Joni Mertoniemi
Partner, Software Development Consultant at Luoto Company
Espoo, Finland
Summary
👤
Senior🎓
Top SchoolJoni Mertoniemi is a Partner and software development consultant in Espoo with 11 years of experience building full-stack web applications using React, TypeScript, JavaScript and Node.js. He has entrepreneurial roots as co-founder of a collaborative whiteboard product (Flinga) and has led development across startups and consultancies, combining hands-on coding with product sensibility. Joni’s work spans frontend and backend systems, cloud deployments (AWS, Docker) and Java-based services, with a practical focus on testability and reliability. An active contributor to open-source testing for the well-known PixiJS WebGL renderer, he has improved renderer cleanup, auto-resize behavior and WebGL detection in its test suite—illustrating a knack for subtle, quality-focused infrastructure fixes.
11 years of coding experience
11 years of employment as a software developer
Bachelor of Engineering (B.Eng.), Information Technology, Bachelor of Engineering (B.Eng.), Information Technology at Metropolia Ammattikorkeakoulu - Helsinki Metropolia University of Applied Sciences
Finnish, English
Github Skills (7)
webgl10
unit-testing10
javascript10
pixijs10
testing10
canvas9
renderer9
Programming languages (3)
Github contributions (5)
pixijs/pixijs
Oct 2014 - Nov 2014
The HTML5 Creation Engine: Create beautiful digital content with the fastest, most flexible 2D WebGL renderer.
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:6 commits in 6 days
Contributions summary:Joni primarily focused on improving the testing infrastructure for the PixiJS library. They fixed and refined the destroy method tests within the WebGLRenderer, ensuring proper cleanup. Further contributions involved adding an autoResize option for both CanvasRenderer and WebGLRenderer and updating the associated tests. The user also improved WebGL detection in WebGLRenderer tests.
gamefastesthtml5glsljavascript
sysart/sysart.fi-react
Feb 2016 - Mar 2021
Contributions:3 pushes, 2 comments, 11 issues in 5 years 2 months
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