Senior Backend Engineer with 14+ years of experience building scalable backend systems, authentication platforms, and AI-powered services.
I focus on robust architecture, clean APIs, and practical AI integration in production environments.
- Design and build backend systems using Java / Spring Boot
- Architect authentication and authorization systems (OAuth2 / OIDC / JWT)
- Develop scalable REST APIs and cloud-native services
- Integrate LLM / AI features into real-world products
- Refactor legacy systems and improve system reliability
- Mentor engineers and support technical decision-making
- Building AI-powered requirement analysis and PRD generation systems
- Designing multi-step LLM pipelines for software development workflows
- Implementing Spring Authorization Server based authentication platforms
- Developing cloud-based services and backend architectures
Backend
- Java
- Spring Boot
- Spring Security
- JPA / Hibernate
- REST API Design
Cloud / DevOps
- AWS
- Docker
Database
- MySQL
- PostgreSQL
Frontend
- React
- TypeScript
AI / Integration
- OpenAI API
- LLM Integration
- Vector Database
- RAG Architecture
- Location-aware running service that provides real-time running guidance based on air quality and environmental conditions
- Built a web-based running assistant using public environmental data (air quality, ozone, fine dust)
- Designed location-based logic to map user coordinates to nearest monitoring stations
- Implemented real-time running safety index calculation and visualization
- Focused on practical health and safety decision support for runners
- Developed a system that analyzes user prompts and generates MVP applications
- Designed requirement extraction and structured PRD generation pipeline
- Integrated LLM-based workflow automation
- Built batch systems for multi-cloud resource monitoring
- Developed cost analytics dashboards and alerting systems
- Refactored legacy systems for performance and maintainability
