Chaleampol Treeboon (Teelek) | Senior Full-Stack .NET Engineer

Executive Summary

Senior Full-Stack Engineer & Modernization Specialist with 12+ years of experience in the C# .NET Ecosystem.

Designed and developed end-to-end systems, covering upgrades, migrations, and new implementations. Managed the full process from Requirement Gathering, System Analysis & Design to presenting Prototypes.

Executed planning and development for SIT, UAT, Security Testing, and Go-Live. Successfully delivered over 25 projects on both On-premise and Cloud Platforms (Azure, AWS) using Manual and Automated CI/CD. Ready to leverage AI Integration to enhance business value, delivering stable, secure, and scalable solutions.

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Technology and Skills

Frontend

HTML5 CSS3 JavaScript (ES5, ES6+) jQuery AJAX AngularJS Vue.js

Backend

C# .NET .NET Core .NET Framework ASP.NET Core ASP.NET MVC RESTful API Design OData API .NET Worker Service

Databases

SQL Server PostgreSQL Oracle MySQL MongoDB

Architecture

Monolithic Microservices 3-Tier Event-Driven Architecture Asynchronous Processing System Decoupling API Gateway RabbitMQ Dependency Injection Repository Unit Of Work

Cloud & DevOps

Microsoft Azure AWS Docker Linux / Ubuntu Windows Server / IIS Jenkins GitLab CI/CD GitHub Actions Traefik / Cloudflare Azure API Management Azure Container Apps

Auth & Security

OAuth 2.0 OpenID Connect (OIDC) Active Directory JWT PKCE Auth0 / Keycloak Azure Key Vault Secure Secret Management

SDLC & Tools

Agile / Scrum / Waterfall UX/UI Prototyping UML / Use Case VS Code / Visual Studio Git / GitHub / GitLab / Bitbucket Jira / Trello Miro / Draw.io / Visual Paradigm

Automated Testing & 3rd Party

E2E (Playwright) xUnit Moq Testcontainers Postman / Newman MUI / Bootstrap / Kendo UI Open AI ChatGPT / Gemini API FlowiseAI

Professional Experience

Export-Import Bank of Thailand

Dec 2025 – Present (Contract)

Senior Full-Stack Developer

Migrated legacy ASP.NET WebForms to a modular architecture using .NET Core 7, implementing Domain-Driven Design (DDD) and CQRS patterns to address EOS/EOL and Security Vulnerability Assessment (VA) requirements.
Upgraded ETL Workflows (SSIS) from version 2008 to 2022, resolving compatibility issues and optimizing performance.
Conducted Proof of Concept (PoC) for migrating SSIS workloads to Microsoft Fabric.
Upgraded Apache and PHP server environments to mitigate security vulnerabilities and ensure compatibility with Laravel and Moodle.

Fujitsu (Thailand)

Aug 2023 – Jul 2024 (Contract)

Senior Full-Stack Developer

Upgraded legacy systems and developed new solutions for Mizuho Bank to comply with ISO 20022 standards, following SA specifications.
Delivered weekly progress reports and status updates to the Project Manager.

HUA SENG HENG

Mar 2023 – Jun 2023 (Full-time)

Senior Full-Stack Developer (New BU)

Designed prototype for an online TFEX account opening system, reducing registration time to 5-8 minutes.
Automated the import and reporting of daily closing stock prices, replacing manual processes with Line Notify integrations.

Asia Plus Securities

Apr 2021 – Feb 2023 (Full-time)

Senior/Lead Full-Stack Developer

Led the development of the Staff Disclosure system to reduce paper usage and ensure compliance with SEC regulations. Planned Software Design Patterns and provided team consultation.
Designed and developed the QR Payment Service for securities deposits and subscriptions.
Designed and developed APIs for Bitkub API, FX data, and Implied Vol to retrieve values.

Honda Leasing (Thailand)

Aug 2020 – Mar 2021 (Contract)

Senior Full-Stack Developer

Designed and developed the "Contract Closing Control" system, a full-cycle workflow for closing customer vehicle lease contracts, improving speed and reducing errors.
Modified the existing system to support vendor-provided E-Tax systems.

