Looking for a job

sumit kumar

@sumitkumar44

Message

I build AWS-backed Java microservices and production AI features for fintech and consumer products.

India

Message

What I'm looking for

I'm open to backend development roles in Delhi NCR, Bengaluru, Kolkata, or Pune where I can build Spring Boot, AWS, and AI-integrated production systems.

At Tech Vortex Ventures, I lead backend delivery and AWS architecture for Keypr, coordinating a six-developer product team. I've built AI matchmaking pipelines with LangChain4j and Spring AI, automated photo moderation with Rekognition, and developed 40+ REST API endpoints.

Previously at Zillionica, I integrated seven-plus trading exchanges into an automated platform processing thousands of daily orders and improved API response times by roughly 40%. I build secure Spring Boot services, cloud-native systems, and reliable production workflows.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Tech Vortex Ventures Pvt. Ltd.

Feb 2025 - Present (1 year 7 months)

Coordinate backend delivery for a 6-developer team, design and manage AWS architecture, and build AI-powered matchmaking pipelines with LangChain4j and Spring AI.

Java Spring Boot AWS LangChain4j Spring AI REST APIs Docker Jenkins Kafka MongoDB MySQL PostgreSQL Code Review Team Leadership

Software Developer

Zillionica

Jan 2023 - Feb 2025 (2 years 1 month)

Integrated APIs from 7+ trading exchanges into an automated trading platform, improved API response times by 40%, and secured services with Spring Security and JWT.

Java Spring Boot Spring Security JWT AWS SQS AWS RDS Python MongoDB Snowflake REST APIs Kafka CI CD

Java Developer

Mithila Softech

May 2021 - Dec 2022 (1 year 7 months)

Developed Spring Boot REST APIs and image/video preview APIs for advertising-industry products, including advanced search with JPA Specifications and the Criteria API.

Java Spring Boot REST APIs JPA Kafka Cybersecurity Cryptography