Open to opportunities

Mister kumar roy Mister kumar roy

@misterkumarroymister

Message

Full Stack Engineer building scalable web and mobile apps with Node and React.

India

Message

What I'm looking for

I’m looking to build secure, scalable production products end-to-end—React + Node backends, robust APIs, AWS deployments, and automation with AI agents—working in an Agile team where I can own features and ship reliably.

I’m a Full Stack Engineer with 3+ years of experience architecting and shipping production-grade web applications, mobile apps, and RESTful backend services.

I build across the stack with Node.js (Express/Fastify), React.js, React Native (Expo), and PostgreSQL, and I’m comfortable working with MySQL, MongoDB, and Redis. I focus on secure systems and reliable APIs through JWT authentication, RBAC, and microservices design.

At Knowe Digitech Pvt Ltd, I architected end-to-end React.js + Node.js + PostgreSQL applications, implemented JWT + RBAC across products, and optimized PostgreSQL/MySQL schema and queries to improve API response times. I’ve also deployed and supported production systems on AWS and collaborated in Agile sprints to deliver on time.

I’m equally motivated by automation and AI—integrating AI agents and LLM API workflows (including n8n) and using prompt engineering to build practical solutions. I enjoy owning features from UI to backend and shipping with CI/CD and strong developer workflows.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer

Current

Knowe Digitech Pvt Ltd

Nov 2024 - Present (1 year 8 months)

Architected and shipped end-to-end web applications using React.js, Node.js, and PostgreSQL, including UI, REST APIs, authentication, and AWS cloud deployment. Built JWT-based authentication and RBAC, and optimized database schemas and queries to improve API response times.

React PostgreSQL REST APIs Authentication JWT RBAC Fastify Microservices AWS Query Optimization CI CD

Full Stack Developer

Probey Services Pvt. Ltd

Apr 2024 - Nov 2024 (7 months)

Contributed across the full development lifecycle, building React.js frontends and Node.js backend services with PostgreSQL and third-party API integrations. Led data-driven web app development using React.js and Redux to improve page load performance and user retention.

React Redux Node.Js Development PostgreSQL API Integration Component Libraries Responsive UI

Software Developer

CRM Travels Private Limited

Jul 2023 - Apr 2024 (9 months)

Co-developed a Travel CRM platform using PHP/Laravel and MySQL to streamline booking workflows and customer lifecycle management for the sales team. Delivered scheduled features, supported production deployments in an Agile environment, and built additional SaaS modules to improve client retention.

PHP Laravel MySQL Agile Delivery

Education

Degrees, certifications, and relevant coursework

Admec Multimedia Institute, Delhi

Diploma in Full Stack Web Development, Full Stack Web Development

2022 - 2023

Grade: GPA: 7.2

Activities and societies: Coursework: HTML, CSS, JavaScript, React, PHP, Laravel, Adobe XD, Figma

Completed a Diploma in Full Stack Web Development covering HTML, CSS, JavaScript, React, and PHP/Laravel. Also studied Adobe XD and Figma.

LNMU, University, Darbhanga

Bachelor of Arts, English Literature

2020 - 2023

Grade: GPA: 6.8

Activities and societies: Coursework: communication, documentation, analytical reasoning; applied to API docs & client collaboration

Earned a Bachelor of Arts in English Literature from LNMU, Darbhanga. Built skills in communication and analytical reasoning, including applying documentation for API docs and client collaboration.