ChangZhuo Chen (陳昌倬)

I am staff engineer in Appier, where I have been tech lead in retargeting system for 5 years and main developer in SRE team in 1 year. My background is computer science, and have master degree in National Tsing Hua University.

In Appier, I have been learning prioritization, and using novel technologies to solve business problems with high resource constraints due to fast growing from series A to IPO. I also learn how to cooperate with people around the world via asynchronous communication as Debian Developer.

I am looking forward to seek new opportunity which can further expand my technical and leadership skills.

Working Experience

Staff Engineer, Appier, Taipei 2014-11 ~ present

Design and implement Retargeting Pipeline:
- Implement near real-time (< 5s), high throughput (avg 50k, max 750k QPS) stateful rule based matching engine for user behaviors retargeting via Apache Flink.
- Reduce 20% of cost via Kubernetes, and spot VM.
- Provide strategic advantage over competitors in iOS 14 IDFA-less privacy enhancement by low latency (P50 ~ 300ms) user id mapping via Apache Flink.
Design and implement GitOps platform, Common Application Platform for Operation Orchestration:
- Manage 700+ applications across 6 more teams in Appier via Argo CD, and Go template.
- Provide observability via auto Grafana dashboard, and OpenTelemetry infrastructure.
Design and implement Datafeed to sync product information from customers:
- Synchronize up to 6 billion product information per days across all customers via Celery.
- Improve 20% ~ 50% click-through rate via reducing advertising image size with guetzli.

Senior Engineer, Trend Micro, Taipei 2010-12 ~ 2014-11

Reduce 80% of time to generate scanning result via automatic scanning framework.
Reduce 99.99% of scanning time in VSAPI ARM via fixing GCC configuration.
Reduce 20% of scanning time in VSAPI Android via fixing build configuration.

Senior Engineer, BenQ/Qisda, Taipei 2006-10 ~ 2010-12

Increase auto test rate from 20% to 80% by new testing tool for GCF/PTCRB in Anite.

Open Source

Developer/Application Manager, Debian 2013-09 ~ present

Co-organize DebConf18, with 200+ participants globally to National Chiao Tung University for 2 weeks.
Maintain 140+ packages with more than 10 development groups.

Developer, 新酷音輸入法 2012-09 ~ present

Increase unit test coverage from 0% ~ 81%, and integrate with CI via travis-ci, coveralls.io, and coverity.
Implement 800 times faster dynamic programming based algorithm to enhance composition performance.

Skills

Languages:
- Mandarin (native)
- English (professional working proficiency)
Programming:
Frameworks:
Infra:

Education

Master, National Tsing Hua University, Hsinchu 2004-09 ~ 2006-07

Bachelor, National Chiao Tung University, Hsinchu 2000-09 ~ 2004-07