Kazi Ridwan Arefin
Verified Expert in Engineering
Full-stack Developer
Dhaka, Dhaka Division, Bangladesh
Toptal member since September 12, 2022
Kazi is a full-stack software engineer with a decade of experience building high-performance, scalable web applications. He has a proven track record of successfully leading engineering teams in startups and large businesses, guiding them toward the client's vision of success. Kazi built products that significantly contributed to fundraising rounds and acquisitions by Fortune companies.
Portfolio
Experience
- JavaScript - 10 years
- Node.js - 8 years
- React - 7 years
- Express.js - 7 years
- React Apollo - 7 years
- GraphQL - 6 years
- Apollo Server - 5 years
- Tailwind CSS - 3 years
Preferred Environment
MacOS, Linux, Visual Studio Code (VS Code), Docker, Amazon Web Services (AWS)
The most amazing...
...project I’ve worked on is an eCommerce platform with 400,000 monthly users in the USA.
Work Experience
Senior Software Engineer
Joybird
- Designed and implemented a state-of-the-art micro frontend-based eCommerce website that accommodates 300+ modules and 2,000+ pages with React, Express.js, GraphQL, bash scripts, and Grunt.
- Created a custom server-side rendering architecture with Express.js for performance and search engine optimization, increasing the average session length by around 20% for over 500,000 unique monthly visitors.
- Implemented microservices to enhance user retention and upselling with Node.js and Neo4j, which resulted in approximately 15% more customer engagement.
- Contributed to the development of a dashboard toolkit featuring an A/B testing suite and modular components built with Node.js, increasing sales by 50-80% per year for four years straight and achieving 700,000 to one million monthly traffic gains.
- Engineered a holistic architecture for the analytics layer of the React components library with Amazon Kinesis and a custom Node.js library.
Software Engineer
V1 Worldwide
- Architected the design system of a highly modular, one-of-a-kind eCommerce system with maintainability and scalability in mind.
- Created the component library and data architecture POCs.
- Designed and co-created back-end APIs with Express.JS and GO (GopherJS).
- Implemented a React component library with a monorepo-like architecture that allowed the creation of modular building blocks for the web app and dockerized the services for local development.
- Designed and engineered a holistic architecture for the analytics layer of the React components library, with AWS Kinesis and a custom Node.js library.
Chief Technology Officer
Yakkyofy
- Led the development of dropshipping and sourcing platforms with React, Laravel, and Docker.
- Led the engineering team in the LUISS EnLabs acceleration program and secured over 500,000 USD in seed funds.
- Oversaw feature releases and coordinated with the product team for engineering direction.
Chief Technology Officer
SiteTrax
- Led the development of a React web application for the Construction Tech Group and succeeded in securing seed funds for the product.
- Created back-end services with Python on OpenCV to enable object detection and image stitching features for their top-selling product.
- Contributed to experimental POCs to create an EOS blockchain-based customer subscription utility.
Software Developer
Pixelizard Ltd
- Developed custom ERP and SaaS platforms using Laravel and Angular.
- Oversaw the front-end development team and acted as team lead with Angular and Bootstrap expertise.
- Collaborated with business development managers to extract client requirements and prepare project roadmap for the development and design team.
Experience
Product Sourcing Platform Built with React and Node.js
https://yakkyofy.com/WordPress Based Crowdfunding Web App
Technologies used: WordPress and Bootstrap CSS
SaaS Platform for Business Management
https://www.kundan.no/The platform's unique selling proposition is how easy it makes the cumbersome process of applying to various government processes through a modern UX.
I was the core contributor to one of the key features.
Education
Bachelor's Degree in Computer Science
BRAC University - Dhaka, Bangladesh
Skills
Libraries/APIs
React, Node.js, Stripe API, Stripe Connect, Stripe, Google Sheets API, Amazon Rekognition, OpenCV
Tools
React Apollo, Amazon Simple Queue Service (SQS), NGINX, Claude Agent SDK, AWS Command Line Interface (CLI)
Languages
GraphQL, JavaScript, CSS, HTML, PHP, TypeScript, Google Apps Script, Java, Go, Python 3
Frameworks
Tailwind CSS, Express.js, Next.js, Laravel, NestJS, Bootstrap, Angular, AngularJS, Ionic, Material UI
Platforms
AWS Lambda, Amazon EC2, Google Cloud Platform (GCP), Docker, Amazon Web Services (AWS), MacOS, Linux, Visual Studio Code (VS Code), WordPress
Paradigms
DevOps, UI Design, Object-oriented Programming (OOP)
Storage
Amazon S3 (AWS S3), MySQL
Other
APIs, Software Architecture, Team Leadership, Documentation, UI Development, Front-end, User Experience (UX), User Interface (UI), Full-stack Development, API Integration, Full-stack, Apollo Server, Amazon Route 53, Cloud Architecture, Large Language Models (LLMs), AI Automation, Agentic AI, Agentic AI Systems, Chrome Extensions, Deep Learning, AWS Marketplace, Remote Work
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