Sourabh Ranjan Kar

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About Me

Sourabh Ranjan Kar

Full Stack Developer

Full-Stack Developer with 3+ years of experience in fintech and logistics, building scalable and secure applications that improve performance and user experience. Skilled in Java/Spring Boot for backend services and React/TypeScript for developing responsive interfaces. Experienced in REST API design, CI/CD automation, and deploying microservices on AWS ECS (Fargate) using CloudFormation and Lambda integrations. Proficient in PostgreSQL and Docker, with hands-on experience in Python, applied ML, and Generative-AI integrations (OpenAI API, LangChain).

Frontend

React.js Angular TypeScript Redux JavaScript (ES6+)

Backend & Cloud

Java Spring Boot REST APIs Microservices AWS ECS Lambda API Gateway CloudFormation Docker Kubernetes

Databases

PostgreSQL MySQL Azure SQL MongoDB SQL Server

Testing & Code Quality

JUnit Mockito Postman Jest SonarQube

Security

Spring Security OAuth2 JWT RBAC

AI & Analytics

Python Pandas NumPy scikit-learn Predictive Modeling

Projects

Generative AI Knowledge Assistant

Built a conversational LLM assistant to summarize documents and answer FAQs using vector-based retrieval. Integrated OpenAI GPT API with LangChain for semantic search. Deployed serverlessly on AWS Lambda for sub-second responses.

Python LangChain OpenAI AWS Lambda

Predictive Modeling – Alzheimer’s & Healthy Aging

Built ML models analyzing CDC aging data to identify cognitive health factors. Applied Random Forest and K-Means clustering for state-level patterns. Visualized insights in Tableau for preventive healthcare trends.

Python scikit-learn Tableau Data Analysis
View Project

Experience

Full Stack Developer

Fifth Third Bancorp

Oct 2024 – Present | Remote, USA
  • Engineered KYC verification and onboarding dashboard (React/TypeScript + Spring Boot microservices) with LexisNexis API integration, reducing setup time by 20%.
  • Enhanced REST APIs with pagination, idempotency, and caching via AWS API Gateway for high-volume workloads.
  • Optimized AWS RDS with partitioning and indexing, boosting query performance by 40%.
  • Introduced event-driven workflows using AWS SQS, reducing response latency by 25%.
  • Automated infrastructure with CloudFormation and S3 presigned uploads for KYC documents, strengthening security.
  • Deployed Dockerized microservices on ECS (Fargate) with blue/green rollouts via CodePipeline.
  • Expanded test coverage with JUnit, Mockito, and SonarQube, cutting production defects by 30%.

Full Stack Developer

Federal Express Corporation (FedEx AMEA)

Jan 2021 – Jul 2023 | India
  • Delivered shipment-tracking modules using Angular and Spring Boot for 20+ countries, improving visibility by 30%.
  • Built multilingual Angular frontend with ngx-translate and reactive forms for APAC & EMEA regions.
  • Integrated WebSockets, RxJS, and NgRx with Kafka for real-time updates and event-driven delivery tracking.
  • Refined Azure SQL with stored procedures, indexing, and partitioning, cutting query times by 40%.
  • Enhanced backend security via Spring Security, OAuth2, JWT, and RBAC, reducing vulnerabilities by 35%.
  • Improved CI/CD pipelines with SonarQube and gated approvals, reducing deployment cycles from 2 days to 6 hours.

Education

MS in Advanced Data Analytics

University of North Texas | Denton, Texas

Aug 2023 – May 2025

Bachelor of Science in Computer Science and Engineering

Loyola Academy Degree and PG College | India

Jun 2017 – Nov 2020

Certifications

AWS Certified Developer – Associate

Certified

GenAI and LLMs on AWS

Coursera

Certified
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