--- title: 'Senior Test Engineer - Battery Systems at Fleetzero' canonical: 'https://feeny.ai/job/senior-test-engineer-battery-systems-fleetzero-houston-vs1ep5wb17ee' type: 'job' last_seen: '2026-09-08' --- # Senior Test Engineer - Battery Systems at Fleetzero - **Company:** Fleetzero - **Location:** Houston, TX - **Compensation:** $125k–$150k - **Employment:** full-time - **Work type:** onsite - **Posted:** 2026-04-30 - **Last confirmed live:** 2026-09-08 - **Apply:** https://jobs.lever.co/fleetzero/b9bd8b55-bf2b-476c-b0a7-bbde3d64a06b ## Job description Reports to: VP of Engineering Fleetzero is electrifying global maritime shipping with marine-grade lithium-iron-phosphate battery systems built for the harshest environments on the planet. Our Leviathan battery platform is in active ABS Product Design Assessment, with hardware on test rigs today and production hardware shipping in the near term. We are hiring a Senior Test Engineer to take full ownership of our battery test program: The rigs, the procedures, the automation, and the evidence packages that turn engineering work into class-approved, vessel-ready hardware. This is a hands-on role for an engineer who is equally comfortable wrenching on a fixture at 6 AM, debugging a CAN trace at noon, and presenting a thermal propagation test report to an ABS surveyor at 4 PM. You will own our hardware-in-the-loop (HIL) infrastructure, our cell/module/system-level test cells, and the requirements-to-evidence traceability that holds the whole program together. You will work shoulder-to-shoulder with our hardware, firmware, and systems teams to design tests early, fail hardware fast, and produce documentation that is self-explanatory to a first-time reader. If you have ever looked at a battery abuse test cell and thought "I could run this better," this is your job. ## How we work We are a small, dense engineering team in Houston. We test early, test often, and break hardware on purpose. We work in person because integration problems live in the gaps between disciplines, and the gaps close faster when you can walk over to the next bench. We document because the next person who reads our work might be a class surveyor, a customer's chief engineer, or a future version of ourselves at 2 AM in a shipyard. Our team includes mariners, fabricators, software engineers, sales people. We respect the trades and the textbooks equally. ## About Fleetzero ## Company Overview - **One-liner**: Fleetzero builds electric and hybrid propulsion systems for large ships, including modular marine battery systems and autonomy platforms, to decarbonize the maritime industry. - **Entity Type**: Private (Series A) - **Headquarters**: Houston, Texas, USA - **Founded**: 2021 - **Founders**: Steven Henderson (CEO) and Mike Carter (COO) ## Core Business - Primary industry: Maritime electrification, energy storage, and autonomous vessel technology. - Target customers: Commercial shipping operators, shipyards, and fleet owners (B2B, enterprise). - Mission or purpose: To decarbonize ocean freight by delivering safe, cost-effective battery-electric and hybrid solutions that eliminate the green premium. ## Products & Services - **[Leviathan Modular Energy Storage System](https://www.fleetzero.com/)**: Scalable marine battery system delivering up to 3.4 MWh in a compact container footprint. Designed for high energy density, safety, and rapid payback (typically <6 years). - **[Battery Barge](https://www.fleetzero.com/)**: A 55 MWh mobile charging platform that can charge multiple vessels simultaneously, expandable for larger operations. - **[Modular Hull Construction](https://www.fleetzero.com/)**: Pioneering modular shipbuilding to lower construction costs and increase output, enabled by electric propulsion. - **[Autonomy Platform](https://www.cbinsights.com/company/fleetzero)**: Integrated vessel navigation, control, and propulsion system for unmanned cargo operations, targeting underserved routes. ## Market Standing - **Valuation/Market Cap**: Not disclosed (private company). - **Key Metric**: Total Funding – $59.73M raised (Series A as of 2026). - **Notable Investors/Partners**: Maersk Growth, Breakthrough Energy, Obvious Ventures, Y Combinator (Winter 2022 batch). - **Growth Signals**: - Selected (2025) to build the world’s longest-range hybrid-electric vessel. - Series A completed in 2026 with prominent climate and maritime investors. - Launched commercial autonomy platform for shipping in 2026. - Team grew to ~40 employees (as of Y Combinator profile, likely larger now). ## Competitive Advantages - **Cost parity**: Leviathan batteries deliver double the power for half the price vs. other marine battery systems, enabling positive ROI within 2–6 years. - **End-to‑end integration**: Fleetzero’s team (US Navy veterans, mariners, engineers) provides white‑glove service from design through commissioning. - **Modularity**: Both energy storage and hull designs are modular, allowing rapid scaling and lower construction costs. - **Safety focus**: The company refuses to deploy any product they wouldn’t sail on themselves, emphasizing safety above all. ## Strategic Focus - Scaling modular battery production and modular hull construction to reduce shipbuilding costs. - Expanding autonomy platform to open new cargo routes and improve access to underserved markets. - Continuing to lower the cost of maritime electrification to make decarbonization economically viable for all vessel sizes. ## Why Work Here - **Mission‑driven**: Join a team tackling one of the hardest climate challenges – decarbonizing global shipping. The work involves high‑voltage systems, cutting‑edge battery technology, and autonomous robotics. - **Expert team**: Work alongside US Navy veterans, seafarers, and seasoned engineers in a hands‑on environment. The culture is described as demanding but rewarding: “The mission is difficult. The hours are long. The work demands skill, discipline, and resolve.” - **Location**: Based in Houston, TX. Likely on‑site due to manufacturing and testing. - **Growth trajectory**: Early employee at a well‑funded startup with major backers (Maersk, Breakthrough Energy) and clear commercial milestones already achieved. - **Notable perks**: Not explicitly listed, but the company emphasizes “white‑glove service with calloused hands” – a blend of high‑engineering and practical maritime experience. ## Sources 1. [fleetzero.com](https://www.fleetzero.com/) 2. [fleetzero.com/about](https://www.fleetzero.com/about-fleetzero) 3. [ycombinator.com/companies/fleetzero](https://www.ycombinator.com/companies/fleetzero) 4. [cbinsights.com/company/fleetzero](https://www.cbinsights.com/company/fleetzero) 5. [jobs.lever.co/fleetzero](https://jobs.lever.co/fleetzero) ## Other roles at Fleetzero - [Senior QA / Manufacturing Engineer](https://feeny.ai/job/senior-qa-manufacturing-engineer-fleetzero-houston-rhh7r4zsn7dk) — Houston, TX - [Senior Mechanical Engineer](https://feeny.ai/job/senior-mechanical-engineer-fleetzero-houston-6dvkg3t1v1h3) — Houston, TX - [Naval Architect - Marine Engineer](https://feeny.ai/job/naval-architect-marine-engineer-fleetzero-houston-yb02sz515wt3) — Houston, TX - [Electrical Engineer - Harness/Wiring/Distribution](https://feeny.ai/job/electrical-engineer-harness-wiring-distribution-fleetzero-houston-zfzs4sydrwmr) — Houston, TX - [Electrical Engineer - Power Systems](https://feeny.ai/job/electrical-engineer-power-systems-fleetzero-houston-s2qy5qfhbyat) — Houston, TX