home workstation equipment)
• Company equipment and onboarding kit
• Quarterly in-person team events
• Annual performance bonus
• Stock option plan
• Birthday off
• Generous employee referral programme