mikelue.github.io

This is https://gh.mikelue.guru/, please visit the site to gather detail of my career and lastest update.

Check my GitHub: @mikelue, side projects:

• mikelue/jmisc - Some Java utilities/libraries I developed for my work, related to Spring Framework(Core, Data), JPA.
• mikelue/valor-code - Has an imaginary project developed by Spring Framework(Boot, Data/JPA, Data/Cassandra, Message/Kafka) and PostgreSQL/Cassandra/Kafka.
• mikelue/jdata-unit-test - For self-learning of lambda usage of Java, this project is an imitation of Apache DBUnit.
• mikelue/go-misc - Some GoLang utilities/libraries I developed for my work, related to Ginkgo, Gorm, and a bit of imitation of Spring Framework of Java.
• mikelue/vim-maven-plugin - A VIM plugin for Maven.

My Email Address: mike.lue0627@msa.hinet.net

You can check summary.

Some documentations I used in my work can be found at mikelue/mikelue.github.io.

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TOC

• Career
• Hit History
• Education
• Else

Some experiences I’ve faced

Software development:

• Software development must have three things, definition, implementation, and testing, whatever developing process you take.
• Most programmers struggle between implementation and testing, rare programmers make good definition.
  • Definition is about make your problem simple, not choose your solution as complex as possible.
  • Implementation is about loyal to specification and deal with the abstraction leaking of IT.
  • Testing is composed of the tests human can do and the ones only computer can do.
• Workaround is always unworthy, unless your don’t have to maintain the code anymore(as criminal as I think).

Data design:

• Coding is like starting relationship with someone, data design is like running marriage.
• Lost your code is trivial, lost system data is death sentence.
  • Coding is about correction with sensible algorithms.
  • Data design is about using the least logical I/O to reach your function, whatever you are using SQL or NoSQL databases.
• An algorithm is same however much times you run it.
• A database is not the same one after time passes(like marriage).
• Change code is easy(test, building, restart container), change data is hard(when and how to change).
• When data have bugs, the cost for debugging and fixing is larger than code.

Testing:

• Software quality is like onion, outer layer(front-end) depends on inner layer(back-end).
• The cost to debug in inner layer is larger than in outer layer.
• Unit tests slice the layers for quality insurance.
• You may cost 10x developing time for writing unit testing, but you will definitely run the tests more than 10 times.
• The benefits of unit tests
  • Make sure basic quality for next release version (40%)
  • Make sure the upgrading of compiler/libraries on which your software depends is safe (20%)
  • Refactoring existing code without fear(20%)
  • Quickly rule out some suspected problems while your are debugging (20%)

Documentation:

• Writing something for helping yourself to recall the things you might forget in future.
• Writing something for helping others who might take over your code but he or she is unable to contact you directly.
• Something is better than nothing.

Stuffs affect my design principles

From nowhere:

• “When specification is lost, all is lost”
• “An ounce of prevention is worth a pound of cure.” - Benjamin Franklin

From The Art of SQL, 978-0596008949:

• “Successful data modeling is the disciplined application of what are, fundamentally, simple design principles.”
• “The sad truth is that when you are beginning to be acknowledged as a skilled SQL tuner, people will not seek your advice until they discover that they have performance problems.”

Other books:

• “Schema optimization and indexing require a big-picture approach as well as attention to details.” - High Performance MySQL

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Career

Senior Programmer(backend)

重量科技股份有公司 KryptoGo Inc.
Aug 2020 ~ Aug 2021(1 year)

Responsible for Product: KYC(Know You Client), CDO(Customer Due Diligence) system

Main responsibilities:

• Take over existing system
• Plan of system architecture
• Design and implement backend service

What I did:

• Build parser to parse juridical verdict to build index for searching.
  • Improve search speed from almost 10 minutes to real time
• Design concurrent web crawling for web page from Google engine
• Simplify architecture(micro-service) of existing system, and that brought decrease in 50% billing(GCP).

Coding

• Java Stack: Java 13, Maven, Reactor, Jackson JSON
  • Use reactive programming(reactor)
  • Spring Framework Stack: Boot, WebFlux, JPA, Redis
  • Security by Spring Framework: Security over WebFlux, Session(Redis)
  • Testing: JUnit5, AssertJ, Jmockit
• Go Stack: GoLang 1.16
  • Gin, GORM, Go-Resty
  • Testing: Ginkgo, Gomega
• Databases: PostgreSQL(served by GCP CloudSQL), Redis(self-maintaince by GKE), MongoDB(self-maintaince by GKE), Liquibase
• Queuing: RabbitMQ
• CI: Github actions

SRE

• CI: Github CI(action)
• SRE Stack: Kubernetes, Kustomize(micro-services, redis, RabbitMQ) served by GKE
• Network: Cloudflare

