IT & Software

Full Stack Engineer / Technical Lead B2B SaaS

Client Server

London · Greater London · United Kingdom

Overview

In this role you will own the technical strategy and architecture for developer ecosystems, driving API and SDK design to ensure usability and scale. You will lead cross-team initiatives to expand client libraries and guide open-source collaboration, while mentoring engineers and shaping product direction. The position blends hands-on development with leadership in a fast-growing, global real-time infrastructure context. Join a collaborative, customer-focused team that values pragmatic engineering and impactful tech decisions.

Pay / Benefits
  • EMI share option scheme
  • 28 days annual leave
  • Enhanced maternity and parental leave
  • Personal learning and development budget
  • BUPA Health Insurance + dental costs
  • Fully paid one month sabbatical at five years
Responsibilities
  • own the technical strategy and architecture for Developer Ecosystems (iOS, Web, Infra/Automation)
  • define and drive best practices for API and SDK design ensuring consistency and scalability
  • lead complex cross-team initiatives to expand client libraries
  • oversee the full development lifecycle from design to release and maintenance
  • mentor junior engineers and review contributions to raise the technical bar
  • guide external contributors and open-source collaboration
  • act as a key interface with the developer community and incorporate feedback into product direction
Key requirements
  • senior software engineer with experience building developer tooling and APIs
  • strong hands-on experience with Ruby, TypeScript and React
  • experience in product-focused B2B SaaS environments
  • ability to make technical decisions that drive projects and raise the bar
  • familiar with AI tools such as Claude and Cursor and their process-optimising potential
  • customer and product focused
  • collaborative and pragmatic with mentoring experience
  • solid understanding of CS fundamentals (OOP, data structures, design patterns)
  • collaborative
  • customer-focused
  • mentoring and coaching
  • Ruby
  • TypeScript
  • React

Reference: WJ-747_30933984

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