Sohyeon Lee

Backend Developer

Backend Engineer with a focus on solving real-world backend challenges (Java / Spring).

I have hands-on experience analyzing and resolving issues related to transactions, performance, and architecture while designing scalable APIs.

This blog shares these problem-solving experiences and practical insights from production systems.

3 + Years of Experience

SHL Dev

Skills

Java

Main language
Currently used at work

Spring

Main framework
Currently used at work

Node.js

Backend runtime for [DoUNeedSchedule Project]

Mybatis

Basic CRUD
Recursive/Dynamic queries

JPA

Basic CRUD
JPQL & Native queries
Spring Data JPA

JavaScript

Basic functionality

React

Basic features (useEffect/useState etc.)
Used in [DoUNeedSchedule Project]

AWS

EC2
Used in [DoUNeedSchedule Project] & [Bowmeow Project]

Azure

App Service
Azure Function
Gateway
Currently used at work

Docker

DockerFile
Docker Compose
Used in multiple projects and current work

MySQL | MariaDB

Basic functionality
Routines (stored procedures & functions)
Currently used at work

MongoDB

Basic commands (CRUD)

Redis

Caching
Pub/Sub
Spring Data Redis
Used in [Ohguohgutalk Project]

Github | GitLab

Github currently used at work
GitLab used in government-funded training

Skills

History

Education & Experience

Real-time Exchange Rate Currency Calculator Web Project

Currency Calculator Web Project

YYYY.MM ~ YYYY.MM

Currency calculator web application using real-time exchange rate API
Check [Projects] section

Korea National Open University Computer Science

Korea National Open University Computer Science
Transferred to 2nd year, currently enrolled

2023.03 ~ Present

Expected graduation 2025.06
Transferred to 2nd year in 2023.03

WebSocket-based Web Messaging Platform Project

OhguOhgutalk Project

2023.02 ~ 2023.08

WebSocket usage and JPA, mongoDB learning project
Only works locally

React & Node.js Study and Project

DoUNeedSchedule Project

2022.05 ~ 2022.08

React course study and project with 2 team members
Frontend server (React) & Backend server (Node.js)

Government-funded IT Academy Completion

The Joeun Academy
Java Web Development & App Development
(Secure Coding, Docker) Training Course Completion

2021.10 ~ 2022.05

Java concepts during 7-month training period
Progressive development process of Spring and JDBC
Total 2 projects completed

Work Experience

HealthConnect Inc.

Healthcare B2B & B2C Service

2022.09 ~ Present

Backend Developer working on production systems
• Building scalable REST APIs with Java & Spring
• Handling transaction management & data validation
• Working with Azure cloud services (App Service, Functions, API Gateway)

History