Dhaka, Bangladesh

S.M. KhalidMahmud

Software Engineer

Building scalable web and mobile products — from React Native and Next.js to NestJS APIs and PostgreSQL.

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About

Who I Am

I'm a software engineer passionate about building performant, reliable applications across web and mobile. I work with React Native for mobile apps, React and Next.js on the web, and NestJS, Node.js, and PostgreSQL on the backend — delivering features that make a real impact, from visa processing platforms to client management systems.

GitHub

Coding Activity

A snapshot of my open-source and project contributions on GitHub.

Skills

What I Work With

Frontend

CSSSASSBootstrapTailwindMaterial UIAnt DesignJavaScriptTypeScriptES6ReactReact RouterNext.jsTanStack QueryReduxAxios

Mobile

React NativeExpoTypeScriptREST API IntegrationMobile UI/UXNavigationState Management

Backend

Node.jsExpressNestJSREST APIsPostgreSQLMongoDBSupabaseStrapiAuthentication & AuthorizationDatabase Design

Tools

GitDockerDevTools & DebuggingFigmaPhotoshopIllustratorInDesign

Experience

Where I've Worked

Software Engineer L1

VISAThing

Jul 2024 – May 2026

Dhaka, Bangladesh

Contributed to the development and maintenance of VISAThing's visa processing platform, delivering end-to-end features across frontend and backend systems.

  • Built scalable backend services with NestJS and RESTful APIs for visa processing workflows.
  • Designed and optimized PostgreSQL schemas and queries for data integrity and performance.
  • Enhanced responsive UI components for visa application tracking with mobile-first design.
  • Improved system reliability through better error handling, validation, and API structuring.

Jr. Frontend Developer

UniClient Technologies

Nov 2023 – Jun 2024

Dhaka, Bangladesh

Contributed to the development and maintenance of the UniClient platform, enhancing usability and performance for businesses managing client relationships.

  • Built interactive, reusable UI components to improve user engagement and development efficiency.
  • Integrated RESTful APIs and managed state with TanStack Query for optimal performance.
  • Enhanced responsiveness and cross-browser compatibility across all devices.
  • Implemented accessibility improvements to ensure an inclusive user experience.

React Developer

JS Encoder

Oct 2023 – Nov 2023

Dhaka, Bangladesh

Developed React-based web applications, contributing to frontend architecture and component development.

  • Built and maintained React components following modern best practices.
  • Collaborated with the team to deliver features on tight timelines.

Writing

Recent Articles

Contact

Let's Connect

Open to new opportunities and collaborations. Feel free to reach out — I'd love to hear from you.