Senior Software Engineer I (Growth)

Senior Full Stack Engineer – Growth Engineering

We help everyday runners become outstanding by building an incredible app providing world‑class training, coaching and community for everyone, whether you’re improving your 5k time or training for your first marathon.

What you’ll be doing

• Architect, build, test and ship high impact user journeys and subscription funnels, focusing on turning curious visitors into active, engaged subscribers.
• Design and run experiments across web and app (such as onboarding flows, paywalls, and plan discovery experiences) to improve conversion at each step of the journey.
• Work closely with Product, Design and Data to prioritise opportunities, define clear success metrics and make decisions grounded in experiment results.
• Collaborate with other teams to ensure users have a smooth, consistent experience as they move between different products and platforms.
• Implement and maintain the instrumentation, tracking and tooling needed so we can understand behaviour, spot issues quickly and measure impact with confidence.
• Own features end‑to‑end: from early discovery and technical design through implementation, rollout, monitoring and iterative improvements.
• Contribute to our developer experience by improving CI/CD, testing and release workflows, enabling the team to ship and learn quickly.

What you’ll bring to the team

• Strong TypeScript/JavaScript experience.
• Experience building user‑facing product surfaces where conversion and UX really matter (onboarding, paywalls, landing pages, growth loops, etc).
• Comfortable working in a fast‑paced, iterative environment with lots of experimentation and learning from data.
• 2+ years experience in your main expertise area (frontend, backend or full‑stack).
• Skilled at delivering features end‑to‑end: from architecture and implementation through to rollout, measurement and iteration.
• You enjoy learning from experiments, and are as interested in what did not work as in the wins.
• Enthusiasm for our ways of working:
  • Iterative development, continuous deployment and test automation.
  • Knowledge sharing, pair programming and collaborative design.
  • Shared ownership of code and outcomes across cross‑functional teams.
• Experience working full‑stack, or a strong interest in stretching across the stack.

Bonus points if you have

• Experience with Swift or Kotlin for mobile, or Next.js for web experiences.
• Experience working on growth, experimentation, or funnel optimisation teams.
• Experience with analytics and experimentation tooling to support A/B tests.

Our Tech Stack

Frontend

• React Native (iOS and Android)
• TypeScript
• GraphQL (Apollo Client)
• Fastlane
• SwiftUI (Apple Watch)
• Maestro E2E tests

Backend

• Serverless (AWS)
• Lambdas (Node.js & Python)
• AWS AppSync
• DynamoDB, S3, SQS, SNS, EventBridge, SageMaker
• Snowflake

All The Other Good Stuff

• Sentry
• GitHub Actions
• Intercom, Mixpanel
• RevenueCat
• App Store Connect / Play Store
• Google Tag Manager

Salary & Benefits

We’re offering a salary of £70,000–£78,000 per year, depending on experience, plus participation in Strava’s long‑term incentive (stock) programs.

Benefits in the UK include:

• Flexible working – we typically spend 3 days a week together in our Vauxhall office
• 25 days holiday, plus bank holidays
• Free Runna & Strava subscriptions for you and 3 of your friends
• Strava membership
• Headspace membership
• Annual money allowance to spend on gear, events and the gym
• Voucher to spend on our website, renewed yearly on your work anniversary
• Private health insurance with Bupa and workplace pension scheme
• Modern Health – a mental wellness platform and app that combines technology with professional support to improve mental well‑being and reduce stress
• Carrot fertility support – inclusive fertility, hormonal health and family‑forming benefits

Interview Process

• Screening call with Talent team (30 minute video call)
• Getting to Know You + Live Coding (45‑minute video call, first 25 mins introductory chat followed by two live coding exercises from leetcode.com)
• Take‑home technical task (max 1–2 hours to complete, or showcase recent work if applicable)
• 1.5‑hour technical interview: first half to discuss the take‑home task, second half system design and general architecture/tech questions
• Meet the team (in‑person chat with founder(s) and rest of the team)

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