King Tech Soft

Jul 2019 – Mar 2020 (Full-time)

Founder / Full-Stack Developer

Developed "Smart Booking System" using QR codes for Muang Boran and Erawan Museums. Handled 200,000+ transactions and integrated POS & E-Tax modules.
Developed online condo booking deposit system integrated with K-Bank Payment Gateway.

GEC Service (PTT Group Vendor)

Mar 2018 – Jun 2019 (Contract)

Senior Programmer

Developed workflow automation systems like PTTEP Smart Procurement and PTT Smart Contract according to SA specifications.

PTT Digital

Jun 2017 – Feb 2018 (Contract)

Senior Programmer

Developed "Digital Ask" Microservice and Auth Server for SSO, and improved Risk Assessment & Inventory systems.

GM CORP

Dec 2013 – May 2017 (Full-time)

Programmer / Business Dev Specialist

Developed Credit Bureau Automation (CIMB) and foreign currency exchange POS system for Asia Exchange Samrong.
Designed and developed various internal organizational tools (Payslip, Travel Reimbursement, Time Backward).

Previous Roles (Early Career)

Oct 2010 – Nov 2013

IT Support & SEO / Web Developer

Thai Textile Industry PCL: Provided computer/network support and developed an automated system for managing computer specification data.
Siamwebthai: Optimized client websites for Top 10 Google ranking. Developed automated web systems and managed hosting.

Recent Upskilling & Projects

Serverless & Backend Evolution

Dec 2025 – Present

Architecting high-efficiency cloud systems with zero maintenance.

Serverless Migration: Overhauled Azure VM (IaaS) to Serverless/PaaS, slashing costs and operational workload.
Cloud-Native Migration: Moved containers to Azure Container Apps with scale-to-zero capability.
Message & Security: Implemented CloudAMQP (RabbitMQ) and Azure APIM with Managed Identities.

AI RAG & SEO Optimization

Dec 2025 – Present

Modernizing user experience and search discoverability.

Frontend Rebuild: Redesigned portfolio with modern UI/UX on Cloudflare Pages for global speed.
SEO & AIO: Fully optimized for Google Search and AI Search engines.
Database Migration: Moved VectorDB and data tables from Azure PostgreSQL to Supabase.

Reliability & Performance PoCs

Dec 2025 – Present

Exploring advanced engineering patterns for high-scale systems.

Caching & Search: Implemented Redis and Elasticsearch/Kibana Read Models for reporting.
Monitoring: End-to-End performance tracking via K6, Grafana, and Prometheus.
High Availability: Simulated HA PostgreSQL with Read Replicas in Docker environments.

Cloud-Native & DevSecOps

Apr 2025 – Sep 2025

Zero-Trust infrastructure with fully automated delivery pipelines.

Secure Ingress: Wildcard SSL and Cloudflare Tunnels (Zero-Trust) with Traefik routing.
Automation: Jenkins & GitHub Actions CI/CD with automated Test Pyramids.
Core Services: Secure deployment of Keycloak Auth and RabbitMQ message brokers.

Custom Microservices & AI RAG

Apr 2025 – Sep 2025

Integrating Large Language Models into enterprise-grade backends.

AI Integration: Built RAG flows with VectorDB and custom OAuth 2.0 for GPT extensions.
Backend: Engineered .NET 8 RESTful APIs and MongoDB data stores.
Security: Managed Identity and Federated Credentials with Azure Key Vault security.

Education & Training

Education

B.Sc. in Information Technology Southeast Bangkok College, 2015
Higher Diploma in Information Technology Attawit Commercial College, 2012
Vocational Certificate in Business Computer Attawit Commercial College, 2010

Certifications

Greatfriend Business Development (2015)
- Essential Object-Oriented System Analysis & Design
- Essential OOP and Design Patterns
- Building AngularJS Applications
Technical Training Center (2014)
- Querying Microsoft SQL Server 2012

Get in Touch

Interested in collaborating, modernizing your systems, or integrating AI? Drop me a line below and I'll get back to you as soon as possible.

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