Roy Tseng Email & Phone Number

Singapore

Singapore

• Developed a payment service integrating with Adyen to automate transaction and payout reports based on Adyen notifications. (Ruby on Rails) • Migrated daily inventory snapshot from program-based execution to stored procedures, achieving over 50% performance improvement. (Ruby on Rails, SQL) • Implemented a scalable cost recalculation process using task management and batch execution, doubling efficiency for large record sets (100+ records). (Ruby on Rails) • Rewrote… Show more • Developed a payment service integrating with Adyen to automate transaction and payout reports based on Adyen notifications. (Ruby on Rails) • Migrated daily inventory snapshot from program-based execution to stored procedures, achieving over 50% performance improvement. (Ruby on Rails, SQL) • Implemented a scalable cost recalculation process using task management and batch execution, doubling efficiency for large record sets (100+ records). (Ruby on Rails) • Rewrote transaction syncing with Sidekiq batch processing, reducing queued retry workers by 80%. (Ruby on Rails) • Developed a monitoring script using AWS Lambda and Terraform for improved infrastructure observability. • Migrated the payment service to AWS EKS (in progress) Show less

Ho Chi Minh City, Vietnam

• Developed a cloud ERP system for enterprise clients, leading the inventory management system with FIFO costing and purchase order modules. (Ruby on Rails, React)• Developed a monitoring and notification system for CPU and memory usage, reducing outages and client complaints.(Prometheus)• Developed an automated sales reporting system, providing clients with item-level insights for bundled products to optimize offerings and marketing (Ruby on Rails, Golang, SQL)•… Show more • Developed a cloud ERP system for enterprise clients, leading the inventory management system with FIFO costing and purchase order modules. (Ruby on Rails, React)• Developed a monitoring and notification system for CPU and memory usage, reducing outages and client complaints.(Prometheus)• Developed an automated sales reporting system, providing clients with item-level insights for bundled products to optimize offerings and marketing (Ruby on Rails, Golang, SQL)• Improved reporting system performance by 80%, reducing page load times from minutes to seconds. (Golang, SQL)•Implemented a cloud application for daily inventory. snapshots, providing clients with historical data for informed stock management strategies. (Ruby on Rails, SQL)• Automated daily market basket analysis reports. (Python)• Spearheaded the development of a simple public API. (Ruby on Rails) Show less

Ho Chi Minh City, Vietnam

• Worked on a project to help 50 minimart clients improve their tobacco supply chain through data. (Go)• Built customized point-of-sales modules for SMEs. (Python, Javascript)• Resolved point-of-sale transaction issues on a Linux server, ensuring smooth business operations.

Taichung City, Taiwan