James Hagerman
Senior Software Engineer at Celonis
United States
Summary
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RockstarJames Hagerman is a senior software engineer with over a decade of experience building full-stack systems, embedded firmware, and IoT solutions across startups and enterprise teams. Currently at Celonis, he combines backend and systems expertise with a strong hardware/firmware background from roles at Particle where he improved HAL security and made programmatic updates to device keys for widely used Particle Device OS targets. His career spans dataviz and WebGL work at Zoic to leading full-stack and prototype initiatives at 72andSunny, demonstrating fluency across cloud services, front-end engineering, and embedded platforms. James is comfortable owning reliability and deployment concerns—having run HA Linux infrastructure and managed AWS accounts—while shipping user-facing products and interactive experiences. He brings a pragmatic maker’s mindset to complex engineering problems, often bridging the gap between low-level device constraints and scalable software architectures. Colleagues rely on him for durable, security-minded solutions that move from prototype to production.
13 years of coding experience
14 years of employment as a software developer
Github Skills (15)
c1710
firmware10
iot10
embedded10
c-language10
cpp10
c1110
cprogramming-language10
sys10
cplus10
arduino10
particle10
microcontroller9
nrf528
stm8
Programming languages (17)
Github contributions (5)
particle-iot/device-os
Apr 2019 - Aug 2020
Device OS (Firmware) for Particle Devices
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:5 commits, 1 PR, 2 pushes in 1 year 4 months
Contributions summary:James made several contributions focused on updating and modifying the HAL (Hardware Abstraction Layer) for the Particle Device OS. These changes included updating how system configurations, specifically server keys and addresses, are set. The user also addressed potential security vulnerabilities by updating unsafe copy functions and allowing for setting the ALT server public key in DCT programmatically. These changes included implementing updates for multiple hardware targets.
xenonparticleargonelectronfirmware
JamesHagerman/Sensatron
Jun 2016 - Sep 2018
Contributions:1 release, 108 commits, 88 pushes in 2 years 3 months
lightingrig
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