Open to senior roles and new projects

Hi, I'm Efazul Karim
Senior Full-Stack Engineer

Building scalable full-stack systems and automation-driven products for real-world businesses.

Schedule a Meeting View Projects

const developer = {

focus: [

'Full-stack systems','Automation & AI pipelines','Cross-platform mobile apps','Scalable APIs & data platforms'

stack: [

'Next.js / React','React Native','Node.js & .NET','Python / FastAPI','PostgreSQL'

principle: 'Build reliable systems that turn complex business workflows into production-ready software',

}

About Me

The developer behind the code

A bit about who I am, what I build, and the tools I reach for.

Open to work

~/efaz

Kazi Efazul Karim

Senior Full-Stack Engineer

My Journey

Senior full-stack engineer who architects and ships reliable, scalable systems that turn complex business workflows into production software. I own the path to production — React, Next.js, and React Native on the front; Node.js, Python, and .NET APIs and data platforms behind them; plus testing, cloud, and deployment.

I work end-to-end — React, Next.js and TypeScript on the front, React Native for cross-platform mobile, and robust APIs, microservices and databases with Node.js and Python behind them. I care about clean, maintainable code and interfaces that feel effortless on every platform.

// currently working with

ReactNext.jsReact NativePythonNode.jsDocker

Years building

Projects shipped

Technologies

View Resume Contact

Skills & Expertise

Technologies and tools I use to build scalable backend systems and automation workflows.

Frontend

React, Next.js, TypeScript
Tailwind CSS, Framer Motion
Accessible, responsive UI systems
RSC / App Router patterns

Backend

Node.js, Python, .NET / C#
REST & GraphQL APIs, Webhooks
Auth, RBAC & background jobs
Scalable data models & query tuning

Mobile Apps

React Native, Expo
Cross-platform iOS & Android
Native modules, push notifications
Secure auth & offline storage

DevOps / Infra

Docker, K8s, AWS, Azure
CI/CD with GitHub Actions
VPS & Nginx deployment
Monitoring & logging

Automation & AI

n8n / custom pipelines
LLM APIs (OpenAI-compatible)
Automation Bots
Document & Report Automation

Architecture & Scale

System design & microservices
Clean Architecture / CQRS / DDD
Caching, queueing & background jobs
Testing strategy & observability
Code review & mentorship

Work History

Professional Experience

A showcase of my professional journey and the skills I've developed along the way.

Senior Full-stack Product Engineer

Full-time

Apr 2022 - Present

Fasten Teams (Formerly BitSic)•

Remote

Senior full-stack engineer building software for startups and founders — owning architecture and end-to-end delivery of full-stack web, mobile, and AI-assisted products for clients.

ReactReact NativeNext.jsTypeScriptNode.jsPythonDjangoExpress.jsMySQLPostgreSQLMongoDBREST APIGraphQLSoftware DesignObject-Relational Mapping (ORM)Tailwind CSSDockerAWS

Senior Full-Stack Engineer

Contract

Jun 2024 - Jan 2026

Fionetix•

Remote

Senior full-stack engineer contracting with product teams on high-leverage web, mobile, and data initiatives in parallel with my full-time role at Fasten Teams.

ReactReact NativeNext.jsTypeScriptNode.jsPythonExpress.jsMySQLPostgreSQLSoftware DesignTailwind CSSREST APIGitDocker

Freelance Developer & Consultant

Contract

Jan 2020 - Mar 2022

Self-employed•

Remote

Provided end-to-end web and mobile development services for diverse clients across multiple industries. Built custom software solutions, e-commerce platforms, and business applications with focus on scalability and user experience.

ReactNext.jsReact NativeTypeScriptNode.jsPythonDjangoExpress.jsPostgreSQLMongoDBREST APITailwind CSSGitProject ManagementClient CommunicationTechnical Consulting

Academic Journey

Education

The academic and self-taught foundations behind my engineering practice.

Bachelor of Science - BSc, Computer Science and Engineering

Southeast University

Dhaka, Bangladesh

Focused on algorithms, data structures, software engineering, and AI — the foundations I apply daily to production systems.

Full Stack Development, Computer Science

freeCodeCamp

Online

Built a practical foundation in full-stack development with hands-on React, Node.js, and database projects.

Featured Projects

Here are some projects I've worked on that showcase my skills and approach to problem-solving.

Project

Completed

Education Management System

A comprehensive SaaS platform for educational institutions designed to streamline administration, academics, and communication across admissions, attendance, exams, fees, payroll, SMS, documents, and a public Web CMS.

Client:6 schoolsRole:Lead full-stack architect

ReactTypeScriptTailwind CSSZustandExpress.js+3

schools onboarded

3,000+

users supported

250+

documented APIs

View Details

Project

Completed

Litigation Management System

A production-grade litigation management platform for banks and financial institutions to manage cases, borrowers, documents, security arrangements, approvals, reporting, and audit trails at branch scale.

Client:Bank / financial institutionRole:Full-stack product engineer

.NET 9ASP.NET CoreEF Core 9SQL ServerReact 19+12

124

branches covered

5,000

alerts per day

domain areas

Demo View Details

Project

Completed

WordRizz - AI Powered Vocab App

A comprehensive vocabulary learning mobile application featuring smart word search with autocomplete, curated word pack subscriptions (IELTS, GRE, SAT), interactive quizzes, analytics dashboard for progress tracking, community feed, reviews and ratings, dark mode, multi-language support with i18next, and JWT-based secure authentication with MMKV storage.

Client:Consumer mobile appRole:Sole mobile engineer

React NativeTypeScriptJavaScripti18nextMMKV+4

word-pack tracks

mobile screens

languages ready

View Details

See All Projects

What clients say

Trusted to Deliver

Feedback from founders and product teams I've worked with.

“Efaz took a messy, spreadsheet-run operation and turned it into a platform our whole school network relies on daily. The handoff quality and API docs were a huge time-saver for our team.”

Product Lead

Client · Education SaaS

“He owned everything from architecture to deployment and communicated clearly at every step. The maker-checker and audit work gave our compliance team exactly the confidence we needed.”

Tech Stakeholder

Client · Banking Platform

“Reliable, fast, and collaborative. Efaz shipped a polished cross-platform app that our users genuinely enjoy — and he was a true partner on product decisions, not just a ticket-taker.”

Founder

Client · Mobile Product