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.

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Location:
City Of London, England, United Kingdom
Salary:
£80,000 - £100,000
Job Type:
FullTime
Category:
IT & Technology

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