Full-Time
Senior Reliability Engineer
Reliability
Updated on 9/3/2026
Eos Energy Storage
201-500 employees
Manufactures aqueous zinc battery energy storage
No salary listed
Company Does Not Provide H1B Sponsorship
Edison, NJ, USA
In Person
Bachelor's
 Mechanical Engineering (1) |
|---|
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- A Bachelor's degree in Electrical Engineering is required.
- At least 8 years of experience in systems engineering, reliability engineering, or a related field is required.
- Experience with electronic component reliability, SR-332 modeling, and annual failure DPPM and AFR estimation is required.
- Proficiency with reliability modeling tools such as Relyence, RelCalc, or similar tools is required.
- A strong understanding of environmental stress testing, including thermal cycling, humidity, and Highly Accelerated Life Testing, is required.
- Familiarity with degradation mechanisms in electronic components and printed circuit board assemblies is required.
- Experience conducting root cause analysis and developing corrective actions for wear-out failures is required.
- Lead reliability objectives for battery storage hardware, including printed circuit board assemblies and electromechanical assemblies.
- Develop long-term reliability test plans for all battery management system circuit boards, including thermal cycling, damp heat, and other environmental stresses aligned with warranty requirements.
- Estimate annual failure DPPM and AFR percentages using SR-332 standards and reliability modeling tools.
- Assess expected field-use conditions, including power-on hours, temperature exposure, and duty cycle.
- Identify components with potential wear-out mechanisms and develop degradation or failure-rate models as needed.
- Determine acceleration factors and test durations based on agreed-upon field-use assumptions.
- Detect wear-out failure modes during testing, coordinate root cause investigations, and recommend corrective or preventive actions.
- Create Highly Accelerated Life Test plans to uncover early-life and latent failure mechanisms and assess their relevance to field conditions.
- Develop Highly Accelerated Stress Screening plans to evaluate ongoing production product quality.
- Participate in recurring reliability reviews with engineering teams to track progress, risks, and timelines.
- Provide guidance on system-level and software-related reliability considerations, including interactions between hardware, firmware, and operational conditions.
- Support broader reliability initiatives within the battery storage platform as needed.
Eos Energy Storage develops and manufactures aqueous zinc battery energy storage systems for commercial, industrial, utility, and renewable energy customers. The systems store electrical energy in an aqueous zinc chemistry and are designed for 3 to 12 hours of use to support grid resiliency, peak shaving, demand management, and intermittent renewable generation. The products are modular battery packs with simplified components aimed at reducing production costs and risks while delivering reliable storage for microgrids and large-scale projects. Compared with typical lithium-ion approaches, Eos focuses on a different chemistry and a streamlined design to provide cost-effective, safe energy storage for grid applications. The company’s goal is to accelerate the transition to clean energy by enabling reliable, affordable storage that boosts grid reliability and supports renewable integration.
Company Size
201-500
Company Stage
IPO
Headquarters
Edison, New Jersey
Founded
2008
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Simplify's Take
What believers are saying
- Q2 2026 revenue hit $68.8 million, up 351%, while shipments rose 207%.
- Pipeline reached $24.6 billion, with 32% data-center demand and 51% eight-hour-plus projects.
- Frontier Power's financing targets over $1.5 billion in deployment capital from Eos technology.
What critics are saying
- Eos cut 2026 revenue guidance to $300 million-$350 million because Thorn Hill downtime bites.
- July 2026 rights financing sold only 6.9 million of 27.4 million units, worsening dilution.
- With $1.76 billion liabilities, Eos faces refinancing pressure if margins stall in 2027.
What makes Eos Energy Storage unique
- Nonflammable aqueous zinc batteries avoid lithium-ion thermal runaway and use 91% domestic content.
- Thorn Hill consolidates production into automated U.S. manufacturing for repeatable, lower-cost output.
- Golden Dome selected Eos for defense power, validating grid and security credentials.
