Manish Kumar

Full-Stack Developer with 10+ years of experience designing scalable enterprise applications using .NET Core (5–8), C#, Microservices, SQL, and cloud platforms (Azure, AWS). Proven track record in API optimization, performance tuning, and multi-tenant architectures. Complemented by strong frontend expertise in React.js, Redux, building responsive, user-friendly interfaces integrated with robust backend services.

Recognized for delivering end-to-end solutions that improve system performance, enhance user experience, and drive measurable business impact.

Principal Software Engineer - Ultimate Kronos Group - Noida, India

(2025-09)

• Optimized API performance - achieving a 50% reduction in response time and CPU usage through targeted refactoring and efficient resource management.
• Spearheaded performance tuning for critical APIs, resulting in 50% improvement in execution speed and system resource utilization.
• Implemented architectural enhancements and caching strategies that halved API latency and CPU consumption.
• Developed React.js dashboards for real-time API monitoring, integrating Chart.js and backend metrics to visualize latency, throughput, and error rates.
• Implemented role-based UI components in React.js with JWT authentication, ensuring secure access to sensitive API data.

Project Leader - R System International - Noida, India

(2024-06 - 2025-08)

• Designed and implemented RESTful APIs for the 'Organization' module ensuring robust functionality and flexibility.
• Implemented migration of SOAP to REST API with improved performance, resulting in a rapid increase in the client's buyer base by over 25–30%.
• Developed REST APIs for user registration, login, and user profile management, incorporating various CRUD operations for enhanced user experience.
• Provided prompt and sustainable solutions for bugs and issues encountered in the production environment, ensuring smooth operation of the system.
• Built React.js forms for user registration and profile management, integrated with .NET Core APIs using Axios, and implemented Redux for consistent state management across modules.
• Enhanced UI responsiveness with React hooks and lazy loading, reducing initial page load time by 30%.

Senior Engineer 2 - IOMEDIA India Private Limited - Gurgaon, India

(2024-01 - 2024-05)

• Designed and implemented RESTful APIs for the 'Organization' module ensuring robust functionality and flexibility.
• Provided prompt and sustainable solutions for bugs and issues encountered in the production environment, ensuring smooth operation of the system.
• Developed React.js UI for organization data visualization, consuming microservice APIs and rendering dashboards with dynamic filters and pagination.
• Implemented error boundaries and logging in React.js to capture frontend exceptions and forward them to backend monitoring services.

Senior Software Engineer - Pitney Bowes India Pvt Ltd - Noida, India

(2016-03 - 2024-01)

• Reviewed project specifications and designed technology solutions that met performance expectations.
• Wrote highly maintainable, solid code for a software system, forming code framework and earning consistent praise from subsequent developers.
• Upgraded legacy code with latest framework versions and analyzed various performance bottlenecks in the project, implementing solutions.
• Collaborated with software development and testing teams to design and develop robust solutions to meet client requirements for functionality, scalability, and performance.
• Implemented security measures to protect APIs from common threats and optimized performance to ensure fast response times and scalability.
• Built React.js dashboards for Fulfillment workflows (inbound/outbound shipping, inventory tracking), integrating WebSockets for real-time order status updates.
• Developed responsive React.js UI for Instant Online Postage, enabling PayPal/eBay clients to generate shipping labels with live validation and error handling.

Master of Computer Application - Computer Application - Uttar Pradesh Technical University (2013-06)