Knowledge management

• Confluence, JIRA, Trac
• Markdown, AsciiDoc

Misc

• Bash

Senior Programmer(backend)

Archkite Media
Jun 2019 ~ May 2020(11 months)

Responsible for Product: Online booking system like airbnb

Main responsibilities:

• Plan of system architecture
• Design and implement backend service

Coding

• Java Stack: Java 11, Maven, Jackson JSON
  • Use reactive programming(reactor)
• Spring Framework Stack: Boot, WebFlux, JPA, Cassandra, Redis
• Security by Spring Framework: Security over WebFlux, Session(Redis)
• Databases: PostgreSQL(served by AWS RDS), Cassandra, Redis(served by AWS Elastic Cache), Liquibase
• Queuing: Kafka
• Testing: JUnit5, AssertJ, Jmockit
• CI: Gitlab CI, Github actions

SRE

• SRE Stack: Docker
• AWS Stack: ECS, EC2, VPC, CloudMap, Load Balance, Route 53
• Network: Let’s encrypt

Knowledge management

• Trac
• Markdown, AsciiDoc

Misc

• Bash

Senior Programmer(backend)

香港商翱鶚股份有限公司台灣分公司(Cepave Inc.) Taipei City(R.O.C. Taiwan)
Dec 2015 ~ Mar 2018(2 years and 4 months)

Company Product: OWL(Distributed monitoring system for CDN)

What I did:

• Mentor colleague
  • To fix a cron job(every 5 minutes), which consumed 100% MySQL resources and could not be finished in 5 minutes, as a dozen of seconds runtime and the resource usage of MySQL server was barely noticed.
  • Use both time window(1 minute) and data size(N) to make batch insertion of data, which improved write throughput and decreased data dead lock of MySQL.
• Design a DSL to query metrics reported from monitored hosts.
• Design and implement NQM(network quality management) service.
  • Maintain and transfer from existing PHP-NQM system to OWL system.
• Simplify architecture(micro-service) to make SQL in single place, which eased the work of operators.

Worked on:

1. Owl-Backend(OWL Core):
   • Languages: Golang, Bash
   • Databases: MySql
   • Frameworks/Libraries: Beego, Gin, Gentleman, Ginkgo
   • GoLang Tools: Vendor, Github CI, PEG(GoLang CC)
   • Other Tools: Maven, Liquibase, YAML, Docker
2. Cassandra API Service(OWL subsystem):
   • Feature: data service of NQM(Network quality management)
   • Languages: Java
   • Databases: Cassandra
   • Frameworks/Libraries: SpringFramework(Core, Web MVC, Boot), jmockit, JUnit, TestNG, Java Bean Validation(JSR-380)
   • Other Tools: Maven, Liquibase, Docker
3. New-Design of alert core(OWL subsystem)
   • Language: Java
   • Databases: PostgreSQL, Kafka
   • Queueing: Kafka
   • Frameworks/Libraries: SpringFramework(Core, Web MVC, Boot), jmockit, SLF4j(logback), JMX, TestNG, JUnit, Java Bean Validation(JSR-380)
   • Other Tools: Maven, Liquibase, Docker

Engineering for:

1. Back-end design and architecture reforming.
2. Database(RDB, Cassandra) design and performance evaluation
3. Design and implementation for Web MVC framework

Improvements and Guiding:

1. Plan and adopt conventions for RESTful API.
2. Plan and adopt coding guidelines for automatic testing.
3. Plan and adopt coding guidelines for automatic testing on stateful service/module.

Senior Programmer(backend)

博諾資訊(Bonopoints Inc.) Taipei City(R.O.C. Taiwan)
Mar 2014 ~ Jul 2015(1 year and 5 months)

Company Product: coupon/member management for small business(triggered by RFID)

What I did:

• Build whole back-end services.
• According my manager, I was the key man for time deliver of service on schedule.

Worked on back-end system:

• Languages: Java
• Databases: Google Data Store
• Cloud services: GAE(Google Application Engine)
• Frameworks/Libraries: SpringFramework(Core, Web MVC, Boot), JPA(JSR-338), Java Bean Validation(JSR-303), Shiro, Jersey(JAX-RS), JUnit, TestNG, jmockit
• Other Tools: Maven, Liquibase

Engineering for:

1. Back-end design and architecture reforming.
2. Database(RDB) design and performance evaluation

Improvements and guiding:

1. Plan and adopt conventions for RESTful API
2. Plan and adopt coding guidelines for automatic testing(JUnit, TestNG)
3. Plan and adopt coding guidelines for automatic testing on stateful program/module(JUnit, TestNG)

Senior Programmer(backend)

