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Runna

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.

## Senior Full Stack Engineer II (Contract)

**Location:** Runna London  
**Employment Type:** Contract (6 months)  
**Department:** Technology Engineering

### About the Contract Role

We are looking for talented, creative and positive team players for our highly-skilled cross-functional engineering group on a contract basis. This role will collaborate 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).

### 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 when help is needed on technical matters
- Coaching and supporting engineers, providing guidance, mentorship, and code reviews without creating bottlenecks
- Contribute to us operate more efficiently, by building and maintaining our developer tooling and CI/CD pipeline
- We rotate the responsibility of releases across engineers, so you will get the opportunity to lead the process and deploy changes to production
- Impacting engineering 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

### 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

### Interview Process

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 LeetCode)
3. **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)

Head of People & Talent @ Runna (acq. Strava)

Milly-Louisa Cleal

Head of People & Talent

Senior Full Stack Engineer II (Contract) @ Runna - Jobs

Full Stack Engineer

Contract role for a Senior Full Stack Engineer II at Runna, focusing on building features across the full stack and collaborating with AI/ML teams. 6-month contract based in London.

Jobs

Senior Full Stack Engineer II

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