Eunseok Jeon
Backend Developer | Java & Spring Boot
Building scalable backend systems with clean architecture and modern technologies. Passionate about creating robust APIs and efficient data solutions.
@RestController
@RequestMapping("/api/v1")
public class BackendService {
@Autowired
private DataRepository repo;
@GetMapping("/data")
public ResponseEntity getData() {
return repo.findAll();
}
}About Me
Passionate about backend architecture and building scalable systems.
Clean Code
Writing maintainable and well-documented code following best practices and SOLID principles.
Data Solutions
Designing efficient database schemas and optimizing queries for high-performance applications.
Cloud Architecture
Building and deploying scalable applications on AWS with focus on reliability and cost-efficiency.
I'm a backend developer specializing in Java and Spring Boot, with a passion for creating robust and scalable systems. My expertise lies in designing RESTful APIs, implementing microservices architectures, and optimizing database performance. I enjoy tackling complex technical challenges and continuously learning new technologies to deliver high-quality solutions. With full-stack experience, I understand the entire development lifecycle and can collaborate effectively across teams to build exceptional products.
Education
Computer Programming
Seneca College
Toronto, Canada
Experience
Professional journey building scalable backend systems and leading technical projects.
Fullstack Developer
Biddingo
- ▹Designed backend and full-stack features using Java, Spring Boot, Angular, and AWS to support billing and vendor workflows in a production SaaS environment.
- ▹Architected recurring subscription and transaction-based payment workflows with retry logic and state management to ensure payment reliability and data integrity.
- ▹Resolved production issues related to payment states and backend workflows, restoring service stability and preventing recurrence.
- ▹Built a dynamic form builder with configurable schema generation and flexible data modeling, enabling runtime changes without database redeployment.
- ▹Optimized backend APIs and database queries to improve response consistency and system reliability under production load.
- ▹Deployed and monitored AWS services (EC2, S3, WAF), troubleshooting production incidents and supporting CI/CD releases.
Web Application Developer
Milal Church
- ▹Designed and built a full-stack membership management system serving ~2,000 users, migrating manual workflows into a structured digital platform.
- ▹Implemented dynamic search, CRUD operations, and relational data mapping to support administrative reporting and record management.
- ▹Developed conditional filtering and export functionality to streamline internal data analysis and operational tasks.
Software Development Tutor
Seneca College
- ▹Delivered instruction on core computer science fundamentals including object-oriented programming, database concepts, and systems programming using C, C++, and C#.
- ▹Provided one-on-one tutoring and group sessions to support students in understanding programming concepts and problem-solving techniques.
- ▹Assisted students during lab sessions by troubleshooting code issues and guiding them through practical programming exercises.
Featured Projects
A selection of recent projects showcasing backend development and full-stack capabilities.
Tech Stack
Technologies and tools I use to build robust and scalable applications.
Get In Touch
Have a question or want to connect? Feel free to reach out anytime.