XiaoFeng An
Verified Expert in Engineering
Software Developer
With 14 years of extensive software development expertise, XiaoFeng has contributed to projects of diverse scales, showing commitment to fast delivery, exceptional quality, and reliability. Demonstrating an understanding of project requirements, XiaoFeng consistently identifies optimal methodologies to deliver solutions at an elevated standard. He is proficient in both front-end and back-end development, even DevOps, so he prioritizes meticulous attention to architecture and writing clean code.
Portfolio
Experience
Availability
Preferred Environment
Slack, Git, Visual Studio Code (VS Code), Linux, Angular, React, Node.js, Laravel, Python, Agile Software Development
The most amazing...
...project I contributed to included nine large-scale initiatives, leading three of them, where the largest reached 1 million users.
Work Experience
Team Lead
The Auction Collective
- Led a startup team of five engineers, navigating the challenges of building and growing in a startup environment.
- Launched the product successfully, achieving a significant milestone of 1 million total users.
- Generated $1.5 million in sales last year through the platform's auctions.
- Refactored and took migration to a modern tech stack while maintaining the legacy product.
Senior Software Engineer (TypeScript, Firebase)
Status
- Refactored an old AngularJS project into a modern Angular one by utilizing Angular/TypeScript features and practices.
- Implemented various features in Shopify API, including usage-based billing service, and ensured the performance.
- Set up CI/CD pipeline with GitHub Actions and created a few new Docker containers for a better developer experience.
- Introduced coding styles and guidelines and the PR review system so that developers would collaborate and help each other more efficiently under the principles.
- Implemented a database management system with PlanetScale branching and a migration system.
- Used Firebase SDK and cloud functions and introduced the approach to handle authentications and permissions between customers, shop owners, and admin roles.
Billing Software Engineer
Tribe Technologies
- Collaborated with designers, product managers, and other developers to build tools to help the customers and partners succeed.
- Developed new features for the back-end services using Nest.js, TypeScript, TypeORM, and PostgreSQL and used Kafka to communicate asynchronously between microservices inside the back-end app.
- Helped ensure that the constantly evolving system is highly available and able to accept several code deployments per day by utilizing DevOps best practices.
- Built payment service based on Stripe SDK with various types of subscription systems.
- Implemented cron jobs to manage the customer information and subscription status with trials approach with Nest.js.
React Native/Node.js Developer
Cary Rx Incorporated
- Reduced the development effort by 30% by re-architecting the product using 100% JavaScript—Node.js, React, and React Native, where every engineer is a full-stack one and can work on any portion of the system.
- Managed the product development from discovery through public launch, simultaneously coordinating domestic and offshore resources both internal and external to the company.
- Enabled the mobile app to connect to Bluetooth printers to print QR code badges that can be scanned in-app to clock workers in and out, track tickets, and create quality notes.
- Estimated, planned, and tracked development efforts across four distinct stacks to assist the product owner in budget and resource planning.
- Developed a universal search feature for a customer-facing analytics application that allowed all of the application's data entities to be searched instantly within a single interface.
- Retrofitted the entire product for multilingual support as a requirement for the advance of a major financial partnership.
- Implemented a UX recommendation library that recommended specific best practices based on what UX problems were encountered.
Vue Firebase Developer
Hive Properties Pty Ltd
- Created a custom responsive drag-and-drop calendar, note, and appointment system with Vue, saving users from using multiple applications.
- Implemented user registration and an authentication system with Firebase Auth and Firebase Cloud Functions.
- Implemented and integrated a custom action tracking tool, allowing the company to collect and analyze any user activity.
- Built an extensive, component-based mailing application similar to MailChimp for marketing messages with live preview and staging.
- Redesigned and rewrote an existing platform utilizing SSR and custom drag-and-drop Vue components. Created dozens of reusable components, integrated APIs, and managed app states using Vuex and Vuex Store.
React and Node.js Full-stack Developer
TrkrCenter
- Developed a React single page application with rich feature sets targeted mainly for charts data visualization using React as the front-end framework.
- Built RESTful APIs using Node.js, Express.js, and MongoDB and deployed them to AWS EC2.
