---
title: 'Senior Mechanical Engineer at Fleetzero'
canonical: 'https://feeny.ai/job/senior-mechanical-engineer-fleetzero-houston-6dvkg3t1v1h3'
type: 'job'
last_seen: '2026-09-08'
---

# Senior Mechanical Engineer at Fleetzero

- **Company:** Fleetzero
- **Location:** Houston, TX
- **Compensation:** $100k–$150k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-04-29
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.lever.co/fleetzero/b5014acd-0d87-4876-8958-9a31de646bc6

## Job description

Senior Mechanical Engineer Own mechanical R&D for Fleetzero battery modules: From a clean-sheet concept through production-ready design.

## ABOUT THE ROLE

You will be the driving force behind the full mechanical development lifecycle of our battery module products. That means owning designs from initial concept and first-article prototypes, through development testing, design validation, and into high-volume manufacturing. You will work closely with electrical, manufacturing, and systems engineering counterparts to deliver robust, producible hardware on aggressive schedules. This is a hands-on role. You will be building and testing prototypes yourself, running experiments, and iterating quickly. If you are the type of engineer who is equally comfortable at a CAD workstation and a build bench,  this role is for you.

## BONUS POINTS

Experience with battery systems, power electronics enclosures, or thermal management for high-energy-density products Background in marine, defense, automotive, or industrial equipment markets Familiarity with IP-rated enclosure design and sealing strategies Experience with liquid cooling systems design and qualification

## 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 Test Engineer - Battery Systems](https://feeny.ai/job/senior-test-engineer-battery-systems-fleetzero-houston-vs1ep5wb17ee) — Houston, TX
- [Senior QA / Manufacturing Engineer](https://feeny.ai/job/senior-qa-manufacturing-engineer-fleetzero-houston-rhh7r4zsn7dk) — 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
- [Senior Mechanical Engineer](https://feeny.ai/job/senior-mechanical-engineer-anduril-industries-sydney-new-south-wales-ks474e4wgamr) — Sydney New South Wales, Australia
- [Senior Mechanical Engineer](https://feeny.ai/job/senior-mechanical-engineer-cowboy-space-corp-san-carlos-xy1jwqjtj5na) — San Carlos, CA
- [Senior Mechanical Engineer](https://feeny.ai/job/senior-mechanical-engineer-firestorm-san-diego-qw3c7g3xgkjd) — San Diego, CA
- [Senior Mechanical Engineer](https://feeny.ai/job/senior-mechanical-engineer-scout-ai-sunnyvale-be8f8aqbcec4) — Sunnyvale, CA
- [Senior Mechanical Engineer](https://feeny.ai/job/senior-mechanical-engineer-ionq-geneva-2afn4g71p2cd) — Geneva, Switzerland