Haifeng Mei, Developer in Chaguanas, Trinidad and Tobago
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Haifeng Mei

Verified Expert  in Engineering

Full-stack Developer

Location
Chaguanas, Trinidad and Tobago
Toptal Member Since
September 5, 2022

Haifeng is a full-stack developer with half a decade of experience in building efficient and user-friendly applications in a variety of industries. He specializes in React and React Native for building dynamic and responsive user cross-platform applications that offer a seamless and consistent user interface on both mobile and web. Haifeng is also well-versed in .Net and NodeJs which enables him robust backend systems that integrate with a variety of databases.

Portfolio

Blackbox Technologies LLC
TypeScript, React Native, WatermelonDB, API Integration, Design...
Unqueue Distributors Ltd
React, React Native, Firebase, Android Studio, Adobe Experience Design (XD)...
Evolve Mortgage Services
Vue 2, .NET Core, Microsoft SQL Server, Entity Framework Core...

Experience

Availability

Part-time

Preferred Environment

React, React Native, .NET Core, JavaScript, TypeScript, Node.js

The most amazing...

...project I worked on allowed me to be a core member in revolutionizing the mortgage industry by offering remote end-to-end processes for mortgage closing

Work Experience

Front-end Mobile Developer

2022 - 2023
Blackbox Technologies LLC
  • Added a customized animated splash screen for a React Native mobile application.
  • Fixed bugs related to handling multimedia files, i.e., audio, video, and text, in React Native.
  • Implemented new features to a social media React Native mobile app.
Technologies: TypeScript, React Native, WatermelonDB, API Integration, Design, User Interface (UI), Responsive Design

Full-stack Developer

2021 - 2022
Unqueue Distributors Ltd
  • Developed and delivered the requested web payout feature to ensure clients could complete their banking processing promptly.
  • Completed the requested web signup and referral feature to ensure efficient customer registration before a specified deadline.
  • Delivered a mobile feature to manage the active status of the store to ensure clients and customers can maintain a clear line of communication.
  • Assisted with developing the React Native driver app to facilitate the delivery of orders by registered drivers.
Technologies: React, React Native, Firebase, Android Studio, Adobe Experience Design (XD), Slack, JavaScript, Serverless, TypeScript, Node.js, HTML, CSS, ASP.NET, Redux, REST APIs, JSON Web Tokens (JWT), OAuth, JSX, Responsive Web Apps, GitHub, Full-stack, Android, Scrum, Industrial Internet of Things (IIoT), Redis, Application State Management, Photoshop CC, User Experience (UX), Mobile App Development, Jest, JavaScript Charting, Single-page Applications (SPA), React Router, HTML DOM, Redux Thunk, UX Design, Elasticsearch, WebSockets, React Redux, Continuous Deployment, SQL, Mobile, Software, Apps, Architecture, Figma, Bootstrap, PWA, Expo, User Interface (UI), Gatsby, eCommerce, CI/CD Pipelines, MERN Stack, Agile, Headless CMS, Contentful, Headless Commerce, Express.js, MongoDB, GraphQL, Front-end, Mobile Development, Ruby on Rails (RoR), ECMAScript (ES6), Web & Mobile Applications, API Integration, Design, Responsive Design

Senior Software Developer

2021 - 2022
Evolve Mortgage Services
  • Developed an e-mortgage web application that allows lenders to securely store, track, and manage their mortgage packages and support the digital signing and notarization of borrower documents.
  • Designed the e-mortgage application mockups, which were used as the main design for the end product.
  • Met a very overloaded deadline by working overtime tirelessly to ensure the successful launch of the e-mortgage application and capture critical clients.
Technologies: Vue 2, .NET Core, Microsoft SQL Server, Entity Framework Core, Adobe Experience Design (XD), Teams, JavaScript, Node.js, APIs, HTML, CSS, Python, .NET, C#, ASP.NET, REST APIs, JSON Web Tokens (JWT), JSX, GitHub, Back-end, Full-stack, Leadership, Scrum, OLAP, Industrial Internet of Things (IIoT), Application State Management, Vue, Photoshop CC, User Experience (UX), Jest, JavaScript Charting, Single-page Applications (SPA), React Router, HTML DOM, UX Design, Confluence, WebSockets, Continuous Deployment, SQL, Software, Architecture, Twilio API, Bootstrap, User Interface (UI), MERN Stack, Agile, Express.js, MongoDB, Azure, C#.NET, Front-end, Data Visualization, Google Maps, ECMAScript (ES6), Continuous Integration (CI), Continuous Development (CD), Web & Mobile Applications, Test-driven Development (TDD), Unit Testing, Integration Testing, Acceptance Testing, API Integration, Design, Responsive Design, Nuxt.js, Vue 3

Full-stack Developer

2018 - 2021
Resonance Caribbean Ltd
  • Developed a PWA that facilitates the billing and top-up of all major telecom providers in the country, with an active user base of 10,000.
  • Designed the end product mockups for all new applications in the company.
  • Served as the lead UX designer and developer for the company's main projects.
Technologies: React, .NET Core, Microsoft SQL Server, Adobe Experience Design (XD), PHP 5, Python, Linux, Jira, Redux, MobX, Material UI, JavaScript, TypeScript, Node.js, APIs, HTML, CSS, .NET, C#, REST APIs, JSON Web Tokens (JWT), JSX, Responsive Web Apps, GitHub, Back-end, Full-stack, Leadership, Scrum, Industrial Internet of Things (IIoT), Application State Management, User Experience (UX), Single-page Applications (SPA), React Router, HTML DOM, Redux Thunk, UX Design, Confluence, Java, Leaflet, OpenLayers, WebSockets, React Redux, SQL, Software, Architecture, Twilio API, Bootstrap, MySQL, PHP, User Interface (UI), MERN Stack, Agile, C#.NET, ECMAScript (ES6), Continuous Integration (CI), Continuous Development (CD), Web & Mobile Applications, WordPress, API Integration, Design, Responsive Design, Progressive Web Applications (PWA)

