Hai Hoang Van

Senior Fullstack Engineer

📍 Hanoi, Vietnam
📞 +84 966 041 057
📧 haihv27@gmail.com
🔗 Portfolio · GitHub · LinkedIn

Summary

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

Frontend: Next.js, React, Nuxt.js, Vue.js, TypeScript, TailwindCSS, ChakraUI
Backend: Node.js, NestJS, Golang, Python, Express.js, tRPC, Prisma, REST APIs
Database: PostgreSQL, MySQL, Redis, Database Design, Query Optimization
Testing: Playwright, Cypress, Jest, Vitest
DevOps & Tools: Docker, CI/CD, AWS, Kubernetes, Kafka, Microservices 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.
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.
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.

Open Source

valifetch: Type-safe HTTP client built on native fetch with Valibot schema validation, featuring automatic type inference, retry logic, and request/response hooks.
nestjs-solana-kit: NestJS integration for Solana @solana/kit v5.x, providing 12 production-ready services for account operations, transaction building, and WebSocket subscriptions.

Experience

Moonraise – Web3 development on Solana and EVM ecosystems

Senior Software Engineer — Feb 2024 – Present

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.
Implemented Solana programs with Anchor for on-chain logic and token operations.

Endue – US healthcare startup, SaaS platform for infusion centers

Senior Software Engineer — May 2023 – Jan 2024

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.
Integrated LaunchDarkly for feature flags, A/B testing, and gradual rollouts.
Deployed comprehensive Playwright e2e tests covering critical user flows.
Optimized CI/CD pipelines reducing build time and Docker image size.

Depocket – Crypto on-chain tracking and portfolio management

Senior Software Engineer — Apr 2022 – Mar 2023

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).
Optimized database queries and indexing for fast portfolio calculations across multiple chains and wallets.
Set up CI/CD pipelines for automated testing and deployment.

LessonBox – EdTech platform for digital learning objects

Senior Software Engineer — Apr 2021 – Mar 2022

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.
Optimized backend performance with caching strategies and database query tuning.
Set up CI/CD pipelines with GitHub Actions deploying to Kubernetes (EKS).

Upatra – Shopify app development studio

Senior Software Engineer — Sep 2020 – Mar 2021

Developed Shopify apps with Python backends and React/Vue frontends.

UPLUS Solutions & Technologies – E-commerce solutions for checkout and dropshipping

Fullstack Software Engineer — Jan 2018 – Aug 2020

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.
Implemented Cypress e2e testing covering critical user flows.
Refactored and enhanced legacy backend systems (Python) for checkout flows and order management.

Enzimify – Shopify app development startup

Junior Software Engineer — Feb 2017 – Dec 2017

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.

Education

Completed all IT courses at Hanoi University of Science and Technology
Vietnam Mathematical Olympiad Award — Hung Yen Specialized High School