Open to opportunities

Sisira User

@sisirauser

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Senior Data Scientist delivering scalable ML, NLP, and cloud-native data platforms to drive business impact.

United States

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What I'm looking for

I seek a role building production ML and NLP systems at scale, with cross-functional collaboration, cloud-native infrastructure, and measurable business impact.

I am a Senior Data Scientist with nearly five years of experience building end-to-end machine learning, NLP, and Generative AI solutions across fintech, e-commerce, and healthcare. I design and operate cloud-native data platforms and ML pipelines on AWS, Azure, and GCP, productionize models with Docker/MLflow and CI/CD, and create executive analytics that improve decision-making and operational outcomes.

My work has reduced default risk by 18%, improved portfolio quality by 15%, sped up ETL pipelines by 30%, and cut repeat customer complaints by 25% through NLP-driven insights. I combine rigorous experimental design, feature engineering, and advanced modeling (time series, deep learning, transformers) to deliver measurable results and collaborate cross-functionally to translate business problems into scalable analytical systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Scientist

Current

Upbound Group

Jun 2025 - Present (9 months)

Developed and deployed credit risk and ML solutions that reduced default risk by 18% and improved portfolio quality by 15%; built end-to-end pipelines and data warehouses supporting 50M+ records and accelerated ETL performance by 30%.

Python SQL Azure Data Factory Databricks Snowflake NLP MLFlow

Data Scientist

DoorDash

Aug 2024 - May 2025 (9 months)

Developed demand forecasting and predictive models improving production planning and delivery logistics; built ML pipelines and segmentation/LTV models across 40M+ records and improved customer satisfaction by 15%.

Python R ARIMA Prophet TensorFlow Snowflake AWS A B Testing

Data Scientist

Cognizant

Aug 2022 - Jul 2023 (11 months)

Analyzed large-scale clinical and operational datasets to support vaccine development and clinical trials, improved pipeline reliability by 30% and produced dashboards and analytics for regulatory compliance.

Python SQL BigQuery Snowflake Tableau Power BI Spark AWS

Data Analyst

Nectar Lifesciences Limited

Mar 2020 - Jul 2022 (2 years 4 months)

Built predictive models and ETL pipelines to improve manufacturing and supply chain forecasting, increasing forecast accuracy by 20% and delivering operational dashboards for production and inventory KPIs.

Python SQL Azure Data Factory Spark Power BI Tableau Snowflake Forecasting