Than
Chayawik

Full-stack software engineer with experience across web development, cloud infrastructure, and DevOps. I build and ship production systems with React, Next.js, Spring Boot and NestJS while managing AWS infrastructure with Terraform and CI/CD pipelines. I enjoy working in international, cross-cultural teams.

1. 01

   Junior Software EngineerOnify Company Limited

   May 2025 – Present

   Internal Multi-Tenant Kubernetes Platform

   stack

   OpenTofuAWS EKSArgoCDGitHub OIDC

   • Designed and built a shared multi-tenant Kubernetes platform on AWS EKS from scratch with OpenTofu, onboarding multiple application tenants onto a single cluster with namespace-level isolation.
   • Implemented GitOps delivery with ArgoCD (App-of-Apps) and ArgoCD Image Updater, automating the full pipeline from git push to ECR build to automated image rollout with no manual deploys.
   • Eliminated static AWS credentials for all workloads and CI by adopting EKS Pod Identity, IRSA, and GitHub Actions OIDC.
   • Manage domain and DNS in Cloudflare, standardizing ingress with a wildcard ACM certificate, a shared per-environment ALB, and a wildcard DNS record so onboarding a new application requires zero certificate or DNS work.
   • Provisioned platform add-ons (AWS Load Balancer Controller, External Secrets Operator, EBS CSI gp3 StorageClass) and supporting infrastructure (ECR, DNS, SES with DKIM), with remote state versioned in S3.

   Cloud Infrastructure & DevOps

   stack

   AWSTerraformGitHub ActionsVercel

   • Provision and manage cloud infrastructure on AWS (VPC, ECS, ECR, RDS, ALB, Route53) using Terraform for repeatable, version-controlled deployments across 3 environments (Staging, UAT, Production).
   • Build and maintain CI/CD pipelines with GitHub Actions, enabling zero-downtime deployments with 3–5 releases per week.
   • Deploy Next.js applications on Vercel and manage application secrets securely.

   Government Social Welfare Platform

   stack

   KubernetesGitHub ActionsGitLab CIDockerArgoCD

   • Design and maintain CI/CD pipelines with GitHub Actions and GitLab CI for 5 microservices (Spring Boot + React), using change detection to selectively build and deploy only affected services.
   • Implement a GitOps workflow with ArgoCD and a dedicated infrastructure repo, automating Kubernetes manifest generation and achieving zero-downtime deployments.
   • Build multi-stage Docker images for Java and React services, including gzip pre-compression of frontend assets for optimized delivery via nginx.
   • Optimize Dockerfiles by splitting dependency install into a dedicated layer to leverage Docker layer caching, reducing build times by ~70%.
   • Manage GitHub-to-GitLab monorepo sync using git subtree, maintaining separate service repos for controlled release branching across Dev, UAT, and Production.
   • Set up HTTPS reverse proxy bridging for secure communication between internal services and external government APIs.

   Hospital Information System (HIS)

   stack

   AngularSpring BootNode.js

   • Develop Angular frontend features based on Figma designs from the UX/UI team, implementing complex business logic defined by Business Analysts.
   • Manage and maintain a microservices backend built with Spring Boot and Node.js.
   • Collaborate within a 15-member cross-functional team of frontend developers, backend engineers, BAs, and UX/UI designers.
2. 02

   Developer InternBluebik Vulcan Company Limited

   Nov 2024 – Mar 2025

   Legal Documents Management System

   stack

   ReactJSNestJSTypeScript

   • Collaborated with Systems Analysts to design features and translate requirements into implementation.
   • Built reusable UI components to improve consistency and reduce duplication across the application.
   • Wrote comprehensive unit tests to ensure code reliability and prevent regressions.
3. 03

   Full-Stack Developer InternTrienpont International

   Apr 2024 – Sep 2024

   Human Resource Management System

   stack

   Next.jsSupabaseTypeScript

   • Gathered requirements directly from HR stakeholders and collaborated with Senior Engineers to architect the solution.
   • Designed an optimized PostgreSQL schema with stored procedures for complex query logic.
   • Built a responsive, server-side rendered UI for improved performance and SEO.
   • Developed a custom Slack bot for daily standup reporting and leave requests, letting staff interact with internal tools directly from Slack.

   Crypto Game Reviews & News Platform

   stack

   Next.jsStrapiTypeScript

   • Maintained and enhanced a legacy codebase while improving page load performance and implementing new client-requested features.

   E-Commerce Product Data Scraper

   stack

   JavaScript

   • Reverse-engineered website APIs and built an automated data pipeline with cron jobs to extract and export product data to CSV for analytics.
4. 04

   Full-Stack Developer InternComputer Center, Burapha University

   Apr 2023 – Mar 2024

   E-Office Platform: 3 Internal Systems (User Management, Help Desk, IT-Clinic)

   stack

   NestJSVueJSTypeScript

   • Independently built three internal web applications end-to-end after gathering requirements from university administrative staff.
   • Integrated APIs with the university's complex legacy user database, ensuring secure access and optimized query performance.
   • Delivered all three systems on schedule as the sole developer, resolving technical challenges through self-directed research.

Languages

TypeScriptJavaScriptGoJavaHTMLCSSSQL

Frameworks

NestJSSpring BootEchoNext.jsReactJSVueJSAngular

Database

PostgreSQLMySQLOracleRedis

DevOps

AWSKubernetesArgoCDDockerTerraformGitHub ActionsGitLab CICloudflareVercel

Other

GitnginxTailwind CSSSupabaseJira