{"id":185865,"url":"https://alion.io/job/signifyd-data-scientist-ii-2","title":"Data Scientist II","company":{"id":48225,"name":"Signifyd","domain":"signifyd.com","url":"https://alion.io/company/signifyd","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":85,"open_postings":5,"ghost_share":0,"stale_share":0.6,"repost_share":0,"time_to_fill_p50_days":31,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Data Science","role_family":"Data Science","seniority":"middle","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Belfast, United Kingdom"],"countries":["GB"],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":65000,"max_usd":157000,"period":"year","method":"role_seniority_country_cell","sample_n":14},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Databricks","optional":false},{"name":"GCP","optional":false},{"name":"Machine Learning","optional":false},{"name":"Python","optional":false},{"name":"Slack","optional":false},{"name":"Spark","optional":false},{"name":"SQL","optional":false},{"name":"A/B Testing","optional":true}],"status":"live","first_seen_at":"2026-09-01T13:41:06Z","employer_posted_date":"2026-09-30","last_verified_at":"2026-10-17T02:58:34Z","board_verified":true,"closed_at":null,"days_open":45,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":45},"description":"At Signifyd, we help merchants confidently grow their businesses by building trusted relationships with their customers. Our advanced technology, combined with a team genuinely invested in our clients’ success, creates frictionless shopping experiences, approving more good orders, protecting revenue, and keeping customers happy.\nTrusted by thousands of leading merchants across more than 100 countries, we securely process billions of transactions each year. Our people are the heart of everything we do, driving our mission forward with commitment, empathy, and creativity. Join us on our mission to empower confident, fraud-free commerce by helping online retailers provide superior customer experiences and eliminate fraud. Learn about our company values here!\nThe Applied Decision Science (ADS) team builds production ML models and risk management tools that are the core of Signifyd's product. We help businesses of all sizes minimize their fraud exposure and grow their sales. We improve the e-commerce shopping experience for everyone by reducing the friction experienced by good buyers and blocking fraudulent purchase attempts.\nADS builds and manages the entire decision stack - from designing and deploying the ML models that assess the riskiness of a transaction, to building the tools the Risk team uses to manage and fight fraud. We seek to standardize and automate repetitive work so we can spend more time on experiments and high-leverage projects.\nWe value collaboration and team ownership. Data scientists in Signifyd are true “full stack” operators, requiring knowledge of how transaction information received via our API traverses its way through our system and into the models we are responsible for building. When you test a hypothesis at Signifyd, you’re responsible for the end-to-end development, deployment, and evaluation process. This is a massive responsibility, and no one should feel like they're solving a hard problem alone. Together we help each other develop our skillsets through peer review of experiments and code, group paper study to deepen our machine learning and statistical understanding, and frequent knowledge-sharing through live demos, write-ups, and cross-team projects. All team members are expected and encouraged to weigh in as an external reviewer on a peer's idea or approach, regardless of level.\nA couple quick notes on the Signifyd culture:\nWe’re no stranger to remote work. Most of our workforce (ICs and leaders) are primarily remote. We tend to gather individual teams together once a year. There is no travel requirement for this role.\nWe are heavy Slack users.\nWe are heavy users of generative AI tools. We dislike token-maxxing, but enjoy the expansion of capabilities that have come with genAI. We ask that during the interview you don’t use genAI, as we want to know what you know.\nResponsibilities: \nPartner with the Business Unit Lead and their merchant portfolio to identify gaps in decisioning performance and implement solutions, with guidance from senior team members.\nUtilize existing, or build net new production machine learning models that identify fraud, in collaboration with other data scientists and machine learning engineers.\nIdentify and build automation that reduces repetitive manual work.\nRun experiments to identify optimal decisioning strategies, balancing complexity and performance.\nCommunicate complex ideas to a variety of audiences, from Customer Success and Sales, to limited interactions with external customers.\nWrite production and offline analytical code in Python.\nWork with distributed data pipelines in Spark/Databricks/GCP.\nRequirements: \nA degree in computer science or a comparable analytical field.\n3+ years of post-undergrad work experience required.\nStrong verbal and written communication skills.\nStrong machine learning and statistical background.\nWrite code and review others' in a shared codebase in Python.\nPractical SQL knowledge.\nDesign experiments and collect data.\nExperience with distributed analytics and data tooling such as Spark and Databricks.\nThis role has on-call shifts, as part of our weekend rotation, Fri/Sat/Sun. While the number of shifts is subject to change, currently it works out to about six weekends a year.\nNice to Have:\nPrevious work in fraud, payments, or e-commerce.\nData analysis in a distributed environment.\nA passion for writing well-tested production-grade code.\nExperience with AI coding agents and automation.\nExperience of running A/B tests in production environments.\nAn advanced degree.\n#LI-Remote\nOur UK benefits:\nStock Options\nAnnual Performance Bonus or Commissions\nPension matched up to 8%\n‘Day one’ access to great health, dental and optical insurance scheme \nGenerous annual leave plus public holidays\nCycle to Work Scheme\nEnhanced maternity and paternity leave (12 weeks full-pay for mums & dads, plus 12 weeks half-pay for mums)\nRegular paid social events organized by our social committee \nOn-Demand Therapy for all employees & their dependents\nDedicated learning budget through Learnerbly\nWe are committed to equality of opportunity for all staff and applications from individuals are encouraged regardless of age, disability, sex, gender reassignment, sexual orientation, pregnancy and maternity, race, religion or belief and marriage and civil partnerships.\nWe also want to provide an inclusive interview experience for all, including people with disabilities. 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