Software Developer • Bangladesh

I craftdelightfulweb & mobileproducts.

Md Kawsar Islam Yeasin - Software Developer

01 / PORTRAIT

Hola, I'm Md Kawsar Islam Yeasin — Front-end-focused full-stack software developer with almost 2 years of experience, building scalable, responsive, and high-performance applications with clean code, problem-solving, and AI-driven workflows.

Resume / CV Hire me

2+Years shipping products

10+Client & freelance builds

622+GitHub stars earned

5+AI features in prod

TYPESCRIPT✳REACT & NEXT.JS✳REACT NATIVE & EXPO✳NODE.JS & BACKEND✳POSTGRESQL & MONGO✳AI AGENTS & LLMS✳TAILWIND CSS✳OPEN SOURCE✳PERFORMANCE 90+✳TYPESCRIPT✳REACT & NEXT.JS✳REACT NATIVE & EXPO✳NODE.JS & BACKEND✳POSTGRESQL & MONGO✳AI AGENTS & LLMS✳TAILWIND CSS✳OPEN SOURCE✳PERFORMANCE 90+✳TYPESCRIPT✳REACT & NEXT.JS✳REACT NATIVE & EXPO✳NODE.JS & BACKEND✳POSTGRESQL & MONGO✳AI AGENTS & LLMS✳TAILWIND CSS✳OPEN SOURCE✳PERFORMANCE 90+✳TYPESCRIPT✳REACT & NEXT.JS✳REACT NATIVE & EXPO✳NODE.JS & BACKEND✳POSTGRESQL & MONGO✳AI AGENTS & LLMS✳TAILWIND CSS✳OPEN SOURCE✳PERFORMANCE 90+✳

01 — Selected work

Things I've built lately.

Production web and mobile applications delivered for international clients and high-velocity startups. Every project opens into the technical story and live deployment.

Port a Vacation

Vacation rental & property management for USA client

01. PRODUCTION

Wiiz AI

AI-based job marketplace for German client

02. PRODUCTION

Glowmi.net

AI-powered skincare e-commerce (LTR & Arabic RTL)

03. PRODUCTION

Gift Guru & Mobile App

Cross-platform gifting & recommendation application

04. MOBILE & WEB

More production code and client builds in progress.Discuss your project

02Point of view

Not just code.
User delight.

I turn complex product requirements into clean, resilient software products that are fast enough to feel invisible, intuitive enough to need no manual, and architected to scale.

YEASIN
SOFTWARE
DEV
EST. 2024

03 — Experience

Where I've shipped things.

A track record of engineering fast, accessible web and mobile platforms with remote international teams and agile delivery cycles.

01Current

Teachfosys

Software Developer

Jul 2025 — PresentRemote

Integrating AI API endpoints, collaborating closely with backend developers, and leading end-to-end delivery of client software solutions.

—Integrated AI endpoints & streaming responses with reliable error recovery.
—Engaged directly with international clients to translate product requirements into technical roadmaps.
—Delivered 5+ client web platforms strictly following W3C accessibility and cross-browser standards.

Stack:Next.jsReactTypeScriptNode.jsMongoDBSentry

Neonency

Frontend Developer

Dec 2023 — Sep 2024Remote

Engineered responsive user interfaces and executed comprehensive performance optimizations across core web products.

—Optimized client-side rendering workflows and eliminated recurring unnecessary component re-renders.
—Boosted Lighthouse performance and accessibility scores by 10–20 points, consistently reaching 90+.
—Developed modular UI component libraries with scalable styling using Tailwind CSS and Redux.

Stack:ReactJavaScriptTailwind CSSReduxVercel

Independent

Open Source & Contract Engineer

2024 — PresentWorldwide

Building high-performance starter templates, contributing to ecosystem libraries, and delivering bespoke full-stack applications.

—Authored bulletproof-nextjs-starter and react-ts-starter, accumulating 330+ GitHub stars.
—Active contributor to popular open-source repositories including shadcn/ui and Skald.
—Designed full-stack and mobile client MVPs with automated CI/CD and strict TypeScript type safety.

Stack:TypeScriptNext.jsReact NativeExpoDockerTurborepo

04 — Toolbox & Capabilities

The stack I reach for daily.

From architectural planning to production deployment, high-velocity tools crafted for speed, type safety, and exceptional user experience.

TypeScript & JavaScript

Type-safe full-stack codebases, clean design patterns, and strict compiler standards across web and mobile.

React & Next.js

High-performance App Router, Server Components, dynamic streaming, and Lighthouse 90+ optimization.

React Native & Expo

Cross-platform iOS and Android applications with native device capabilities and polished micro-interactions.

Node.js & Backend APIs

Scalable REST APIs, Express, Nest.js, Bun runtime, background tasks, and real-time socket connections.

PostgreSQL, Mongo & Prisma

Relational and document schema modeling, ACID transactions, Prisma ORM migrations, and performant querying.

AI Endpoints & Agentic Workflows

Structured outputs, tool calling, Gemini & OpenAI integration, streaming UI, and agent-driven workflows.

Tailwind CSS & UI Systems

Accessible design systems, custom theme tokens, Radix / Base UI primitives, and responsive fluid styling.

DevOps & Monorepos

Turborepo build orchestration, Docker containers, GitHub CI/CD automation, Vercel edge, and Sentry monitoring.

Core Technologies

TypeScript

React

Next.js

JavaScript

Node.js

PostgreSQL

MongoDB

Prisma

Bun

05 — About me

Curious builder,
careful shipper.

Front-end-focused full-stack developer with almost 2 years of industry experience building web and mobile apps with TypeScript, React, Next.js, React Native, and Expo.

622+

GitHub stars across open-source work

I contribute actively to open source, leverage AI-driven development workflows, and partner closely with founders and engineering teams to deliver software that feels considered — not templated.

Specialization: Full-Stack Web & Mobile App Development with end-to-end type safety, modern CI/CD, and fast DX.

Focus Areas: TypeScript, Next.js App Router, React Native Expo, Node backend APIs, and structured LLM tool integration.

2+Years Exp

10+Shipped

48Repositories

06 — Open Source & Engineering