Senior Software Engineer

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 Jam Jar 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. 🚀

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.

• Strong Type Script/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.

Frontend:

• React…