Mechanical Engineer - Cell Stack

Electroflow is unlocking domestic production of lithium iron phosphate (LFP), the battery material that will power an energy-abundant future. Using our proprietary electrochemical process, we collapse an incumbent 10-step brine-to-LFP supply chain into just three, making us on track to produce the lowest-cost LFP on the planet. After raising a $10 million Seed round backed by Union Square Ventures and Voyager Ventures, and being featured in The Wall Street Journal (twice!) and TechCrunch, we’re scaling fast to build America’s largest fully domestic LFP supply chain!

As a Mechanical Engineer - Cell Stack , you’ll lead the design, build, and deployment of Electroflow’s modular electrochemical stack. The core hardware that drives our lithium extraction technology. You’ll take ownership of stack architecture, sealing systems, and manufacturability, collaborating closely with our electrochemistry, process, and manufacturing teams. This is a hands-on, full-ownership role for a builder who thrives on turning complex mechanical systems into robust, field-ready hardware.

What You’ll Do

• Own the stack. Lead design of our electrochemical cell stack (frames, manifolds, compression systems, and sealing interfaces) from concept through field deployment.
• Drive development. Partner with internal teams and external suppliers to balance performance, manufacturability, cost, and reliability.
• Prototype and test. Design and build prototypes; run flow, pressure, and sealing tests; iterate fast based on data and field feedback.
• Scale and transfer. Work with manufacturing and technical operations to transition from prototype to pilot to production, including DFM / DFMA, tolerance analysis, and documentation.
• Integrate and deploy. Support system integration, installation, and commissioning of containerized or modular field systems.
• Ensure quality and reliability. Set specifications, define test plans, and feed lessons learned from field data back into next-generation designs.

Requirements

We’re looking for a mechanical engineer who’s taken complex fluid or electrochemical hardware from prototype to production. Someone who can own design decisions and ship real systems that work.

You’ll do great here if you have :

Bonus points if you :

You'll fit right in if you :

Benefits