- Reduced a React and Node.js application downtime from five seconds to one second, resulting in a 97% uptime by implementing an auto-reconnecting WebSocket library.
- Implemented RESTful security standards for both the React front end and Node.js back end as defined by OSWAP.
- Developed a role-based access control (RBAC) microservice, which reduced malicious logins by 34%.
- Automated manual data entry systems in the projects using React, resulting in a 50% reduction in the application processing delay and 30% less error in data inconsistency.
- Lowered deployment time by 70% for 50 live instances by integrating a Jenkins pipeline into the React repository.
Senior Angular Developer
Genoox
- Developed the front end of an Angular web application.
- Integrated RESTful API endpoints to the application using RxJS, Observables, Ngrx, and Ngrx-store.
- Translated Zeplin designs into working boilerplate, complete with responsiveness, SVG animations, and functionality.
- Built components libraries using Angular, Angular Material, RxJS, Ngrx, HTML5, and SCSS and CSS.
- Published and integrated npm modules for reusable components used across different platforms.
- Used D3.js to visualize medical data and custom display using D3.js paths and group elements.
Senior React Developer
Pacific Biosciences
- Implemented React UI features and fixed bugs using React, Redux, Semantic-UI, and TypeScript.
- Created several React components with Plotty charts that support interactive visualizations of data projections and analysis.
- Implemented an API call with cancelable promises using React hooks.
- Introduced the React HOCs for code reuse, logic, and React bootstrap abstraction.
- Built an internal analysis and report generating user interface with JavaScript MVC structure via React and Redux.
- Implemented the showing feature of the field-level validation error message from the back-end API response with Redux Form and promised handling in React project.
- Documented the internal design system and set up shared components with Storybook.
Vue and Python Developer
Private Company
- Built the front end using Vue and Vuetify. Implemented state management using Vuex.
- Implemented microservices using Python, Flask, and Docker. Implemented auto deployment from Docker Hub to AWS EC2.
- Integrated a key and value server called Consul. Managed and maintained both front-end and back-end repositories.
Web Developer
Neusoft
- Supported enterprise-level ERP and CRM using Java and Angular. Created various test codes for CI/CD.
- Worked on searching solutions using Elasticsearch.
- Implemented a UI-intensive social networking site utilizing Bootstrap, Modernizr, and React.
- Helped with hosting on Amazon, DigitalOcean, and Rackspace, GoDaddy, and cross-linked DBs and other resources.
- Supported real estate sites with React and Ruby on Rails. Created API endpoints based on Swagger.
- Supported the development of some SaaS projects with Angular and PHP, Angular and Rails, and React and Rails stacks.
- Converted design and mockups to pixel-perfect HTML and CSS using Bootstrap and improved the quality and reduce time with a CSS preprocessor, including Sass and Less.
Full-stack Developer
ACHIEVO
- Built a RESTful API for a mobile app and web application with PHP, Laravel, Node.js, and Express.js.
- Designed a large and complicated database and optimized queries for better performance.
- Converted the provided designs from PSD and Sketch to pixel-perfect HTML pages with very optimized Sass code.
- Implemented the RESTful APIs in the front end using JavaScript frameworks like Angular.
- Consulted on technical solutions for aspects of choosing the stack and frameworks.
- Conducted unit tests for every code snippet and deployed the projects to Linux-based servers from DigitalOcean, GoDaddy, and AWS.
Senior iOS Developer
TMO Group
- Managed full-stack development using Agile methodology.
- Created an image processing module using Objective-C GPUImage library.
- Implemented a back-end REST API for real-time location updates using PHP, MySQL, and Google Maps API.
- Created Objective-C components for social networking such as messaging, profiling, matching, and more.
- Integrated social networking APIs like Facebook, Twitter, and Instagram.
- Built some mobile app landing pages using PHP and a Bootstrap template.
- Implemented payment modules using Stripe and Braintree.
