As an Diagnostic Software Developer, you will play a key role in developing guided diagnostic procedures and vehicle diagnostic software for heavy-duty commercial vehicle electronics. You will design, document, and implement diagnostic algorithms, software, and interfaces, while supporting product launches and driving continuous improvement in diagnostic quality and reliability. This is an excellent opportunity for a collaborative, technically skilled engineer to work across engineering, manufacturing, service, validation, IT, and supplier teams to deliver effective, user-focused diagnostic tools.   Location: Lewisville, TX   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.    Job Responsibilities   * Develop guided diagnostic procedures within off-board diagnostics tool for heavy-duty commercial vehicle electronics. * Design, document and implement vehicle diagnostics algorithms, software, and interfaces. * Software development in a visual logic development environment using Agile methodology. * Support product launch at manufacturing facilities. * Contribute to continuous improvement of procedures and practices for high quality and reliable diagnostic systems. * Work with manufacturing, service, product development, information technology, suppliers, and product validation to ensure a seamless rollout of user-relevant, timesaving, effective tools. * Collaborate with internationally distributed teams to address global requirements and local content.   Qualifications & Skills   * Bachelor’s degree in Electrical Engineering, Computer Science, or a related field. * 5+ years of experience with automotive electronic systems, including substantial hands‑on work with on‑ and off‑board diagnostics. * Experience in automotive electronic systems, preferably including extensive on- and off-board diagnostics development. * Experience with automotive or commercial vehicle networks, such as CAN, SAE J1939 and LIN preferred. * Experience with software development using object-oriented programming will be highly valued. - Python, Java, C++, C#, JavaScript/Typescript, Ruby, Swift * Candidates must be able to perform in a fast-paced, results-oriented team environment. * Excellent problem-solving skills and written and verbal communication skills required. * Experience in creating technical documentation, including preparing simplified drawings and diagrams for production and service is highly valued. * Willingness to grow personally and professionally. * Ability to travel domestically or internationally up to 5%   PACCAR Benefits   * 401k with up to a 5% company match * Fully funded pension plan that provides monthly benefits after retirement * Comprehensive PTO – minimum of 10 paid vacation days (additional days are provided with additional seniority/years of service), 12 paid holidays, and sick time * Tuition reimbursement for continued education * Medical, dental, and vision plans for you and your family * Flexible spending account (FSA) and health account (HSA) * Paid short-and-long-term disability programs * Life and accidental death and dismemberment insurance * EAP services include wellness plans, estate planning, financial counseling and more   Additional Job Board Information   PACCAR is an Equal Opportunity Employer/Protected Veteran/Disability. At PACCAR, we value talent and promote growth and development. We carefully consider numerous compensation factors, including your education, training, or experience. Applicants and employees for this position will not be sponsored for work authorization, including, but not limited to H-1B visas, now or in the future. The salary range for the Diagnostic Software Developer is $90,400 - $141,800 annually. Additionally, this role is eligible for a full range of benefit options listed above. This position is also eligible for a holiday gift.