Senior Design Engineer, Battery Systems

CelLink Corporation • San Carlos, CA

10d • $140,000 - $160,000

About The Position

We’re looking for a practical, hands-on Senior Design Engineer to help develop flexible interconnects and battery connection systems for electric vehicles and energy storage. You’ll work and own your designs from early concept through production with a focus on making products that actually work, scale, and survive in the field.

Requirements

• Bachelor’s degree in Mechanical Engineering, Electrical Engineering, or a related field.
• Minimum 5 years of experience working with electrical systems in industries such as aerospace, robotics, data centers, medical devices, appliances, or similar.
• Strong understanding of Li-ion battery cell formats (pouch, prismatic, cylindrical), including behavior, integration challenges, and design tradeoffs.
• Experience in battery pack design, including series-parallel configurations, voltage/current balancing, and energy density optimization.
• Proficient in mechanical CAD tools such as SolidWorks, NX, or equivalent.
• Familiar with cell connection manufacturing techniques such as laser welding, ultrasonic welding, and resistance welding.
• Knowledge of electrical joint design, mechanical fastening, and insulation strategies specific to battery systems.
• Understanding of End-of-Line testing requirements (HiPot, continuity, resistance, weld integrity) and ability to communicate them clearly in drawings and tooling documentation for low-volume/prototype builds.
• Comfortable working with material properties for conductors, insulators, adhesives, and coatings.
• Strong hands-on prototyping, testing, and troubleshooting skills.

Nice To Haves

• Experience with flex circuit manufacturing and related materials/processes is a plus.
• Familiarity with automotive or energy storage validation protocols and reliability testing is preferred.

Responsibilities

• Design and build the core components that move power and data through the battery pack, including interconnects, current collector assemblies, busbars, voltage sense harnesses, and flexible circuits.
• Develop battery modules and pack layouts with a focus on manufacturability, serviceability, cooling, and system-level integration, making sure everything fits and functions inside the vehicle or enclosure.
• Create and manage detailed CAD models and engineering drawings for interconnects and PCBAs, using GD&T and stack-up analysis to define mechanical and assembly requirements.
• Work hands-on through the full development cycle, from early prototyping to pilot builds and into production, troubleshooting designs as they evolve.
• Collaborate closely with cross-functional teams across mechanical, thermal, electrical, and manufacturing engineering.
• Turn system-level requirements into clear design specifications that meet performance, safety, and regulatory standards.
• Size and validate power distribution elements (busbars, flex, cables) using simulation and analytical methods like Joule heating and thermal modeling.
• Select materials and define stack-ups to balance electrical performance, thermal behavior, and mechanical durability.
• Own and support validation activities, including DVP&R plans, DFMEA reviews, and Design for Manufacturability/Assembly (DFM/DFA) analysis.
• Serve as a technical point of contact for customers, managing relationships, facilitating design reviews, and ensuring alignment on requirements, timelines, and deliverables throughout the development process.
• Help lead engineering program management activities, including coordinating with suppliers, managing BOMs, tracking customer milestones, overseeing the design release process, and driving root cause investigations when issues arise.

Benefits

• At CelLink, we believe that each employee should have the opportunity to become a CelLink shareholder through participation in CelLink's discretionary employee stock option plan.
• You'll also receive comprehensive medical and dental coverage and other great benefits.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level