● Developed and maintained high-performance web and mobile applications using Java and Spring MVC, implementing SOLID principles, Factory and Singleton Design Patterns, and clean coding practices to ensure extensible and maintainable codebase.● Architected and implemented RESTful and SOAP APIs using OpenAPI specifications, optimizing microservices communication with load balancing and rate limiting via API Gateway and improving reliability with circuit breaker patterns.● Led the integration of a bill payment system within a distributed microservices architecture, implementing Redis for in-memory caching, which enhanced the platform’s scalability and reduced latency by 30%.● Enhanced user management workflows by implementing role-based access control (RBAC) with JSON Web Tokens (JWT) for secure authentication and LDAP for centralized user management, reducing support tickets by 20%.● Created modular, responsive UI components using Google Web Toolkit (GWT), AJAX, and asynchronous JavaScript to optimize client-server communication, improving performance and cross-browser compatibility.● Integrated Onfido’s identity verification API with OAuth 2.0, implementing a secure, GDPR-compliant document verification system that streamlined KYC (Know Your Customer) processes and enhanced platform security.● Designed and developed an administrative portal for managing debit terminals and kiosks using Kotlin, TypeScript, and Spring Boot, employing Thymeleaf for dynamic HTML rendering and Bootstrap for responsive design, providing administrators with an intuitive control interface.● Contributed to the development of a dynamic React application, leveraging Redux for state management and Apollo Client for efficient GraphQL API integration, optimizing data loading and reducing latency by 15%.

● Developed a high-traffic e-commerce platform leveraging React.js, Java, Spring, Hibernate (with Redux for state management) and Node.js on the backend, optimizing performance and responsiveness, increasing customer engagement and reducing page load times by 25%.● Implemented real-time communication features using WebSocket with Express.js and Socket.io, enabling bidirectional messaging between users and support teams, improving real-time support capabilities and boosting customer satisfaction by 25%.● Architected and deployed a serverless microservices architecture using AWS Lambda, API Gateway, and DynamoDB, significantly reducing operational costs by 20% while improving scalability and deployment flexibility.● Led efforts in database optimization, leveraging MongoDB with Mongoose for efficient data storage and retrieval, incorporating indexing strategies and query optimization to improve performance by 30%.

● Designed and developed an internal project management tool using React.js with Redux and Spring Boot, integrating RESTful APIs to streamline task management and enhance real-time updates, resulting in a 30% increase in project completion efficiency.● Created an automated testing framework using Python for cross-browser testing, significantly reducing testing cycles by 70% and ensuring consistent quality across all major browsers.● Developed a robust data analytics dashboard using D3.js for dynamic data visualization, empowering stakeholders to make data-driven decisions, improving reporting efficiency by 50%.● Enhanced application security by implementing OAuth 2.0 and Spring Security for secure authentication and authorization, reducing unauthorized access attempts by 40%.● Integrated third-party payment gateways (STRIPE API) for secure, PCI-compliant transactions, reducing payment failures by 15% through proactive error handling and system optimizations.● Led the implementation of a CI/CD pipeline using GitLab CI/CD, automating unit tests, build processes, and deployment, reducing deployment-related issues by 30%.● Engaged in Agile development practices, participating in sprint planning, daily stand-ups, and retrospectives, utilizing JIRA for project tracking, resulting in improved communication and efficiency across teams.