Abu bakar Siddique

I've built enterprise backend systems at Micro Data Tech Solution using Java and Spring Boot, designing scalable microservices and production-ready REST APIs.

I develop secure authentication with JWT and OAuth2, optimize database performance for high-load environments, and contribute to architecture and technical design decisions. I've also mentored junior team members while leading core backend modules.

I built Shadow Planner, a full-stack business planning application for scheduling, budgeting, expense tracking, and resource planning. Its Java and Spring Boot backend uses MySQL and PostgreSQL, JWT role-based access control, and RESTful APIs consumed by a React.js frontend.

I also built an FBR Digital Invoice system that generates tax-compliant sales invoices, calculates sales tax from FBR tax slabs, and integrates with FBR-compliant endpoints for invoice validation and processing.