{"id":4062787,"url":"https://alion.io/job/ravelin-junior-data-scientist","title":"Junior Data Scientist","company":{"id":39214,"name":"Ravelin","domain":"ravelin.com","url":"https://alion.io/company/ravelin","size_band":"11-50","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Pinpoint","truth_index":null},"role":"Data Science","role_family":"Data Science","seniority":"junior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"inferred_payroll_markers","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":1,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Machine Learning","optional":false},{"name":"NumPy","optional":false},{"name":"Python","optional":false},{"name":"PyTorch","optional":false}],"status":"live","first_seen_at":"2026-11-10T09:42:55Z","employer_posted_date":"2026-11-10","last_verified_at":"2026-11-11T09:42:55Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Who are we?\n\nHi! We are Ravelin! We're a fraud detection company using advanced machine learning and network analysis technology to solve big problems. Our goal is to make online transactions safer and help our clients feel confident serving their customers.\n\nAnd we have fun in the meantime! We are a friendly bunch and pride ourselves in having a strong culture and adhering to our values of empathy, ambition, unity and integrity. We really value work/life balance and we embrace a flat hierarchy structure company-wide. Join us and you’ll learn fast about cutting-edge tech and work with some of the brightest and nicest people around -check out our Glassdoor reviews.\n\nIf this sounds like your cup of tea, we would love to hear from you! For more information check out ourblog to see if you would like to help us prevent crime and protect the world's biggest online businesses.\n\nThe Team\n\nYou will be joining the Detection team. The Detection team is responsible for keeping fraud rates low - and clients happy - by continuously training and deploying machine learning models. We aim to make model deployments as easy and error free as code deployments. Google’sBest Practices for ML Engineering is our bible.\n\nOur models are trained to spot multiple types of fraud, using a variety of data sources and techniques in real time. The prediction pipelines are under strict SLAs, every prediction must be returned in under 300ms. When models are not performing as expected, it’s down to the Detection team to investigate why.\n\nThe Detection team is core to Ravelin’s success. They work closely with the Data Engineering Team who build infrastructure and the Intelligence & Investigations Team who liaise with clients.\n\nThe Role\n\nWe are currently looking for a Data Scientist to help train, deploy, debug and evaluate our fraud detection models. Our ideal candidate is pragmatic, approachable and filled with knowledge tempered by past failures.\n\nEvaluating fraud models is hard; often times we do not even get labels for 3 months. You’ll need to use your judgement when investigating cases of ambiguous fraud and when you’re investigating the veracity of the model itself.\n\nWe have to build robust models that are capable of updating their beliefs when they encounter new methods of fraud: our clients expect us to be one step ahead of fraud, not behind. You will be given the equipment, space and guidance you need to build world class fraud detection models.\n\nThe work is not all green field research. The everyday work is about making safe incremental progress towards better models for our clients. The ideal candidate is willing to get involved in both aspects of the job - and understand why both are important.\n\nKey Responsibilities\nBuild out our model evaluation and training infrastructure.\nDevelop and deploy new models to detect fraud whilst maintaining SLAs\nWrite new features in our production infrastructure\nResearch new techniques to disrupt fraudulent behaviour\nInvestigate model performance issues (using your experience of debugging models).\nRequirements\nAround 1 year's experience building and deploying ML models using the Python data stack (numpy, pandas, sklearn or pytorch).\nStrong analytical skills.\nBeing a strong collaborator with colleagues outside of your immediate team, for example with client support teams or engineering.\nBeing skilled at communicating complex technical ideas to a range of audiences.\nThe ability to prioritise and to manage your workload.\nBeing comfortable working with a hybrid team\nBenefits\nFlexible Working Hours & Remote-First Environment - Work when and where you’re most productive, with flexibility and support.\nComprehensive BUPA Health Insurance - Stay covered with top-tier medical care for your peace of mind.\n£1,000 Annual Wellness and Learning Budget - Prioritise your health, well-being and learning needs with funds for fitness, mental health, and more.\nMonthly Wellbeing and Learning Day - Take every last Friday of the month off to recharge or learn something new, up to you.\n25 Days Holiday + Bank Holidays + 1 Extra Cultural Day - Enjoy generous time off to rest, travel, or celebrate what matters to you.\nMental Health Support via Spill - Access professional mental health services when you need them.\nAviva Pension Scheme - Plan for the future with our pension program.\nRavelin Gives Back - Join monthly charitable donations and volunteer opportunities to make a positive impact.\nFortnightly Randomised Team Lunches - Connect with teammates from across the company over in person or remote lunches every other week on us!\nCycle-to-Work Scheme - Save on commuting costs while staying active.\nBorrowMyDoggy Access - Love dogs? Spend time with a furry friend through this unique perk.\n Weekly Board Game Nights & Social Budget - Unwind with weekly board games or plan your own socials, supported by a company budget.\n\n*Job offers may be withdrawn if candidates do not meet our pre-employment checks: unspent criminal convictions, employment verification, and right to work.*","description_format":"text","description_chars":5043,"description_truncated":false,"requirements":{"experience_years_min":1,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Flexible schedule","Health insurance"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Commerce","Cybersecurity","Fraud Detection"],"lifecycle":[{"event":"open","at":"2026-11-11T09:42:55Z"}],"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":"2026-11-11T07:38:50+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":1,"expected_fill_days":30,"reasons":["conf:0","win:early","comp:junior"],"computed_at":"2026-11-11T10:26:10Z"},"pay":null,"html_url":"https://alion.io/job/ravelin-junior-data-scientist","json_url":"https://alion.io/job/ravelin-junior-data-scientist.json","meta":{"generated_at":"2026-11-11T10:26:10Z","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":17797,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-12T00:00:00Z"}},"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":39214},"rest":"https://alion.io/mcp/rest/get_company?id=39214"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fravelin-junior-data-scientist"},{"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%2Fravelin-junior-data-scientist"},{"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%2Fravelin-junior-data-scientist"},{"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/ravelin-junior-data-scientist\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fravelin-junior-data-scientist"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":4062787}},{"tool":"search_jobs","arguments":{"company":"ravelin.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":4062787},"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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