Available for backend & full-stack work

Nuon Vakhim

Software Developer

Backend engineer building scalable services, microservices, and web portals for fintech and enterprise platforms.

Get in touchView experience
Years building software
3+
Primary stack
Java
Fintech platforms shipped
B2B

01 — About

Backend systems that hold up under real financial load.

Software Developer with 3+ years of software engineering experience specializing in scalable backend systems, microservices, and web portals. Proficient in Java, Spring Boot, PostgreSQL, REST APIs, and Next.js. Experienced across the full SDLC — Swagger API documentation, unit and integration testing, Dockerized services, and Agile collaboration with cross-functional and international teams.

Day to day that means designing schemas and queries that stay fast as data grows, wiring up authentication and role-based access, documenting APIs so other teams can move without asking, and shipping it all through Docker and CI/CD.

Languages

  • KhmerNative
  • EnglishGood

Interests

  • Researching emerging technologies
  • Learning and skill development
  • Building applications

02 — Skills

The stack I reach for.

Languages

  • Java
  • PHP
  • Golang
  • JavaScript
  • TypeScript

Frameworks

  • Spring Boot
  • Spring MVC
  • React.js
  • Next.js
  • Vue.js

Tech & Architecture

  • Microservices
  • REST APIs
  • Swagger
  • Docker
  • Jenkins
  • Unit & Integration Testing

Databases

  • PostgreSQL
  • MySQL

Tools & Workflows

  • Git
  • Subversion (SVN)
  • CI/CD
  • Figma
  • Agile

03 — Experience

Three years shipping backend services for fintech and enterprise.

  1. Software Engineer

    Jan 2024 — Present

    KOSIGN (Cambodia) Investment Co., Ltd.

    • Developed and maintained secure, scalable backend services in Java, Spring Boot, and PostgreSQL for financial and enterprise platforms, ensuring high availability and data integrity.
    • Implemented authentication and role-based access control with Spring Security and JWT.
    • Designed and optimized database schemas and SQL queries, improving transaction processing performance and ensuring data consistency.
    • Built reporting systems using JasperReports for PDF generation and automated delivery.
    • Delivered backend API services for billing, reporting, and enterprise payment workflows across web and mobile clients.
    • Deployed and maintained services with Docker on Linux servers, supporting CI/CD workflows.
    • Worked closely with Korean counterparts and international teams.
    • Developed and maintained a B2B fintech platform on an internal framework.
    • Accelerated development workflows and automated testing using Claude Code and Claude Harness.
    JavaSpring BootSpring SecurityPostgreSQLJasperReportsDockerJWT

  2. Freelance Software Developer

    Independent project

    Machinery Maintenance Bot System

    • Developed and deployed a Telegram bot system that monitors maintenance schedules for heavy machinery, letting users record service data and receive automated alerts for oil changes and part replacements.
    • Designed bot-based input workflows and maintenance tracking features to improve servicing efficiency and reduce equipment downtime.
    Telegram Bot APIBackend ServicesScheduling

  3. Trainee

    Jan 2023 — Dec 2023

    Korea Software HRD Center

    • Developed RESTful APIs and a social project with Spring Boot and React.js, delivering dynamic, high-performance user experiences.
    • Researched and implemented a private blockchain network using Hyperledger Fabric, Golang, and chaincode.
    • Collaborated on team-based projects following Agile development practices.
    • Designed UI/UX mockups and workflows in Figma.
    Spring BootReact.jsHyperledger FabricGolangFigma

04 — Projects

Selected work, from payment platforms to permissioned blockchain.

KOSIGN Investment

B2B Fintech Platform

Backend services for a business-to-business fintech platform built on an internal framework — billing, reporting, and enterprise payment workflows serving both web and mobile clients.

JavaSpring BootPostgreSQLDocker

Freelance

Machinery Maintenance Bot

A Telegram bot that tracks maintenance schedules for heavy machinery. Operators log service data through guided chat workflows and receive automated alerts for oil changes and part replacements.

Telegram Bot APIREST APIsAutomated Alerts

Korea Software HRD Center

Private Blockchain Network

Research and implementation of a permissioned blockchain network on Hyperledger Fabric, with chaincode written in Golang to model and validate on-chain transactions.

Hyperledger FabricGolangChaincode

05 — Education

Where I trained.

2021 — 2024

Bachelor's Degree of Computer Science

Royal University of Phnom Penh

2019 — 2020

High School Graduate

Hun Sen Sereypheab High School

06 — Contact

Open to backend and full-stack roles — let's talk.

Email
vakhimnuon@gmail.com
Telegram
@vakhimnuon
Phone
+855 96 553 1965
Website
vakhim-dev.site
Location
Krong Takhmau, Kandal Province, Cambodia
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