Jan Siero
APM Lead at Siero QA Performance
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolJan Siero is an experienced APM Lead and consultant with 11+ years delivering performance engineering, CRM implementations, and monitoring solutions across public sector, banking, and enterprise clients from Berlin. He blends hands-on load and performance testing (LoadRunner, JMeter, Gatling, k6) with practical CI/CD and monitoring integrations—having built Gatling SQL protocols, JMeter-based infrastructures, and CI pipelines in Bamboo. As a longtime SuiteCRM back-end contributor he has fixed encoding and export bugs and added relationship-field support, demonstrating deep PHP and CRM internals expertise. Jan runs his own consultancies focused on CRM and performance testing, enabling teams through documentation, training, and test automation. Currently he architects synthetic monitoring and alerting for a German ministry, translating monitoring concepts into ITSM workflows. He’s equally comfortable in low-level performance tuning and higher-level process design, a combination that helps uncover non-obvious bottlenecks and operational risks before they impact users.
11 years of coding experience
3 years of employment as a software developer
Master of Science - MS, Electrical, Electronics and Communications Engineering, Master of Science - MS, Electrical, Electronics and Communications Engineering at Eindhoven University of TechnologyCertificates, SOCIAL SCIENCES, Certificates, SOCIAL SCIENCES at Tilburg UniversityUPC Universitat Politècnica de Catalunya
English, Dutch, German, Spanish, Catalan, French
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (7)
php10
suitecrm10
mysql9
database-design9
workflow-engine8
apidoc7
api7
Programming languages (4)
Github contributions (5)
salesagility/SuiteCRM
Aug 2014 - Jun 2020
SuiteCRM - Open source CRM for the world
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 50 commits, 38 PRs in 5 years 10 months
Contributions summary:Jan's contributions primarily involve modifying PHP code within the SuiteCRM framework to address compatibility issues, improve export functionality, and add support for relationship fields. Their work includes refactoring code to align with PHP 5.4 compatibility, translating dropdown fields, enhancing the export process, and implementing features related to relationship fields within the CRM's data structures. Additionally, the user addressed various bugs, including character encoding problems and issues related to compose buttons and subpanels.
casescontactsmauticquotescrm
JanSiero/SuiteCRM-Outlook-Plugin
Jun 2018 - Jan 2023
Contributions:6 pushes, 1 branch in 4 years 7 months
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