Jim Rollenhagen
Senior Software Engineer at Stripe
Grand Rapids, Michigan, United States
Summary
👤
Senior🎓
Top SchoolJim Rollenhagen is a Senior Software Engineer in Detroit with 15 years building and operating large-scale, cloud-native systems, currently focused on observability and diagnostics at Stripe. He’s strongest in backend development and cloud infrastructure, with deep hands-on experience in Python and Go and a track record of migrating control planes to container platforms and scaling failure domains via cell-based architectures. A long-time OpenStack leader—PTL, core reviewer, and contributor to Nova, Ironic, DevStack and Kolla—he upstreamed features used to run millions of CPU cores and helped build Rackspace’s OnMetal bare-metal product. Jim is equally comfortable in DevOps and engineering leadership: he designs deployment pipelines, streamlines operational toil, and removes political and technical blockers so teams can move faster. He prefers remote or Southeast Michigan roles and brings a prolific open-source mindset combined with a practical, production-first approach to reliability and performance. An interesting quirk: he often pairs systems design work with hands-on fixes in deployment tooling, turning architecture ideas into repeatable, low-toil operations.
15 years of coding experience
13 years of employment as a software developer
BS, Computer Engineering, BS, Computer Engineering at Kettering University
Github Skills (33)
laravel-nova10
docker10
bare-metal10
python10
scripting10
configuration-management10
bash10
provisioning10
openstack-nova10
networking10
dockers10
metal10
iron10
automation10
script10
Programming languages (10)
Github contributions (5)
openstack/nova
Aug 2014 - Apr 2019
OpenStack Compute (Nova). Mirror of code maintained at opendev.org.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:38 commits in 4 years 8 months
Contributions summary:Jim primarily contributed to the OpenStack Compute (Nova) project, focusing on bug fixes and enhancements related to the Ironic bare-metal provisioning driver. Their work includes modifying architecture mapping for specific CPU types, fixing log level manipulation, and correcting capacity calculations within cells for drivers using an n:1 mapping. Additionally, the user addressed issues regarding reporting of resources and correct generation of the configdrive for instances on bare metal nodes, and also enabled multitenant networking and exposing resource classes.
openstack
openstack/kolla-ansible
Dec 2018 - Apr 2019
Ansible deployment of the Kolla containers. Mirror of code maintained at opendev.org.
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:19 commits in 3 months
Contributions summary:Jim primarily focused on enhancing the Kolla Ansible deployment by introducing service-specific configurations, including hostnames and listening ports, for various OpenStack services like Neutron, Glance, Nova, Keystone, and others. They implemented changes to allow differentiating between the port the service listens on and the port the service is reachable on, improving flexibility for external load balancers. Additionally, they refactored configurations to utilize keystone URLs consistently across multiple service configurations. These changes span multiple Ansible configuration files, templates and deployment definitions.
ansible
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