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Yasa Yap

@yasayap

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I build reliable enterprise banking systems, optimize databases, and deliver end-to-end software solutions.

Indonesia

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What I'm looking for

I'm looking to build reliable enterprise software, improve backend performance and database efficiency, and collaborate with product, frontend, and business teams on practical end-to-end solutions.

I've built and supported enterprise banking applications at PT Prima Master Bank for more than 15 years, spanning backend and full-stack engineering.

As a Backend Engineer, I optimized SQL and IBM DB2 queries to reduce monthly reporting time by 15%, developed integrations for HRIS and BI-FAST operations, and improved system uptime by 97% through production root-cause analysis.

I turn complex operational workflows into practical software, from credit-approval engines and APIs to UI/UX flows in Figma. I work across Node.js, Go, Python, Java, PHP, .NET, JavaScript, TypeScript, and relational and NoSQL databases.

Experience

Work history, roles, and key accomplishments

Backend Engineer

PT Prima Master Bank

Jan 2020 - Jan 2026 (6 years)

Optimized SQL and IBM DB2 queries, reducing monthly reporting time by 15%. Developed backend integrations for enterprise projects, including automated HRIS and BI-FAST real-time banking operations.

SQL IBM DB2 Performance Optimization Stored Procedures Query Tuning HRIS BI FAST Credit Risk CICSA CRR Root Cause Analysis API Integration UAT SIT Backend Development

FullStack Engineer

PT Prima Master Bank

Jan 2011 - Jan 2020 (9 years)

Engineered backend business logic and high-performance database queries for mission-critical internal banking systems. Architected automated credit-approval workflows and led UI/UX design initiatives for internal applications.