Shalin L
Senior Backend Developer | PHP · Node.js · Python | 7 Years Experience
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About
Backend developer with 7 years of experience designing and scaling PHP and Node.js systems in production. Built and optimized APIs handling 3,000+ requests per minute, reduced query response times by up to 78%, and shipped secure, multi-tenant applications for MEP, food-tech, and CRM domains. Deep expertise in MySQL performance tuning, RESTful API design, AWS services, and security best practices (OWASP). Comfortable owning backend architecture end-to-end — from database schema to deployment.
Experience
Backend Developer at Links4Engg Pvt Ltd (2021-07 – Present)
- Architected and maintained high-availability backend systems serving 3,000+ requests/min using PHP, CodeIgniter, and MySQL
- Reduced database query execution time by approximately 78% through indexing strategies, query restructuring, and eliminating redundant queries.
- Designed and delivered RESTful APIs consumed by web and mobile clients, with full Swagger/OpenAPI documentation
- Implemented end-to-end security layer: token-based authentication, MFA, RBAC, OWASP-aligned input sanitization, and SQL injection / XSS / CSRF protections
- Integrated AWS S3 for file storage and AWS STS for temporary credential management, securing file access across a multi-tenant application
- Built a shift-aware workload tracking engine supporting multi-day tasks, carry-forward logic, and leave adjustments for 100+ engineers
- Integrated third-party payment gateways and external APIs; configured background cron jobs for automated email and data sync workflows
- Collaborated closely with frontend (React) and QA teams to ship features on schedule in a cross-functional agile team
- Collaborated with clients to gather requirements, conducted product demonstrations, and coordinated with cross-functional teams to deliver production-ready solutions.
Software Developer at TIBS Software LLC (2019-05 – 2021-06)
- Built and maintained dynamic web applications in PHP and MySQL, focusing on performance and reliability
- Designed RESTful APIs and integrated third-party services including payment gateways and SMS providers
- Developed and customized WordPress-based platforms with bespoke theme and plugin development for 5+ client projects
- Contributed full-stack across HTML, CSS, and JavaScript to deliver responsive, cross-browser interfaces
Education
Bachelor of Engineering in Computer Science – Anna University (2012)
