• Built an API service with Django for payroll and hr system. The api handled 100k+ employee payrolls and employment contract signings per month.

• Created bulk processing logic with Pandas to reduce number of database queries. This relieved database deadlock issues and increased system throughput.

• Dockerized applications to standardize deployment processes and to support horizontal scalability.

• Deployed ELK (Elasticsearch, Logstash, Kibana) on AWS and configured multiple backend services to feed logs to Logstash. Achieved centralized logging, simplified debugging, and increased QA productivity.

• Implemented task queue with Celery and Redis to enable asynchronous jobs which improved user experience. This also integrated standalone cronjob scripts into the service as periodic tasks.

* Project team leader of a web CMS developed in Python, django, and MySQL which handled 15k requests per hour and managed more than 2 million records. Prioritized development and requirements

* Optimized program logic and enhanced throughput by more than 20x to relieve critical product bottleneck

* Revised inefficient database schema and optimized SQL queries which reduced response time by 10x

* Integrated message queue using Rabbitmq and Celery for asynchronous tasks to attain scalability

* Through code review, helped colleagues to tackle bugs and improve code quality and performance

* Developed iOS apps in Objective-C for Hong Kong’s top news apps: NextPlus, Sudden+, ME!, Ketchuper

* Refactored large codebases and added new features. e.g. deep linking and push notification

* Operated as Scrum Master; worked with UX designer for better interaction flows

* Provided POC on iOS/Android and project estimation for potential mobile app projects

* Developed Bluetooth data transfer functionality in HK 2016 Population Census Android app