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Mike LeszkoML
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Mike Leszko

@mikeleszko

Senior Data Engineer at Judi Health building scalable underwriting data models; previously developed production predictive models at Optum.

United States
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At Judi Health, I built, tested, and documented scalable data models for underwriting, improving data quality, testing, observability, and lineage standards. I also contributed to a modular data platform and supported pipeline health and performance.

At Optum, I developed predictive models using demographic, clickstream, and econometric data and brought them into production to inform member enrollment. My work also included optimizing marketing tactics through experimentation and conducting statistical analyses of longitudinal medical and prescription drug cost data.

Experience

Work history, roles, and key accomplishments

JH
Current

Senior Data Engineer, Underwriting

Judi Health

Mar 2025 - Present (1 year 7 months)

Built, tested, and documented scalable data models to support underwriting processes, improving data quality, testing, observability, and lineage standards. Collaborated with cross-functional partners to define data contracts and interfaces, and monitored pipeline health to optimize cost and performance.

Optum logoOP

Senior Data Scientist, Consumer Office

Feb 2022 - Mar 2025 (3 years 1 month)

Developed and brought to production predictive models on demographic, clickstream, and econometric data to deliver insights related to member enrollment. Supported clients by optimizing marketing tactics through experimentation, focusing on improving lower-funnel metrics such as conversions and customer retention.

Optum logoOP

Senior Research Analyst, Health Economics & Outcomes Research

Sep 2020 - Feb 2022 (1 year 5 months)

Conducted descriptive and multivariate statistical analysis on longitudinal, medical, and prescription drug costs data using regressions, GEE, survival analysis, clustering, and propensity score matching methods. Interpreted model diagnostics for correlations, collinearities, potential bias, and fit.

Optum logoOP

Analytic Research Associate, Health Economics & Outcomes Research

Aug 2018 - Sep 2020 (2 years 1 month)

Aided in data management and analysis activities spanning all project phases, including locating and assembling data from raw claim files, building datasets for analysis, and implementing and interpreting mathematical and statistical procedures and reports.

Education

Degrees, certifications, and relevant coursework

University of Minnesota logoUM

University of Minnesota

Master of Public Health, Epidemiology

Activities and societies: Graduate Minor in Biostatistics

Master of Public Health in Epidemiology with a graduate minor in Biostatistics.

Tech stack

Software and tools used professionally

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