Hamza is available for hire
Hire HamzaHamza Ahmed
Verified Expert in Engineering
React Developer
Karachi, Sindh, Pakistan
Toptal member since September 14, 2021
Bio
Hamza is a diligent software engineer with 6+ years of experience in commercial application development. Throughout his previous experiences, he ensured 98% on-time project completion and recognized and managed a considerable cycle bottleneck that helped coding effectiveness. With a primary interest in front-end development, Hamza's joined Toptal to build innovative and cutting-edge business solutions for the great set up of customers inside its worldwide reach.
Portfolio
Stampline LLC
TypeScript, PostgreSQL, Stripe API, Next.js, React, Node.js, API Integration...
Blooming Box Gifts LLC
Node.js, React, Next.js, MongoDB, Tailwind CSS, Full-stack, Microservices...
Sucasa Finance Pty LTD
React, React Redux, TypeScript, Tailwind CSS, Responsive Web Apps, Storybook...
Experience
- React - 8 years
- JavaScript - 6 years
- Express.js - 6 years
- Node.js - 6 years
- Next.js - 4 years
- ECMAScript (ES6) - 3 years
- GraphQL - 2 years
- TypeScript - 2 years
Work Experience
Senior Full-stack (Next.js) Engineer
2026 - 2026
Stampline LLC
- Shipped V1 on Next.js 16 and Supabase Postgres, with row-level security covering both individual and team accounts.
- Built a Claude-powered pipeline that researches a recipient's company and drafts the card copy, with models and prompts configurable from the database.
- Integrated the IgnitePost fulfillment API for robot handwritten cards, including artwork generation and delivery status mapping.
- Made Stripe webhooks the source of truth for subscription and card credit state across Checkout, upgrades, and the customer portal.
- Added QR tracking on every card to capture engagement events, instrumented with Sentry and PostHog.
Technologies: TypeScript, PostgreSQL, Stripe API, Next.js, React, Node.js, API Integration, Tailwind CSS, SaaS, Minimum Viable Product (MVP), Software as a Service (SaaS), Stripe, Stripe Subscriptions, APIs, Full-stack, Full-stack Development, Vercel, Stripe Connect, Supabase, Claude API, Claude Code, Sentry, QR Codes, Architecture, Databases, Artificial Intelligence (AI), AI Engineering, Python
Senior Full-stack Lead Developer
2024 - 2026
Blooming Box Gifts LLC
- Enhanced the current app to support the KSA launch with multiple languages and currencies.
- Revamped the Orders dashboard and enhanced the experience for the operations team users.
- Launched the Market feature, where users can buy products in bulk.
Technologies: Node.js, React, Next.js, MongoDB, Tailwind CSS, Full-stack, Microservices, TypeScript, Kubernetes, Amazon Web Services (AWS), Pixel Perfect, Responsiveness, Webhooks, Google Cloud Platform (GCP), NestJS, Redis, Containerization, React Native, User Experience (UX), User Interface (UI), Shadcn, RTL, Sentry, React Hooks, RabbitMQ, Cron, Dashboards, QR Codes, Payment Gateways, Performance, Security, Payments, Microservices Architecture, Back-end Development, Figma, Claude, Claude Code, Debugging, Software, Software Development, RESTFul APIs, Artificial Intelligence (AI), Third-party APIs, Card Payments, Stripe, Mongoose, MERN Stack, Databases
Senior Front-end Developer
2024 - 2024
Sucasa Finance Pty LTD
- Spearheaded the development of the front end for a rapidly growing VC-backed startup, facilitating a 120% increase in user acquisition through streamlined user account creation processes.
- Engineered a user account creation page, resulting in a 20% reduction in bounce rates, enhancing user experience and driving engagement.
- Utilized React, Redux, and Tailwind CSS to deliver front-end components, contributing to a 30% improvement in page load times and overall site performance.
- Implemented state management solutions, resulting in a 15% decrease in application crashes and improved data integrity.
- Conducted thorough testing protocols, resulting in a 90% reduction in bug occurrences and ensuring the delivery of a robust and high-quality software product.
