Firmware Engineer – Supplies Authentication Department (August 2021 – present)• Firmware developer responsible for implementing security algorithms for printer host firmware and supply device firmware.Firmware Engineer – Embedded Electronics Department (March 2020 – August 2021)• Implemented enhancements and bug fixes in the color Electrophotography (EP) and Toner Patch Sensor (TPS) subsystems of engine firmware.• Implemented enhancements in the Print Service subsystem of the Raster Image Processor (RIP) firmware.

Principal Software Engineer• Designed and implemented the Identify3D Enforce library Application Programming Interface (API) to provideenforcement of part program licenses on manufacturing devices.• Implemented and maintained the Identify3D Enforce software Command Line Interface (CLI) application forWindows and Linux. This application was used for multiple Proof Of Concept (POC) projects.• Implemented the Identify3D Enforce software plug-in as a Windows Dynamic Link Library (DLL) for theSiemens Sinumerik 840D sl controller by utilizing the Siemens Open Architecture (OA) software libraries.• Implemented x.509 certificate verification algorithm that determined authenticity and validity of publiccryptographic keys.

Firmware Engineer - Platform Security Department (March 2015 – April 2016)• Embedded firmware developer responsible for implementing algorithms for a semi-custom 16 bit security microcontroller. Responsible for maintaining an automated test application that executes on a Windows 7 workstation and Raspberry Pi based test platform.• System Administrator for a firmware development computer network comprised of a Fedora Linux server and several Microsoft Windows 7 and Raspberry Pi clients. Implemented two factor user authentication on the Windows 7 workstations with certificate based smart cards.Engine Firmware Team Lead - Engine Firmware Department (August 2004 – February 2015)• Reviewed requests for new firmware algorithms and provided effort estimates.• Triaged Problem Tracking Reports (PTRs).• Generated firmware releases and release notes.• Provided status reports to management and development teams.• Created and documented the engine firmware development process that included software requirements, state transition design documentation, test plans, and code reviews.Engine Firmware Engineer - Engine Firmware Department (September 1998 – February 2015)• Designed and implemented application and device driver software for a Linux based embedded ARM Symmetric Multiprocessing (SMP) system.• Implemented control algorithms for motors (brush DC, brushless DC, and stepper), fuser, and fans.• Developed engine firmware code architecture using Pthreads and device drivers to migrate from a dedicated Mitsubishi M16C microcontroller to a shared Freescale microprocessor executing an embedded Linux operating system.• Designed and implemented a cooperative Real Time Operating System (RTOS) that supported task creation/deletion, task switching, counting semaphores, mailboxes, task priorities, and task stack maintenance.• Page Manager - designed and implemented a complex state machine responsible for ordering pages, media/image control, and media tracking.

• Implemented embedded real-time firmware for a Motorola 68HC11 (8 bit microcontroller) based system.• Participated in inspections of software requirements, architecture/design, and code.• Performed hardware optimization and debugging.• Logged and corrected software defects found during testing.• Supported customer, factory, and field engineers during beta and production phases.• Built software releases and created release notes as the Software Configuration Manager.• Organized Software Change Control Board (SCCB) and software coordination meetings.• Assigned and tracked logged defects/issues.• Merged software defect corrections into source code.

• Programmed a tutorial program launcher for Microsoft Windows 3.1 in C.• Enhanced a Windows DLL to support multiple text colors and fonts.• Tested and repaired software components during development and language translations.