Software Developer

2017 - 2018
Infotech Caribbean Ltd.
  • Contributed to developing an e-tender application that helps streamline the tendering process into a seamless digital platform.
  • Designed end-product mockups for the e-tender application's major features.
  • Ensured the e-tender product's successful completion and launch by quickly adapting and learning new technologies.
  • Maintained the Chronic Disease Assistance Programme (CDAP) system, which provides citizens with free prescription drugs and other pharmaceutical items to combat chronic health conditions.
Technologies: React, .NET Core, PostgreSQL, Docker, Microservices, Jira, JavaScript, HTML, CSS, .NET, C#, ASP.NET, REST APIs, JSON Web Tokens (JWT), JSX, Responsive Web Apps, GitHub, Back-end, Full-stack, Scrum, User Experience (UX), React Router, HTML DOM, UX Design, WebSockets, SQL, Software, Bootstrap, PHP, User Interface (UI), MERN Stack, Agile, Front-end, ECMAScript (ES6), Web & Mobile Applications, API Integration, Design

Front-end Development of a Top-up and Bills Payment PWA

https://portal.yoozit.today/
A React-based PWA that facilitates bill payments and top-up services for all the major telecom providers in the country. As the lead front-end developer, I designed and developed the PWA with the latest web framework and libraries, offering an intuitive and aesthetic mobile-first experience that transitioned seamlessly into the desktop with easy customization using themes and a content management system.

Back-end Development of an E-mortgage Web Application

A Vue-based web application designed to remove the in-person aspect of the mortgaging process by facilitating the digital signing and notarization and the complete tracking of the e-mortgage process. As the lead back-end developer, I built the back-end foundation to facilitate API calls. I also contributed to the app's front end to complete features during crunch time and meet tight deadlines.

Unqueue - Web/Mobile eCommerce App

https://unqueue.shop/
Unqueue Distributors Ltd's Unqueue is a mobile marketplace and ordering platform where businesses in Trinidad and Tobago can sell inventory, and shoppers can purchase items for curbside pick-up, in-store pick-up, and delivery.

Pet-MD

https://main.dvqyo09fp54dv.amplifyapp.com
A NextJs chatroom application to connect pet owners with a virtual vet, it leverages OpenAI ChatGPT to answer initial questions, and then users are given the option to talk to a real vet for more critical issues. It is a personal full-stack project and is in early development. I am responsible for building the entire application. A react native mobile app is on the way once core features are finished on the web app.
2019 - 2021

Master's Degree in Computer Science

University of the West Indies - Saint Augustine, Trinidad and Tobago

2014 - 2017

Bachelor's Degree in Information Technology

University of the West Indies - Saint Augustine, Trinidad and Tobago

Libraries/APIs

React, Node.js, REST APIs, React Router, React Redux, Twilio API, Vue, JavaScript Charting, D3.js, Vue 2, MobX, Leaflet, OpenLayers, AWS Amplify, Google Maps, Web3.js

Tools

JSX, GitHub, Redux Thunk, Adobe Experience Design (XD), Photoshop CC, Confluence, Figma, Slack, Jira, Android Studio, Git, Prisma, Expo, Amazon Elastic Container Service (Amazon ECS), Amazon Simple Queue Service (SQS), Amazon CloudWatch

Frameworks

.NET Core, React Native, Material UI, .NET, ASP.NET, JSON Web Tokens (JWT), Bootstrap, Redux, Next.js, Jest, Tailwind CSS, Ruby on Rails (RoR), Entity Framework Core, Kendo UI, Express.js, Android SDK, Selenium, Laravel, Nuxt.js

Languages

Python, JavaScript, TypeScript, HTML, CSS, C#, SQL, PHP, C#.NET, ECMAScript (ES6), GraphQL, PHP 5, Java

Paradigms

Scrum, HTML DOM, UX Design, Agile, Mobile Development, Microservices, UI Design, Continuous Deployment, Continuous Integration (CI), Continuous Development (CD), Test-driven Development (TDD), Unit Testing, Acceptance Testing, Agile Software Development, OLAP, Gang of Four (GOF) Design Patterns

Platforms

Mobile, Firebase, Android, Azure, AWS Lambda, Windows, Visual Studio Code (VS Code), Linux, Docker, iOS, Amazon Web Services (AWS), Google Cloud Platform (GCP), Kubernetes, Contentful, WordPress

Storage

Microsoft SQL Server, PostgreSQL, MongoDB, MySQL, Databases, NoSQL, Redis, Elasticsearch, Amazon S3 (AWS S3), Amazon DynamoDB

Other

Web Development, Responsive Web Apps, Full-stack, Application State Management, User Experience (UX), Single-page Applications (SPA), WebSockets, Software, Apps, Architecture, User Interface (UI), MERN Stack, Front-end, Web & Mobile Applications, API Integration, Design, Responsive Design, Progressive Web Applications (PWA), eCommerce, Serverless, APIs, Back-end, Amazon RDS, Leadership, Industrial Internet of Things (IIoT), Mobile App Development, Integration Testing, Teams, Cloud Computing, Algorithms, Networking, Machine Learning, OAuth, Cloud, PWA, Gatsby, CI/CD Pipelines, Headless CMS, Headless Commerce, AWS Cloud Architecture, Data Visualization, WatermelonDB, Lambda Functions, Vue 3

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