- Leveraged TypeScript to enforce strong typing, reducing development errors by 50% and enhancing code maintainability.
- Maintained pixel-perfect design implementation, resulting in 100% consistency across devices and screen sizes.
- Collaborated effectively within a cross-functional team, contributing to a 20% increase in team productivity and project velocity.
Technologies: React, React Redux, TypeScript, Tailwind CSS, Responsive Web Apps, Storybook, Application State Management, React Hook Form, Zod Schema, Flexbox, Responsive UI, ESLint, Pixel Perfect, Responsiveness, Webhooks, User Experience (UX), User Interface (UI), Sentry, React Hooks, Dashboards, Payment Gateways, Performance, Security, Payments, Figma, Debugging, Software, Software Development, RESTFul APIs, React Native, Shadcn UI, Third-party APIs, Card Payments, Databases, Software as a Service (SaaS)
React/Next.js Front-end Engineer
2024 - 2024
Mood Product Group LLC
- Contributed to fixing various UI-related issues with the storefront using a design system built with Panda CSS.
- Developed the Mood Storefront blog component that helped the client generate over 100+ educational materials for their users.
- Helped the client expedite their release before reaching their deadline at least two days in advance.
Technologies: React, Next.js, Vercel, Monorepos, API Integration, Application State Management, Contentful, Design Systems, Flexbox, TypeScript, React Server Components, Responsive UI, ESLint, Pixel Perfect, Responsiveness, Webhooks, User Experience (UX), User Interface (UI), Shadcn, Sentry, React Hooks, Dashboards, Payment Gateways, Performance, Payments, Figma, Debugging, Software, Software Development, RESTFul APIs, React Native, Databases
Full-stack Developer
2023 - 2023
ElectriCity Tech Ltd.
- Enabled Stripe card payment APIs to subscribe different servers.
- Automated the build and deployment process for continuous development and deployment.
- Fixed various issues, including the front and back end.
- Enabled Socket.io for user chat to converse in real-time.
Technologies: JavaScript, Node.js, React, APIs, Amazon Web Services (AWS), PM2, Stripe, Card Payments, MongoDB, Mongoose, TypeScript, Material Design, CI/CD Pipelines, Socket.IO, MERN Stack, Stripe API, Express.js, Redux, WebSockets, Context API, Manual QA, QA Testing, Application State Management, Responsive Web Apps, Leadership, Code Review, Full-stack Development, Responsive UI, ESLint, Shadcn, React Hooks, Dashboards, Payment Gateways, Performance, Fastify, Security, Back-end Development, Debugging, Software, Software Development, RESTFul APIs, Architecture, Third-party APIs, Databases
Full-stack Developer
2021 - 2023
PocketMade LLC
- Developed a multitenant-like eCommerce website for Ayr Wellness, which focuses on cultivating, manufacturing, and dispensing cannabis and cannabis-derived products.
- Used Next.js with TypeScript and Tailwind CSS for the front end.
- Used Strapi CMS and integrated GraphQL APIs for communication.
- Created Strapi plugins and synced services and data from Dutchie, the leading technology partner for cannabis retailers of all sizes.
- Worked on the website for Liberty Health Sciences, Florida's friendliest medical marijuana dispensary committed to providing patients a trusted, high-quality experience across the sunshine state.
- Contributed to the whole project from start to finish, working on design and implementation.
- Integrated Meili Search—an open-source, lightning-fast, and hyper-relevant search engine that fits effortlessly into your apps, websites, and workflow—for a delightful search experience in a snap.
