Full Stack Engineer / Technical Lead - London

Salary: £40,000 - 70,000 per year

Requirements

• We are looking for a senior software engineer with experience building developer tooling and APIs.
• You have strong hands-on experience with Ruby, TypeScript, and React.
• You have experience in a product-focused B2B SaaS environment.
• You have experience making technical decisions that drive projects and raise the bar.
• You are comfortable with AI tools such as Claude and Cursor and understand how they can be used to optimise processes.
• You are customer- and product-focused.
• You are collaborative and pragmatic, with experience technically leading and mentoring others.
• You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, and Design Patterns.

Responsibilities

• We own the technical strategy and architecture for one or more Developer Ecosystems, including iOS, Web, and Infra/Automation.
• We define and drive best practices for API and SDK design, ensuring consistency, usability, and scalability.
• We lead complex, cross-team initiatives to expand and improve client libraries.
• We oversee the full development lifecycle from design through release, maintenance, and product evolution.
• We mentor more junior engineers and review contributions, raising the technical bar across the team.
• We guide and manage external contributors and open-source collaboration.
• We act as a key interface with the developer community and incorporate feedback into product direction.

Technologies

• AI
• API
• Cursor
• Support
• OOP
• React
• Ruby
• Serverless
• TypeScript
• Web
• iOS
• Slack
• Fullstack

More

We are a highly regarded provider of serverless real-time infrastructure for the internet, processing billions of messages a day and powering everything from live chat and VoIP calls to real-time pricing and stock availability for services around the globe. This is a London / remote role, with the flexibility to work from home most of the time and meet our dog-friendly North London office around once a month for tech talks, lunch and learn events, and team collaboration. We offer a competitive salary up to 130k, EMI share option scheme, 28 days annual leave, enhanced maternity and parental leave, your choice of kit and home-station setup, a personal learning and development budget of 1000 p/a plus 5% time for your own projects, BUPA health insurance with dental and mental health support, pension, life assurance, income protection, a fully paid one-month sabbatical after five years service, gym subsidies, cycle-to-work scheme, and more.

last updated 34 week of 2026