Maintained internal apps built with CodeIgniter and jQuery, then single-handedly rebuilt E-Space, the internal trade promotion management platform for Nivea and Hansaplast, as a Laravel 12 REST API with a React SPA, including migrating legacy data such as 9,000+ product group records and 200+ distributors. Built promocard planning with baseline, incremental and ROI calculation, multi-level approval workflows, company budget tracking, and distributor claim management with tax/VAT handling. Implemented Azure AD single sign-on via SAML 2.0, role-based access control, and Redis queue jobs for large Excel import/export and PDF generation. Developed a distributor claim portal with a separate authentication guard and idempotent synchronization into the main system.

Built, developed and maintained web applications using Django. Integrated third-party RESTful APIs such as Satusehat and created middleware for hospitals to send patient tuberculosis reports using the SITB API. Integrated the BCA payment gateway API using Django, ensuring secure and efficient payment processing for transactions. Created comprehensive unit tests using Django to ensure the reliability and accuracy of the application's functionalities.

Built and developed apps with Node.js, Golang and Laravel. Managed server infrastructure on AWS and DigitalOcean, including virtual machines, Docker and databases. Led tech stack decisions for tools, programming languages and databases.

Developed and maintained the ObelixHills website and ticketing system using Laravel and Vue.js, handling thousands of daily transactions through performance monitoring, troubleshooting and optimization. Built SIPLah, a procurement web app for education units, using Laravel with Midtrans payment gateway integration.