{"id":3972699,"url":"https://alion.io/job/relay-technologies-limited-senior-data-scientist-personalisation","title":"Senior Data Scientist, Personalisation","company":{"id":3799710,"name":"Relay Technologies Limited","domain":"relaytech.co","url":"https://alion.io/company/relaytech","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":95,"open_postings":20,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":152,"computed_at":"2026-11-10T06:52:35Z"}},"role":"Data Science","role_family":"Data Science","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Machine Learning","optional":false},{"name":"Recommender Systems","optional":false},{"name":"Reinforcement Learning","optional":false}],"status":"live","first_seen_at":"2026-11-09T15:50:56Z","employer_posted_date":"2026-11-09","last_verified_at":"2026-11-10T19:03:22Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"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, and a recently closed Series B ($95M), Relay is scaling faster than 99% of venture-backed startups. We're assembling the most talent-dense team the logistics industry has ever seen\nRelay’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.\nTHE TEAM\n\n~160 people, around half in engineering, product and data\n45+ advanced degrees across computer science, mathematics and operations research\nThousands of data points captured, calculated, analysed and predicted for every single parcel we handle\nAn intellectually vibrant culture of first-principles thinking, tight feedback loops and relentless experimentation\nEvery courier who works with Relay chooses their day. A day is a set of routes that have to fit together, and every courier's ideal day competes with everyone else's. Work is finite and every route still has to be covered, so matching thousands of couriers to the work they want is a recommendation problem with few precedents.\nScience at Relay is the brain of the operation: machine learning, operational research, recommender systems, causal inference, location intelligence and experimentation, working together to decide how every parcel gets delivered. There's no existing recommender to iterate on. You'll build it.\nRecommender Systems Highlights\nCombinatorial, constrained and competitive: every recommendation has to be feasible for the whole network, not just right for one courier.\n\nYour models power large-scale optimisation that balances thousands of couriers' preferences against the constraints of a physical network.\n\nPrice is part of the recommendation, so economics, personalisation and optimisation have to work as one.\n\nOur apps collect millions of data points every day.\n\nThe Opportunity\nAs a Senior Data Scientist at Relay, you'll:\nSet the standard for recommender systems at Relay.\n\nLead the evolution of Relay's recommender from research to production.\n\nDesign and build the recommender systems that power Relay's key decisions.\n\nPartner with Operational Research to unite recommender models and optimisation.\n\nContribute to Relay's research culture, and develop our voice in the tech community.\n\nWe're looking for candidates who…\nHave built recommender systems at scale, owned them in production, and led their direction.\n\nBring deep expertise in recommender systems, reinforcement learning and LLMs, whether from a PhD, publications, or years at the frontier in industry.\n\nThink in experiments, and let evidence guide decisions.\n\nAre energised by open-ended problems, and know how to make them tractable.\n\nCollaborate generously, and explain complex ideas simply.\n\nDon't tick every box? If this problem excites you, we'd still love to hear from you.\nWho Thrives at Relay?\nAim with Precision: You define problems clearly and measure your impact meticulously.\n\nPlay to Win: You chase bold bets, tackle the hard stuff, and view constraints as fuel, not friction.\n\n1% Better Every Day: You believe that small, consistent improvements lead to exponential growth. You move quickly, deliver results, and learn from every experience.\n\nAll 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.\n\nPeople-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.\n\nGrow the Whole Pie: You seek out win-win solutions for merchants, couriers, and our customers, because when they thrive, so do we. If these resonate, and you combine strong technical fundamentals with entrepreneurial drive, let’s connect.\n\nRelay is an equal-opportunity employer committed to diversity, inclusion, and fostering a workplace where everyone thrives.","description_format":"text","description_chars":4167,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"phd","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Commerce","Delivery"],"lifecycle":[{"event":"open","at":"2026-11-09T16:48:05Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"adverts_offering_sponsorship_24m":0,"sanctioned_now":false,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-11-10T11:34:35+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":152,"reasons":["conf:3","win:early"],"computed_at":"2026-11-10T06:52:35Z"},"pay":null,"html_url":"https://alion.io/job/relay-technologies-limited-senior-data-scientist-personalisation","json_url":"https://alion.io/job/relay-technologies-limited-senior-data-scientist-personalisation.json","meta":{"generated_at":"2026-11-10T21:11:27Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":14636,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-11T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":3799710},"rest":"https://alion.io/mcp/rest/get_company?id=3799710"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Frelay-technologies-limited-senior-data-scientist-personalisation"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Frelay-technologies-limited-senior-data-scientist-personalisation"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Frelay-technologies-limited-senior-data-scientist-personalisation"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/relay-technologies-limited-senior-data-scientist-personalisation\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Frelay-technologies-limited-senior-data-scientist-personalisation"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3972699}},{"tool":"search_jobs","arguments":{"company":"relaytech.co","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3972699},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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