Senior Full Stack Engineer II (Contract)

Runna

We're putting together a talented team to build the #1 training platform for Runners 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. We’re growing extremely fast! In November 2023 we closed a $6.5M funding round led by JamJar with participation from Eka Ventures, Venrex and Creator Ventures. In 2024, we were selected by Apple as one of three global finalists for the iPhone app of the year, reflecting the innovation and impact of what we’ve built & in 2025 we were acquired by Strava! Our ambition is huge: to become the go-to global leading training platform for millions of runners everywhere. We’re growing with purpose and looking for people who want to build something meaningful with lasting impact. With the recent acquisition by Strava accelerating our journey, now is a really magical time to join. 🚀 THE TEAM YOU’LL JOIN We are looking for talented, creative and positive team players to join our highly-skilled cross-functional engineering team. You’ll sit in our recently formed Strength Team, where you will collaborate with our modelling engineers, as well as Team Strava, to build the next generation of strength training and redefine how athletes train. You will work closely with our CTO, and engineering leadership team to help shape the future of Runna, who will support you all along this exciting journey. We have a jam packed roadmap, with countless opportunities to champion new technologies, work on meaningful problems that impact millions of athletes, and improve existing architecture to elevate the whole of our engineering team. WHAT YOU’LL BE DOING * Architecting, building, testing and delivering new features across the full stack * Working with the Product team to identify the most suitable solution for the best customer experience * Collaborating with modelling/AI engineers to design architecture used to interface between the Runna training engine and Runna app * Always be on hand to help other team members when they need help on technical matters * Coach and support engineers in your team, providing guidance, mentorship, and code reviews without creating bottlenecks. * Help us operate more efficiently, by building and maintaining our developer tooling and CI/CD pipeline * We rotate the responsibility of releases across each team member, so you will get the opportunity to lead the process and deploy changes to production * Impacting the wider engineering team by championing new technologies and setting standards for engineering quality WHAT YOU’LL BRING TO THE TEAM: * Proficiency working with TypeScript/JavaScript * Experience with the technologies in our stack: * React Native (worked on large scale applications) * Native mobile development (Swift, Kotlin) * Cloud platforms, particularly AWS * Able to work in a highly skilled engineering team in a fast-paced, iterative environment. * 4+ years experience in your main expertise area (Frontend, Backend etc) * Comfortable picking up new things and working on technologies outside your comfort zone * Are skilled in delivering features end-to-end, from architecture design and building through to releasing, testing and supporting * Enthusiasm for our ways of working which include: * Iterative development, continuous deployment and test automation * Knowledge sharing, pair programming, collaborative design & development * Shared code ownership & cross-functional teams BONUS POINTS IF YOU HAVE: * Are experienced in deployment, releasing cycles or CI/CD * Have experience with Serverless architectures * Experience with Terraform or other IaC tooling (e.g. CDK, CloudFormation, etc.) * Have experience in open source contributions, including reporting bugs/issues in GitHub, testing new releases, or contributing to code COMPENSATION OVERVIEW & BENEFITS We’re offering a salary of £85,000 - £95,000 per year, depending on experience, plus participation in Strava's long-term incentive (stock) programs. Overview of our benefits are below: We’re also committed to continually evolving our benefits to support you as we grow. Here is a brief overview what we currently offer in the UK 🇬🇧 1. 🏢 Flexible working – we typically spend 3 days a week together in our Vauxhall office 2. 🏝️ 25 days holiday, plus bank holidays 3. 📱Free Runna & Strava subscriptions for you and 3 of your friends (get ready to be your friends fave person or save them for holiday presents!) 4. 🧘 Headspace membership 5. 💸 Money every year to spend on gear, events and the gym! 6. 🏥 Private health insurance with Bupa and workplace pension scheme 7. 💖Modern Health is a mental wellness platform and app that combines technology with professional support to improve mental well-being and reduce stress 8. 🥕Carrot fertility support - this benefits provider can provide inclusive fertility, hormonal health, and family-forming benefits to our global employee population and takes the burden off what we know can be a stressful process. Please let us know if there’s anything we can do to better accommodate you throughout the interview process - this can be from scheduling interviews around childcare commitments to accessibility requirements. We want you to show your best self in the process, so please speak to your Talent Partner!

