I am a Java developer specialising in Spring Boot, microservice architecture, and backend integration for large banking and financial systems. Across my career I have designed and tuned high-throughput APIs that handle millions of daily transactions under strict availability requirements.
Working across major banks and enterprise IT consultancies has given me a close understanding of banking regulatory expectations, from transaction data security and encryption to audit trail handling, alongside middleware integration, clean code practice, and CI/CD automation.
The best software comes from favouring simplicity, testable code, and solid architectural fundamentals. That is what keeps a system stable once it reaches production.
Experience
Feb 2023 to now
Backend Developer
PT Infosys Solusi Terpadu
- Design, build, and maintain backend microservices for core banking and national electronic payment systems using Spring Boot and Java.
- Tune PostgreSQL performance through query optimisation, advanced indexing, and JPA/Hibernate adjustments, cutting query overhead by up to 35%.
- Apply event-driven architecture with Apache Kafka for asynchronous, near real-time reconciliation of financial transaction data.
- Implement OAuth2, Spring Security, and JWT payload encryption to secure data exchange between microservices.
Aug 2019 to Feb 2023
Backend Developer
PT Mitra Integrasi Informatika
- Developed enterprise backend services and middleware for clients across banking, logistics, and insurance.
- Designed reliable RESTful APIs, documented them with OpenAPI and Swagger, and ran load testing on a regular cycle.
- Used Docker for containerisation and deployed services into Kubernetes clusters across staging and production.
- Integrated legacy SOAP services with modern REST-based platforms using Spring Integration.
Oct 2019 to Dec 2020
Frontend Developer
PT Bank Negara Indonesia (Persero) Tbk
- Designed and built internal and customer-facing banking interfaces with a focus on accessibility, performance, and responsiveness.
- Worked alongside UI/UX designers and backend engineers to wire secure API endpoints into frontend dashboards.
- Met banking web security standards, including mitigation for common issues such as XSS and CSRF.
Technical expertise
Languages and frameworks
Java, Spring Boot, Spring Security, JPA and Hibernate, SQL.
Databases and messaging
PostgreSQL, MySQL, Redis, Apache Kafka, Flyway.
Architecture and DevOps
REST APIs, microservices, Docker, Kubernetes, GitHub Actions.
Methodology and testing
Clean Architecture, test-driven development, JUnit 5, Mockito, MockMVC.
Selected impact
- API performance work
- Optimised primary banking API endpoints, cutting response time by up to 40% and holding throughput during peak transaction hours.
- Securing banking middleware
- Applied payload encryption, secure tokenisation, and OWASP mitigations across middleware services.
- Microservices migration
- Moved legacy monolithic modules onto a Spring Boot and Apache Kafka architecture for asynchronous communication.
- Test automation coverage
- Grew unit and integration coverage with JUnit and Mockito past 85%, measurably reducing production defects.
Education
2015 to 2020
Universitas AMIKOM Yogyakarta
Bachelor of Information Systems. GPA 3.85 of 4.00.
Served as a computer laboratory assistant.