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About Me

Senior Fullstack Engineer with 9+ years building end-to-end web applications. Proficient in TypeScript, React/Next.js, Node.js/NestJS, and Golang, with proven ability to architect scalable systems and deliver complete features from database to UI. Built e-commerce platform powering $4M/month operations and multiple Web3/Solana dApps for global clients.

Skills & Expertise

Frontend

Next.jsReactNuxt.jsVue.jsTypeScriptTailwindCSSChakraUI

Backend

Node.jsNestJSGolangPythonExpress.jstRPCPrismaREST APIs

Database

PostgreSQLMySQLRedisDatabase DesignQuery Optimization

Testing

PlaywrightCypressJestVitest

DevOps & Tools

DockerCI/CDAWSKubernetesKafkaMicroservices Architecture

Key Projects

E-commerce Platform

Full-stack e-commerce with microservices backend (Node.js) and Nuxt.js storefronts, powering $4M/month dropshipping operations with checkout and payment processing.

Nuxt.jsVue.jsNode.jsExpress.jsCypress

Web3 Applications

Full-stack dApps across DID, KYC, prediction, and gaming domains with Solana/EVM integrations, NestJS/Golang backends, and React frontends with wallet connections.

Next.jsNestJSPrismaGolangSolanaAnchor

Healthcare SaaS

End-to-end infusion-center platform using T3 stack (Next.js, tRPC, Prisma) with FHIR-compliant APIs, serving top US clinics with Playwright e2e testing.

Next.jstRPCPrismaPlaywrightLaunchDarklyFHIR

Experience

Moonraise

Senior Software Engineer | Tech Lead – Blockchain

Feb 2024 – Present

Web3 development on Solana and EVM ecosystems

  • Delivered full-stack dApps for global clients across multiple domains, building Next.js/React frontends and NestJS/Golang backends
  • Designed RESTful APIs and database schemas (Prisma ORM) with Redis caching, optimizing query performance for blockchain data
View details

Endue

Senior Software Engineer

May 2023 – Jan 2024

US healthcare startup, SaaS platform for infusion centers

  • Built full-stack features using T3 stack with type-safe API layer (tRPC), database modeling (Prisma), and Next.js frontend
  • Designed database schemas for complex healthcare data (patients, appointments, etc.) and implemented FHIR-compliant APIs
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Depocket

Senior Software Engineer | Tech Lead

Apr 2022 – Mar 2023

Crypto on-chain tracking and portfolio management

  • Built full-stack features including new frontend version and backend APIs (Golang) for blockchain data aggregation with Redis caching
  • Implemented EVM chain integrations on both backend (Web3.js, Ethers.js) and frontend (wallet connections, transaction signing)
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LessonBox

Senior Software Engineer | Tech Lead

Apr 2021 – Mar 2022

EdTech platform for digital learning objects

  • Built full-stack features with React frontend and NestJS microservices for content management, authentication, and progress tracking
  • Designed database schemas for learning content, user progress, and assessment data with efficient querying patterns
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Upatra

Senior Software Engineer

Sep 2020 – Mar 2021

Shopify app development studio

  • Developed Shopify apps with Python backends and React/Vue frontends
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UPLUS Solutions & Technologies

Fullstack Software Engineer

Jan 2018 – Aug 2020

E-commerce solutions for checkout and dropshipping

  • Built frontend storefronts (Nuxt.js with SSR) and admin dashboards (Vue.js) for e-commerce platform handling 50K paid orders/month
  • Optimized storefront performance for faster page loads and improved conversion rates
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Enzimify

Junior Software Engineer

Feb 2017 – Dec 2017

Shopify app development startup

  • Developed Shopify apps (Express.js, Vue.js) with Kafka data processing pipelines on AWS
  • Built backend services with Shopify API integrations, webhook processing, and event tracking systems
View details

Let's Work Together

I'm always open to discussing new opportunities and interesting projects.

haihv27@gmail.comConnect on LinkedIn