Full Stack Staff Engineer

TN United Kingdom; London; Hybrid; GBP 42,000 - 95,000; Full time

Job summary

Join an innovative firm dedicated to transforming the running experience through technology. As a Staff Level Full-Stack Engineer, you will play a crucial role in shaping the future of a leading training platform for runners. Collaborate with a talented team to deliver exceptional mobile applications that empower users to achieve their fitness goals. With a dynamic work environment and a commitment to professional growth, this is an exciting opportunity to make a significant impact in a fast-growing company. Your expertise will help drive architectural direction and ensure engineering excellence, all while enjoying a flexible work culture and competitive benefits.

Benefits

Flexible working

Private health insurance

25 days of holiday plus bank holidays

New MacBook and running watch

£300 desk setup budget

Enhanced family care policy

Weekly workout time during work hours

Qualifications

• 5+ years of experience in software engineering with a focus on mobile applications.
• Proven track record of leading architecture and delivery of large-scale applications.

Responsibilities

• Lead architectural design and technical strategy across multiple product teams.
• Mentor engineers, providing technical guidance and promoting best practices.

Skills

React Native

AWS

CI/CD

Technical Leadership

Problem Solving

SwiftUI

Infrastructure as Code

Education

Bachelor's Degree in Computer Science

Relevant Technical Certifications

Tools

GitHub Actions

Postman

DynamoDB

Sentry

Job description

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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 favorite fitness devices.

We’re growing extremely fast. In November 2023, we closed a new $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. We want to grow as fast as we can into the future and are looking for individuals who will help us get there. For more about our background and growth, check out our Careers Page!

We’re now looking ahead to the future and the people who want to help us build and scale Runna. Our aim is to reach millions of subscribers in the next 5 years and be the go-to training platform for any runner. Now is a magical time to join; we're still small, and everyone makes a foundational difference.

Requirements

Who we’re looking for

We’re looking for a Staff Level Full-Stack Engineer to play a pivotal role in driving the technical success of Runna. This is a hands-on leadership role where you’ll work across four cross-functional product teams, providing architectural direction, ensuring engineering excellence, and enabling the successful delivery of features across our iOS (React Native), Android (React Native), and Apple Watch apps, as well as third-party integrations (Garmin, Strava, Coros, Fitbit, Suunto, etc).

You’ll partner closely with our CTO and founders, as well as product and design leads, to align technical strategy with company goals. You’ll be a multiplier for the engineering team—mentoring developers, improving processes, and guiding the evolution of our systems as we scale. We’re looking for someone who is not only technically excellent but also a creative problem solver and collaborative leader who brings energy and clarity to fast-paced environments.

As a Staff Level Full-Stack Engineer, your role will include:

• Lead the architectural design and technical strategy across multiple product teams, ensuring scalable, secure, and maintainable solutions.
• Drive the end-to-end delivery of key initiatives, working hands-on to build, test, and ship features across the full stack (mobile, backend, integrations).
• Collaborate with Product, Design, and Engineering Leads to define the best solutions for user experience, balancing speed, quality, and long-term technical goals.
• Mentor and support engineers across teams, providing technical guidance, code reviews, and promoting engineering best practices.
• Champion developer productivity by improving our CI/CD pipeline, tooling, and internal workflows to accelerate delivery and reduce friction.
• Own the release process and support a culture of reliable, continuous deployment—while enabling teams to ship confidently and independently.

What experience we’re looking for

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. You can apply directly below or contact us if you’re still unsure.

• Proven track record of leading the architecture and successful delivery of large-scale React Native mobile applications in a production environment.
• Experience working in AWS cloud environments, with a strong preference for familiarity with Serverless architectures (e.g., Lambda, API Gateway, DynamoDB, AppSync).
• Able to thrive in a highly skilled, fast-paced engineering team. In 2024, we shipped:
• 99 mobile app releases (iOS and Android)
• 443 API releases
• 237 backend modeling releases
• 5+ years of professional experience in software engineering, with a focus on technical leadership and driving projects end-to-end.
• Comfortable stepping outside your core expertise to solve problems across the stack, from frontend to cloud infrastructure.
• Skilled in defining and delivering features from initial architecture and design through to release, testing, and production support.
• A strong advocate for modern engineering practices, including:
• Iterative development, continuous deployment, and test automation
• Shared code ownership and working in cross-functional product teams
• Have delivered impactful work across the full stack—from mobile to backend services and cloud infrastructure.
• Have hands-on experience with SwiftUI or native mobile development.
• Are confident working with and improving CI/CD pipelines, release cycles, and deployment processes.
• Have experience with React Native at scale in performance-sensitive or offline-first applications.
• Have deep experience with AWS services and serverless architecture patterns.
• Are comfortable with Infrastructure as Code tooling like Terraform, CDK, or CloudFormation.
• Have contributed to open-source communities—through code, issues, testing, or documentation.
• Have a personal interest in health, fitness, or sports technology.

Check out our Tech Radar here, which we are constantly iterating, and below you can find a small reflection of our current tech stack:

Frontend:

• React Native (iOS and Android)
• Typescript
• Fastlane
• SwiftUI (Apple Watch)
• Serverless (AWS)
• AWS AppSync
• DynamoDB, S3, SQS, SNS, EventBridge, SageMaker
• Postman API tests

All the other good stuff:

• Sentry
• GitHub Actions
• Intercom, Mixpanel
• RevenueCat
• App Store Connect / Play Store

Software Engineer Interview Process

Our aim is to keep the interview process as straightforward and enjoyable as possible, and will consist of the following stages:

• Getting to Know You + Live Coding (45-minute video call, first 25 mins will be an introductory chat followed by two live coding exercises from https://leetcode.com/)
• Take-home technical task (max 1-2 hours to complete, or if you have something interesting you recently built and would like to showcase, then that's perfectly OK)
• 1.5-hour technical interview (the first half of the call will be used to discuss the take-home technical task from the previous stage and the second half will consist of some general architecture/tech questions)
• Meet the team (in-person chat with founder(s) and the rest of the team)

Once the process is finished, we promise to let you know our decision as soon as possible.

Benefits and options

**** Based on years of direct, relevant experience. Software Engineer I £42.5k, Software Engineer II £47.5-60k, Software Engineer III £60-80k, Software Engineer IV £80k-95k, Software Engineer V £95k+**

Overview of our benefits is below:

• 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 brand new MacBook, a running watch of your choice, £300 budget to set up your desk 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

We'll be growing our package of benefits over time! Read full details here.