Mario Koulias
Senior Product Manager @Unbiased
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WORK HISTORY
Senior Product Manager @Unbiased
London, GB
Senior Product Manager | Consumer GrowthOwned product strategy and roadmap across core consumer journeys within a subscription-led, two-sided marketplace, aligning cross-functional teams around growth and revenue outcomes.Delivered £2.7m+ annualised revenue uplift through structured experimentation, driving both conversion improvements (increasing marketplace volume) and lead quality improvements (increasing pricing and adviser acceptance rates)Designed and executed 27 A/B tests (50%+ success rate, 12% average uplift), embedding disciplined experimentation and clear ROI accountability across the team.Identified high-leverage opportunities through behavioural analysis and funnel diagnostics, driving measurable improvements in conversion, engagement, and retention.Owned commercial performance across key journeys, delivering against quarterly revenue targets through experimentation and optimisation.Led a cross-functional growth squad (engineering, design, data, commercial), increasing experimentation velocity and influencing senior stakeholders through data-led decision-making.Improved performance across a two-sided marketplace by increasing user intent and data capture, strengthening pricing power and overall marketplace economics.
EDUCATION
City University Businees School
2:1, Business Studies
SKILLS
ABOUT MARIO KOULIAS
I’m a Senior Product Manager with 10+ years’ experience building and scaling consumer products that drive measurable commercial growth.My focus is simple: identify the highest-leverage opportunities, validate them quickly, and turn insight into revenue.Across fintech and marketplace platforms, I’ve led structured experimentation programmes delivering £2.7m+ revenue uplift, improving both conversion (marketplace volume) and lead quality (pricing and acceptance rates). I specialise in diagnosing growth constraints across the full customer journey — from acquisition and activation through to engagement, retention, and monetisation.I combine deep qualitative insight with rigorous quantitative analysis, forming clear hypotheses and validating them through disciplined experimentation. I care about evidence over opinion and outcomes over output.I do my best work in environments where product is treated as a strategic growth lever, with clear ownership of commercial outcomes.What I’m known forIdentifying leverage Spotting the 20% of opportunities that drive 80% of impact.Building experimentation engines Designing and scaling structured testing frameworks that drive consistent learning and measurable results.Commercial product leadership Aligning roadmaps to revenue, LTV, and marketplace performance — not just feature delivery.End-to-end ownership From discovery through to optimisation — accountable for outcomes, not output.Customer insight at scale Embedding behavioural insight and real user research into product decision-making.
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