Experience
Rappi | Food Delivery
I worked as part of a small team to build React Native iOS/Android applications. I also architected, built, and maintained excellent React Native applications with clean code. The client provided the InVision design and I implemented pixel-perfect UIs that match the designs. I implemented clean, modern, smooth animations and transitions that provide an excellent user experience and integrate third-party APIs. We used TDD so I had to write unit and integration tests.
Contetto | Marketing Platform
We used the MERN stack (Mongo, Express, React, Node) for this project and improved user-friendliness via discussion. This project used a Bootstrap theme for a better look and feel. It also used Firebase for messaging and push notification to the end users.
Real Estate Service Website
http://www.noagentproperty.com.au/This project uses React, Redux, Node.js, PostgreSQL with Bootstrap, and Modernizr integrated.
The project is user-friendly with mobile responsive, interactive, cross-browser compatible screens and is also performance-driven.
Front-end Development for an Insurance Project
Online Auction Platform
http://theauctioncollective.comSkills
Languages
GraphQL, CSS, ECMAScript (ES6), TypeScript, SCSS, HTML5, CSS3, JavaScript, HTML, Sass, PHP, SQL, Python
Frameworks
Bootstrap, Cypress, React-Bootstrap, Redux, JavaScript MVC, Jest, Express.js, Bootstrap 3, Material UI, React Native, NestJS, Next.js, Angular, Angular Material, Ionic, JSON Web Tokens (JWT), Laravel, Svelte, AngularJS, .NET, Nuxt.js, Tailwind CSS, Vuetify
Libraries/APIs
Redux-Saga, jQuery, REST APIs, D3.js, React, Node.js, Google Maps, RxJS, API Development, Stripe, Stripe API, Firebase Web SDK, NgRx, React Redux, Parse SDK, Vue, AWS Amplify, Modernizr, Shopify API, Vuex, PayPal API
Tools
Sequelize, Expo.io, WebStorm, Git, Slack, React Apollo, Redux Thunk, JavaScript Testing, Webpack, GitHub, Jira, Stripe Checkout, Firebase Cloud Messaging (FCM), Expo, Prisma, Auth0, Figma, JSX, Jenkins, Docker Compose, Amazon Simple Email Service (SES), Terraform, Fastlane, Sentry, Mailchimp, Amazon Simple Notification Service (Amazon SNS)
Paradigms
Unit Testing, Agile, Microservices, E2E Testing, RESTful Development, Continuous Delivery (CD), Continuous Integration (CI), Test-driven Development (TDD), Agile Software Development, REST, Reactive Programming, Responsive Web Design (RWD), Mobile Development, Test Automation, DevOps, Search Engine Optimization (SEO), Load Testing
Platforms
MacOS, Firebase, Amazon EC2, Docker, Visual Studio Code (VS Code), Mobile, Heroku, Vercel, Linux, Amazon Web Services (AWS), Parse Server, Parse, Kubernetes, iOS, Android, WordPress
Industry Expertise
Healthcare, Banking & Finance
Storage
MySQL, Amazon S3 (AWS S3), PostgreSQL, MongoDB, NoSQL, Cloud Firestore, Google Cloud, Databases
Other
Web Development, Fintech, Back-end, Front-end, Progressive Web Applications (PWA), Serverless, SVG, Apollo, Apollo Server, Responsive UI, Enzyme, CSS3 Animation, Mobile App Development, Front-end Development, ES6 Promises, JavaScript Libraries, Full-stack, Stripe Payments, Stripe Subscriptions, Firebase Cloud Functions, TypeORM, CSS5, Mobile Apps, Firebase Hosting, API Integration, Axios, User Experience (UX), User Interface (UI), Finance, APIs, Back-end Development, Monorepos, Application State Management, Mobile First, Digital Payments, Mobile Banking, Online Banking, Storybook, Responsive Web Apps, Pixel Perfect, eCommerce, Web Accessibility, Cryptocurrency, Full-stack Development, Zustand, WebSockets, Service Workers, Financial Modeling, Software Architecture, Gatsby, Web-based Interface, Styled-components, CI/CD Pipelines, Computer Engineering, PayPal, Card Payments
Education
Bachelor's Degree in Computer Engineering
Wuhan University - Wuhan, Hubei, China
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