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@rogerwilliamtchegui
I am a data scientist delivering scalable analytics and actionable business insights.
I am a results-driven Data Scientist / Data Analyst with over five years of experience in machine learning, predictive modeling, data architecture, and visualization. I have designed, developed, and deployed computationally complex data solutions across healthcare, finance, and regulatory reporting to deliver high-quality, actionable insights.
At Mantech and prior roles at United Health Group, Bloom Energy, and Cisco, I built end-to-end pipelines, optimized processing (for example reducing pipeline time from 4 hours to 45 minutes), and implemented Salesforce automations that cut manual entry by 45% while improving lead-to-opportunity conversion. I am proficient in Python, R, SQL, AWS (S3, EMR), Hadoop ecosystem, Tableau and Power BI, and I collaborate cross-functionally to translate business requirements into dashboards, models, and measurable outcomes.
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Work history, roles, and key accomplishments
ManTech
Jul 2024 - Present (1 year 4 months)
Led end-to-end data analytics and pipeline optimizations, reducing processing time from 4 hours to 45 minutes (≈40% efficiency gain) and automating Salesforce processes to cut manual data entry by 45% while improving lead-to-opportunity conversion by 30%.
UnitedHealth Group
Sep 2022 - Jun 2024 (1 year 9 months)
Developed backend modules and automated data pipelines supporting a financial platform with 200K+ daily active users. Performed ETL and text analytics on EHR and claims data to improve data quality, reporting, and stakeholder decision-making.
Bloom Energy
May 2022 - Aug 2022 (3 months)
Developed automated ETL pipelines and web-based data capture tools to streamline data collection and reduce manual effort, and created SSAS/SSRS reports and statistical analyses to inform strategic business decisions.
Cisco Systems
Jan 2020 - Apr 2022 (2 years 3 months)
Automated data processing with Python and SQL, reducing manual reporting time by 40% and accelerating pipeline delivery by 35%; developed Power BI dashboards that improved stakeholder insights by 25% and optimized PL/SQL queries to cut runtimes from 120s to under 10s.
Degrees, certifications, and relevant coursework
Master of Science, Data Science
Completed Master of Science in Data Science at Southern Methodist University in December 2022.
Bachelor of Science, Petroleum Engineering
Completed Bachelor of Science in Petroleum Engineering at the University of Texas Permian Basin in December 2016.
Associate of Science, Sciences
Completed Associate of Science at Tarrant County College in May 2013.
Software and tools used professionally
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