Senior Software Engineer I (Full-Stack)

About the role

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 https://www.strava.com/about?hl=en-GB!

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. 🚀

WHO WE'RE LOOKING FOR

We're looking for a talented, high-quality full-stack engineer to join our team.

We care about how well you build software, how you work within a team, and how fast you learn. Runna's stack and problems will keep changing as we grow, so we're looking for strong engineers who pick up new systems quickly and bring good judgement wherever they land, not a checklist match against today's tech.

You'll work closely with your Engineering Manager and a cross-functional squad - product, design and fellow engineers - as well as colleagues across Strava. Wherever you land, the goal is the same: helping Runna become the most trusted training platform for runners everywhere.

We follow a flexible hybrid model that translates to more than half of your time on-site - 3 days per week in Runna's office based in London, UK.

WHAT YOU'LL BE DOING

- Architect, build, test and deliver features and reliability improvements across the full stack, from our mobile apps through to the systems behind them

- Take ownership of problems end-to-end, from design through build, release, testing and support

- Work closely with Product and Design to find the most reliable and intuitive solution to the problem in front of you

- Help evolve our developer tooling, CI/CD pipeline and engineering standards, and take your turn in the team's release rotation

- Be on hand to support teammates on tricky technical problems, wherever they sit in the stack

- As you settle in, you'll could dig into things like our recording and sync pipeline, third-party wearable integrations, or interfacing with modelling engineers on plan adaptations - the specifics will evolve with our roadmap and your strengths, so treat this as a flavour of the work rather than a fixed brief

REQUIREMENTS

If you don't tick every box below, please apply anyway. Research shows that strong candidates can rule themselves out over a partial match even when they'd do the job well. If you're a strong full-stack engineer keen to learn, we'd rather hear from you than not, and we're happy to talk about whether a different role or level might be a better fit.