Signal Integrity Engineer / シグナル インテグリティ エンジニア (横浜)

Your Job Signal Integrity Engineer / シグナル インテグリティ エンジニア

Our Team Our Signal Integrity team in Japan offers the best of both worlds: the energy, ownership, and speed of a startup, backed by the strength, stability, and global reach of a major technology company. We value results, innovation, teamwork, and contribution-motivated people who want to solve meaningful engineering problems.

You will work with global Molex teams and customers across Japan, the U.S., Europe, China, and beyond on advanced products requiring RF, microwave, electromagnetic, and signal integrity expertise. We invest in learning, principled risk-taking, and mutual benefit so that talented engineers can grow, contribute, and thrive.

What You Will Do ・You will design, simulate, optimize, measure, and correlate high‑speed connectors (board‑to‑board, wire‑to‑board, cable, and FPC connectors).

This role combines strong EM fundamentals, 3D EM HFSS simulations, and lab validation to independently complete the full development loop:

model → simulate → measure → correlate → recommend

・You will prepare clear technical reports/presentations for both technical and non‑technical audiences.

Who You Are (Basic Qualifications) ・Strong, practical knowledge of electromagnetics, microwave theory, and transmission line fundamentals, especially for passive structures.

・Deep understanding of SI issues in both time and frequency domains (reflections, resonance, coupling, loss mechanisms).

・Advanced proficiency in ANSYS HFSS, including model setup, simplification, ports, meshing strategy, boundary conditions, convergence, and results interpretation.

・Ability to create accurate models of real hardware and clearly justify modeling assumptions (accuracy vs. complexity vs. runtime).

・Extensive hands‑on experience with VNA, TDR, and high‑speed oscilloscopes.

・Strong ability to correlate simulations to measurements and troubleshoot discrepancies (fixtures, launches, calibration/de‑embedding).

・Comfortable operating in a fast‑paced, multi‑project global environment and eager to learn new tools and concepts.

・Ability to communicate complex results clearly to both expert and non‑expert audiences.

・Demonstrated experience in RF/microwave or signal integrity engineering for passive device design.

・Background in electrical engineering, electronics, or a related field, or equivalent practical experience.

・Intermediate‑level Japanese for local collaboration.

What Will Put You Ahead ・Experience with board‑to‑board, wire‑to‑board, and FPC connectors.

・Awareness of mechanical feasibility, tolerances, constraints, manufacturing trade‑offs, and geometry exchange/cleanup.

・Experience with SI + mechanical and/or thermal co‑simulation for holistic connector design.

・Knowledge of PCIe, Ethernet, USB, and SerDes/channel margin (eye/BER) concepts.

・Use of AI tools to streamline engineering and reporting workflows (e.g., report automation, modeling templates, presentation generation).

・Business‑level English for global communication and customer engagements.

・Business‑level Japanese for local collaboration.

・Python scripting for simulation or measurement automation.

・Understanding of PI fundamentals (PDN impedance, return paths, decap strategy) and exposure to PI tools.

・10+ years of experience in RF/Microwave or SI engineering for passive devices.

・Master’s or PhD focused on electromagnetics or microwave theory, with research emphasis in those areas.

At Koch companies, we are entrepreneurs. This means we openly challenge the status quo, find new ways to create value and get rewarded for our individual contributions. Any compensation range provided for a role is an estimate determined by available market data. The actual amount may be higher or lower than the range provided considering each candidate's knowledge, skills, abilities, and geographic location. If you have questions, please speak to your recruiter about the flexibility and detail of our compensation philosophy. Who We Are At Koch, employees are empowered to do what they do best to make life better. Learn how our business philosophy helps employees unleash their potential while creating value for themselves and the company.

Additionally, everyone has individual work and personal needs. We seek to enable the best work environment that helps you and the business work together to produce superior results.