Runna

We're putting together a talented team to build the #1 training platform for Runners 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. We’re growing extremely fast! In November 2023 we closed a $6.5M funding round led by JamJar with participation from Eka Ventures, Venrex and Creator Ventures. In 2024, we were selected by Apple as one of three global finalists for the iPhone app of the year, reflecting the innovation and impact of what we’ve built & in 2025 we were acquired by Strava! Our ambition is huge: to become the go-to global leading training platform for millions of runners everywhere. We’re growing with purpose and looking for people who want to build something meaningful with lasting impact. With the recent acquisition by Strava accelerating our journey, now is a really magical time to join. 🚀 THE TEAM YOU’LL JOIN We are looking for talented, creative and positive team players to join our highly-skilled cross-functional engineering team. You’ll sit on the Train Team where you will work closely with our modelling teams to integrate features that are core to Runna’s mission (think adapting plans around holidays and B races, supporting new cutting edge plans, and building in-app experiences around our AI/ML tooling). You will work closely with our CTO, and engineering leadership team to help shape the future of Runna, who will support you all along this exciting journey. We have a jam packed roadmap, with countless opportunities to champion new technologies, work on meaningful problems that impact millions of runners, and improve existing architecture to elevate the whole of our engineering team. WHAT YOU’LL BE DOING * Architecting, building, testing and delivering new features across the full stack * Working with the Product team to identify the most suitable solution for the best customer experience * Collaborating with modelling/AI engineers to design architecture used to interface between the Runna training engine and Runna app * Always be on hand to help other team members when they need help on technical matters * Coach and support engineers in your team, providing guidance, mentorship, and code reviews without creating bottlenecks. * Help us operate more efficiently, by building and maintaining our developer tooling and CI/CD pipeline * We rotate the responsibility of releases across each team member, so you will get the opportunity to lead the process and deploy changes to production * Impacting the wider engineering team by championing new technologies and setting standards for engineering quality WHAT YOU’LL BRING TO THE TEAM: * Very proficient in TypeScript/JavaScript development * Able to work in a highly skilled engineering team in a fast-paced, iterative environment. In 2024 we shipped: * 99 mobile app releases (iOS and Android) * 443 API releases * 237 modelling backend releases * 4+ years experience in your main expertise area (Frontend, Backend etc) * Comfortable picking up new things and working on technologies outside your comfort zone * Are skilled in delivering features end-to-end, from architecture design and building through to releasing, testing and supporting * Enthusiasm for our ways of working which include: * Iterative development, continuous deployment and test automation * Knowledge sharing, pair programming, collaborative design & development * Shared code ownership & cross-functional teams * Have experience with React Native (worked on large scale applications) * Have experience with AWS * Are experienced in delivering features full-stack BONUS POINTS IF YOU HAVE: * Are experienced in SwiftUI * Are experienced in deployment, releasing cycles or CI/CD * Have experience with Serverless architectures * Experience with Terraform or other IaC tooling (e.g. CDK, CloudFormation, etc.) * Have experience in open source contributions, including reporting bugs/issues in GitHub, testing new releases, or contributing to code OUR TECH STACK Below you can find a small reflection of our current tech stack: Frontend: * 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 SALARY AND BENEFITS We’re offering a salary of £85,000-95,000 per year, depending on experience, plus participation in Strava's long-term incentive (stock) programs. Overview of our benefits is below: We’re also committed to continually evolving our benefits to support you as we grow. Here is a brief overview what we currently offer in the UK 🇬🇧 1. 🏢 Flexible working – we typically spend 3 days a week together in our Vauxhall office 2. 🏝️ 25 days holiday, plus bank holidays (which you can take whenever suits you) 3. 📱Free Runna & Strava subscriptions for you and 3 of your friends (get ready to be your friends fave person or save them for holiday presents!) 4. 🧘 Headspace membership 5. 💸 Money every year to spend on gear, events and the gym! 6. 🏥 Private health insurance with Bupa and workplace pension scheme 7. 💖Modern Health is a mental wellness platform and app that combines technology with professional support to improve mental well-being and reduce stress 8. 🥕Carrot fertility support - this benefits provider can provide inclusive fertility, hormonal health, and family-forming benefits to our global employee population and takes the burden off what we know can be a stressful process. Please see more info on our amazing benefits here: Benefits at Runna OUR INTERVIEW PROCESS: Our aim is to keep the interview process as straightforward and enjoyable as possible, and will consist of the following stages: 1. Screening call with Talent team (30 minute video call) 2. Getting to Know You + Live Coding (45-minute video call, first 25 mins will be an introductory chat followed by two live coding exercises from https://leetcode.com/) 3. Take home technical task (max 1-2 hours to complete, or if you have something interesting you recently built and would like to showcase then that's perfectly OK) 4. 1.5-hour technical interview (the first half of the call will be used to discuss the take-home technical task from the previous stage and the second half will consist of system design and some general architecture/tech questions) 5. Meet the team (in-person chat with founder(s) and rest of the team) Please let us know if there’s anything we can do to better accommodate you throughout the interview process - this can be from scheduling interviews around childcare commitments to accessibility requirements. We want you to show your best self in the process, so please speak to your Talent Partner

