Open to New Opportunities & Projects

Hello, I amKritsana Wathaniyanon

Senior Mobile & Backend Engineer specializing in high-performance Cross-Platform Mobile Apps with Flutter and robust scalable Microservices with Go (Golang).

View My Projects GitHub Profile

Kritsana Wathaniyanon

Mobile & Backend Software Engineer

~/kritsana — zsh

❯

Years Experience

20+

Completed Projects

100%

Production Ready

◆ Flutter◆ Dart◆ In-App Purchase◆ Provider / Bloc◆ Camera & ML Kit◆ PDF Generation◆ Golang◆ Echo Framework◆ PostgreSQL (pgx/v5)◆ Transaction Manager◆ Uber Zap Logger◆ RBAC Security◆ JWT Refresh Rotation◆ golang-migrate◆ Redis Rate Limit◆ OpenTelemetry◆ Prometheus◆ Multi-tenant SaaS◆ Next.js (App Router)◆ React◆ TypeScript◆ Tailwind CSS◆ shadcn/ui◆ React Hook Form◆ i18n (TH/EN)◆ Docker◆ Kubernetes (K8s)◆ Kustomize◆ GCP Cloud Run◆ Cloud Storage◆ Artifact Registry◆ AWS ECS / EKS◆ Cloudflare DNS◆ GitHub Actions CI◆ Trivy◆ golangci-lint◆ k6 Load Testing◆ Play Store Release◆ AI Agent Workflows◆ Flutter◆ Dart◆ In-App Purchase◆ Provider / Bloc◆ Camera & ML Kit◆ PDF Generation◆ Golang◆ Echo Framework◆ PostgreSQL (pgx/v5)◆ Transaction Manager◆ Uber Zap Logger◆ RBAC Security◆ JWT Refresh Rotation◆ golang-migrate◆ Redis Rate Limit◆ OpenTelemetry◆ Prometheus◆ Multi-tenant SaaS◆ Next.js (App Router)◆ React◆ TypeScript◆ Tailwind CSS◆ shadcn/ui◆ React Hook Form◆ i18n (TH/EN)◆ Docker◆ Kubernetes (K8s)◆ Kustomize◆ GCP Cloud Run◆ Cloud Storage◆ Artifact Registry◆ AWS ECS / EKS◆ Cloudflare DNS◆ GitHub Actions CI◆ Trivy◆ golangci-lint◆ k6 Load Testing◆ Play Store Release◆ AI Agent Workflows

01 // Core Competencies

Technical Expertise

Mobile Development

End-to-end iOS & Android mobile application development with Flutter, Clean Architecture, and full Google Play In-App Purchase / Subscription integration.

FlutterDartIn-App PurchaseProvider / BlocCamera & ML KitPDF Generation

Backend & Microservices

Designing resilient REST APIs and multi-tenant SaaS backends with Go Echo and Strict 3-Layer Architecture — JWT refresh rotation, rate limiting, migrations, and observability with OpenTelemetry & Prometheus.

GolangEcho FrameworkPostgreSQL (pgx/v5)Transaction ManagerUber Zap LoggerRBAC SecurityJWT Refresh Rotationgolang-migrateRedis Rate LimitOpenTelemetryPrometheusMulti-tenant SaaS

Web & Frontend

Building web applications with Next.js App Router and TypeScript — from SaaS dashboards to multilingual sites — shipped as containers.

Next.js (App Router)ReactTypeScriptTailwind CSSshadcn/uiReact Hook Formi18n (TH/EN)

DevOps & Cloud Ecosystem

Containers on GCP Cloud Run and Kubernetes, CI/CD with security scanning, load testing, domain & SSL management, and multi-agent AI workflows to accelerate delivery.

DockerKubernetes (K8s)KustomizeGCP Cloud RunCloud StorageArtifact RegistryAWS ECS / EKSCloudflare DNSGitHub Actions CITrivygolangci-lintk6 Load TestingPlay Store ReleaseAI Agent Workflows

02 // Featured Works

Selected Projects

ImmiSync

A B2B SaaS platform for tracking and managing foreign worker legal compliance in Thailand, with multi-tenancy and collaboration between employer HR teams and employment agencies.

Multi-tenant: Employers ↔ Agencies (Many-to-Many)
Passport, Visa, Work Permit, Pink Card, TM30 & TM47 tracking
White-label LINE Official Account per tenant
Go Echo + PostgreSQL 16 + Next.js on GCP Cloud Run

Visit Live Site

KSN Scanner Pro

An intelligent document scanner mobile application featuring edge detection, perspective distortion correction, PDF generation, and Google Drive cloud sync.

Perspective Auto-Crop & Advanced Image Filters
Google Play Subscription & In-App Purchase Flow
Dynamic Bilingual Localization (EN / TH)
Automated Semantic Versioning & Build Scripts

Inspect Project Code

Enterprise Go Microservice

Enterprise-scale backend services structured under Strict 3-Layer Architecture (Handler, Service, Repository) engineered for high concurrency.

pgx/v5 Atomic Transaction Manager
Distributed Context Tracing & Latency Tracking
PII Masking & Data Privacy Compliance
Kubernetes Liveness & Readiness Probes
Choose Redis, email and deploy target (Cloud Run, GKE, ECS, EKS) at generation

Enterprise Production

Developer Tooling & Pipelines

Developer productivity tooling for Flutter App Bundles, automated version increment CLIs, and automated database migration pipelines.

Auto Increment App Bundle Version CLI
Docker Multi-stage Optimized Builds
Automated Play Store Privacy Policy Sync

View All Projects on GitHub

03 // Contact

Let's Build Something Great Together

Looking to build a state-of-the-art Flutter mobile app, architect high-throughput Go backend microservices, or need technical consulting? Feel free to reach out!

Send Email (kritsana.dk@gmail.com) GitHub: KritsanaDK