Summary of Experience:
Over 10 years as a software engineer, on moderate- to large-scale projects. Have worked on real-time data acquisition systems, embedded systems running RTOS and Linux, Linux and HP/UX device drivers for PCI devices, a SCSI device driver, communications protocols, interprocess communication systems, a specialized forms manager, asynchronous event-driven systems, and user-interface design.

Over 10 years of system programming and system administration experience, ranging from writing backup procedures to debugging in-house device drivers and everything in between. Wrote network security enhancement code, privileged utilities to assist in project management, in-house "helpers" to support desired functions not supported by the target kernel and specialized diagnostics to assist when hardware service people were unable to reproduce faults.

Technical Skills:

Areas of Expertise:	Operating Systems environments, both user- and kernel- mode, real-time environment, embedded systems, device drivers, system administration.
Tools:	gdb and other debuggers, Docker, github, git, git LFS, SVN, and CVS revision control, Make and Eclipse build environments, GNU tools.
Languages:	GNU toolchain, C, C++, Shell scripts, multiple scripting languages (Perl, Python, Lua)
Environment:	Linux (Ubuntu, CentOS, RHEL, SuSE, OpenEmbedded on Intel and ARM processors), Unix flavors (Irix, Dynix (Sequent), Solaris, FreeBSD, HP/UX and Ultrix), VxWorks, Windows
Project Management:	From conceptual stage through to customer delivery and acceptance, primarily using Agile development methodology, Certified Scrum Master

Professional Experience:

Wasson ECE, Ft. Collins, CO

2023-2024

All work was done as a full time employee on Wasson's line of gas chromatographs. These instruments were divided into three classes of microprocessors: A Windows system which ran the GUI, an embedded ARM based system running Linux to collect data and control tiny embedded systems, and those embedded systetms running on PIC-like bare hardware.

• Fixed an error in the vendor-supplied kernel which caused enumerrated GPIO lines go not be available
• Fixed a problem with the RS-422 driver causing lost data in the multidrop bus to all the tiny standalone processprs
• demonstrated that the RS-485 half-duplex bus was working as designed and implemented diagnoses to find the bug in the system
• wrote a series of scripts meant to automate system installation on bare hardware, with an emphasis on readability

Actalent, Broomfield, CO

(contract) 9/2022-11/2022

All work was performed as a contract employee for Pro1, Inc. for the development of a new line of wired and wireless smart thermostats for upscale homes and small commercial venues. These thermostats communicated using a proprietary spread spectrum system and could perform operations based on time of day, room occupancy, scheduled or one-time events, or just as a basic thermostat.

Actalent, Ft. Collins, CO

(contract) 5/2022-8/2022

Actalent, Westminster, CO

(contract) 10/2021-3/2022

Senior Embedded Engineeer
All work was performed as a contract employee for Medtronic Corporation for the development of a surgical tool which consists of an embedded Linux system communicating with a handheld wand running an embedded RTOS. I worked on adding interrupts to support communication with the user, the battery system, and a system interrupt used to create a system clock on the wand.

Tekberry Consulting, Loveland, CO

(contract) 2/2021-6/2921

Senior Embedded Engineer
All work was performed as a contract employee for Keysight Corporation for the development of the P700 instrument, which runs an embedded Linux system on an Arm core. I was tasked with setting up the framework for automated tests on that minimal system.

Game Seven Staffing, TX

(contract) 7/2020-1/2021

Senior Software Engineer
All work was performed as a contract employee for AT&T Corporation for the ongoing development of AT&T TV which runs on an embedded Android system and gets its content over the internet. I worked as part of a national team to launch the new hardware platforms AT&T was deploying the product on and to continue debugging of existing features.

Triple Crown Consulting, Greenwood Village, CO

(contract) 10/2017-8/2019

Senior Software Engineer
All work was performed as a contract employee for ConMed Electrosurgery for the development of a new modular electrosurgery suite of instruments code named Pioneer. Pioneer runs on a minimal, embedded Android system (Linux kernel) using an NXP IMX.6 processor, with one of the cores running SafeRTOS in an Asynchronous Multiprocessing (AMP) configuration. The purpose of the SafeRTOS system is to check and concur with any operation commanded by the Android application before any high energy is allowed to interact with a patient. The Pioneer board was based on the NXP SabreSD board. Android application software was written in C# and Java; Linux code was written in C++ and C.

