DATA SCIENTIST

Devi
Jayamangala

Building production ML systems that drive business decisions. Mortality-risk models, demand forecasting, MLOps pipelines — from feature engineering to real-time inference.

0
YRS EXPERIENCE
0
MODELS IN PROD
0
PIPELINE UPTIME
0
DRIFT ALERTS MISSED
// ABOUT

Turning data
into decisions

I'm a Data Scientist at Prudential Financial, building mortality-risk and premium-determination models for life insurance underwriting. My work sits at the intersection of classical ML, statistical modeling, and business impact.

With 5+ years across insurance, pharma, and financial services, I specialize in taking models from Jupyter notebooks to production endpoints — with monitoring, drift detection, and automated retraining built in from day one.

Python XGBoost AWS SageMaker Jupyter Notebook Airflow Spark LangChain
// CASE STUDIES

Production
Systems

End-to-end ML systems deployed in regulated, high-stakes environments.

01

Mortality-Risk & Premium Models

Prudential Financial · Life Insurance Underwriting

XGBoost SageMaker Airflow

Built an XGBoost + Logistic Regression ensemble on 800K+ policyholder records for mortality-risk scoring. Engineered 140+ features, implemented champion-challenger framework with actuarial calibration, and deployed on AWS SageMaker with real-time + batch inference endpoints.

0.94
AUC-ROC
-23%
Premium Leakage
<50ms
P95 Latency
15K+
Daily Requests
02

LLM/RAG Document Extraction

Insurance Policy Parsing · GenAI

GPT-4 LangChain ChromaDB

RAG pipeline using GPT-4 + LangChain + ChromaDB for intelligent document parsing. 512-token sliding windows, structured Pydantic validation for 40+ fields, deployed serverless on AWS Lambda with S3 triggers.

96%
Extraction Accuracy
400
Docs/Hour
-65%
Review Time
$0.08
Cost/Doc
03

Demand Forecasting + Feature Store

Multi-SKU Prediction · Feast

Prophet LightGBM Feast

Prophet + LightGBM hybrid with shared Feast feature store serving 3 downstream models. Bayesian hyperparameter optimization on rolling cross-validation.

7.1%
MAPE (from 12.4%)
-31%
Stockout Reduction
3
Models Served
-43%
Eng. Effort
04

Model Monitoring & Auto-Retraining

MLOps · Drift Detection · Airflow

PSI/CSI Airflow Canary

PSI/CSI monitoring across 15 production models. Tiered alerting with automated retraining triggers and canary deployment with rollback on AUC degradation.

2d
MTTR (from 14d)
0
Silent Failures
15
Models Monitored
85%
Auto-Resolved
05

Medallion Architecture & Governed Reporting

Databricks · Delta Lake · dbt

Databricks dbt Power BI

Bronze/Silver/Gold medallion on Databricks + Delta Lake. dbt transformations with Great Expectations quality checks. Power BI dashboards with row-level security serving 200+ stakeholders.

12min
Refresh (from 4hr)
99.7%
Data Quality
200+
Users Served
-80%
Compute Cost
06

A/B Testing Framework

Bayesian Experimentation · Sequential Testing

Bayesian Thompson Kafka

Bayesian A/B testing with Thompson Sampling for dynamic traffic allocation. Sequential testing with O'Brien-Fleming spending function. Guard rails for automatic stopping on loss-ratio drift.

8/qtr
Velocity (from 2)
-40%
Time to Decision
<3%
False Positive
$2.1M
Annual Impact
// STACK

Technical
Proficiency

LANGUAGES

Python95%
SQL90%
R70%

ML / AI

Scikit-learn XGBoost LightGBM PyTorch TensorFlow Prophet LangChain RAG

DATA ENGINEERING

Spark Airflow dbt Kafka Delta Lake Snowflake BigQuery

CLOUD / MLOPS

AWS SageMaker GCP Vertex AI MLflow Docker Kubernetes Databricks Feast
// EXPERIENCE

Career
Timeline

Jun 2026 — Present

Data Scientist

Prudential Financial · Newark, NJ

Building mortality-risk models and premium determination for life insurance underwriting. Champion-challenger scoring with XGBoost in AWS SageMaker. End-to-end model lifecycle from feature engineering through production monitoring.

Mar 2025 — May 2026

Data Scientist

Pfizer · New York, NY

ML models on health/demographic data for propensity and marketing measurement. Databricks + PySpark pipelines with Delta Lake and Airflow. FastAPI + Docker/K8s deployments with MLflow.

Sep 2023 — Feb 2025

Data Scientist

Capgemini · Jersey City, NJ

Risk assessment, pricing, and decision-support for financial services. Bronze/Silver/Gold pipelines with Spark + Delta Lake. A/B testing practices and automated Tableau/Power BI reporting.

Jul 2020 — Aug 2022

Machine Learning Engineer

Zensar Technologies · Pune, India

Prediction, segmentation, and measurement analyses. Clustering, PCA, and published research methods. Full model lifecycle from EDA through production monitoring.

2018 — 2020

MS Computer Science

University of Bridgeport · GPA 3.77

AWS ML Specialty SnowPro Core
// CONTACT

Let's Build
Together

Open to full-time roles in Data Science, ML Engineering, and AI — remote or anywhere in the US.