I will add features to your existing spring boot web app

J
joey_jeon
J
joey_jeon
Dongyoun J

About this gig

I help businesses improve existing Spring Boot web applications by adding practical backend features and enhancing current workflows.


This Gig is a good fit for:

- review or comment systems

- member/account-related features

- status-based business logic

- admin-side feature additions

- backend API extensions

- workflow improvements inside an existing system


I work best on projects where the application already exists and you need a specific feature added cleanly and reliably.


Typical examples:

- adding review, comment, or like functionality

- extending member or authentication-related flows

- implementing status, point, or reward logic

- improving admin-side controls and backend endpoints

- updating database structure for a new feature


I usually work with Java and Spring Boot, and I focus on practical implementation, clean logic, and maintainable code.


Please message me first if:

- your request includes multiple large features

- the project needs major architecture redesign

- the scope is not yet clearly defined


Get to know Dongyoun J

Dongyoun J

Spring Boot Backend Developer for Admin Tools and API Integrations

  • FromSouth Korea
  • Member sinceMar 2026
  • Languages

    English, Korean, Japanese
Backend engineer with 4.8 years of experience improving production web systems. I specialize in admin panels, Spring Boot backend development, API integrations, workflow automation, and feature additions for existing services. I build stable and maintainable systems that help businesses improve operations, reduce manual work, and launch practical MVPs quickly.