Stefan Schmaltz
Geschäftsführer at Checkbox IT GmbH
Waghäusel, Baden-Württemberg, Germany
Summary
🤩
Rockstar🎓
Top SchoolStefan Schmaltz is a seasoned software leader and entrepreneur with over 7 years of formal experience and a development career stretching back to the early 1990s. As Geschäftsführer of Checkbox IT GmbH and previously as CEO and lead developer at Softwareschmiede Höffl, he has steered product reinvention projects (KOMET → QOMET) and delivered bespoke software solutions as a long-time freelancer. Trained as a Dipl.-Inform. (FH) from FH Mannheim, he blends deep systems-level engineering with hands-on hardware interfacing and trading experience noted in his GitHub bio. Stefan is comfortable operating across the stack—from embedded and hardware-adjacent development to commercial software leadership—and excels at translating legacy systems into modern implementations. Based in Waghäusel, Germany, he brings entrepreneurial resilience and a pragmatic focus on sustainable, maintainable codebases. An understated strength is his continuity: multi-decade involvement with the same core product line reflects rare domain knowledge and commitment.
7 years of coding experience
Dipl. Inform. (FH), Informatik, 1,6, Dipl. Inform. (FH), Informatik, 1,6 at FH MannheimStaatlich geprüfter Datentechnischer Assistent, Fachhochschulreife, Staatlich geprüfter Datentechnischer Assistent, Fachhochschulreife at Werner-von-Siemens-Schule Mannheim
German, English
Github Skills (65)
representations10
ocpp10
pv10
solar10
battery10
sunspec10
delay10
modbus10
golang9
home-automation9
beagle9
ubl9
mqtt8
zugferd8
vms8
Programming languages (8)
Github contributions (5)
opensprinklershop/OpenSprinkler-App
Jul 2019 - Feb 2025
A mobile interface for the OpenSprinkler irrigation device. Designed to allow manual control, program management (preview, add, edit, and delete), initiation of a run-once program, viewing graphical and tabulated representations of log data, viewing device status, adjusting rain delay, and changing of OpenSprinkler settings.
Contributions:3 reviews, 10 PRs, 154 pushes in 5 years 8 months
program-managementrepresentationsstatusandroiddelay
opensprinklershop/OpenSprinkler-Weather
May 2022 - Mar 2025
OpenSprinkler weather service used to calculate watering scale for the OpenSprinkler Unified Firmware.
Contributions:1 PR, 22 pushes in 2 years 11 months
firmwarescalewateringcalculateopensprinkler
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