Headline

Full Stack Developer| Python | Java | Spring Boot | Microservices | Kafka | PostgreSQL | Redis | Docker | OAuth2 | JWT | React | Open to Full stack Opportunities

About

Full Stack Developer Engineer (3.5 yrs) building secure identity infrastructure and event-driven systems for production platforms. At Tech4Biz, I own authentication and onboarding services for a live multi-tenant real estate platform (UAE) — implementing OAuth 2.0, JWT, OTP, UAE PASS government identity integration, and RBAC through Kong API Gateway. I've also implemented DPoP (Demonstrating Proof-of-Possession) token binding end-to-end: generating cryptographic key pairs, creating DPoP proof JWTs, and binding access tokens to a client's public key — a newer OAuth security extension most engineers at my level haven't touched in production. Before that, at Softic Digitech, I built backend systems across fintech and healthcare — portfolio tracking dashboards, banking fund-transfer workflows, and policy management platforms — with Spring Security, JWT-based auth, and optimized transaction workflows across MySQL, PostgreSQL, and Oracle. What I do: 🔹 Design secure, scalable REST APIs — FastAPI and Spring Boot 🔹 Implement OAuth 2.0 / JWT / DPoP / OTP-based authentication systems 🔹 Build event-driven microservices with Kafka (producers, consumers, retry/error handling) 🔹 Work across PostgreSQL, MongoDB, Redis, MySQL, Oracle 🔹 Own services end-to-end — schema design through production monitoring Tech stack: Java • Spring Boot • Python • FastAPI • OAuth 2.0 • JWT • DPoP • Kafka • PostgreSQL • MongoDB • Redis • MySQL • Oracle • Kong • Docker • AWS S3 • React.js Open to Full stack `Engineer / Java Spring Boot Developer / Python FastAPI Developer roles building systems that scale securely.

Location

Bengaluru

AI stack

antigravity

claude code

claude

codex

cursor

gemini

Work experience

Associate Developer at Tech4Biz Solutions Private Limited, Feb 2026 - Present · 10 mos, Backend engineer on a multi-persona real estate technology platform (UAE), owning authentication, onboarding, and secure data infrastructure from schema design through production monitoring. Engineered authentication and onboarding services in Python/FastAPI and Java/Spring Boot — OAuth 2.0, JWT, refresh tokens, OTP, and UAE PASS government identity integration — routed through Kong API Gateway for tenants, owners, brokers, and administrators. 1. Implemented DPoP-based token binding end-to-end: generated cryptographic key pairs, built DPoP proof JWTs, validated proofs server-side, and bound access tokens to client public keys to prevent token replay and theft — a proof-of-possession extension to standard OAuth flows. 2. Designed RBAC, broker/team invitation workflows, and onboarding-state management across PostgreSQL, MongoDB, and Redis, handling multiple concurrent user roles and permission states. 3 .Built Kafka producers and consumers for asynchronous microservice communication, with retry logic and error-handling to keep backend workflows reliable under failure conditions. 4. Implemented secure document storage and retrieval using AWS S3 and boto3, including presigned URLs for time-limited, controlled document access. 5. Built automated API test suites in pytest covering authentication, authorization, OTP, and invitation workflows to catch regressions before deployment. 6. Reviewed code, mentored junior developers, and collaborated with UI/UX, mobile, QA, and 7. DevOps across Agile sprints on requirements, architecture decisions, and performance optimization. 8. Contributed to Java backend services for an AI-agent platform integrating structured data and knowledge bases into automated workflows during initial platform development. Tech stack: Python, FastAPI, Java, Spring Boot, OAuth 2.0, JWT, DPoP, PostgreSQL, MongoDB, Redis, Apache Kafka, Kong API Gateway, AWS S3, Docker.

Java Full Stack Developer at Softic Digitech, Feb 2023 - Jan 2026 · 3 yrs, Bengaluru, Karnataka, India, As a Full Stack Developer at Softic Digitech, I design and develop scalable, maintainable web applications that enhance user experience and meet business goals. My expertise spans both frontend and backend technologies, including Java, Spring Boot, REST APIs, and modern JavaScript frameworks such as React.js and Angular. I build responsive UI components using React.js, Bootstrap, and Material UI, ensuring seamless integration with backend services via Axios and JSON-based REST endpoints. I develop secure and efficient RESTful APIs with Spring Security, employing JWT tokens and OAuth 2.0 for robust authentication and authorization. On the backend, I implement JPA/Hibernate for optimized database transactions, working with MySQL, PostgreSQL, and Oracle databases to ensure high performance and data accuracy. Operating within Agile teams, I actively participate in sprint planning, code reviews, and continuous integration/deployment cycles using tools like Jenkins, Git, and Docker. I collaborate closely with QA, DevOps, and product management teams to deliver quality software on schedule. Some key projects I have contributed to include: Investment Dashboard: Developed a FinTech application with React and Spring Boot, featuring dynamic portfolio tracking and JWT-authenticated role-based access. Fund Transfer Platform: Built banking microservices backend with Angular frontend integration, using Jenkins for automated builds and Oracle for database management. Health Insurance Portal: Created a policy management web app with React frontend and Spring Boot backend, containerized using Docker for local deployment testing. My role requires a combination of technical skills, problem-solving ability, and effective communication to deliver end-to-end solutions that align with business needs and technical best practices. I continually update my knowledge of emerging technologies and frameworks to maintain a competitive edge in software development.

Education

Bachelor of Technology, Maulana Azad College of Engineering and Technology,Patna

Bachelor of Technology, Computer Engineering, Maulana Azad Medical College

Public links

leetcode: https://leetcode.com/dhirajsinghania

dribbble.com: https://dribbble.com/dhiraj-kumar-resume