Full-Time

Systems Test Engineer

Posted on 8/23/2025

Eos Energy Storage

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

Local travel and less than 10% overnight travel in North America.

Category
QA & Testing (1)
Required Skills
Python
Data Analysis
HTML/CSS
Excel/Numbers/Sheets
Requirements
  • Ability to manage multiple testing projects simultaneously.
  • Exposure and experience with battery test labs and procedures.
  • Knowledge of batteries, inverters and related power electronics equipment.
  • Knowledge of interpretation of electrical results related to cells and batteries.
  • Working knowledge of Microsoft Excel
  • HTML, Python or other programming skills strongly preferred.
  • Experience with low and high-voltage systems and related safety protocols highly desired.
  • Exceptional organizational skills and rigorous attention to detail required.
  • Strong working knowledge of testing rechargeable cells, batteries and systems.
  • Bachelor's degree in science/engineering field required.
  • Minimum of 2 years' experience.
Responsibilities
  • Implement System Test plans across all Edison-based System Test platforms
  • Coordinate testing resources. Communicate backlog issues, if not preventable.
  • Validate hardware and software operation across all Edison-based System Test platforms
  • Analyze data and troubleshoot operations
  • Scale laboratory module testing parameters to System Test Platforms
  • Prepare formal system performance and operation reports
  • Develop System testing protocols, formal Work Instructions and testing templates.
  • Run complex testing programs
  • Write formal test scripts and reports to perform company required testing
  • Provide an open line of communication with experiment owners and stakeholders for follow up data analysis and testing.
  • Monitor data output and records to ensure highest level of integrity and value
  • Maintain active coordination with other departments to generate data and provide results as needed.
Desired Qualifications
  • HTML, Python or other programming skills strongly preferred.
  • Experience with low and high-voltage systems and related safety protocols highly desired.

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

Simplify Jobs

Simplify's Take

What believers are saying

  • $701.5M backlog and $23.6B pipeline drive revenue to $300-400M in 2026.
  • Second production line starts late Q2 2026, expanding to 8GWh annually.
  • Driehaus invests $110M in Q4 2025, signaling institutional confidence.

What critics are saying

  • Securities lawsuits over 2025 revenue miss settle by mid-2028, draining cash.
  • Second line delays from automation issues miss Q4 2026 capacity targets.
  • Lithium-ion cost drops from CATL erode zinc advantages by 2027.

What makes Eos Energy Storage unique

  • Znyth zinc batteries enable 3-12 hour discharges unlike lithium-ion.
  • Z3 modules retain over 97% capacity across 6,000 cycles.
  • DawnOS provides AI-enabled predictive analytics for grid flexibility.

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Benefits

Health Insurance

Paid Vacation

Flexible Work Hours

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

2%

2 year growth

-1%
Yahoo Finance
Apr 10th, 2026
Eos Energy stock climbs 30% as Q1 revenues forecast to expand 433%

Eos Energy Enterprises climbed 29.63% to $5.95 on Thursday after announcing first-quarter 2026 revenues of $56 million to $57 million, representing a 433% to 443% increase from $10.5 million in the same period last year. The battery energy storage company attributed the growth to record shipments and strong manufacturing performance. The company cited operational improvements in supplier quality control, lean processes and equipment optimisation as drivers of increased throughput and execution. Shipments remained aligned with customer contractual commitments. Eos Energy also completed factory acceptance testing for its second production line during the quarter, with initial production targeted for late second quarter. The new line incorporates efficiency enhancements including single-piece flow configuration and advanced gantry systems. Official results are due next month.

Yahoo Finance
Mar 13th, 2026
Battery storage firm Eos Energy draws $110M investment despite 47% stock decline

Driehaus Capital Management purchased 7.70 million shares of Eos Energy Enterprises in the fourth quarter, worth an estimated $110.72 million based on quarterly average pricing, according to a February 17, 2026 SEC filing. The investment increased Driehaus' total stake to 14.27 million shares. Eos Energy, which manufactures grid-scale battery storage systems, has seen shares rise nearly 50% over the past year to $6.12, outperforming the S&P 500's 19% gain. Revenue reached $114.2 million in 2025, more than seven times the prior year, driven by increased deliveries and manufacturing improvements. The company reported a $701.5 million backlog and $23.6 billion commercial pipeline. However, shares have tumbled 47% since last quarter following softer-than-expected revenue guidance, partially reversing recent gains.

PR Newswire
Mar 10th, 2026
Eos Energy sued for fraud after manufacturing issues cause 39% stock drop

Eos Energy Enterprises faces a securities fraud class action lawsuit after its stock fell 39% on 26 February 2026. The lawsuit, filed in the US District Court for the District of New Jersey, alleges the company misrepresented near-term revenue growth and manufacturing capabilities. Eos Energy, which manufactures zinc-based battery energy storage systems, had guided fiscal year 2025 revenue of $150 million to $160 million whilst touting manufacturing progress. However, the company reported a $970 million net loss and missed guidance due to production inefficiencies, battery line downtime and quality delays. The complaint alleges violations of the Securities Exchange Act. Investors have until 5 May 2026 to apply to lead the case. Law firm Bleichmar Fonti & Auld is representing plaintiffs on a contingency basis.

PR Newswire
Mar 9th, 2026
Law firm investigates Eos Energy after $114.2M revenue misses $150M–160M guidance

A securities class action lawsuit has been filed against Eos Energy Enterprises, Inc. (NASDAQ: EOSE) on behalf of investors who purchased securities between 5 November 2025 and 26 February 2026. Law firm Robbins LLP is investigating allegations that the battery manufacturer misled investors about its business prospects. The complaint alleges Eos Energy failed to disclose production difficulties, including battery line downtime exceeding industry norms and delays in automated bipolar production quality targets. On 26 February 2026, the company reported full-year 2025 revenue of $114.2 million, significantly below its guidance of $150 million to $160 million, alongside a net loss of $969.6 million. Following the announcement, Eos Energy's share price fell 39.4% to $6.74. Shareholders may participate in the class action through Robbins LLP.

Yahoo Finance
Mar 6th, 2026
Stifel cuts Eos Energy price target to $12 from $22, maintains buy rating after Q4 miss

Stifel has lowered its price target on Eos Energy Enterprises (NASDAQ: EOSE) to $12 from $22 whilst maintaining a Buy rating. Separately, Guggenheim downgraded the stock to Neutral from Buy, removing its $20 price target, citing management's struggles with financial forecasting despite operational progress. The adjustments followed Eos Energy's Q4 results on 26th February, which missed expectations. The company reported earnings per share of negative 84 cents versus consensus estimates of negative 24 cents, and revenue of $58 million against the $93.69 million estimate. CEO Joe Mastrangelo described 2025 as "a structural turning point", noting expanded capacity to 2 gigawatt-hours, record quarterly revenue, and over $240 million in Q4 bookings. The company ended the year with a cash position above $600 million.

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