Senior Diagnostic Software Engineer

PACCAR is seeking a Senior Diagnostic Engineer to lead the development of guided diagnostic procedures and vehicle diagnostic software for heavy-duty commercial vehicle electronics. This role supports product launch, drives continuous improvement, and collaborates across engineering, manufacturing, service, validation, IT, and suppliers to deliver reliable, user-focused diagnostic tools.   Location: Kirkland, WA   About PACCAR     PACCAR, Inc. is a Fortune 500 company established in 1905 and is recognized as a global leader in the commercial vehicle, financial, and customer service fields. PACCAR is a global technology leader in the design, manufacture, and customer support of high-quality light-, medium- and heavy-duty trucks under its internationally recognized brands Kenworth, Peterbilt and DAF nameplates. PACCAR designs and manufactures advanced diesel engines and provides customized financial services, information technology and truck parts related to its principal business.    About Global PACCAR Electronics    The Global PACCAR Electronics organization supports Kenworth, Peterbilt, and DAF by transforming how control systems and vehicle software are developed for commercial vehicle applications. GPE designs next‑generation vehicle controls, display systems, and autonomous technologies that raise the bar for customer productivity and safety.  Whether on highways, construction sites, urban centers, or forest roads, PACCAR trucks are recognized for exceptional quality and performance. PACCAR Electronics is central to these product identities—delivering innovations from advanced PTO functionality to intuitive, high‑value digital displays. Join us as we grow and deliver PACCAR’s future in connectivity, cybersecurity, electrification, and autonomous systems.

Design, document, and implement diagnostic algorithms, software, interfaces, and toolset solutions. Provide architectural direction for diagnostic systems and toolset capabilities, ensuring scalability, maintainability, and alignment with business and technical needs. Develop guided diagnostic procedures using a visual logic development environment and Agile methods. Own and evolve diagnostic toolset requirements, standards, and implementation approaches in collaboration with global stakeholders. Support manufacturing launch activities and cross-functional rollout efforts. Lead or contribute to major projects and complex technical problem solving. Create and review engineering specifications, requirements, architecture definitions, and technical documentation. Mentor others, support training needs, and contribute to technical roadmaps. Work with global teams to address worldwide requirements and local content. Collaborate closely with globally distributed teams, including Toolset EU, the Diagnostics team NA, and Vehicle Software Delivery ITD NA, to ensure alignment, effective coordination, and successful delivery of diagnostic solutions.

Qualifications & Skills

Bachelor's degree in Electrical Engineering, Computer Science, Mechanical Engineering, or a related field 8+ years of experience with development and/or testing of onboard diagnostic software for semi trucks  Experience with CAN, SAE J1939, LIN, and object-oriented programming languages such as Python, Java, C++, C#, JavaScript/TypeScript, Ruby, or Swift. Strong problem-solving, communication, and documentation skills. Experience with data analysis, engineering tools, simulation, and test environments. Ability to work in a fast-paced, results-oriented environment. Willingness to travel up to 5% domestically or internationally. Leadership experience mentoring others and running larger projects preferred. Experience with Agile Scrum, continuous improvement, Lean, or Six Sigma methods preferred. Active participation in professional organizations such as SAE, ASME, or IEEE preferred. Experience creating simplified