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Hengly Siev
Hengly Siev
About Me

Hengly Siev

Building Your Digital Foundation.

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Get in touch Résumé (PDF)

Introduction

I'm a software developer who builds production-grade systems across backend, web, and mobile. My toolkit: Node.js/TypeScript, Flutter, Spring Boot, PostgreSQL/MongoDB, and DevOps with Docker and GitLab CI. I care about clean domain models, RBAC and auditability, offline-first experiences, and DX that keeps teams fast.

5+
Years Exp
5+
Projects
100%
Job Success
24h
Response Time

Story

I started with a simple goal: build useful software and make it reliable. That focus pulled me through backend, frontend, and now mobile work—connecting business intent to stable, observable releases. I favor clean boundaries (DTOs, Mappers, Services, Repositories), strong validation and logging, and instrumentation so issues are easy to detect and fix.

Today, I'm a developer at fintech Pi Pay company while delivering freelance software development services under StackBloc.

While my professional role at Pi Pay focuses on backend and frontend systems, I have independently engineered complex mobile applications with Flutter, building full-featured e-commerce platforms, hotel booking systems, and crypto trackers that demonstrate deep backend integration and business logic.

My philosophy: ship thoughtfully, measure outcomes, iterate with discipline, and keep a high bar for code quality. Those are the systems teams can trust and scale.

Work Experience

Pi Pay (Fintech, Cambodia)
Feb 2022 — Present
Back End Developer
  • Developed high-volume backend APIs and Web Portals using **Java Spring Boot** and **PHP**.
  • Integrated **PostgreSQL** and **Oracle** databases for efficient data storage and retrieval in a complex financial environment.
  • Implemented secure RESTful APIs for backend systems, ensuring compliance and data integrity.
  • Improved system performance, scalability, and resilience for high-volume transactions.
Tech Intelligent Modernization
May 2021 — Jan 2022
Software Developer
  • Developed and maintained secure, scalable accounting systems using **C# Asp.Net** and **Asp.Net Core MVC**.
  • Integrated **MSSQL Server** databases for efficient data storage and retrieval.
  • Improved system performance, scalability, and resilience for high-volume transactions.
The Corner Soft
Mar 2018 — Apr 2021
Software Developer
  • Developed core business logic for accounting software using **C# Asp.Net** and **Asp.Net Core MVC**.
  • Integrated **MSSQL Server** databases, optimized stored procedures, and reporting queries.
  • Ensured high performance and reliability for critical financial data processing.
IOTA Asia Company
Dec 2015 — Feb 2018
Software Developer
  • Developed and maintained web applications using **PHP Laravel Framework** technologies.
  • Designed and optimized **MySQL Server** databases for complex system workflows.
Population Services International (PSI)
Jul 2013 — Nov 2015
MIS Assistant
  • Verified all data after entry in the **DHIS2** System to ensure accuracy.
  • Prepared monthly reports for supervisors to support data-driven decisions.
  • Queried data from **SQL Server** for ad-hoc and scheduled organizational reporting.

Technical Skills

TypeScriptReactNext.jsNode.jsExpressSpring BootPostgreSQLDockerFlutter
Let's Collaborate

Let's build something together!

Contact →Résumé (PDF)