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Kaung Sett Hein

@kaungsetthein

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Full-stack engineer with 4+ years delivering end-to-end features across TypeScript, PostgreSQL, and Java/C#.

Netherlands

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What I'm looking for

I’m looking for a team where I can own end-to-end features—frontend + backend APIs—using strong PostgreSQL performance practices, TDD/CI/CD, and practical AI-assisted workflows, while shipping reliably in an agile environment.

I’m a full-stack engineer with 4+ years delivering end-to-end features across TypeScript, PostgreSQL, and Java/C#. I enjoy owning both frontend interfaces and backend APIs, turning requirements into stable, scalable systems.

Most recently, I built and owned Java (Quarkus) microservices for outbound communication workflows, integrating Microsoft Graph API, Twilio, and SMTP into a versioned state schema for multi-tenant clients. I also optimized PostgreSQL queries using CTEs to reduce redundant joins and improve performance in complex relational structures.

I work with a quality-first mindset—applying TDD with JUnit 5 and Mockito, and maintaining automated test pipelines through Docker, Maven builds, and GitLab CI/CD. I’ve also contributed to AI-assisted backend workflows by integrating OpenAI APIs into data processing pipelines to improve developer velocity and output quality.

Earlier, I led frontend development for three Vue.js B2B web applications, improving engagement by 25% and reducing onboarding time for new developers. On the backend, I developed RESTful APIs using ASP.NET Core (.NET 6+) with EF Core and MSSQL, improving data retrieval efficiency by 20%, and writing tests with xUnit to reduce system bugs by 15%.

Experience

Work history, roles, and key accomplishments

Backend Developer

Phinion

Nov 2024 - Oct 2025 (11 months)

Built and owned Quarkus-based Java microservices for outbound communication workflows, integrating Microsoft Graph API, Twilio, and SMTP into a versioned multi-tenant state schema. Optimized PostgreSQL queries using CTEs and improved release stability with Docker, Maven builds, and GitLab CI/CD, while integrating OpenAI APIs into backend data processing workflows.

Quarkus Microservices PostgreSQL Mockito Docker Gitlab CI OpenAI API

Full Stack Developer

Technopro Engineering

Jun 2023 - May 2024 (11 months)

Debugged and improved React/TypeScript frontend components integrated with Java Spring Boot APIs, stabilizing reporting features by resolving API data issues. Validated and corrected MySQL data to reduce recurring data inconsistencies by ~15% and used AI-assisted tools to accelerate ticket resolution.

React TypeScript Spring Boot Data Validation Reporting Stabilization

Full Stack Developer

Fusion Solution Co., Ltd

Jul 2020 - Aug 2022 (2 years 1 month)

Led frontend development for three Vue.js B2B web applications, improving engagement by 25% and reducing onboarding time for new developers through component architecture. Developed RESTful APIs with ASP.NET Core (.NET 6+), EF Core, and MSSQL, improving data retrieval efficiency by 20%, and reduced system bugs by 15% with unit testing using xUnit.

Vue.Js ASP.NET Core EF Core MSSQL RESTful APIs xUnit Unit Testing Agile Delivery

Internship

Thorium Co., Ltd

Aug 2019 - Jun 2020 (10 months)

Built responsive React-based user interfaces using HTML, CSS, Bootstrap, and JavaScript to support the company web portfolio. Contributed to backend features using C#, ASP.NET MVC, and .NET Core with MSSQL and PostgreSQL, assisting with application design and relational database modeling under senior guidance.