Full Stack Engineer / Technical Lead B2B SaaS

Overview

As a Full Stack Engineer / Technical Lead, you will shape the technical strategy and architecture for Developer Ecosystems, guiding API and SDK design for scalable, usable tooling. You’ll lead cross-team initiatives to expand client libraries, oversee the full lifecycle from design to release, and mentor engineers while engaging with external contributors and the developer community. The role combines hands-on coding with leadership, influencing product direction and technical standards. This is a chance to influence how developers interact with a high-scale real-time platform.

Pay / Benefits

• EMI share option scheme
• 28 days annual leave
• Enhanced maternity and parental leave packages
• Personal learning and development budget (1000 p/a + 5% time to work on your own projects)
• BUPA Health Insurance + dental costs + mental health and wellness
• Pension, Life Assurance, Income Protection

Responsibilities

• Define and drive the technical strategy and architecture for Developer Ecosystems (iOS, Web, Infra/Automation)
• Establish and enforce API and SDK design best practices for consistency and scalability
• Lead complex, cross-team initiatives to expand client libraries
• Oversee full development lifecycle from design to release, maintenance and evolution
• Mentor junior engineers, review contributions, raise technical standards
• Guide external contributors and open-source collaboration
• Act as a main 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 a product-focused B2B SaaS environment
• Track record of making technical decisions that drive projects and raise the bar
• Comfort with AI tools such as Claude and Cursor and understanding of their use to optimise processes
• Customer and product-focused mindset
• Collaborative and pragmatic with mentoring experience
• Solid CS fundamentals (OOP, Data Structures, Design Patterns)

• collaborative
• pragmatic
• customer-focused
• Ruby
• TypeScript
• React