John Elmer

Consolidated Whiz transaction history across microservices and integrated Whiz as a payment source, implementing incoming cashback flow and contributing to QRIS payment integration to enable seamless purchases in the Ajaib app.

Led decoupling of backend from legacy dependencies, achieving a ≥75% performance improvement, integrated multiple payment gateways with a Strategy Pattern, and helped reduce fraud attempts by 90% while maintaining 98% crash-free sessions.

Developed and maintained a bill-payment microservice achieving 98% crash-free sessions and 98% availability, and migrated core backend and OpenAPI services from Python to NodeJS to adopt a microservice architecture.

Led and mentored engineering teams to improve developer productivity and guided technical direction while collaborating with operations on data analytics to optimize business and feature decisions.

Improved booking distribution and schedule visibility to enhance partner retention and service quality, integrated e-money top-up and disbursement flows with Midtrans/BCA, and developed a financial report generator for operations.

Developed a custom accounting software solution for a bitumen manufacturing company to automate financial workflows and reporting.

Developed custom software to sort and filter potential clients for the sales team, improving lead targeting and sales efficiency.

Grade: 3.2 / 4.0

Activities and societies: Final project: Rete Algorithm Implementation on Healthy Food Recommendation Application.

Completed a Bachelor's Degree in Information Technology at Universitas Multimedia Nusantara from 2010 to 2014 with a GPA of 3.2/4.0. Final project: Rete Algorithm Implementation on Healthy Food Recommendation Application.