Mike Opima
I’m a back-end focused developer who enjoys designing REST APIs, relational schemas, and data-access layers.
About
I’m a back-end focused developer who enjoys designing REST APIs, relational schemas, and data-access layers. I build and maintain production services primarily with C#/ASP.NET Core and PHP/Laravel (SQL Server), and I bring strong Java experience from owning the database and DAO layer on a small team—skills I’m now applying in Spring Boot and Spring Data JPA.
I like taking features from requirements through API and persistence design to deployment, and then supporting improvements based on real usage. Alongside my client work, I’ve built projects like a Booking API and a warehouse management system, and I’m continuously improving how I structure layered services, dependency injection, and ORM mappings for maintainable back-end systems.
- Joined November 2026
Industry experience
- Software & Internet
- Computers & Electronics
- Financial Services
Work experience
Worked on a three-developer warehouse management system using Java (JavaFX) with Gradle and MySQL. Owned the database and data-access layer: designed a six-table relational schema, wrote the DDL, implemented a column-constant layer, and created the Category DAO. Supported application UI development by building Supplier and Cart JavaFX panes on top of the data layer.
Develop end-to-end client web applications including requirements gathering, REST API and database design, deployment, and ongoing support. Build back-end services in C#/ASP.NET Core and PHP/Laravel backed by SQL Server, with Angular front ends consuming the APIs. Delivered a cafe booking/admin portal in about 4 weeks by replacing a manual process that previously took about 9 weeks; also implemented automatic price adjustments to reduce a previously time-consuming workflow.
Education
Certifications and awards
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