Lead Software Engineer (Ruby, TypeScript, React)

Salary: £100,000 - 100,000 per year

Requirements

• Senior software engineer experience in building developer tooling and APIs
• Strong hands-on expertise in Ruby, TypeScript, and React
• Experience within a product-focused B2B SaaS environment
• Proven ability to make technical decisions that enhance projects and elevate standards
• Familiarity with AI tools like Claude and Cursor to optimize processes
• Customer and product-focused mindset
• Collaborative and pragmatic, with experience in leading and mentoring others
• Thorough understanding of Computer Science fundamentals such as OOP, Data Structures, and Design Patterns

Responsibilities

• Own the technical strategy and architecture for one or more Developer Ecosystems (iOS, Web, Infra/Automation)
• Define and drive best practices for API and SDK design, ensuring consistency, usability, and scalability
• Lead complex, cross-team initiatives to improve client libraries
• Oversee the full development lifecycle, from design through to release, maintenance, and product evolution
• Mentor junior engineers and review their contributions to elevate the teams technical standards
• Guide and manage external contributors and open-source collaboration
• Act as a key interface with the developer community, incorporating feedback into product direction

Technologies

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

More

We are a highly regarded provider of serverless real-time infrastructure for the Internet, processing billions of messages daily. Our team offers a collaborative work environment, where most of the time you can work remotely, joining us in our dog-friendly North London office for tech talks and lunch and learn events once a month. As a Lead Software Engineer, you will enjoy a competitive salary package up to £130k, EMI share option scheme, well-being benefits, personal development opportunities, and more. At Client Server, we value diversity and are committed to fostering an inclusive workplace.

last updated 17 week of 2026