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 integral 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 a
Functional Test Engineer (Experience in Debug)
, you will play a critical role in ensuring our products meet all architectural specifications and functional requirements. You will be responsible for creating validation environments, executing complex system-level test plans, and performing deep root-cause analysis on failures across hardware and software domains.



You will work closely with design, architecture, firmware, and software teams to isolate defects, validate fixes, and ensure high-quality products are delivered to market.

About Your Job
- Executes functional validation plans and test suites at system and subsystem levels under a variety of operating conditions.
- Acts as the first line of defense for system failures by isolating, reproducing, and debugging complex functional, performance, and power-related issues.
- Performs deep-dive root cause analysis to determine whether failures originate from hardware, software, firmware, or test environment issues.
- Develops and maintains automation scripts and tools (Python, LabView, etc.) to streamline test execution, data collection, and CI flows.
- Collaborates cross-functionally with Hardware/ASIC Design, Firmware, Architecture, and Software teams to communicate findings, propose workarounds, and

📌 Functional Test Engineer (Piedras Negras)
🏢 Littelfuse
📍 Piedras Negras