Backend engineer focused on building scalable APIs, e-commerce platforms, and SaaS infrastructure using Node.js, TypeScript, Go, PostgreSQL, and Redis.

I help startups and digital businesses build the systems behind their products — reliable backends, event-driven architectures, and high-performance APIs.

📍 Location: Changsha, China
🌍 Working with teams globally

I design and build backend systems for:

• SaaS platforms
• E-commerce infrastructure
• High-traffic APIs
• Real-time analytics pipelines
• Internal business tools
• Automation systems

My focus is clean architecture, reliability, and performance at scale.

TypeScript • JavaScript • Go (Golang) • Python • Bash

Node.js • Express.js • NestJS • Hono • Go Fiber • FastAPI

React • Next.js • Remix • Fresh • React Native • Flutter

PostgreSQL • MongoDB • Redis • SQLite • Turso

Messaging / queues:

RabbitMQ • Kafka

ORMs:

DrizzleORM • Prisma • Mongoose

Docker • Linux • Nginx • Traefik

AWS • Google Cloud • Cloudflare

CI/CD:

GitHub Actions

• REST API design
• Microservices architecture
• Event-driven systems
• Queue workers and job pipelines
• Server-side analytics tracking
• High-performance backend services

I have built backend systems for:

• multi-tenant e-commerce platforms
• SaaS applications
• order processing pipelines
• analytics tracking infrastructure
• internal dashboards and admin tools

Example capabilities:

• scalable checkout APIs
• background job systems
• payment integrations
• server-side conversion tracking
• product and inventory systems

An experimental multi-tenant storefront platform focused on efficient infrastructure and accurate marketing analytics.

Key features:

• Multiple stores running on a shared distributed server cluster
• Built-in server-side GA4 and Meta CAPI tracking
• Optimized API pipeline with intelligent caching
• CDN-based asset delivery
• SSR storefront rendering proxy built with Deno and JSX

A gamified medical learning platform inspired by tools like Duolingo and PassMedicine.

Focus areas:

• Low-bandwidth API design
• Optimized caching strategies
• Mobile-friendly architecture

Distributed backend system supporting high-traffic online stores.

Features:

• NestJS microservices architecture
• Redis caching and async processing
• Distributed workers for order processing
• CI/CD deployments using Docker and GitHub Actions

Worked on internal tools, backend APIs, and automation systems.

Responsibilities:

• System utilities
• Monitoring APIs
• Backend infrastructure development

Worked on e-commerce infrastructure and automation systems used by thousands of users.

Responsibilities:

• REST API development
• Order processing systems
• Backend integrations
• Performance improvements

My main focus areas:

• Scalable backend architecture
• Event-driven systems
• High-performance APIs
• Queue and worker systems
• Distributed services

I enjoy building reliable systems that continue working under heavy load.

I work with:

• Startups building SaaS products
• Businesses launching e-commerce platforms
• Teams needing backend infrastructure
• Founders building MVP products

If you are building a product and need help with backend systems, infrastructure, or APIs, feel free to connect.

LinkedIn
https://linkedin.com/in/a4arpon

GitHub
https://github.com/a4arpon

Website
https://a4arpon.vercel.app

StackOverflow
https://stackoverflow.com/users/a4arpon

Backend Engineer
Node.js Developer
TypeScript Backend Developer
Golang Backend Engineer
E-commerce Backend Developer
SaaS Backend Developer
API Developer
Microservices Engineer
Distributed Systems Developer