Software Engineer, Modelling; Mid​/Senior Runna

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 are looking for talented, creative and positive team players to join our highly-skilled

Cross-Functional Engineering Teamto 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

If you don’t quite meet all of the below skills, we’d still love to hear from you as we might be able to tweak the role slightly or offer you a position better suited for you.

• Strong 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)
• Able to understand and apply complex numerical concepts e.g. such as in an analytical degree (Computer Science, Maths, Physics, Engineering)
• Testing modelling-focused software to ensure quality and maintainability
• Deeply analytical and rigorous with a commitment to producing high-quality output
• A pragmatic mindset, with strong communication and collaboration skills
• Confidence in working with a highly skilled engineering team in a fast-paced, iterative environment
• Are confident 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

• Are experienced in deployment, release cycles or CI/CD
• Are comfortable delivering features end-to-end, from architecture design and building through to releasing, testing and supporting
• Have experience monitoring models and algorithms in production
• Have experience with Serverless architectures
• Have experience with AWS
• Have open-source contributions
• Are experienced in delivering features full-stack
• Exposure to, and understanding of, Data Science and Machine Learning
• Have a strong interest in the health/fitness technologies

• Flexible working (we typically work 2-3 days in our office in Vauxhall)
• Salary reviews every 6 months or whenever we raise more investment
• 25 days of holiday plus bank holidays
• A workplace pension scheme where if you pay 5% we pay 3%
• A brand new Macbook, a running watch of your choice, and anything else you need to do your best work
• Private health insurance
• Enhanced family care policy (3 months fully paid leave when a new Runna joins the family, fertility support & other benefits)
• An hour slot each week (during work time) to do a Runna workout