🚀 Java Backend Developer with 1.6 years of production experience at High Tech Infosystems
🔐 Independently designed an offline UPI payment system using hybrid RSA-OAEP + AES-256-GCM cryptography and atomic idempotency — solving real distributed systems problems
🧠 Passionate about distributed systems, fintech infrastructure, cryptography, and clean backend architecture
🌱 Currently expanding into DevOps — Docker, CI/CD pipelines, Kubernetes, GitHub Actions
| Category | Technologies |
|---|---|
| Languages | |
| Frameworks & Libraries | |
| Backend & Architecture | |
| Tools & Platforms | |
| Databases | |
| DevOps & Cloud | |
| Testing & Architecture | |
| Core CS Concepts |
Security: RSA-OAEP, AES-256-GCM, JWT, Spring Security, OAuth2
Concurrency: ConcurrentHashMap, Thread Pools, Synchronization, Locks
Observability: SLF4J, Logback, Structured Logging
Methodology: Agile (Scrum), SDLC, Code Reviews
Oct 2024 – Present
- Design and maintain 10+ production REST microservices using Spring Boot and Java, enabling independently deployable modular backend architecture
- Improved SQL query performance by ~25% through schema optimization, strategic indexing, and efficient transaction handling
- Integrated Swagger (OpenAPI) docs for all APIs — streamlined frontend–backend collaboration
- Implemented centralized exception handling and SLF4J/Logback structured logging — improved system observability
- Active contributor to Agile sprints, peer code reviews, and Git-based workflows
Jul 2024 – Sep 2024
- Built and tested Spring Boot REST APIs integrated with MySQL — full CRUD across multiple service modules
- Contributed to service-layer logic and repository pattern implementations in a production Java backend
- Gained hands-on experience in API versioning, deployment workflows, and Git-based team collaboration
Tech Stack: Java · Spring Boot · RSA-OAEP · AES-256-GCM · H2 · JPA · JUnit
- Designed mesh-routed deferred payment system enabling UPI transactions without internet — encrypted packets gossip peer-to-peer until a bridge node uploads them for settlement
- Implemented hybrid RSA-OAEP + AES-256-GCM encryption — same scheme as TLS; GCM auth tag ensures one flipped bit = decryption fails
- Solved concurrent duplicate settlement using atomic
ConcurrentHashMap.putIfAbsenton SHA-256 ciphertext hash — exactly-once guarantee verified with 3-thread concurrent JUnit test - Built two-layer replay attack prevention: 24h timestamp freshness check + nonce deduplication, both inside the authenticated ciphertext
- Software mesh simulator with gossip protocol and TTL hop logic — full end-to-end demo on a single machine
Tech Stack: Java · Spring Boot · Spring Security · JWT · MySQL · Docker
- Architected full e-commerce backend: User Management, Product Catalogue, Cart, Order Processing — clean Controller–Service–Repository pattern throughout
- Secured all APIs with Spring Security JWT + RBAC (ADMIN/USER roles), Google OAuth2 social login, Docker Compose deployment
- Swagger (OpenAPI) docs, ModelMapper for DTO–Entity mapping, Bean Validation for input handling
Tech Stack: Node.js · Socket.io · HTML · CSS · JavaScript
- Built real-time collaborative drawing platform using Socket.io for low-latency bidirectional communication
- Features: freehand drawing, undo/redo, image export
- Demonstrates event-driven architecture — concepts applicable to live payment status updates and transaction notifications
🎓 B.Tech — Computer Science & Data Science
Gyan Ganga Institute of Technology and Sciences, Jabalpur · CGPA: 7.5/10 · 2024
☁️ AWS Academy Cloud Foundations — Amazon Web Services (Feb 2023)
🗄️ Database Programming with SQL — Oracle Academy (Jul 2022)
☕ Java Spring Boot — Udemy
🖥️ Programming Essentials in C and C++ (CLA) — Cisco NetAcad