Sander Koenders
Software Engineer at Team Rockstars IT
Arnhem, Gelderland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolSander Koenders is a full-stack software engineer with 11 years of experience building scalable cloud-native applications and consulting on modern web infrastructure. He specializes in AWS, web technology infrastructure, and security, and is known for turning complex problems into simple, maintainable solutions. His background includes multi-year consultancy roles and hands-on engineering across gaming platforms, customer login systems, and transport software, reflecting a strong operational mindset in production environments. An active contributor to open-source testing tooling, he modernized parts of the widely used Stryker mutation-testing project by introducing async/await and TypeScript upgrades. Based in Arnhem, Netherlands, Sander combines continuous learning with pragmatic engineering to improve system efficiency, reliability, and developer experience.
11 years of coding experience
7 years of employment as a software developer
bachelor of ICT, Web Development, bachelor of ICT, Web Development at Hogeschool van Arnhem en Nijmegen
Dutch, English
Stackoverflow
196reputation
37kreached
4answers
10questions
Github Skills (25)
javascript10
testing10
typescript10
mutation-testing10
typescript-types10
typescripts10
test-automation10
flow-control9
test-framework9
work-flow9
control-flow9
jsx9
react9
jestjs9
flowtype9
Programming languages (12)
Github contributions (5)
stryker-mutator/stryker-js
Jan 2017 - Jul 2019
Mutation testing for JavaScript and friends
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:82 commits, 44 PRs, 79 pushes in 2 years 5 months
Contributions summary:Sander primarily focused on fixing typos and refactoring the codebase to utilize newer Typescript 2.1 constructs, including the introduction of async/await functionality and compiler flags. They also added support for the React JSX and Flow. These commits reflect a focus on improving code quality and modernizing the project's codebase. The user also corrected a few typos, which resulted in better code readability, and made the karma runner exit with a valid exit code
avatest-automationmutationmutation-testingjavascript
sanderkoenders/docker-spotweb
Dec 2019 - Apr 2023
Spotweb in a docker image
Contributions:1 PR, 6 pushes, 1 branch in 3 years 4 months
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