John Paul Sim

Full-Stack Developer with 5+ years of experience building, enhancing, and maintaining business-critical web applications using PHP, Laravel, Vue.js, Alpine.js, MySQL, and Microsoft SQL Server. Experienced in RESTful API development, Eloquent ORM data modeling, secure validation, automated testing, real-time integrations, production defect resolution, and SQL query optimization. Proven ability to deliver end-to-end features for CRM and auction-reporting platforms while collaborating with lean agile engineering teams.

PHP Developer at MNLeistung Inc. (2025-03 – Present)

• Develop and enhance a large-scale CRM platform with 25+ core modules, including Leads, Contacts, and Opportunities, using Laravel, Alpine.js, and SQLSRV.
• Deliver end-to-end CRM features by connecting Laravel backend services, business rules, database operations, and reactive Alpine.js user interfaces.
• Optimize complex Microsoft SQL Server queries across CRM modules to improve data retrieval efficiency and reduce page-load delays for end users.
• Diagnose and resolve defects in legacy and newly implemented modules, improving system stability and protecting critical sales and lead-management workflows.
• Integrate Pusher-based real-time notifications and updates to improve responsiveness and maintain consistent data across active user sessions.
• Collaborate in a lean 2–4-person agile team to translate requirements into production-ready features, fixes, and continuous system improvements.

Junior Web Developer at HMR Philippines Inc. (2021-03 – 2025-03)

• Enhanced a 40+ module auction-reporting suite across three production applications using Laravel, Vue.js, and MySQL, supporting daily auction operations.
• Rebuilt user-interface components and integrated backend APIs for Auction, Auction Category, and Bidder Per Auction reports, improving full-stack data flow and usability.
• Implemented unit and feature tests across five core modules to reduce regression risk and protect critical auction workflows.
• Optimized complex MySQL queries across four or more reporting modules to improve load times and reliability in a high-volume auction environment.
• Refactored and modernized legacy modules to reduce recurring defects, improve maintainability, and strengthen secure-development practices.
• Improved backend data processing across the wider application suite and collaborated within a seven-person engineering team to deliver production enhancements.

Management Information Systems (MIS) Support at ICCT Colleges Foundation Inc. (2019-06 – 2020-03)

• Performed routine system maintenance and optimization to support reliable and secure office operations.
• Diagnosed and repaired hardware and printer issues, helping minimize equipment downtime for internal users.

Bachelor of Science in Information Technology (BSIT) – ICCT Colleges Foundation Inc. (2019)