Staff Full Stack Software Engineer

Runna, a fast-growing company dedicated to helping millions of runners achieve their goals. As a Staff Full Stack Software Engineer, you will play a crucial role in driving the technical success of the platform. You will work across multiple squads, providing architectural direction, ensuring engineering excellence, and enabling the successful delivery of features.

Responsibilities

• This is a hands-on role where you will have the opportunity to champion new technologies, work on meaningful problems, and improve existing architecture.
• You will also mentor developers, improve processes, and guide the evolution of our systems as we scale.
• Lead the architectural design and technical strategy across multiple product teams, ensuring scalable, secure, and maintainable solutions.
• Drive the end-to-end delivery of key initiatives, working hands-on to build, test, and ship features across the full stack (mobile, backend, integrations).
• Coach and support engineers by providing technical guidance, mentorship, and code reviews without creating bottlenecks.
• Skilled in defining and delivering features from initial architecture and design through to release, testing, and production support
• Deep expertise in TypeScript/JavaScript, with a strong foundation across the full stack
• Proven ability to mentor engineers, support team growth, and guide complex projects from design to release
• Familiarity shipping LLM-backed features to production, including prompt and context design, in a user facing product
• 552 modelling backend releases

Requirements

878 API releases

• Able to thrive in a highly skilled, fast-paced engineering team. So far in 2026, we shipped:
• Broad AWS experience across serverless (Lambda, API Gateway, AppSync), containers (ECS/EKS) and managed services, with no strong attachment to one deployment model
• 6+ years of professional experience in software engineering, with a focus on technical leadership and driving projects end-to-end

49 mobile app releases (iOS and Android)

• Able to thrive in autonomous roles, taking ownership without heavy direction
• Comfortable with Infrastructure as Code tooling like Terraform, CDK, or CloudFormation
• Hands-on experience putting AI to work in a real engineering organisation, whether that’s agentic workflows, automated code review, or internal agents. You have a clear view of where it pays off and where it doesn’t
• Have hands-on experience with SwiftUI or native mobile development
• Are confident working with and improving CI/CD pipelines, release cycles, and deployment processes
• Experience working with cross-platform frameworks, such as React Native
• GBP 110,000 - 131,000