Technologies: React, JavaScript, TypeScript, CSS, HTML, Node.js, Next.js, Algolia, GraphQL, Tailwind CSS, Git, HTML5, Front-end, GitHub, APIs, Front-end Development, eCommerce, Full-stack, Strapi, Headless Software, Content Management Systems (CMS), HTML5 Video, Responsive Web Design (RWD), REST, Jest, Storybook, Cypress, React Redux, Redux Toolkit, Vercel, User Interface (UI), CI/CD Pipelines, SQL, User Experience (UX), Back-end, Test-driven Development (TDD), Testing, SCSS, API Integration, Sass, React Router, API Development, Search Engine Optimization (SEO), PostgreSQL, Redux, Accessibility, Kubernetes, Front-end Design, Front-end Architecture, Unit Testing, Amazon S3 (AWS S3), Application State Management, Responsive Web Apps, Code Review, Flexbox, React Server Components, Full-stack Development, Responsive UI, ESLint, Responsiveness, Webhooks, Containerization, Shadcn, React Hooks, Dashboards, Payment Gateways, Performance, Payments, Back-end Development, Figma, Debugging, Software, Software Development, RESTFul APIs, Third-party APIs, Card Payments, Databases
Team Lead | Front End
2018 - 2021
FWU AG
- Acted as the team lead for FILOS' client-side application developed using React, Node.js, Express.js, and Material UI. This is a B2B application.
- Added PWA capabilities to FILOS so users can easily install our application on mobile and desktop devices.
- Developed FILOS with multi-tenant architecture and full customization using CSS variables and reusable components. Instead of hard-coded forms, I created dynamic forms by parsing JSON.
- Implemented the CI/CD lifecycle using GitLab and Jenkins.
- Mentored and guided technical team members in all project activities, assigning tasks, getting updates from team members, and tracking the project progress using Jira.
Technologies: Node.js, Express.js, Service Workers, React, PWA, Material UI, JavaScript 6, Redux, JSON Web Tokens (JWT), GitLab CI/CD, Jenkins, Jira, Web Development, ECMAScript (ES6), REST APIs, HTML, Git, HTML5, Front-end, GitHub, APIs, Front-end Development, Full-stack, Webpack, Responsive Web Design (RWD), REST, React Redux, Redux Toolkit, Docker, User Interface (UI), JavaScript, CI/CD Pipelines, SQL, User Experience (UX), Back-end, Test-driven Development (TDD), Technical Leadership, Testing, SCSS, Babel, DevOps, API Integration, NoSQL, Sass, Axios, React Router, API Development, Material Design, Front-end Design, Front-end Architecture, Unit Testing, Progressive Web Applications (PWAs), Manual QA, QA Testing, Application State Management, Responsive Web Apps, Leadership, Flexbox, Internationalization, Localization, i18n, i18next, Translation, Full-stack Development, SaaS, Responsive UI, ESLint, Responsiveness, RTL, React Hooks, Security, Back-end Development, Debugging, Software, Software Development, Architecture, B2B, Databases, Software as a Service (SaaS)
Full-stack Developer
2018 - 2019
LIVABLE, Inc
- Developed multiple interconnected portals for Livable, Inc using the Meteor framework with React and MongoDB.
- Designed and developed APIs with publish-subscribe patterns using Meteor and MongoDB.
- Migrated all portals from the React.createClass component declaration to ES6 class component declaration.
- Ensured responsiveness of all portals using Bootstrap.
Technologies: React, Bootstrap, MongoDB, Meteor, Web Development, REST APIs, HTML, Git, HTML5, Front-end, GitHub, APIs, Front-end Development, Full-stack, HTML5 Video, Responsive Web Design (RWD), REST, Jest, User Interface (UI), JavaScript, Styled-components, User Experience (UX), Back-end, Test-driven Development (TDD), Testing, Babel, Microservices, DevOps, API Integration, NoSQL, React Router, API Development, MERN Stack, Stripe API, Redux, Monorepos, Front-end Architecture, Context API, Manual QA, QA Testing, Amazon S3 (AWS S3), Responsive Web Apps, Lodash, Full-stack Development, SaaS, Responsive UI, Cron, Fastify, Security, Back-end Development, Debugging, Software, Software Development, Mongoose, Databases
Full-stack Developer
2016 - 2018
RIKSOF Pvt. ltd
- Revamped an autism scheduler app, where parents with autistic children can schedule appointments with teachers using AngularJS and ASP.NET. I worked on the AngularJS side with a remote developer working on ASP.NET.
