Senior Mobile Engineer
New Today
Relay is fundamentally reshaping how goods move in an online era. Backed by Europe’s largest-ever logistics Series A ($35M), led by deep-tech investors Plural, Relay is scaling faster than 99.98% of venture-backed startups.
Relay’s Mission is to free commerce from friction. Today, high delivery costs act as a hidden tax on e-commerce, quietly shaping what can be sold online and limiting who can participate. We envision a world where more goods move more freely between more people, making the online shopping experience seamless and accessible to everyone.
THE TEAM
- ~90 people, more than half in engineering, product and data
- 45+ advanced degrees across computer science, mathematics and operations research
- Thousands of data points captured, calculated, analysed and predicted for every single parcel we handle
- An intellectually vibrant culture of first‑principles thinking, tight feedback loops and relentless experimentation
Work Alongside Industry Leaders
Rob Ladbrook – Director of Engineering, renowned for building ultra-low-latency, fault-tolerant systems at global scale. At Relay, Rob champions innovation, consistently seeking and supporting new ideas that redefine what's possible.
Tech Stack Highlights
- Cross-platform Flutter apps with a deep focus on user experience
- Python, Rust and TypeScript - we keep things simple but use the right tool for the job
- Cloud-native on GCP with extensive use of BigQuery and Cloud Run
- Extensive use of ML modelling and LLM inference - no gimmicks here, this is our daily routine
- Emerging tech integrations, including robotics and IoT-powered operations
What You'll Do
- Work across the full stack of technology, from mobile all the way down through data infrastructure.
- Take end-to-end ownership over thorny real-world problems, like using machine vision to automatically assess proof of delivery photos.
- Collaborate with team members across the company.
- Regularly spend time in the field learning how the technology you build impacts our couriers and parcel recipients.
Fast and Focused Hiring Process
- Talent Acquisition Interview - 30 min
- Build a UI Component Interview - 1 hour
- Design and Mobile Fundamentals Interview + AI Programming (Build an APP) - 2 hours
- Operating Principles & Impact - 1 hour
- Decision and offer within 48 hours, our process mirrors our pace of work, typically completed in a week.
Who Thrives at Relay?
- Aim with Precision: You define problems clearly and measure your impact meticulously.
- Play to Win: You chase bold bets, tackle the hard stuff, and view constraints as fuel, not friction.
- 1% Better Every Day: You believe that small, consistent improvements lead to exponential growth. You move quickly, deliver results, and learn from every experience.
- All In, All the Time: You show up and step up. You take ownership from start to finish and do what it takes to deliver when it counts.
- People-Powered Greatness: You invest in your teammates. You give and receive feedback with care and candour. You build trust through high standards and shared success.
- Grow the Whole Pie: You seek out win-win solutions for merchants, couriers, and our customers, because when they thrive, so do we.
Compensation, Benefits & Workplace
- Generous equity, richer than 99% of European startups, with annual top-ups to share Relay’s success.
- Private health & dental coverage, so comprehensive you’d need to be a partner at a Magic Circle law firm to match it.
- 25 days of holidays
- Enhanced parental leave.
- Hardware of your choice.
- Extensive perks (gym subsidies, cycle-to-work, Friday office lunch, covered Uber home and dinner for late nights, and more).
- Located in Shoreditch, our office set-up enables the kind of in-person interactions that drive impact. We work 4 days on-site, with 1 day remote.
Relay is an equal-opportunity employer committed to diversity, inclusion, and fostering a workplace where everyone thrives.
- Location:
- City Of London, England, United Kingdom
- Salary:
- £80,000 - £100,000
- Job Type:
- FullTime
- Category:
- IT & Technology
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