We're putting together a talented team to build the #1 training platform for Runners

We help everyday runners become outstanding by providing world-class training, coaching and community for everyone, whether you're improving your 5k time or training for your first marathon. To date we have built iOS, Android and Apple watch apps that help people achieve their goals by coaching them through the full journey and syncing to their favourite fitness devices.

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 2024 iPhone App of the Year, reflecting the innovation and impact of what we’ve built & now in 2025 we have ****just been acquired by Strava! 🤯 🎉

We want to grow as fast as we can into the future and are looking for individuals who will help us get there. Our aim is to reach millions of subscribers and be the go-to training platform for any runner. Now is a magical time to join and with our recent acquisition it makes the journey even more exciting! 🚀

Who we’re looking for

We are looking for talented, creative and positive team players to join our highly-skilled Cross-Functional Engineering Team to help build the next generation running engine that powers what we do. As part of this work, you’ll be working closely with the engineering, product and coaching team to build an engine that will dynamically build users the optimal training plan, whilst adapting based on external inputs (from previous workouts to live recovery tracking). You will work closely with our founders and CTO to help shape the future of Runna who will be there to support you all the way along this exciting journey.

For this role, we are looking for a Mid (L3) to Senior (L4) Modelling Engineer!

As a Modelling Engineer your role will include:

• Architect, build, test and deliver new and improved running engine features to generate personalised, adaptive training plans for many thousands of active users
• Consistently experiment to improve the engine with new algorithms and optimisations
• Collaborate with coaches to best deliver their expertise to users
• Use a data-led approach to influence algorithms
• Designing and implementing tests to ensure consistency and accuracy of plans

What experience we’re looking for

We encourage applications from individuals with a range of experiences and backgrounds. Even if you don’t meet every qualification listed, we’d love to hear from you and are open to tailoring roles to fit the right candidates. Please apply directly below or contact us for more information and to discuss your fit.

Your key skills:

• Proficiency in Python (object orientated) programming, with experience writing production quality code in large python projects
• Designing and implementing complex algorithms (e.g. how should I schedule exercises in someone’s week)
• Comfortable with quantitative methods and approaches to solving problems, gained through various experiences or studies (e.g., Computer Science, Mathematics, Physics, Engineering degree or equivalent practical experience).
• Testing modelling focused software to ensure quality and maintainability
• Analytical and detail-oriented, with a commitment to producing high-quality work
• A pragmatic mindset, with excellent communication and collaboration skills
• Able to work within a highly-skilled engineering team in a fast-paced, iterative environment