• Stripped down the Android system to avoid having dead code on the embedded Android device without interfering with Android functionality.
• Specced out another vendor's prototype board with a running example of Android/Linux communicating with FreeRTOS using the virtio, rproc, and remoteproc drivers
• Assisted in the modification of the Device Tree files (.dts/.dtsi) to support the Pioneer board based on our original prototype board
• Built portable build system using Docker to allow system rebuilds regarless of the engineer's specific host environment

Gogo Business Aviation, Broomfield, CO	2/2013-1/2017
formerly Aircell, a GOGO Company

Engineer IV
Designed, developed and implemented software on the UCS 5000, a universal communications system providing WiFi, telephone, and in-flight entertainment for business aviation jets seamlessly over a variety of satellite and ground-based data services. All kernel and system support code was written in C; all application code was written in C++, bash, Perl, Python, and Javascript.

• Designed and implemented the system software update subsystem
• Designed and implemented the in-flight entertainment subsystem that intertied with the separate entertainment application
• Contributed to the design and implementation of the System Manager, a subsystem used to detect the data and voice bearers installed with the UCS; wrote the PPPoE detection subsystem
• Contributed to the design, implementation, and debugging of much of the UCS system, ranging from its network management to its recovery under fault conditions

Designed and implemented part of the build system for the UCS "Jaguar" platform, soon to be released as GogoBiz 4G. The FAA requirements for this system include "byte-for-byte" reproducibility, which required designing methods for building the application software -- in C, C++, Python, Java and Javascript -- along with the CentOS 7 base system as modified, running in a Docker container, as "byte for byte" reproducible.

TEKSystems, Denver, CO

(contract) 7/2012-2/2013

Senior Software Engineer
All work was performed as a contract engineer to Aircell, a GOGO Company for the development of the UCS 5000, a universal communications system providing WiFi, telephone, and in-flight entertainment for business aviation jets. This contract led to a full time position at Aircell.

SGI, Longmont, CO

9/2011-7/2012

Kernel Software Engineer
Worked on three different product lines that provided MAID (Massive Arrays of Idle Disks) storage via iSCSI to a variety of different SANs. This included a legacy product from COPAN, the COPAN 400, to expanded, redundant versions of the COPAN system, to a newly designed MAID system. Work was primarily written in C.

• Provided support for the existing COPAN 400 product line. The COPAN products were written as kernel modules for FreeBSD.
• Developed new code for the failover versions of the above systems
• Prototyped the embedded environment for "Galena," a new MAID product to be written as userland code on Linux.
• Evaluated the pros and cons of using BitBake for the development environment vs. Kiwi, a SuSE-based embedded system builder

Addeco, Denver, CO

(contract) 5/2011-9/2011

Senior Software Engineer
All work was performed as a contract engineer to General Electric for the development of a water purification system running Linux in an embedded environment. All kernel and system support code was written in C; all application code was written in C++.

• Debugged a device driver used for a virtual serial port to another board in the system.
• Wrote code for the application that presents the user interface of the instrument on a touch panel using embedded Qt.
• Deployed numerous applications not designed for cross-compilation using x86 Linux as the development platform for the ARM7 target. For example, Apache and PHP were ported from scratch to the ARM7.
• Customized the Linux kernel to suit it to our ARM target.

AeroTek, Loveland, CO

(contract) 1/2010-12/2010

Embedded Software Engineer
All work was performed as a contract engineer to Brooks Automation for the development of a mass spectrometer using Linux on a TI OMAP-L137 platform. All application code was written in C++, much of it using Eclipse; all kernel code was written in C.

• Wrote and debugged device drivers for getting input from the GPIO lines provided by the OMAP processor as well as outputs to an LCD and backlight system.
• Architected a system data store using XML as well as some fundamental user interface subsystems.
• Fixed extensive memory leaks in the existing code
• Provided classes for diagnostic logging, power-on self test and error handling of both fatal and non-fatal errors
• Architected a supervisory monitor process that handles any unexpected errors in the field and keeps the application available (if degraded in functionality) and safe for the end user

Hewlett-Packard, Boulder, CO	2007-2009
Formerly Lefthand Networks

Senior Software Engineer
All tasks described were for enhancement and troubleshooting of the SanIQ backend, Lefthand's iSCSI storage system.

• Heavily extended the in-house initiator used by testing programs to test and verify standards-compliant behavior of SanIQ
• Wrote a tool to easily interpret error log files from multiple network storage modules (NSMs) as well as initiators for Linux and Windows
• Worked on numerous bug fixes and tests for SanIQ
• Worked to build test systems for use by team members for sorting out difficult tests when non-standards-compliant behavior was detected.

Education:

• Master of Science, Computer Science, University of Colorado, Boulder.
• Bachelor of Arts, Computer Science and Mathematics, Hiram College, Hiram, Ohio.