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.
We are looking for an experienced Senior Electronics Engineer to lead the design, development, testing, and support of advanced electronic systems from concept through to production. Based in Cádiz, Spain, you will be part of the R&D development team, working on electronic protection and safety products, with a strong focus on Residual Current Devices (RCDs), ground-fault detection devices, and related protective functions used in low-voltage electrical systems. This role offers the opportunity to contribute across the full product lifecycle—from concept and design through prototyping, validation, certification, and production support—while collaborating with multidisciplinary engineering teams.
Design, develop, modify, and evaluate electronic systems and subsystems for protection and safety products
Define design approaches, architectures, and key parameters to meet performance and compliance requirements
Create detailed schematics, perform circuit analysis, and run simulations to validate designs
Apply strong expertise in both analog and mixed-signal circuit design
Lead and/or oversee PCB design activities, including signal integrity, power distribution, and thermal considerations
Evaluate and select electronic components based on performance, reliability, availability, and cost
Plan and execute prototype testing, analyze results, troubleshoot issues, and iterate designs
Ensure designs meet performance, reliability, and safety standards
Work closely with firmware, mechanical, and test engineers to ensure seamless system integration
Develop and maintain technical documentation, including design specifications, test plans, and reports
Ensure compliance with applicable standards and certification requirements (IEC, CE, UL, etc.)
Bachelor’s degree (or higher) in Electrical Engineering, Electronics Engineering, Telecommunications, or a related field
Minimum 7 years of experience in electronics design and development
Strong foundation in analog and digital electronics
Proficiency with schematic capture and PCB layout tools (Altium preferred)
Experience with mixed-signal design
Strong communication skills in English, with experience working in international environments
Experience with RCD technologies (Type A, Type B)
Exposure to Arc Fault Detection (AFD / AFDD) technologies
Experience in embedded hardware design and collaboration with firmware teams
Familiarity with simulation tools and analysis applications
Knowledge of Python or other scripting languages for testing or data analysis
Understanding of certification and compliance processes (CE marking, IEC, UL, etc.)
Experience in pure analog circuit design and testing
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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.