Sankar

Senior Software Engineer

Xenovex Technologies Private Limited • Full-time

May 2024 - Aug 2026 • 2 yrs 3 mos

**Senior Software Engineer | Chennai Metro Rail Limited (CMRL) Project** - Designed and developed a secure QR-based digital ticketing platform, replacing traditional physical tokens with digitally signed QR tickets. - Developed and maintained 20+ Java Spring Boot microservices for ticket booking, validation, payments, reporting, and third-party integrations. - Designed REST APIs for ticket generation, validation, payment processing, and external service integrations. - Built a digital wallet (Stored Value Pass – SVP) supporting secure balance storage, recharges, and ticket purchases. - Developed lightweight Core Java applications for Raspberry Pi-based QR validation devices, optimized for low-resource hardware. - Implemented WebSocket communication for near real-time ticket validation and metro gate operations. - Developed and supported Linux-based device modules, including configuration and deployment. - Deployed and managed containerized microservices on Azure Kubernetes Service (AKS). - Improved performance through SQL optimization, caching, asynchronous processing, and efficient resource utilization. - Troubleshot production issues involving Kubernetes, JVM memory, databases, and distributed microservices. - Collaborated with mobile, infrastructure, payment, and third-party teams while contributing to CI/CD, code reviews, release management, and Agile delivery.

Software Engineer

Yuniq • Full-time

Jul 2021 - Apr 2024 • 2 yrs 9 mos

**Software Engineer | Healthcare & Customer Communication Platforms** Developed enterprise backend applications using Java, Spring Boot, and Microsoft SQL Server for healthcare case management and customer communication platforms. Designed REST APIs for patient workflows, provider integrations, and healthcare fund management. Integrated PDF generation and multi-channel communications, including Email, SMS, WhatsApp, Voice, and Fax. Built data migration pipelines using Apache NiFi and Kylo, optimized SQL queries, resolved production issues, and improved application performance. Collaborated with cross-functional teams using Git and Agile practices to deliver secure, scalable, and reliable solutions.