Karthick K.

Hi, I’m Karthick Kumar — a Senior Full Stack Developer with 6+ years of experience building scalable, high-performance web applications using React.js, .NET Core (3.1, 6, 8), and SQL Server. I specialize in developing full-stack solutions, enterprise integrations, EDI workflows, and modern UI/UX interfaces. I deliver production-ready code, clean architecture, and seamless API integrations for startups and enterprise clients. Core Technical Expertise Frontend: React.js, Redux Toolkit, JavaScript ES6+, React Hook Form, MUI, Bootstrap, HTML5, CSS3 Backend: .NET Core (3.1/6/8), Web API, C#, Entity Framework Core, LINQ Database: SQL Server Auth: JWT, OAuth 2.0, ASP.NET Identity DevOps & Tools: Git, Azure DevOps, Postman, Swagger, Docker, CI/CD Others: RabbitMQ, Agile/Scrum, MVC, REST APIs Key Project Experience 1. EDI Integration & Canonical JSON Validation (.NET 8, SQL Server, RabbitMQ) Built an end-to-end EDI translator processing inbound and outbound X12 files. Implemented pipelines to fetch EDI from trading partners, convert EDI ↔ JSON, validate with Canonical Models, and integrate with ERP systems such as Order Management and QuickBooks. Built partner-specific mappings, lookup validations, staging tables, error workflows, and message queues for automated EDI operations (850, 855, 856, 940, 945, 810). 2. ARC Pay & ARC Invoice Systems – Financial Automation Developed enterprise modules for invoice generation, customer billing, and payment tracking. Built secure Web APIs (similar to Zoho Billing), optimized SQL performance for large datasets, and contributed to CI/CD, sprint planning, and release management. 3. Order Management System – Shipping Integration Integrated FedEx and UPS APIs for automated label generation, shipment creation, and real-time tracking. Implemented fallback mechanisms, improved delivery tracking UI, and optimized backend logic for logistics workflows. 4. Orchestr8 – Project Management Platform (Similar to Jira) Built core features for a task-tracking system supporting tickets, sprints, dashboards, time logs, and authentication. Developed full-stack modules using React, Redux Toolkit, .NET 6/8, SQL Server, and Azure hosting. Helped design workflows, improve UI/UX, and ensure smooth multi-role access. 5. Warehouse & Inventory Management (H&M Distribution) Created modules for warehouse operations, inventory tracking, stocking, order fulfilment, and logistics using ASP.NET Core MVC, SQL Server, and jQuery. 6. Inventory Billing System (Retail) Developed a billing & inventory application for Apple Sales & Services using .NET Core MVC, Razor, SQL Server, and Bootstrap. 🎯 Strengths Excellent at API integration (REST, Shipping APIs, EDI systems) Strong problem-solving & debugging skills Quick learner with enterprise delivery experience Works comfortably in daily stand-ups and Agile teams Clean code, reusable components, scalable architecture