Littelfuse (NASDAQ: LFUS) is a diversified industrial technology manufacturing company shaping solutions for the safe and efficient transfer of electrical energy. Headquartered in Chicago, Illinois, USA, we serve customers across industrial, transportation, and electronics markets worldwide. With approximately 16,000 employees we design and manufacture innovative technologies that support electrification, energy efficiency, and advanced automation. Our global reach is matched by a culture that empowers innovation and long-term growth. Guided by our principles We Care, We Succeed With Our Customers, and We Own the Outcome, we work collaboratively, think boldly, and deliver solutions that move industries forward. As part of the R&D engineering team located in Cádiz, the Test Engineer will contribute to the verification and validation of products developed by the team, supporting activities from early prototypes through pilot builds. The role requires strong hands-on electronics skills, confidence with test equipment, and a working knowledge of software development or test scripting used to support efficient testing and reporting. This engineer will work closely with Senior Test Engineers and collaborate across electrical, firmware, mechanical, and test disciplines to deliver robust, well-documented validation evidence. About the job: EVT / Development Support: Assist the R&D group during Engineering Verification Testing (EVT) phases and contribute to debugging and issue reproduction on prototypes. DVT / Validation Execution: Perform Design Validation Testing (DVT) for new products at validation stages, ensuring results are captured clearly and repeatably. Test Rigs & Fixtures: Develop and improve test rigs and fixtures used for EVT and DVT in-house testing, including basic electrical/electronic circuitry design where required. Prototype Assembly & Bring-up: Assist R&D engineers with prototype assembly, bring-up support, and practical troubleshooting. Standards-based Testing: Execute testing to international standards and perform both laboratory-type and functional testing. Reporting & Documentation: Generate test reports, maintain strong record keeping, and support the development of test procedures (including writing procedures under engineer guidance when applicable). Lab Equipment Ownership: Support laboratory equipment maintenance and set-up, including items such as environmental chambers, EMC equipment, and instrumentation. General Technical Support: Provide technical support to the R&D department as required, supporting schedule visibility and execution. About You: Diploma or Bachelor’s degree in Electronics / Electrical Engineering (or equivalent relevant education/experience). Relevant hands-on experience in electronics testing/validation Capability in analogue and digital electronics, with the ability to build circuits and debug at component level. Practical experience with test and measurement equipment (e.g., multimeters, oscilloscopes, and related lab instrumentation). Comfort working with test fixtures and small assemblies; good soldering skills (training can be provided as needed). Fluent written and spoken English, with strong report writing and record keeping. Team-oriented mindset and ability to work effectively in a fast-paced engineering environment. Preferred Skills: Test scripting / programming experience (e.g., Python, LabVIEW, or similar) to improve repeatability and efficiency of testing. Experience with EMC testing environments and instrumentation (hands-on or exposure). Experience writing or refining test procedures and structured validation documentation. Exposure to standards-driven validation (the role includes “testing to international standards”). #LI-DB9 At Littelfuse, we support employee growth and development. Guided by our culture principles, our teams work together to deliver value for customers and make a positive impact in the communities where we operate. We are an equal opportunity employer committed to fostering an inclusive workplace where everyone has the opportunity to grow and contribute. We offer competitive compensation and benefits, performance-based incentives, flexible work arrangements, and development opportunities. Our humble roots date back to 1927, where, in the back of a garage on Chicago’s northside, our founder, Edward Sundt, developed a small, fast-acting, protective fuse for use in sensitive test meters. Sundt wanted to call his new company producing these small fuses, “Little Fuse,” but wasn’t allowed to trademark two such common words. So, instead he went with the one-word, misspelled “Littelfuse.” For more than 95 years, Littelfuse has pioneered innovative products that help empower a sustainable, connected, and safer world. With the ever-evolving electrification and electronification of customer applications, our product technologies are closely linked to sustainable applications such as electric vehicles and EV charging infrastructure, renewable energy and energy storage, factory automation, power management and more. Throughout our history, our people have been the foundation of our success — and that remains true today. Now more than ever, our bright and talented people are a strategic advantage for the company. From the production line to the engineering lab, the office or distribution center, Littelfuse people are an important part of a diverse, talented team of the best and brightest in the industry. While Littelfuse has experienced tremendous growth in recent years, we still maintain a small-company, entrepreneurial approach where your efforts will drive our culture, our business, and the overall success of the organization. No matter where you work or what you do, your contributions will make a difference at Littelfuse — everywhere, every day. Littelfuse is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, gender identity, sexual orientation, disability, protected veteran status, and/or any other protected class under federal, state, or local law.