Sean Zeng
Verified Expert in Engineering
Full-stack Developer
Auckland, New Zealand
Toptal member since July 16, 2020
Sean is a software architect from New Zealand specializing in full-stack development with a strong focus on usability, security, and simplicity. He's built business applications, streamlined development with DevOps pipelines, and delivered latency-sensitive architecture. With a passion for software, he excels at providing reliable management and great ideas. Sean enjoys working with brilliant, humble people who aren't afraid to tackle challenges and take the initiative to create excellence.
Portfolio
Experience
- Node.js - 5 years
- React - 4 years
- Python 3 - 4 years
- Web Architecture - 3 years
- Azure - 3 years
- MongoDB - 2 years
- Google Cloud - 2 years
Availability
Preferred Environment
WebStorm, GitHub, PyCharm, React, Azure, Amazon Web Services (AWS), Mobile Apps, Jupyter Notebook, Cloudflare, Linux, Node.js, APIs
The most amazing...
...PWA React game I've built was a modular Node.js game server over Socket.IO with leaderboards, real-time chat, email, Stripe payments, and latency compensation.
Work Experience
Professional Teaching Fellow (Lecturer)
The University of Auckland
- Lectured over 200 postgraduate information technology students on various topics, including Java object-oriented programming, full-stack development, and database design. Achieved cumulative teaching rating of over 95% in formal evaluations.
- Reviewed over 1,000 independent codebases, grading code quality and providing feedback to authors where needed. The codebases ranged from 5-person team repositories to small OOP code bases. Developed scripting tools to help automate manual processes.
- Worked with the team on adapting AI use to best prepare aspiring developers to be effective in the workplace. I learned to differentiate subtle fingerprints of AI-generated code and adapted mitigation strategies to help improve quality and learning.
- Mentored 10 different teams of five full-time developers simultaneously in an Agile development environment. Built strategies using Git access control to simplify the management of formal PR processes, reducing the occurrence of workflow regressions.
Full-stack React Native Developer
Sylo
- Designed and implemented public key challenge server authentication for a crypto-wallet Chrome browser extension based on WebAuthn standards.
- Developed a cost-effective, secure solution for tracking view counts on a marketplace platform. Utilized Google Cloud GA4 Analytics API for accurate report generation on our servers.
- Animated front-end UI elements with compatibility across React Native web, iOS, and Android deployments.
- Helped implement CI deployment strategies to speed up our Agile development cycles. Automated deployments to AWS, specifically CloudFront, S3, EBS, and Amplify.
Lead Full-stack React Developer
ChessPower
- Designed cost-effective architecture for a feature-rich, monetized, multiplayer variant chess game, X-Chess Project.
- Oversaw and mentored developers to deliver features with minimal technical debt and optimal workplace culture.
- Worked directly with the client in an agile development environment, achieving optimal task prioritization, time estimation, and feature prioritization.
Software Engineering Intern
Datacom
- Completed data visualization of application and customer information using D3.js.
- Offered quote estimations via Restful API to a front-end Material UI and React interface protected by Azure Active Directory authentication.
- Oversaw the automatic deployment of new changes to both front-end and back-end servers using Azure DevOps, including automated SQL server migrations.
- Completed unit testing in .NET C# to validate proprietary algorithms.
- Oversaw team-based GitHub management, including pull requests, code reviews, and merging complex changes in a React front end.
Unity and Node.js Server Developer
Mediahive, LTD.
- Developed a manageable, latency-sensitive architecture to relay game data in a performant, economical manner using Socket.IO.
- Orchestrated an Azure DevOps CI pipeline with the test, staging, and production steps to streamline complex deployment variables and catch mistakes early.
- Developed a performant user data update protocol using NoSQL and MongoDB. Rapid game state changes on the client are first aggregated and then sent to the server in short bursts to optimize the database and server workload.
- Integrated third-party APIs to facilitate secure monetary transactions.
Experience
Inkwars
https://apps.apple.com/nz/app/ink-wars-bubble-arena/id1257602854Immich
https://immich.appX-Chess
https://dev.xchess.online/X-Chess License Code Package
Education
Postgraduate Diploma in Computer Science
The University of Auckland - Auckland
Bachelor's Degree in Computer Science
The University of Auckland - Auckland, New Zealand
Certifications
Microsoft Certified: Azure Fundamentals
Microsoft
Skills
Libraries/APIs
Node.js, React, REST APIs, Stripe, Stripe API, React Redux, Socket.IO, Beautiful Soup, D3.js, React Native for Web, AWS Amplify, Web3.js, Puppeteer, Google Sheets API
Tools
GitHub, Google Sheets, NGINX, SendGrid, NPM, Google Analytics, MongoDB Atlas, Azure App Service, Docker Compose, Auth0, Microsoft Excel, MetaMask, Jira, Let's Encrypt, IntelliJ IDEA, WebStorm, JetBrains Rider, PyCharm, Mocha, Amazon CloudFront CDN, Amazon Elastic Block Store (EBS), CircleCI, Figma
Languages
Python 3, JavaScript, Python, TypeScript, SQL, TypeScript 3, CSS, C++17, Java 11, C#.NET, C#, HTML, HTML5, Java 8, Java, PHP, Go, GraphQL, Excel VBA
Frameworks
Express.js, Material UI, .NET Core, Tailwind CSS, Jest, Redux, Django, Unity2D, .NET 3, .NET, Bootstrap, .NET 4, Unity, React Native, Parity Polkadot, Next.js, Scrapy, Selenium, NestJS, Svelte
Paradigms
Web Architecture, Unit Testing, RESTful Development, Azure DevOps, Web Application Architecture, MEAN Stack, Search Engine Optimization (SEO), Object-oriented Programming (OOP), Dynamic Programming, DevOps, Management, Agile, Automation
Platforms
Windows, Azure, Docker, Amazon Web Services (AWS), Linux, Anaconda, Magento 2, WordPress, Firebase, MacOS, Android, LAMP, Ethereum, iOS, Shopify, Blockchain, Raspberry Pi, Amazon EC2, AWS Lambda, Azure Functions, DigitalOcean, Jupyter Notebook
Storage
MongoDB, PostgreSQL, Redis, Databases, Docker Cloud, MySQL, Azure SQL, Azure Active Directory, Google Cloud, Amazon S3 (AWS S3)
Other
Web Scraping, Gaming, Access Control, APIs, Full-stack, Authentication, MERN Stack, Data Scraping, Scraping, API Integration, Discord, Scripting, Full-stack Development, SSL Certificates, CI/CD Pipelines, Payment APIs, Web Development, Stakeholder Management, IT Security, MikroTik, Ubuntu Server, Data Visualization, WebAuth, eCommerce, IoT Security, Blockchain & Cryptocurrency, Security, Data Engineering, FIDO2, Bots, CAPTCHA, Front-end, Integration, Discord Bots, Automation Scripting, Dashboards, Reports, Architecture, Website Data Scraping, Data Analysis, Algorithms, Machine Learning, Data Science, Computational Biology, TCP/IP, GitKraken, Cryptocurrency, Unit, Web Extensions, Cryptography, Cloud, Private NPM Modules, WebAssembly (Wasm), Live Chat, Data Privacy, Chrome Extensions, Distributed Systems, Web Security, Software & Hardware Maintenance, Software Development Management, Mobile Apps, Google Tag Manager, Google Analytics 4, Leadership, Cryptocurrency Wallets, Migration, Cloudflare, Metrics, Lecturing, Team Mentoring, Code Auditing, AWS DevOps, Artificial Intelligence (AI), Chatbots, Image Classification, Semantic Search
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