Runna

We're putting together a talented team to build the #1 training platform for Runners 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. We’re growing extremely fast! In November 2023 we closed a $6.5M funding round led by JamJar with participation from Eka Ventures, Venrex and Creator Ventures. In 2024, we were selected by Apple as one of three global finalists for the iPhone app of the year, reflecting the innovation and impact of what we’ve built & in 2025 we were acquired by Strava! Our ambition is huge: to become the go-to global leading training platform for millions of runners everywhere. We’re growing with purpose and looking for people who want to build something meaningful with lasting impact. With the recent acquisition by Strava accelerating our journey, now is a really magical time to join. 🚀 THE TEAM YOU’LL JOIN We’re looking for a full stack engineer to join our Growth team, with a strong focus on marketing technology. You’ll sit at the intersection of product, data and marketing – building and maintaining the systems that power our acquisition, activation and retention efforts across channels. Although Marketing Technology is a core part of this role, you’ll also spend a significant portion of your time working across full‑stack initiatives in our Growth Product Squad – building features, launching experiments, and iterating based on results. You’ll join our cross-functional Growth squad, working closely with product, marketing and data. The team is responsible for: * Improving how new users discover, try and subscribe to Runna. * Running experiments across the funnel, from ad click through to in‑app activation and ongoing engagement. * Owning the core tools and integrations that power our marketing and lifecycle communications. HOW WE WORK * Cross‑functional, collaborative teams with shared goals. * Iterative development, continuous deployment and a strong focus on testing and observability. * High autonomy, high ownership – you’ll have real responsibility for growth outcomes and the systems that support them. You’ll also collaborate with the wider engineering org to ensure our growth systems are robust, observable and align with our overall architecture and standards. WHAT YOU’LL BE DOING * Own implementation and maintenance of ad tracking SDKs and MMPs (for example TikTok, Meta, Google, AppsFlyer), including event mapping and monitoring for signal loss. * Build and maintain tracking and tag manager setups across web and app so our data is reliable, privacy‑respectful and useful for models and reporting. * Design, build, test and ship full stack features that support growth (for example landing pages, onboarding flows, referral and promo experiences). * Integrate and maintain CRM and lifecycle tooling (for example Iterable or similar), including catalogues, data feeds, deeplinks and email / in‑app templates. * Build internal tools, automations and scripts (for example in Python or Node) that connect systems, improve workflows and power pLTV, dashboards and alerting. * Collaborate closely with Growth, Marketing and Data to scope experiments and quickly ship A/B tests and campaigns that move key metrics. WHAT YOU’LL BRING TO THE TEAM: * Solid experience as a full stack engineer (ideally 3+ years), comfortable working across frontend and backend. * Strong TypeScript/JavaScript skills and experience with modern frontend frameworks (for example React / React Native). * Hands‑on experience integrating and maintaining marketing technology such as: * Analytics and product analytics tools. * Mobile / web attribution. * Tag managers and event tracking. * CRM or lifecycle platforms (email, push, in‑app messaging). * Comfort working closely with non‑engineering partners (marketing, product, data) and translating business goals into technical solutions. * A bias towards experimentation and iteration – you care about impact and learning fast. * Strong ownership mindset: you’re happy to take a problem from idea to shipped, monitored solution. * Good understanding of event tracking, data quality and debugging issues across multiple platforms and tools. BONUS POINTS IF YOU HAVE: * Experience with mobile growth and attribution (for example RevenueCat, app store / play store tooling, mobile attribution providers). * Previous experience in a product‑led or consumer subscription business. * Experience with experimentation platforms and A/B testing. * Familiarity with AWS or another major cloud provider and modern CI/CD practices. * Experience working in or closely with a Growth / Marketing team. OUR TECH STACK Below you can find a small reflection of our current tech stack: FRONTEND: * 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 SALARY AND 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. Overview of our benefits is below: We’re also committed to continually evolving our benefits to support you as we grow. Here is a brief overview what we currently offer in the UK 🇬🇧 1. 🏢 Flexible working – we typically spend 3 days a week together in our Vauxhall office 2. 🏝️ 25 days holiday, plus bank holidays 3. 📱Free Runna & Strava subscriptions for you and 3 of your friends (get ready to be your friends fave person or save them for holiday presents!) 4. 🧘 Headspace membership 5. 💸 Money every year to spend on gear, events and the gym! 6. 🏥 Private health insurance with Bupa and workplace pension scheme 7. 💖Modern Health is a mental wellness platform and app that combines technology with professional support to improve mental well-being and reduce stress 8. 🥕Carrot fertility support - this benefits provider can provide inclusive fertility, hormonal health, and family-forming benefits to our global employee population and takes the burden off what we know can be a stressful process. Please see more info on our amazing benefits here: Benefits at Runna OUR INTERVIEW PROCESS: Our aim is to keep the interview process as straightforward and enjoyable as possible, and will consist of the following stages: 1. Screening call with Talent team (30 minute video call) 2. Getting to Know You + Live Coding (45-minute video call, first 25 mins will be an introductory chat followed by two live coding exercises from https://leetcode.com/) 3. Take home technical task (max 1-2 hours to complete, or if you have something interesting you recently built and would like to showcase then that's perfectly OK) 4. 1.5-hour technical interview (the first half of the call will be used to discuss the take-home technical task from the previous stage and the second half will consist of system design and some general architecture/tech questions) 5. Meet the team (in-person chat with the wider team) Please let us know if there’s anything we can do to better accommodate you throughout the interview process - this can be from scheduling interviews around childcare commitments to accessibility requirements. We want you to show your best self in the process, so please speak to your Talent Partner