- Acted as the lead iOS developer for Curi, formally known as My5ive iOS application, a native iOS application built with Node.js and MongoDB.
- Developed some features for the Chimani: National Park iOS mobile app, namely layout designing and communicating with REST services.
- Integrated TMDB with My5ive iOS application through a Node.js server to catch frequently searched movies, actors, and other related information for a quick response.
- Designed and developed a Microsoft Power BI KPIs dashboard for the International Extended Care Center in Jeddah, Saudi Arabia.
- Provided on-site training for the International Extended Care Center staff using Power BI and helped them make new KPIs themselves.
- Launched and managed AWS EC2 servers, deploying them to multiple applications.
Technologies: Node.js, AngularJS, Express.js, iOS, React, Swift, Microsoft Power BI, Web Development, REST APIs, HTML, Amazon Web Services (AWS), Git, HTML5, Front-end, GitHub, APIs, Full-stack, Webpack, HTML5 Video, Responsive Web Design (RWD), REST, MongoDB, User Interface (UI), JavaScript, Back-end, Angular, Testing, Babel, DevOps, API Integration, NoSQL, Sass, API Development, MERN Stack, QA Testing, Amazon S3 (AWS S3), Responsive Web Apps, Lodash, Full-stack Development, Responsive UI, SQL, Security, Back-end Development, Debugging, Software Development, Mongoose, Databases
Trainee Developer
2015 - 2016
RIKSOF
- Built the APT Android application, which helped the Bank of Ireland's agents to move from paper to digital. The technology stack was Android, Node.js, and MongoDB.
- Reconfigured the above-mentioned APT Android application to work in offline mode using SQLite.
- Contributed to a multi-tenant application for doctors to manage their individual clinics—a clinic health care system based on PHP and MySQL. I worked on many different aspects, from query optimization to new features.
Technologies: MongoDB, Node.js, PHP, Express.js, Android Development, SQLite, MySQL, Web Development, HTML, Amazon Web Services (AWS), Git, GitHub, API Integration, Software Development, Databases
Junior Application Developer
2014 - 2014
Alltrack Pvt. Ltd.
- Designed and developed an Android-based personal tracking using GPS and GSM.
- Mapped GPS coordinates on vector maps using ASP.NET and C#.
- Contributed as a member of the development team for an online attendance system using ASP.NET and C# Webmaster.
Technologies: Android Development, Git
Project History
Stampline
https://stampline.io/Stampline is a US-American multi-tenant SaaS platform that generates personalized direct mail campaigns using AI with integrated subscription billing and automated print fulfillment. It is an AI personalized direct mail platform for B2B teams. I own the product end to end, from database schema and auth through billing, AI card writing, and print fulfillment.
AYR Dispensary
A TypeScript-based eCommerce project comprising Next.js with Tailwind CSS communicates through GraphQL and Strapi CMS back end. I was the full-stack developer building back-end APIs and pixel-perfect front-end UI using Figma designs. This project is entirely built using the back end dictating what to display to users, meaning we develop components, and CMS users customize them on what to display, how to display, and where to display. They can change the whole website without writing a single piece of code. I was there from the first line of code to the last, part of a think tank and in-depth analysis of requirements and their fulfillment from the back end to the front end. I also researched and integrated Meilisearch, a flexible and powerful user-focused search engine that can be added to any website or application. This open-source, lightning-fast, and hyper-relevant search engine fits effortlessly into our workflow. Using this approach, we build multi states dispensaries' websites with their look and feel.
FILOS Application
FILOS stands for FWU internet-based life office system, and as the name suggests, it's the digital tool that makes life easy for clients and distribution partners. FILOS consists of two parts:
1. Front office: It is used by business partners for digital applications. Its technology stack consists of React and Node.js, and it is a progressive web app (PWA) that clients can easily install on their mobile devices. My responsibilities are to oversee the FILOS front-office solution and collaborate with the back-office team.
