Senior Software Engineer I (Growth) at Runna in Runna London

Job description

• Application
• 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. 🚀

Responsibilities

• Architect, build, test and ship high impact user journeys and subscription funnels, focusing on turning curious visitors into engaged subscribers.
• Design and run experiments across web and app - onboarding flows, paywalls, plan discovery - to improve conversion at every step.
• Work closely with Product, Design and Data to help prioritise opportunities, define success metrics and make decisions grounded in experiment results.
• Collaborate across teams to ensure users have a smooth, consistent experience as they move between products and platforms.
• Implement and maintain instrumentation, tracking and tooling so we can understand behaviour, spot issues quickly and measure impact.
• Own features end-to-end: from early discovery and technical design through to implementation, rollout, monitoring and iteration.
• Contribute to our developer experience by improving CI/CD, testing and release workflows so the team can ship and learn quickly.

Requirements

• We're looking for people who are strong in some of these areas, not necessarily all of them. If this role excites you, please apply.
• Solid TypeScript / JavaScript experience.
• Experience building user-facing product surfaces where conversion and UX really matter — onboarding, paywalls, landing pages, growth loops, etc.
• React experience (React Native is a bonus, not a requirement).
• 2+ years of full stack experience — we value full stack experience more than depth in just one layer.
• Comfortable working in a fast paced, iterative environment with lots of experimentation and learning from data.
• Able to deliver features end-to-end: from architecture through to rollout, measurement and iteration.
• Curious about what didn't work as much as what did.
• Experience with Swift or Kotlin for mobile.
• Experience working on growth, experimentation, or funnel optimisation teams.
• Experience with analytics and experimentation tooling (A/B tests, feature flags, etc).

Skills

Required

• TypeScript
• JavaScript
• React
• Full stack development
• User-facing product development
• Experimentation
• Data-driven decision making
• End-to-end feature delivery
• CI/CD
• Testing
• Release workflows

Preferred

• React Native
• Swift
• Kotlin
• Growth engineering
• Experimentation tooling
• Analytics tooling
• A/B testing
• Feature flags

Benefits

• This range reflects base compensation only and does not include equity or benefits. Your recruiter can share more details about the full compensation package during the hiring process.
• At Runna, we know our employees are the most important ingredient to our success, and our compensation and total rewards programs reflect that. We take a market-based approach to pay, and pay may vary depending on the department and your location. Salary ranges are categorized into one of three zones based on a cost of labor index for that geographic area. We will determine the candidate’s starting pay based on job-related skills, experience, qualifications, work location, and market conditions. We may modify these ranges in the future.
• For more information, please contact your talent partner.
• We’re offering a salary of £70,00-£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 🇬🇧
• 💪 Flexible working — typically 3 days a week in our Vauxhall office, with flexibility around life commitments.
• 🏝️ 25 days holiday plus bank holidays.
• 🏥 Private health insurance (Bupa) and workplace pension scheme.
• 📚 Modern Health — mental wellness platform combining therapy, coaching and self guided programmes.
• 🥕 Carrot Fertility — inclusive fertility, hormonal health and family forming support. We want everyone to feel supported in building their family, whatever that looks like.
• 😌 Headspace membership for mindfulness and sleep.
• 💵 Annual budget for gear, events and gym.
• 💳 Free Runna and Strava subscriptions for you and 3 friends.
• Please see more info on our amazing benefits here: Benefits at Runna