Leif Le

Leif Le

Le Nhat Quang · Full-stack engineer · Da Nang, Vietnam

I build Next.js products with AI features, from the first MVP to a production app.

Available for freelance projects

About Me

Software Engineer with 3+ years of experience designing and building scalable web applications across finance, government, and edtech sectors. Strong expertise in React, TypeScript, and modern frontend architectures, combined with hands-on backend development using NestJS and PostgreSQL.

Alongside my day job I have built and shipped three products: Teachi, an AI lesson-planning platform for tutors; Danaangi, a multilingual QR menu SaaS for restaurants; and KIRA Prints, a photo-print store with its own production back office. All three are live in production.

I take on freelance work where that experience helps: building an MVP end to end, adding AI features (OpenAI, document import, AI-assisted editing) to an existing Next.js app, or cleaning up a slow React front end. I have worked with teams in Singapore, China and the US and write clear async updates.

Skills & Technologies

Frontend
ReactReact NativeNext.jsTypeScriptTailwind CSSSharePoint Framework (SPFx)
Backend
Node.jsNestJSGraphQLPostgreSQLSupabase.NETSpring BootMongoDB
AI, Cloud & Tools
OpenAI APIAWSCloudflare R2VercelDockerPlaywrightMicrosoft Power PlatformAzure

Experience

Software Engineer
Digital Unicorn
08/2025 - Present
Full-time
Da Nang, Viet Nam
  • Build full-stack web applications with React, TypeScript and NestJS, delivering scalable UIs and backend APIs.
  • Design and maintain RESTful APIs integrated with PostgreSQL for reliable storage and strong query performance.
  • Lead technical design and peer code reviews, enforcing strict TypeScript typing and clean architecture.
  • LyCarr (collaboration platform for auto body shops): built the responsive UI, integrated the front end via GraphQL (Apollo Client), and deployed services on AWS (S3, SES) with the DevOps team.
Founder & Lead Developer
Code Crafters
06/2024 - Present
Own studio, part-time
Da Nang, Viet Nam
  • Lead development of Danaangi (danaangi.com), a SaaS for multilingual QR menus and shop websites used by restaurants and cafés.
  • Founded and led CodeCrafter, an adaptive learning platform helping students master exam preparation through flashcards, AI-assisted testing, and personalized progress tracking, reaching 1,000+ active users within the first 6 months of launch.
  • Managed client outsourcing projects, delivering tailored web applications with end-to-end architecture, deployment, and ongoing maintenance.
Software Developer
AvePoint
09/2023 - 08/2025
Full-time
Da Nang, Viet Nam
  • Collaborated with a cross-functional, international team (PMs, BAs and QAs in Singapore and China) to deliver smoothly across time zones.
  • AIIB (Asian Infrastructure Investment Bank): built a paperless membership-management platform with React, SharePoint Framework, Power Automate and .NET, owning the full cycle from requirements to deployment.
  • Provided guidance and support to team members, including new developers, to ensure smooth integration into the project and phase.
  • Boosted application performance through API optimization and codebase refactoring.
  • Ensured software reliability and stability by proactively monitoring code performance, identifying bugs, and implementing effective solutions.
Full-stack Developer
Viral Profits
05/2024 - 08/2024
Remote contract, part-time
Remote, US
  • Developed an e-learning platform teaching faceless YouTube content creation, integrating payment processing and automated student engagement, focusing on user-friendly navigation and responsive design.
  • Built systems for quizzes, seamless checkout processes, and booking calendars, enhancing user engagement.
  • Integrated video playback for e-learning modules, ensuring compatibility performance across devices.
  • Implemented payment gateways and managed user subscriptions to facilitate a streamlined purchase experience.
  • Collaborated on Slack API integration for team notifications and updates related to the platform.
  • Delivered high-quality, scalable React applications, meeting project requirements and exceeding user expectations.
Intern Front-End Developer
NCC Asia
06/2023 - 08/2023
Internship
Da Nang, Viet Nam
  • Built and optimized an internal timesheet management system using React, enhancing tracking and reporting efficiency.
  • Learned modern web development practices.
  • Collaborated with designers and project managers.
  • Identified and resolved performance bottlenecks, improving application speed and reliability.

Featured Projects

Products I built, live in production

Teachi homepage

Full-stack engineer

Teachi
AI teaching platform for English tutors: lesson plans, worksheets and homework generated in seconds and edited like a Google Doc.
Next.js 16TypeScriptSupabasePostgreSQLOpenAI APITiptap
Danaangi homepage

Lead developer, Code Crafters

Danaangi
SaaS for restaurants and cafés: a multilingual QR menu and a shop website, set up in minutes without code.
Next.js 15React 19TypeScriptSupabasePostGISUpstash Redis
KIRA Prints homepage

Solo: design, development and deployment

KIRA Prints
Storefront, order builder and production back office for a photo-print and memory-gift brand in Da Nang.
Next.js 16TypeScriptTailwind CSS 4SupabaseCloudflare R2PayOS