Job Details

Overview

CelLink is pioneering the next generation of flexible circuit technology powering electric vehicles, battery systems, and clean energy applications. Our ultra-light, high-performance interconnects are redefining how energy moves through complex systems, enabling smarter, more efficient, and more sustainable designs.

We're building our pipeline for future opportunities (2026 and beyond) and looking to connect with talented Product Design Engineers who are passionate about battery systems and interconnect design. If you thrive at the intersection of mechanical design, electrical engineering, and materials science, and want to help shape the future of electrification, we'd love to stay in touch.

About The Role

As a Product Design Engineer on CelLink's Battery Team, you'll design and develop flexible circuit products for advanced energy storage applications, from concept through validation. You'll collaborate closely with cross-functional teams to optimize battery interconnects, current collectors, and voltage sensing harnesses for performance, reliability, and manufacturability.

Key Responsibilities

• Create and manage 3D models and 2D drawings of battery interconnects, current collectors, and sense harnesses.
• Select termination methods for BMS/PCBA connections (e.g., welded, crimped, soldered, ZIF).
• Define and translate system-level requirements into detailed flex circuit product specifications.
• Build and test prototypes; support design validation and launch activities.
• Conduct and lead design reviews, DFMEAs, and DFM analyses to ensure design robustness.
• Develop and execute DVP&R plans to validate product performance and durability.
• Explore new materials, designs, and processes to enhance the thermal, electrical, and mechanical performance of flexible circuits.

Minimum Qualifications

• Bachelor's degree in Materials Science, Mechanical Engineering, Electrical Engineering, Physics, or equivalent.
• Understanding of Li-Ion battery performance and requirements across pouch, prismatic, and cylindrical cells.
• Experience with cell connection manufacturing processes (laser welding, ultrasonic welding, resistance welding, ribbon/wire bonding).
• Knowledge of mechanical, electrical, and thermal properties of conductor and insulation materials.
• Ability to size busbars and conductors using simulations and 1D joule heating calculations.
• Experience designing and validating electrical joints and connection interfaces.
• Familiarity with battery pack architecture (series/parallel design, energy/power balancing, safety considerations).
• Preferred: experience with FEA/CFD simulation tools for mechanical and thermal analysis.

Location

San Carlos, CA

Compensation

$120,000 – $150,000 (final compensation determined by experience and level).

We anticipate multiple openings and will align compensation accordingly.

Join Our Talent Network

CelLink's mission is to accelerate electrification through innovation in interconnect technology. If you're excited about shaping the future of battery and energy systems, we want to hear from you, even if the timing isn't immediate.

Apply now to join our talent network, and we'll reach out when the next wave of opportunities opens!

We believe diversity and inclusion among our teammates are essential to our success. We celebrate diversity and are committed to creating an inclusive environment for all employees while building teams that represent a variety of backgrounds, perspectives, and skills. We are an equal opportunity employer. All employment is decided based on qualifications, merit, and business needs. CelLink participates in the E-Verify program in specific locations as required by law.

CelLink was founded in 2012 and entered volume production in 2018. CelLink provides electrical systems to the world's leading EV manufacturers, traditional automotive OEMs, and tiered suppliers. The company has raised approximately $315M in funding through private investment and multiple grants from the US Department of Energy. CelLink's investors include 3M, Atreides, BMW, BorgWarner, Bosch, D1 Capital, Fidelity, Fontinalis Partners, Ford, Franklin Templeton, Lear, Park West, SK Telecom, Standard Investments, T. Rowe Price, Tinicum, and Whale Rock.