Portfolio

Hello 👋, I’m Phatthakarn Jirayusakul.

I’m a backend developer with nearly 4 years of hands-on experience in Golang. Previously, I worked with TypeScript using NestJS and Next.js, giving me a solid understanding of full-stack systems.

Currently, I’m working as a Backend Developer (Golang), fully focused on backend development with no involvement in frontend work. I have experience in the insurance domain and am familiar with designing systems using Clean Architecture, Hexagonal Architecture, and Domain-Driven Design (DDD).

Skills

Programing language

Golang

Java

TypeScript

Rust

Python

PHP

Framework

Fiber

Gin

Spring Boot

Nest.JS

Next.JS

Actix Web

Other

Docker

Redis

Apache Kafka

PostgreSQL

Traefik Proxy

Prometheus

Work Experience

Jul 2025-2026

Golang Developer (outsourced)
Worked as an outsourced Golang Developer on a regulated banking platform, developing and maintaining Core Banking (Core 2) backend services and supporting Cardless ATM transaction flows. Collaborated with cross-functional teams to deliver reliable, production-ready features within sprint timelines.

PERSOL HR Services Recruitment (Thailand) Co., Ltd.

Jul 2022-2025

Senior Backend Golang
At first, I worked as a Full Stack Developer, but later transitioned to a full-time Backend role as a Senior Developer. Responsibilities included interpreting SA specifications, designing backend project structure, writing unit tests, and API documentation.

Extend IT Resource Co., Ltd.

Jan 2019 - Sep 2021

Software Engineer
Full Stack Developer responsible for client communication, project design, infrastructure deployment, and mentoring new team members.

Internet Thailand Public Company Limited

Personal Projects

Mini Food Story - Restaurant Ordering System

Go
Redis
PostgreSQL
Kafka
WebSocket
Docker

Built a microservices-based dine-in restaurant system. Customers order via table QR codes, with real-time order processing through Kafka and WebSocket.
– Designed using Clean & Hexagonal Architecture
– Implemented event-driven communication with Kafka
– Used Redis for fast order tracking and session handling
Task Management API – Java Version

Java
Spring Boot
PostgreSQL

Developed a task management API with full CRUD features using Java Spring Boot.
– Designed with Hexagonal Architecture for modularity and testability
– Integrated with PostgreSQL for persistent storage
– Focused on clear separation of domain logic and infrastructure
Task Management API – Rust Version

Rust
Actix Web
PostgreSQL

Built a task management backend in Rust focusing on performance and security.
– Designed using Clean Architecture for scalability
– Implemented JWT-based authentication
– Included comprehensive unit tests
– Used PostgreSQL as the primary data store