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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer I (Growth) - **Company:** Runna - **Location:** Greater London, UK - **Experience:** Expert - **Salary:** £70,000.0 - £78,000.0 - **Contract:** Permanent contract - **Skills:** Apple Watch, JavaScript (Programming Language), A/B Testing, Amazon Web Services, Amazon S3, App Store (IOS), Automation of Tests, Continuous Delivery, Continuous Integration, Amazon DynamoDB, Github, Iterative and Incremental Development, Python (Programming Language), Node.Js, Pair Programming, Mixpanel, Next.js, Amazon Simple Notification Service (SNS), TypeScript, Google Tag Manager, Swiftui, Snowflake, AWS Lambda, AWS AppSync, Backend, Servicebus, Kotlin, Sentry, Graphql, React Native, Front End Software Development, Amazon Simple Queue Service (SQS), Serverless Computing - **Published:** September 10, 2026 - **Apply:** https://www.collegerecruiter.com/job/2840576843-senior-software-engineer-i-growth ## About the Role * 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., * 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. ## Description We're looking for a talented, curious and experimentation minded Senior Full Stack Engineer to join Growth Engineering team. This team owns key parts of the user journey into Runna, working across web and app to create high quality experiences that turn first time visitors into longterm, engaged subscribers. You'll collaborate closely with product, design and data partners, as well as our founders and CTO, to shape how new users first discover and experience Runna., * 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., * React Native (iOS and Android) * Typescript * GraphQL (Apollo Client) * Fastlane * SwiftUI (Apple Watch) * Maestro E2E tests Backend: * Serverless (AWS) * Lambdas (NodeJS & 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 ## Related Videos - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [From Doubt to Confidence: How Sentry Uses Verdaccio to Bulletproof SDK Releases](https://www.wearedevelopers.com/videos/739-from-doubt-to-confidence-how-sentry-uses-verdaccio-to-bulletproof-sdk-releases) - [Navigating Growth, Scaling Challenges, and Office Expansions with David Singleton, CTO at Stripe](https://www.wearedevelopers.com/videos/100362-navigating-growth-scaling-challenges-and-office-expansions-with-david-singleton-cto-at-stripe) - [Bringing AI Model Testing and Prompt Management to Your Codebase with GitHub Models](https://www.wearedevelopers.com/videos/1536-bringing-ai-model-testing-and-prompt-management-to-your-codebase-with-github-models) ## Related Articles - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [Dev Digest 118 - not a total recall](https://www.wearedevelopers.com/magazine/452-dev-digest-118-not-a-total-recall) - [Dev Digest 119 - ❤️ === ❤️](https://www.wearedevelopers.com/magazine/454-dev-digest-119)