Kazuki Shimizu - Customer Engineer at PLAID, Inc.

Kazuki Shimizu

Customer Engineer at PLAID, Inc.

Tokyo, Japan

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Summary

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Rockstar

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Top School

Kazuki Shimizu is a Customer Engineer based in Tokyo with 12 years of software experience and a strong open-source footprint in the Spring and MyBatis ecosystems. He pairs practical system engineering and project leadership—having led end-to-end development, testing, and user documentation—with deep backend expertise contributing to core projects like Spring Framework and Spring Security. His contributions include adding meta-annotation support, improving data access return types, and enhancing MyBatis-Spring integration, demonstrating comfort working inside widely used, high-impact Java frameworks. Transitioning from system development to customer-facing engineering, he focuses on solving client problems such as workflow inefficiencies and disaster-time information flow using cloud and integration skills. Trained as a mechanical engineer (MSc, Kumamoto University), he brings a methodical, test-driven approach and a habit of improving developer ergonomics and configuration flexibility that isn’t obvious from his job title alone.

12 years of coding experience

2 years of employment as a software developer

Master's degree, Mechanical Engineering, Master's degree, Mechanical Engineering at Kumamoto University

English

Stackoverflow

Stats

409reputation

76kreached

15answers

1question

Github Skills (62)

application-framework10

git10

spring10

back-end-development10

apidoc10

testing10

selenide10

app-framework10

configuration-management10

spring-data10

authentication10

user-authentication10

spring-security10

mybatis10

spring-mvc10

Programming languages (6)

JavaShellScalaGoHTMLGroovy

Github contributions (5)

mybatis/jpetstore-6

May 2016 - Jun 2022

A web application built on top of MyBatis 3, Spring 3 and Stripes

Role in this project:

Full-stack Developer

Contributions:328 commits, 103 PRs, 179 pushes in 6 years 1 month

Contributions summary:Kazuki primarily contributed to integration tests and refactoring the existing codebase. They upgraded dependencies such as Mockito and updated to newer APIs. They also introduced integration tests using Selenide for screen transition verification and optimized the build process by changing the browser to headless Chrome. Furthermore, they refactored the code to use AssertJ and improved the tests overall.

spring-bootmysqlweb-applicationspring-mvcspring

mybatis/spring

Feb 2016 - Dec 2022

Spring integration for MyBatis 3

Role in this project:

Back-end Developer

Contributions:15 releases, 16 reviews, 402 commits in 6 years 10 months

Contributions summary:Kazuki primarily contributed to the Spring integration for MyBatis 3 project by implementing features related to direct configuration of `SqlSessionFactoryBean` without the need for a configuration file. This included adding new tests for the functionality and refactoring code to support configuration through properties. The user also fixed javadoc errors and other minor improvements.

spring-bootmysqlspring-integrationspring-jdbcspring

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