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I'm a Backend Developer with 2+ years of experience building scalable, high-performance applications using Java (Spring Boot). I'm passionate about API development, database optimization, cloud services, and system security. I enjoy solving problems and collaborating with cross-functional teams to deliver impactful software solutions.…

Junwin Cong

Back-End Developer, Web Developer, Programmer

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I'm a Backend Developer with 2+ years of experience building scalable, high-performance applications using Java (Spring Boot). I'm passionate about API development, database optimization, cloud services, and system security. I enjoy solving problems and collaborating with cross-functional teams to deliver impactful software solutions.…

Available to hire

I’m a Backend Developer with 2+ years of experience building scalable, high-performance applications using Java (Spring Boot).
I’m passionate about API development, database optimization, cloud services, and system security. I enjoy solving problems and collaborating with cross-functional teams to deliver impactful software solutions.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Work Experience

IT Staff at RSIA Stella Maris

June 1, 2025 - December 1, 2025

Contributed to the development and continuous improvement of key hospital systems, including EMR, Nursing Support tools, and other web applications. Built and enhanced backend features using PHP (CodeIgniter & Laravel) with MS SQL Server, focusing on clean architecture and scalable code. Worked closely with a small, fast-paced dev team to translate user pain points into functional, high-impact features. Improved system stability by performing deep debugging, refactoring legacy code, and optimizing complex SQL queries. Supported deployments and ensured smooth operation of production systems used daily by medical staff.

Backend Developer at PT GEMA INOVASI TEKNOLOGI

March 1, 2023 - December 1, 2024

Streamlined API integration for seamless communication between frontend and backend systems. Developed RESTful APIs that facilitated seamless data exchange. Managed and optimized efficient SQL queries and data transport. Integrated third-party authentication (Keycloak) and external APIs, enhancing security and interoperability. Contributed to comprehensive documentation, facilitating faster onboarding for new team members.

Backend Developer Intern at PT IDSTAR CIPTA TEKNOLOGI

March 1, 2022 - February 1, 2023

Developed scalable and maintainable APIs for seamless integration with frontend components. Wrote high-quality, optimized code, meeting customer requirements and business objectives. Continuously monitored system performance and proactively identified areas for optimization, ensuring consistent application reliability.