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鄭揚翰 Yang Han Cheng
Backend Engineer
Certificate: CISSP
Email: [email protected]
I am a backend engineer with many years of experience. My primary programming languages are Golang, Java, and Python, and I have extensive experience in designing and implementing microservices architecture. Outside of work, I am passionate about diving, which reflects my love for exploring the unknown and fuels my enthusiasm for new technologies and challenges.
Relevant Skills
Program Language
- Golang
- Java
- Python
- JavaScript
Dev
- Docker
- K8s
- Argo
- Grafana
- Shell Script
- NATS
- GCP
SQL/No SQL
- PostgreSQL
- Elasticsearch
- Vector DB
- Redis
Others
- LLM RAG
- AI Application
- Jira
- Deep Learning Recommendation Model
Work History
Sr. Software Engineer
Playsee
Mar. 2024 - Jul. 2024
Taipei, Taiwan
Led a team of three in developing an AI agent with memory, resulting in a 200% improvement in response time.
Reduced GPU cost per token by 30% through carefully evaluating and selecting cost-efficient machines.
Reduced the rate of incorrect recommendations by up to 90%.
Streamlined project workflows by integrating Jira with Slack, reducing team reporting time by 50%.
Achieved a 95% on-time delivery rate by effectively managing the team's timeline and aligning efforts with project goals.
skillset: Python, Golang, gin, GCP , Pub/Sub, Grafana, container, Gitlab CI/CD, vector DB, langchain, LLM, RAG, word embedding
Software Engineer
Vertiv Taiwan
Aug. 2021 - Mar. 2024
Taipei, Taiwan
- Led the upgrade of a Java-based product framework and conducted code reviews to ensure a seamless handover process.
- Represented my team in cross-border collaborations with overseas colleagues.
- Established a knowledge-sharing group to encourage active discussions and share insights on database best practices within the team.
- Earned CISSP certification to deepen security expertise in software development and strengthen system reliability.
skillset: Python, Java, Golang, gRPC, Protobuff, Nats, Struts, PostgreSQL, container, Gitlab CI/CD
Software Engineer
Gorilla Technology
Nov .2017 - Aug. 2021
Taipei, Taiwan
- Optimized search responses for a Java-based service using caching strategies, reducing latency from 10 seconds to 600 milliseconds.
- Spearheaded the introduction of unit testing, driving test coverage from 0% to 60%.
- Designed and implemented a cryptocurrency tracking system that processes and stores 8TB of transaction records with Elasticsearch and Logstash.
- Led the implementation of a click prediction system using the Deep Learning Recommendation Model (DLRM).
- Utilized Jenkins for CI/CDs.
- Introduced Kubernetes and built the environment on-premise
skillset: Java, Python, Flask, Springboot, container, Jenkins, SQL Server, PostgreSQL, Elasticsearch, logstash, Redis, Kubernetes
Web platform developer
Neteboom
Dec. 2016 - Aug. 2017
Taipei, Taiwan
- Utilized vanilla PHP to develop the Restful API for the web platform.
- Developed web crawlers using PHP to collect information for itinerary planning, and storing the data in MariaDB.
skillset: PHP, MariaDB, Linux
Education
2014 - 2016
TamKang University
Master of Computer Science and Information Engineering
GPA 3.9/4
Shih Chien University
Bachelor of Business Administration in Information Management
鄭揚翰 Yang Han Cheng
Backend Engineer
Certificate: CISSP
Email: [email protected]
I am a backend engineer with many years of experience. My primary programming languages are Golang, Java, and Python, and I have extensive experience in designing and implementing microservices architecture. Outside of work, I am passionate about diving, which reflects my love for exploring the unknown and fuels my enthusiasm for new technologies and challenges.
Relevant Skills
Program Language
- Golang
- Java
- Python
- JavaScript
Dev
- Docker
- K8s
- Argo
- Grafana
- Shell Script
- NATS
- GCP
SQL/No SQL
- PostgreSQL
- Elasticsearch
- Vector DB
- Redis
Others
- LLM RAG
- AI Application
- Jira
- Deep Learning Recommendation Model
Work History
Sr. Software Engineer
Playsee
Mar. 2024 - Jul. 2024
Taipei, Taiwan
Led a team of three in developing an AI agent with memory, resulting in a 200% improvement in response time.
Reduced GPU cost per token by 30% through carefully evaluating and selecting cost-efficient machines.
Reduced the rate of incorrect recommendations by up to 90%.
Streamlined project workflows by integrating Jira with Slack, reducing team reporting time by 50%.
Achieved a 95% on-time delivery rate by effectively managing the team's timeline and aligning efforts with project goals.
skillset: Python, Golang, gin, GCP , Pub/Sub, Grafana, container, Gitlab CI/CD, vector DB, langchain, LLM, RAG, word embedding
Software Engineer
Vertiv Taiwan
Aug. 2021 - Mar. 2024
Taipei, Taiwan
- Led the upgrade of a Java-based product framework and conducted code reviews to ensure a seamless handover process.
- Represented my team in cross-border collaborations with overseas colleagues.
- Established a knowledge-sharing group to encourage active discussions and share insights on database best practices within the team.
- Earned CISSP certification to deepen security expertise in software development and strengthen system reliability.
skillset: Python, Java, Golang, gRPC, Protobuff, Nats, Struts, PostgreSQL, container, Gitlab CI/CD
Software Engineer
Gorilla Technology
Nov .2017 - Aug. 2021
Taipei, Taiwan
- Optimized search responses for a Java-based service using caching strategies, reducing latency from 10 seconds to 600 milliseconds.
- Spearheaded the introduction of unit testing, driving test coverage from 0% to 60%.
- Designed and implemented a cryptocurrency tracking system that processes and stores 8TB of transaction records with Elasticsearch and Logstash.
- Led the implementation of a click prediction system using the Deep Learning Recommendation Model (DLRM).
- Utilized Jenkins for CI/CDs.
- Introduced Kubernetes and built the environment on-premise
skillset: Java, Python, Flask, Springboot, container, Jenkins, SQL Server, PostgreSQL, Elasticsearch, logstash, Redis, Kubernetes
Web platform developer
Neteboom
Dec. 2016 - Aug. 2017
Taipei, Taiwan
- Utilized vanilla PHP to develop the Restful API for the web platform.
- Developed web crawlers using PHP to collect information for itinerary planning, and storing the data in MariaDB.
skillset: PHP, MariaDB, Linux
Education
2014 - 2016
TamKang University
Master of Computer Science and Information Engineering
GPA 3.9/4