2. Back office: The core back end is based on Java Spring Boot with MySQL Server as a database.
We have sold over 50,000 contracts electronically via FILOS. All our technological expertise has gone into making it the most innovative and secure insurance management tool out there. It is a total dynamic solution with a customizable theme so that business partners can mold the application according to their colors very easily. This way, they don't feel like they're using a third-party application instead of theirs; this helped us gain many new businesses.
1. Front office: It is used by business partners for digital applications. Its technology stack consists of React and Node.js, and it is a progressive web app (PWA) that clients can easily install on their mobile devices. My responsibilities are to oversee the FILOS front-office solution and collaborate with the back-office team.
2. Back office: The core back end is based on Java Spring Boot with MySQL Server as a database.
We have sold over 50,000 contracts electronically via FILOS. All our technological expertise has gone into making it the most innovative and secure insurance management tool out there. It is a total dynamic solution with a customizable theme so that business partners can mold the application according to their colors very easily. This way, they don't feel like they're using a third-party application instead of theirs; this helped us gain many new businesses.
Livable Property Manager Portal
https://pm.livable.com/Livable's user-friendly property manager dashboard makes it easier to see what is happening at your building and immediately increases the value of your asset. It receives alerts for potential leaks, tracks utility recovery amounts, and provides more features in one convenient web portal. It is designed to help reduce the environmental footprint while generating revenue for the property.
I worked as a full-stack developer on this project, performing tasks ranging from the front to the back end.
This portal helped keep costs low and consumption down by staying up-to-date on utility usage and billing with Livable. With Livable audits, customers were able to make informed decisions by reviewing trends in usage, calculating the current value of your building and individual units, and estimating their projected value in the future, all with the click of a button. Enrolling with Livable doesn't cost; it saves. Customers can explore their savings by the numbers with easy access to robust analytics—including recovery data and estimates.
I worked as a full-stack developer on this project, performing tasks ranging from the front to the back end.
This portal helped keep costs low and consumption down by staying up-to-date on utility usage and billing with Livable. With Livable audits, customers were able to make informed decisions by reviewing trends in usage, calculating the current value of your building and individual units, and estimating their projected value in the future, all with the click of a button. Enrolling with Livable doesn't cost; it saves. Customers can explore their savings by the numbers with easy access to robust analytics—including recovery data and estimates.
Livable Resident Portal
https://resident.livable.com/In this portal, tenants can review utility allocations and building occupancy in one transparent report while potentially discovering unreported tenants. The sophisticated calculations and accurate measurements are designed to simplify utility management for tenants and property owners.
I worked as a full-stack developer on this project, performing tasks ranging from the front to the back end.
Through the tenant connect portal, customers discovered how much they save when they cut back on waste each month. Tenants were able to commit to saving energy by monitoring the efficiency of their unit (or the entire building), tracking consumption trends, and making informed decisions to band together for improved sustainability. Residents were able to easily access their statements online and make payments using a debit or credit card, ACH debit, sending a check, or setting up automatic monthly payments.
I worked as a full-stack developer on this project, performing tasks ranging from the front to the back end.
Through the tenant connect portal, customers discovered how much they save when they cut back on waste each month. Tenants were able to commit to saving energy by monitoring the efficiency of their unit (or the entire building), tracking consumption trends, and making informed decisions to band together for improved sustainability. Residents were able to easily access their statements online and make payments using a debit or credit card, ACH debit, sending a check, or setting up automatic monthly payments.
AMUSE
https://www.amuse.com/I worked on AMUSE, a Next.js, React, Algolia, Storyblok CMS, and Storybook-powered cannabis delivery platform as a full-stack developer. My primary focus was enhancing the application's front-end, utilizing Next.js for robust server-side rendering (SSR) to optimize performance. We integrated Algolia's rapid search capabilities to provide users with an outstanding experience, enabling them to search through thousands of products in the blink of an eye.
Additionally, we leveraged Storyblok CMS for efficient content management and used Storybook to streamline the development and testing of UI components, ensuring a seamless and polished user interface.
Additionally, we leveraged Storyblok CMS for efficient content management and used Storybook to streamline the development and testing of UI components, ensuring a seamless and polished user interface.
