Mark J.
Data Science Manager @Trainline
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WORK HISTORY
Data Science Manager @Trainline
London, GB
Focusing on revenue diversification and travel experience for train goers
EDUCATION
UCL
MSc, Technology Entrepreneurship
General Assembly
Data Science
University of Hertfordshire
BSc, Computer Science
SKILLS
ABOUT MARK J.
I’m a data leader with 10+ years of experience - in various fields - who has- Managed and scaled a 30-person cross-functional team of product analysts and data scientists- Created company-wide metric trees to help senior executives identify key drivers and relationships that impact top-line financial metrics- Built Python-based Monte Carlo simulations to quantify financial risks and identify product opportunities to allow warehouses to accommodate double-digit order growth (£36M annually in additional revenue)- Conducted Python simulations to optimise short lead time offerings, guiding multi-million-pound development decisions- Developed a quasi-experimentation framework from scratch to assess feature releases, integrating experimentation into product development- Forecasted warehouse productivity with Random Forest models, reducing hardware over-provisioning by £0.2M- Established best practices in Product Sense, Data Storytelling, and Experimentation. Enhanced data literacy by delivering regular stakeholder workshops to 100+ people, embedding analytics into product processes, and creating self-serve dashboards- Achieved a 50x ARR increase by uncovering new growth drivers through SQL and Python analysis- Directed $10M+ marketing analytics campaigns to optimize user acquisition and retention, driving measurable results.Proficient in SQL, Python, statistical analysis, A/B testing, machine learning, metric trees
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