Senior Mobile Engineer

<p style="min-height:1.5em"><strong>Relay is fundamentally reshaping how goods move in an online era.</strong> Backed by Europe’s largest-ever logistics Series A ($35M), led by deep-tech investors Plural (whose portfolio spans fusion energy and space exploration), Relay is scaling faster than 99.98% of venture-backed startups. We're assembling the most talent-dense team the logistics industry has ever seen</p><p style="min-height:1.5em"><strong>Relay’s Mission is</strong> to <strong>free commerce from friction</strong>. 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 <strong>more goods move more freely between more people</strong>, making the online shopping experience seamless and accessible to everyone.</p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>THE TEAM<br /></strong>• <strong>~110 people</strong>, more than <strong>half</strong> in engineering, product and data<br />• <strong>45+ advanced degrees</strong> across computer science, mathematics and operations research<br />• <strong>Thousands</strong> of data points captured, calculated, analysed and predicted for every single parcel we handle<br />• An intellectually vibrant culture of <strong>first‑principles thinking</strong>, tight feedback loops and relentless experimentation</p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>Work Alongside Industry Leaders</strong></p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>Diego Protas – Director of Engineering</strong></p><p style="min-height:1.5em">Diego, an expert in distributed systems and hardware architecture, merging physical computing with enterprise-scale infrastructure. Previously directing teams of 170+ engineers at Mercado Libre and orchestrating large-scale ML-based inference at Meta. At Relay, Diego’s infectious enthusiasm and hands-on leadership are redefining the boundaries of speed and reliability.</p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>Tech Stack Highlights</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Cross-platform Flutter apps with a deep focus on user experience</p></li><li><p style="min-height:1.5em">Python, Rust and TypeScript - we keep things simple but use the right tool for the job</p></li><li><p style="min-height:1.5em">Cloud-native on GCP with extensive use of BigQuery and Cloud Run</p></li><li><p style="min-height:1.5em">Extensive use of ML modelling and LLM inference - no gimmicks here, this is our daily routine</p></li><li><p style="min-height:1.5em">Emerging tech integrations, including robotics and IoT-powered operations</p></li></ul><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>What you'll do</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Work across the full stack of technology, from mobile all the way down through data infrastructure.</p></li><li><p style="min-height:1.5em">Take end-to-end ownership over thorny real-world problems, like using machine vision to automatically assess proof of delivery photos.</p></li><li><p style="min-height:1.5em">Collaborate with team members across the company.</p></li><li><p style="min-height:1.5em">Regularly spend time in the field learning how the technology you build impacts our couriers and parcel recipients.</p><p style="min-height:1.5em"></p></li></ul><p style="min-height:1.5em"><strong>Fast and Focused Hiring Process</strong></p><ol style="min-height:1.5em"><li><p style="min-height:1.5em"><strong>Talent Acquisition Interview - 30 min</strong></p></li><li><p style="min-height:1.5em"><strong>Build a UI Component Interview - 1 hour</strong></p></li><li><p style="min-height:1.5em"><strong>Design and Mobile Fundamentals Interview + AI Programming (Build an APP) - 2 hours</strong></p></li><li><p style="min-height:1.5em"><strong>Operating Principles &amp; Impact - 1 hour</strong></p></li><li><p style="min-height:1.5em"><strong>Decision and offer within 48 hours</strong>, our process mirrors our pace of work, typically completed in a week.</p></li></ol><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>Who Thrives at Relay?</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em"><strong>Aim with Precision:</strong> You define problems clearly and measure your impact meticulously.</p></li><li><p style="min-height:1.5em"><strong>Play to Win:</strong> You chase bold bets, tackle the hard stuff, and view constraints as fuel, not friction.</p></li><li><p style="min-height:1.5em"><strong>1% Better Every Day</strong>: You believe that small, consistent improvements lead to exponential growth. You move quickly, deliver results, and learn from every experience.</p></li><li><p style="min-height:1.5em"><strong>All In, All the Time</strong>: You show up and step up. You take ownership from start to finish and do what it takes to deliver when it counts.</p></li><li><p style="min-height:1.5em"><strong>People-Powered Greatness</strong>: You invest in your teammates. You give and receive feedback with care and candour. You build trust through high standards and shared success.</p></li><li><p style="min-height:1.5em"><strong>Grow the Whole Pie</strong>: You seek out win-win solutions for merchants, couriers, and our customers, because when they thrive, so do we.<br /><br />If these resonate, and you combine strong technical fundamentals with entrepreneurial drive, let’s connect.</p></li></ul><p style="min-height:1.5em"></p><p style="min-height:1.5em"><em>Relay is an <strong>equal-opportunity employer </strong>committed to diversity, inclusion, and fostering a workplace where everyone thrives.</em></p><p>Find more <a href="https://www.arbeitnow.co.uk/english-speaking-jobs">English Speaking Jobs in United Kingdom</a> on Arbeitnow</a>