UniChat App
A MERN stack web application known as UniChat. UniChat is an enterprise that consists of providing financial advice to clients in a more efficient and organized way, than how it's currently being conducted. The main layer for all clients is that none of the information is stored, after 24 hours of the each message, everything clears out, therefore we don't have any of your information as well of the advisor. The auditing system that we have implemented in the platform is another layer of security, to gather all finances and show the public our financial history of that month. The platform will be audited every 30 days, and the file will appear on the logs.
UniChat is the accumulation of private and public servers that advisors will be using to provide financial advice to their clients.
Servers are divided between public and private; public servers are free and have to do with general discussions that can provide some general knowledge of finance.
UniChat is the accumulation of private and public servers that advisors will be using to provide financial advice to their clients.
Servers are divided between public and private; public servers are free and have to do with general discussions that can provide some general knowledge of finance.
Education
2010 - 2014
Bachelor's Degree in Software Engineering
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology - Topi, Swabi, Khyber Pakhtunkhwa, Pakistan
Certifications
MAY 2024 - MAY 2027
AWS Certified Developer - Associate
Amazon Web Services (AWS)
Skills
Libraries/APIs
React, Node.js, REST APIs, React Redux, API Development, Stripe, React Router, Stripe API, Flexbox, Lodash, Socket.IO, Context API, React Hook Form, Zod Schema, Stripe Connect, Claude API
Tools
Git, Figma, GitHub, Mongoose, Jira, Meilisearch, Webpack, Redux Toolkit, Babel, Shadcn, Sentry, RabbitMQ, Cron, Claude, Claude Code, Microsoft Power BI, GitLab CI/CD, Jenkins, PM2, Shadcn UI
Languages
JavaScript, ECMAScript (ES6), CSS, HTML, GraphQL, TypeScript, HTML5, SQL, JavaScript 6, SCSS, Sass, PHP, Swift, Python
Frameworks
Bootstrap, Express.js, Material UI, Redux, JSON Web Tokens (JWT), Next.js, Tailwind CSS, Jest, Angular, i18next, NestJS, Fastify, AngularJS, Cypress, React Native
Paradigms
Responsive Web Design (RWD), REST, Microservices Architecture, Test-driven Development (TDD), Testing, Microservices, DevOps, Unit Testing, Role-based Access Control (RBAC), B2B, Search Engine Optimization (SEO)
Storage
MongoDB, NoSQL, Databases, PostgreSQL, Amazon S3 (AWS S3), Redis, SQLite, MySQL
Platforms
Meteor, Amazon Web Services (AWS), Vercel, Docker, Contentful, Google Cloud Platform (GCP), iOS, Algolia, Storyblok, Kubernetes
Other
APIs, Web Development, Front-end, Front-end Development, Full-stack, User Interface (UI), User Experience (UX), Back-end, API Integration, Card Payments, MERN Stack, Responsive Web Apps, Full-stack Development, Responsive UI, Pixel Perfect, Responsiveness, Webhooks, RTL, React Hooks, Dashboards, Payment Gateways, Performance, Security, Payments, Back-end Development, Debugging, Software, Software Development, RESTFul APIs, Architecture, Third-party APIs, PWA, Strapi, eCommerce, Headless Software, Content Management Systems (CMS), HTML5 Video, CI/CD Pipelines, Styled-components, Technical Leadership, Axios, Material Design, Front-end Design, Front-end Architecture, Progressive Web Applications (PWAs), Manual QA, QA Testing, Application State Management, Leadership, Code Review, Internationalization, Localization, React Server Components, i18n, Translation, SaaS, ESLint, Containerization, Artificial Intelligence (AI), Supabase, AI Engineering, Service Workers, Android Development, Storybook, Accessibility, WebSockets, Monorepos, Design Systems, AWS Cloud Architecture, Code Deployment, Codebase Development, AWS Certified Developer, QR Codes, Minimum Viable Product (MVP), Software as a Service (SaaS), Stripe Subscriptions, Anthropic
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