The full engineering record.

Engineered low-latency systems stabilizing a news platform under 6,000–8,000 peak concurrent users — eliminating N+1 query bottlenecks and cutting API latency ~50% with a custom Redis caching layer.

Built at TechnoNext Software Ltd

• → 8,000+ peak concurrent users stabilized
• → ~50% API latency reduction via Redis caching
• → Reflection-based audit logging across all entities, zero boilerplate

• Java
• Spring Boot
• PostgreSQL
• Redis
• Hibernate/JPA

Engineered event-driven ingestion pipelines — Spring Batch + Kafka — processing millions of vendor catalog records daily, with gRPC for sub-second internal communication and AOP-based CQRS for dynamic read/write routing.

Built at TechnoNext Software Ltd

• → Millions of records processed daily
• → Fault-tolerant, admin-approval ingestion workflows
• → Sub-second internal comms via gRPC

• Java
• Spring Batch
• Apache Kafka
• gRPC
• CQRS

Architected a full Clean Architecture backend — sole-owned across 2 major releases — for a B2C digital business card system, securing every endpoint with JWT/OAuth2 + RBAC and integrating real-time FCM alerts with automated ERP sync.

Built at TechnoNext Software Ltd

• → Sole backend owner — 2+ years, 2 major releases
• → NFC scan → intelligent deep-link routing (app or web fallback)
• → Automated ERP data-sync pipelines

• Java
• Spring Security
• Clean Architecture
• Firebase FCM
• OAuth2 / JWT

Built a complex pilot/crew scheduling module enforcing strict international duty-time compliance, with PostgreSQL schema design and validation flows handling thousands of concurrent scheduling permutations.

Built at TechnoNext Software Ltd

• → Thousands of concurrent scheduling permutations validated
• → International duty-time compliance enforced

• Java
• Spring Boot
• PostgreSQL

Production-hardened an internal Applicant Tracking System and built a real-time tool integrating Google TTS/STT with WebSocket multi-session concurrency.

Built at TechnoNext Software Ltd

• Java
• Spring Boot
• WebSockets
• Google TTS/STT

News aggregation and digest platform pulling live stories from multiple providers with Virtual Threads, extensible via Strategy/Template Method patterns, with TTL caching, provider health monitoring, and AI summarization.

• Java 25
• Spring Boot
• Virtual Threads
• Design Patterns
• Tailwind CSS

Spring Batch system that streams million-row CSV datasets through configurable column-level PII sanitization (masking, SHA-256 hashing, randomization) with restartable chunked jobs, audit history, and a diff-preview UI.

• Java
• Spring Boot
• Spring Batch
• SHA-256
• Docker
• AWS S3

Secure fintech wallet backend with a ledger-first, double-entry architecture — immutable append-only records, RS256 JWT, AES-256 PII encryption, Redis rate limiting, and atomic P2P transfers under strict isolation.

• Java 17
• Spring Boot 3.2
• Spring Security
• Redis
• TestContainers
• OpenAPI

Real-time WebSocket chat application demonstrating low-latency messaging, concurrency, and session handling.

• Java
• WebSockets
• Concurrency

Music recommendation backend that aggregates trending data from Spotify, Last.fm, and iTunes in parallel with Java Virtual Threads and structured concurrency, ranking tracks with a weighted mood/popularity/recency model.

• Java 25
• Spring Boot 3.4+
• Virtual Threads
• Caffeine
• Spotify API
• Last.fm API

Systems Integration: a high-integrity automation platform for shared living, coordinating a Spring Boot backend with a TypeScript frontend to track meals, expenses, and duties end-to-end.

• Java
• Spring Boot
• TypeScript