Dan Rolfe Email & Phone Number

Salt Lake City, Ut, Us

● Created a suite of applications used to flash, configure, and test an in house designed and assembled hardware device in an automated fashion. Each device configuration is stored in CouchDB for reference, or to be used by the configuration application to reset device settings. Automated tests were written in C++ using GoogleTest covering all functions of the device to allow confidence the device was assembled and configured correctly.● Conducted X-ray imager characterization and A/B testing when a sudden FPGA End-Of-Life caused immediate need to replace an FPGA in many existing products with no drop-in FPGA replacement available. Clarified existing product behavior so new designs could mimic behavior as closely as possible, minimizing the impact of change to customers. Isolated differences between new and old designs, collaborating with many internal teams to correct deviations.● Designed an API to control custom hardware. Reworked the API after collecting and consolidating feedback from multiple device users. The API included a minimal set of commands needed to meet the intended use while documenting how to use the device.● Volunteered to fill a needed DevOps role left open due to gaps in personnel. Added 4+ build VMs and 15+ test systems of varying configuration (Linux, Windows, Jetson) to an existing Jenkins build environment. Guided two other departments in creating automated build and test environments, replacing existing manual and semi-automated testing. Identified and summarized the most common downtime causing failures. Planned and executed a transition from individual test systems to a server-based system with VMs. The Updated approach provided redundancy for the most common failures reducing average monthly system failures more than 50%, lowered time to add a new test node from days to hours while optimizing limited available physical space. Published training on DevOps procedures while coaching DevOps new hires.

Salt Lake City, Ut, Us

● Key member of a team involved with deciding how to split resources and IP between Varian Medical Systems and Varex. Compiled a list of software, systems, and IP to be transferred to Varex ownership and provided rationale for these decisions. Coordinated efforts to update Varex applications and processes to minimize the impact of losing Varian resources for the Varex production floor. ● Performed a code and infrastructure update to a collection of legacy web applications. Updated the PHP framework from CodeIgniter 2.x to 3.1.x and the PHP version from 5.3.x to PHP 7.x. Updated the entire codebase for compatibility with the new versions of CodeIgniter and PHP. Configured LAMP servers with production, development and QA environments to run the updated web applications. This project allowed the replacement of aging systems that were becoming increasingly difficult and time-consuming to maintain. This update also allowed developers to use new PHP features, like type hinting, to build more robust code. The server updates also allowed another developer to add in SPC analysis using a software package that was unavailable to the existing servers.● Created an automated test suite for the existing web applications. This automated verification project tested the requirements of existing web applications. The automated test suite used a combination of C#, NUnit, and Selenium. This project eliminated tedious, and error prone manual testing performed for each release, while also providing regression tests for the existing requirements. Once completed, the automated test suite reduced time required for code release to production from multiple months down to two weeks.● Taught a coworker how to use Entity Framework with a MySQL backend. Provided support and direction enabling a junior developer to replace a MSSQL database with MySQL for an existing application. This allowed an existing application to remain in use after a MSSQL resource was no longer available.

Palo Alto, Ca, Us

● Completed a suite of applications to simplify flat panel imager acceptance test procedure generation, automate test script generation, and define customer specification limits for each flat panel imager configuration using CodeIgniter, CSS, and jQuery. This project consolidated three separate procedures while adding the ability to track change history.● Designed and implemented a web-based application to grade and store flat panel imager test data utilizing CodeIgniter, CSS, and jQuery. This application used customer specifications defined within another tool to display a web form for the purpose of collecting test data on flat panel imager devices. Values collected during production testing were compared against customer specifications for customer acceptance. This application removed the need for an engineer to manually create database entries, create custom PHP/HTML files, and maintain the multi-thousand-line JavaScript file as needed by the system it replaced.● Integrated software purchased from a vendor with existing in-house applications. Worked with the vendor software team to design and implement interfaces for sharing data back and forth. The interface design utilized an HTTP interface with an XML schema implemented in the in-house software, and a set of MSSQL stored procedures from the vendor.

Master’S Degree, Computer Engineering

Bachelor'S Degree, Computer Engineering

Bachelor'S Degree, Computer Science