Jacob Chappell
Senior Software Engineer at lampo
Nashville-Davidson, Tennessee, United States
Summary
👤
Senior🎓
Top SchoolJacob Chappell is a Senior Software Engineer with 12 years of experience specializing in DevOps, GNU/Linux, embedded systems, and computer security. He has designed, deployed, and maintained mission-critical systems and protected confidential research data for hundreds of clients, combining systems-level engineering with practical security stewardship. At Ramsey Solutions he continues to ship backend software while contributing to notable open-source projects like the Floodlight SDN controller and Apptainer/Singularity, where he added IPv6 packet handling, SPUD decoding, and robust test infrastructure. Comfortable across the stack, he moves between low-level packet processing and test automation, ensuring reliable operation in complex environments. Colleagues rely on him for pragmatic problem solving and a readiness to learn new technologies. His background blending embedded and cloud-adjacent work gives him an uncommon ability to bridge hardware-near constraints with scalable software practices.
13 years of coding experience
University of Kentucky
Stackoverflow
127reputation
6kreached
10answers
0questions
Github Skills (21)
udp10
container10
singularity10
testing10
packet10
hpc10
java10
javas10
go10
ipv610
sdn9
reproducible-science9
unit-testing9
linux9
openflow9
Programming languages (12)
Github contributions (5)
apptainer/singularity
Nov 2018 - Jun 2019
Singularity has been renamed to Apptainer as part of us moving the project to the Linux Foundation. This repo has been persisted as a snapshot right before the changes.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:51 commits, 10 PRs, 48 comments in 7 months
Contributions summary:Jacob primarily contributed to the testing infrastructure and added tests for new features in the Singularity/Apptainer project, focusing on the `instance` commands and related functionalities such as `--app`. They implemented tests for `run` and `exec` commands, and created options structures for `start`, `list`, and `stop` instance commands. The user's work involved writing tests and modifying existing files, showcasing an understanding of the project's core functionalities.
apptainerlinuxcontainerscontainersingularity-container
floodlight/floodlight
May 2015 - Jun 2015
Floodlight SDN OpenFlow Controller
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 commits, 5 PRs, 8 comments in 1 month
Contributions summary:Jacob primarily contributed to the development of the Floodlight SDN OpenFlow Controller by implementing and modifying packet processing functionalities. This included the creation of an IPv6 packet structure and integrating it with existing Ethernet packets, as well as adding unit tests for IPv6 packets. Furthermore, they added the ability to decode SPUD packets within the UDP protocol. Additional contributions included minor code consistency improvements and refactoring efforts.
openflowsdn
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