Data Scientist

Transak; Greater London; Hybrid; GBP 55,000 - 75,000; Full time

Benefits offered by this job

Comprehensive healthcare package

Career development opportunities

Flexible working hours

Work-from-home options

Job summary

Transak is hiring a mid-level Data Scientist to join their Data team in Greater London. The role involves designing and deploying machine learning models to combat fraud while ensuring user experience. You will collaborate across teams like Product and Engineering, impacting product strategy and growth.

The ideal candidate should have experience in data science, a solid background in SQL and Python, and familiarity with BI tools. Transak offers a hybrid work model and comprehensive health and wellness benefits.

Qualifications

• 2 to 5 years of experience in data science or analytics.
• Solid skills in Python or R for analysis and modeling.
• Experience in crypto, payments, or fintech industries.

Responsibilities

• Develop machine learning models for fraud detection.
• Own funnel analytics and track product performance.
• Build dashboards and reporting tools for various teams.

Skills

Strong SQL

Python

Data Visualization and BI

Machine Learning intuition

Communication

Experimentation fluency

Tools

Looker

BigQuery

Tableau

TensorFlow

Job description

• We’re hiring a mid-level Data Scientist (2 to 5 years’ experience) for our Data team, working within Risk & Fraud. The brief is simple: reduce fraud without adding friction for good users
• In practice that means ML models, deterministic rules and signal tuning, and working directly with our external risk vendors. You own that work end to end, from the question, to what ships, to the decision leadership makes off the back of it
• Risk and fraud is where you’ll have the clearest impact, but the role reaches across Product, Growth, and Engineering, and your work turns into product, policy, and revenue. If you’re drawn to crypto, payments, and the kind of data they throw off, there’s a lot here to get into
• Risk, fraud and compliance. Build and iterate on fraud detection, chargeback prediction, and transaction-risk models. Develop features and rule sets that work alongside our Risk and Compliance teams to keep bad actors out without adding friction for good users
• Product analytics and growth. Own funnel analytics across on-ramp and off-ramp flows. Design and analyze A/B and multivariate experiments, identify conversion bottlenecks (KYC, payment method, geo), and partner with PMs and designers to ship measurable improvements
• ML/AI modeling. Design, train, and deploy machine learning models, from classification and forecasting to clustering and recommendation, that power decisions inside the product (e.g., dynamic payment method ranking, user lifetime value, churn prediction)
• Business intelligence and reporting. Build trusted dashboards and self-serve data products for Product, Growth, Finance, and the executive team. Define and steward the metrics that the business runs on
• Storytelling and strategy. Turn analyses into clear narratives and recommendations. Present findings to engineers, PMs, and the C‑suite alike, and influence roadmaps with data
• Data craftsmanship. Partner with Data Engineering to improve event tracking, data models, and the warehouse. Treat data quality as a first-class product

Benefits

• Team environment: Transak operates on a hybrid work model, with team members across the world. We have a culture of trust and autonomy, with a focus on communication and collaboration
• Career development: At Transak, we believe that learning is a lifelong pursuit. We provide opportunities for our team members to learn and grow, with a focus on personal and professional development
• Health & Wellness Benefits: At transak, your wellbeing is our priority. Enjoy a comprehensive healthcare package, regular wellness programs, mental health support, flexible working hours, and work-from-home options
• Work/life balance: Non-linear workdays are encouraged at Transak. We support our team members to take ownership of their time and schedule in a way that keeps them balanced in life and able to have the impact they want at work

Qualifications

• Strong SQL: You can navigate large, messy warehouses (BigQuery, Snowflake, Redshift, or similar) and write performant, readable queries.
• 2 to 5 years of experience as a data scientist, analytics engineer, or quantitative analyst, ideally at a fintech, payments, marketplace, or consumer tech company.
• Solid Python (or R) for analysis and modeling: pandas, scikit-learn, statsmodels, and at least one deep‑learning or gradient‑boosting framework (XGBoost, LightGBM, PyTorch, TensorFlow).
• Ownership: You treat ambiguous problems as opportunities and don’t wait to be told what to analyze next.
• Visualization and BI: Comfortable building dashboards in Looker, Metabase, Tableau, Superset, or similar.
• Experimentation fluency: You understand the math behind A/B testing, sample sizing, power, and common pitfalls (peeking, multiple comparisons, novelty effects).
• Communication: You can explain a confusion matrix to a PM and a funnel drop‑off to the CEO, in the same week, in the same tone.
• Machine learning intuition: You can pick the right model for the problem, evaluate it honestly (precision/recall trade‑offs, calibration, drift), and ship it responsibly.
• Experience in crypto, payments, banking, fraud, or compliance.
• Familiarity with dbt, Airflow, or similar data‑stack tooling.
• Exposure to causal inference (difference‑in‑differences, propensity scoring, uplift modeling).
• Experience deploying models to production (batch or real‑time) alongside engineers.
• Knowledge of AML / KYC frameworks or experience working with regulators.