傳諦股份有限公司(FenzyTV Inc.). Taipei City(R.O.C. Taiwan)
Mar 2013 ~ Oct 2013(8 months)

Company Services: Community for TV Program

What I did:

• Build deploy flow(Java Web Container, TDD) to ensure quality of rolling-out service.
• Author documentation of RESTful API

1. Back-end: Spring Framework(Core, Web MVC), JPA(JSR-317), StringTemplate, JAX-RS, Java Bean Validation(JSR-303), MySQL, Shiro
2. Cloud Services: RDS, EC2

Improvements and enhancements:

1. Plan and adopt on testing framework(JUnit, TestNG) and database evolution(Liquibase)
2. Plan RESTful services(JSON) conventions and specifications

Senior Programmer(backend)

原點科技有限公司(Bluetang Ltd.) Taipei City(R.O.C. Taiwan)
Fab 2011 ~ Jul 2012(1 year and 6 months)

Company Services: Online schemaless-database service(like AWS SimpleDB)

What I did:

• Build data-warehousing service, which was on time-dimension.

Worked on:

1. Web site
   • Web Tech: FreeMarker, StringTemplate, HTML, CSS, JavaScript
   • Backend Tech: SpringFramework, JAX-RS, JPA(JSR-317), Java Bean Validation(JSR-303), Shiro
   • Data Warehousing/Mining: PostgreSQL, MySQL
   • Cloud Services: AWS(RDS, EC2)
2. Android: Client module of advertisement service for mobile system

Improvements:

1. Plan design disciplines of RDB data model

Programmer

義美聯合電子商務股份有限公司(I-Mei Multimedia e-Content Production & Marketing Inc.) Taipei City(R.O.C. Taiwan)
Apr 2010 ~ Fab 2011(11 Months)

Company: P2P platform of E-Books

What I did:

• By TDD, ensured whole team could output fine software quality.
• Use HTTP library to hack DRM system in order to implement DRM for eBooks(the DRM system has no API).
• According to government agent, we were the only one company that there aws no error when demonstrating system.

Worked on:

1. Web site
   1. Web Tech: SpringFramework(Web MVC), FreeMarker, StringTemplate, HTML, CSS, JavaScript
   2. Backend Tech: SpringFramework(Web MVC), Java Bean Validation(JSR-303), JPA(JSR-317), MySQL, PostgreSQL
2. DRM integration
   1. By hacking approach(with HTTP client)
3. Adopt well-defined design principals of RDB data model
4. Plan coding convention by TDD(TestNG)

Programmer

肯心資訊股份有限公司(Canthink Inc.) Taipei City(R.O.C. Taiwan)
Fab 2005 ~ Dec 2009(4 years and 11 months)

Company Product: E-Learning system

What I did:

• According to my manager, the disciplined method to design database has decreased the number of bugs significantly.
• Figure out the reason of memory leak of ASP engine that we could use a simpler way to update script without rebooting IIS.

Worked on:

1. Core development: ASP(.Net), MS SQL Server
2. Databases: MS SQL Server
3. Web: HTML, JavaScript, CSS, IE-specific tech

Development of libraries/frameworks from scratch:

1. Logging library
2. ORM framework

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Hit history

• 2005 ~ 2009(Canthink Inc.)
  1. I figured out the reason of memory leak for ASP engine.
• 2009 ~ 2011(I-Mei Inc.)
  1. First time I designed a full-stack system.
  2. I learned some principal of compiler.
• 2011 ~ 2012(Bluetang Ltd.)
  1. First time I used modern cloud services.
• 2013(FanzyTv Inc.)
  1. I experienced benefits of automatic tests.
• 2014 ~ 2015(Bonopoints Inc.)
  1. My manager said that my integrity is the most valuable characteristic of me.
• 2015 ~ 2018(Cepave Inc.)
  1. I became mentor of other programmers without organization position.
  2. First time I used compiler-generator to build DSL.
• 2020 ~ 2021(KryptoGo Inc.)
  1. My boss said that I like the Tim Duncan, who is retired player of NBA.

I also have some experiences on Perl and PHP programming languages.

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Education

龍華科技大學(Lunghwa University of Science and Technology)
資訊管理系(Department of Information Management)
1999 ~ 2003

Internship of Maintenance Department:

1. Maintenance on computer hardware
2. Network configuration and network maintenance

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Else

Following list are the closed down companies I had worked for.

• 香港商翱鶚股份有限公司台灣分公司(Cepave Inc.)
• 博諾資訊(Bonopoints Inc.)
• 傳諦股份有限公司(FenzyTV Inc.)
• 原點科技有限公司(Bluetang Ltd.)
• 肯心資訊股份有限公司(Canthink Inc.)