Built and maintained core features for the billing platform, internal web services and automation tools for data synchronization using Ruby on Rails; supported Finance and Customer Support teams; built automated data sync tools; integrated third-party APIs and internal systems; applied unit testing (RSpec) and clean architecture principles; implemented Kafka for asynchronous processing and GraphQL for internal data queries; authored RFCs and technical documentation; served as Engineer PIC for 1–3 initiatives per quarter; advocated functional programming patterns and mixin usage; recognized with the “Customer First” Award.

Maintained and enhanced APIs for the mobile app and POS; managed and optimized Node.js microservices; integrated and maintained multiple payment gateways; implemented engagement tools and Elasticsearch; maintained internal web services using PHP (CodeIgniter); adhered to MVC and clean coding principles; integrated systems to support in-store and in-app transactions.

Built and maintained APIs for logistics, coffee delivery, courier mobile apps, locker rental web app, and luggage delivery systems using Django, Node.js, and Flask; developed integration APIs collaborating with Fore Coffee and Traveloka engineering teams to connect platforms and ensure performance.