Welcome to my GitHub profile! I'm a Java Backend Engineer with nearly 5 years of professional experience designing, building, and optimizing scalable distributed systems, event-driven microservices, and enterprise fintech applications. I'm passionate about solving complex problems, building efficient systems, and contributing to innovative projects.
- 🎓 Education: B.Tech in Computer Science and Engineering (CGPA: 8.65) from Swami Keshvanand Institute of Technology, Jaipur (2018–2022)
- 💻 Professional Experience:
- Software Engineer at Paysecure Technology (Feb 2026 – Present): Building Trust Score microservice (Kafka-driven, Redis + MongoDB), migrating 20+ REST APIs for legacy monolith-to-React modernization, optimizing query latency by ~30%.
- Software Engineer at AppPerfect Corp. (Oct 2021 – Jan 2026): Owned 40+ microservices for Token.io (European Open Banking A2A payment gateway). Led Java 11→21 migration across all 40+ services with zero unplanned downtime. Achieved ~15% latency reduction on high-traffic endpoints. Established observability (Prometheus/Grafana/Elasticsearch), Flyway migrations, PCI-DSS compliance.
- Technical Team Lead Intern at Tech Exordium (Aug–Sep 2021): Led 5 developers, optimized Django queries by 25%, established Git branching strategy.
- Django Developer Intern at 3HandShake Innovation (May–Jun 2020): Built company website with reusable Django modules.
- Programming Languages: Java (11, 21), Python, C/C++
- Frameworks: Spring Boot, Django
- Architecture: Microservices, Distributed Systems, Event-Driven Architecture, REST API Design
- Messaging & Streaming: Apache Kafka (exactly-once semantics), Webhooks
- Databases: SQL (MySQL, MariaDB, Oracle), NoSQL (MongoDB, Redis)
- Observability & Ops: Prometheus, Grafana, Elasticsearch, Docker, Kubernetes
- Tools & Practices: Git, Maven, Gradle, Flyway, JUnit, CI/CD (GitHub Actions), Agile/Scrum, PCI-DSS Compliance
- Trust Score Service (Solo Ownership, Paysecure): Kafka-driven payment trust evaluation microservice with sub-100ms p99 latency. Async event consumption, Redis caching + MongoDB persistence, full observability stack, CI/CD to Kubernetes.
- Core Platform Backend Modernization (Paysecure): 20+ REST APIs for legacy monolith-to-React migration. 50+ optimized database interactions (30% latency reduction). Team-wide backend standards: centralized error handling, structured logging, automated testing.
- Token.io — Open Banking A2A Payment Gateway (AppPerfect): Corporate API Integration microservice (sole ownership). Java 11→21 runtime migration across 40+ services. Merchant dashboard backend APIs. Bank communication adapters (EBICS, SEPA), payout/refund orchestration. PCI-DSS compliance controls.
- 📧 Email: jainj2305@gmail.com
- 📱 Phone: +91 7300255262
- 🔗 LinkedIn: linkedin.com/in/jainj2305
- 💻 GitHub: github.com/jainj2305
Let's connect and collaborate to build something amazing together!
