Hi, I'm Sion Chowdhury

I am a |

Passionate Java Backend Developer with 3+ years of experience building scalable, high-performance applications using cutting-edge technologies.

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About Me

I am a dedicated Java Backend Developer with over 3 years of experience at Nisum, specializing in designing and deploying scalable, high-performance applications. Skilled in optimizing system performance and enhancing eCommerce platforms, and proficient in Java, Python, and AI/ML concepts.

Years Experience

$1M+

Cost Savings

Awards Won

8.96

CGPA

Experience

Java Backend Developer

Nisum Aug 2022 - Present

Spearheaded the development and optimization of the Schedule & Save platform for Albertsons’ eCommerce site, increasing user engagement by 35% and boosting sales by 20%.
Enhanced codebase efficiency, reducing application latency by 60% and improving UX.
Created in-house platform saving clients $1M annually by removing third-party dependencies.
Designed and implemented 20+ APIs for Safeway’s eCommerce platform, reducing system downtime by 15%.
Developed functional tests with Docker TestContainer and JUnit achieving 85%+ code coverage.
Fixed Sonar & Veracode vulnerabilities, improving security by 30%.
Implemented third-party payment gateway integrations and error handling logic for resilience.
Leveraged GitHub Copilot to accelerate development and meet sprint deadlines.

Excellence Award Rockstar Award

Technical Skills

Programming Languages

Java 8/17 Python SQL Data Structures Algorithms JSON

Frameworks & Libraries

Spring Boot Spring WebFlux Spring Cloud Kafka Scikit-learn

Databases & Cloud

MS SQL Server PostgreSQL MongoDB AWS Azure Kubernetes Services

Concepts & Tools

Microservices Architecture REST API Design Agile Methodologies GenAI GitHub CI/CD Docker Grafana

Featured Projects

URL Shortener with Enhanced Analytics

Full-stack URL shortener handling 1000+ daily unique requests with analytics dashboard and Nginx load balancing.

Java 21 Spring Boot PostgreSQL Nginx Python (Analytics)

Banking Application With OAuth2

Reactive banking application built on Spring Boot with OAuth2 authentication and hosted on Google Cloud Platform.

Spring Boot OAuth2 Google Cloud Platform Kubernetes

Gen-AI Resume Chatbot

AI-driven chatbot using Google Gemini API enabling real-time Q&A based on my resume.

FastAPI Google Gemini AI Python HTML/CSS/JS