Senior Machine Learning Engineer

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 (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 seenRelay’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• ~110 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 experimentationEvery parcel Relay handles is touched by ML. We recommend and optimise route assignment, predict delivery durations, estimate parcel dimensions and weight, detect objects in images on device, forecast demand and decide network handovers. That's 10+ models running in the critical path of a live logistics network where quality is non-negotiable.ML Stack HighlightsPython and Rust. We keep things simple but use the right tool