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Benefits
Health Insurance
Paid Vacation
Flexible Work Hours
Growth & Insights and Company News
6 month growth
↓ -2%1 year growth
↓ -3%2 year growth
↓ -3%Bloom Energy and Eos Energy Enterprises both serve the growing energy infrastructure sector, but target different markets. Bloom provides onsite power through solid oxide fuel cell technology for data centres and utilities, whilst Eos offers zinc-based long-duration energy storage for renewable energy grids. Bloom reported revenue exceeding $2 billion in fiscal 2025, representing approximately 37% growth, though it posted a net loss of roughly $88.4 million. The company maintains partnerships including a $5 billion financing framework with Brookfield. Eos achieved revenue of approximately $114.2 million in 2025, a 630% increase year-over-year, but reported a significantly wider net loss of nearly $1.75 billion as it ramped up commercial manufacturing. Both companies face distinct risks. Bloom contends with pending securities litigation and supply chain dependencies linked to China. Eos confronts ongoing losses, reliance on external capital, and competition from larger battery manufacturers. For 2026, Bloom expects revenue to leap 85% to $3.75 billion, driven by AI data centre demand. Eos projects revenue to more than double, with management citing a $25 billion business pipeline.
Eos Energy Enterprises reported a Q2 2026 net loss of $276 million, primarily from non-cash fair value adjustments of warrants and derivatives. The company tightened its 2026 revenue guidance to $300 million to $350 million due to manufacturing downtime during facility consolidation. Management is accelerating the consolidation of production into its Thorn Hill facility, which is expected to reduce conversion costs by 10% to 15% with a nine-month payback period. The company achieved record cube shipments and a 20% sequential output increase at its Turtle Creek facility whilst maintaining flat labour costs. Eos expects a 72-point improvement in adjusted gross margin over the next 12 months through material cost reductions and manufacturing efficiencies. The company anticipates closing the second year tranche of its advanced request loan by the end of Q3.
Eos Energy Enterprises reported record revenue of $68.8 million in Q2 2026, up 351% year-over-year and 21% sequentially. Cube deliveries increased 207% year-over-year. The company achieved its seventh consecutive quarter of gross margin improvement, with adjusted gross margin improving 132 points year-over-year. It ended the quarter with $364 million in total cash and nearly 100% free cash flow conversion from operations. The company's fleet has cumulatively discharged 6.5 gigawatt hours of energy. Its pipeline grew to $24.6 billion (nearly 112 GWh), up 31% year-over-year, with 51% being eight hours or longer and 32% data centre related. Eos narrowed its 2026 revenue guidance to $300 million to $350 million as it consolidates manufacturing operations. Despite revenue growth, the company reported a gross loss of $48.8 million and adjusted EBITDA loss of $71.4 million.
Eos Energy Enterprises completed a $37.7 million composite units offering on 21 July 2026, followed by a $19.9 million shelf registration for common stock. Since the capital raises, the company's share price has declined sharply, with a 39.1% drop over 30 days and 73.94% year-to-date fall. The stock now trades at $3.38, below analyst fair value estimates. One narrative values the shares at $3.20, suggesting 5.6% overvaluation, whilst a discounted cash flow model estimates fair value at $4.52, implying 25.3% undervaluation. Investors face significant risks including the company's $939 million in liabilities against only $114 million in revenue, high customer concentration, and complex debt structure. The investment depends on zinc-based battery technology commercialisation and continued policy support.
Eos Energy Enterprises raised approximately $263 million for Frontier Power USA, combining a $37.7 million rights offering with institutional investments from Hudson Bay Capital Management and Cerberus Capital Management. The financing aims to support over $1 billion in deployable project capital for long-duration energy storage using the company's zinc battery systems. Shareholders subscribed for only 6.9 million of 27.4 million units offered, representing roughly 25% participation. Eos shares fell approximately 5.5% to $3.76 on 23 July, about 31% below the $5.481 rights offering price. The company reported preliminary second-quarter revenue between $68 million and $69 million, more than tripling from the prior year. However, gross margins remained negative at 69% to 73%, reflecting start-up expenses and low initial production volumes. The financing creates significant dilution, with approximately 20.6 million new shares issued immediately and warrants potentially adding another 39 million shares. Cerberus will control four of seven Frontier Power USA board seats.