Energy Storage Application Engineer

About FlexGen

Based in Durham, N.C., FlexGen is an innovative software and services provider in the global energy storage sector. At the forefront of the energy transition, FlexGen leverages decades of engineering and software expertise to help shape the future of sustainable power both in the United States and globally. FlexGen's HybridOS™ software seamlessly integrates with any hardware vendor and with both traditional and renewable power sources. Our advanced analytics and AI-driven insights enable energy storage owners to effectively deploy diverse power market strategies and integrate various generation forms, enhancing grid stability and increasing economic returns. With 1.5M hours of runtime and 8 GWh of energy storage systems managed with HybridOS™, FlexGen provides field-tested software and services solutions that are trusted by the most technically and commercially demanding developers, utilities, government agencies, and industrial companies in the world.

FlexGen is seeking an Energy Storage Application Engineer to support the development and delivery of cutting-edge energy storage projects. In this role, you will partner with our Business Development and Technical Support teams to provide pre-sales engineering, system design guidance, and technical expertise for Energy Storage Systems and FlexGen’s Energy Management System (EMS), HybridOS.

You will act as a trusted technical advisor in customer engagements—bridging hardware, software, and market applications—to ensure FlexGen delivers solutions that meet both technical and commercial needs. From project development and opportunity evaluation through contract execution, you will help drive adoption of FlexGen’s industry-leading EMS and BESS solutions.

Key Responsibilities:

Technical & Project Support

• Support preliminary ESS design, system sizing, and power system analysis.
• Provide technical guidance on energy storage solutions during project development and pre-sales phases.
• Collaborate with system engineering and software engineering teams to ensure accurate technical solutions.
• Partner with the Sales and Business Development teams to position HybridOS™ EMS and ESS solutions for new opportunities.
• Partner with Business Operations team to prepare and deliver technical presentations and proposals highlighting EMS and BESS capabilities, system performance, and integration benefits.
• Serve as a subject matter expert in customer meetings, demonstrating the value of FlexGen’s EMS and BESS solutions

Customer & Market Engagement

• Serve as a technical point of contact for customers, supporting system design, interconnection requirements, and market-specific considerations
• Partner with the Business Development team to identify strategic opportunities and provide technical input for proposals
• Contribute to project estimations and cost modeling for ESS projects

Commercial Support

• Assist in contract negotiations by ensuring technical requirements are accurately reflected in agreements
• Provide clear technical documentation and responses to customer inquiries during proposal and contracting stages

Position Requirements:

• Associate degree in Engineering or equivalent relevant experience
• Strong technical aptitude in electrical or power systems engineering
• Excellent listening, communication, and customer engagement skills
• Ability to manage multiple priorities and remain professional under pressure
• High proficiency in Microsoft Excel
• Valid driver’s license and willingness to travel
• Ability to pass background and toxicology screening
• Preferred Qualifications:
• • Bachelor’s degree in Electrical, Mechanical, or Power Systems Engineering
  • Professional certification or license (e.g., EIT, PE, PMP)
  • Experience with AutoCAD, PowerBI, Visual Basic, Microsoft PowerPoint
  • Prior experience in energy storage, renewable energy, or utility-scale power projects
  • Familiarity with grid interconnection requirements and utility/ISO processes
  • Exposure to contract negotiation or technical sales engineering

FlexGen provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability or genetics. In addition to federal law requirements, FlexGen complies with applicable state and local laws governing nondiscrimination in employment in every location in which the company has facilities. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. 

FlexGen expressly prohibits any form of workplace harassment based on race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, genetic information, disability, or veteran status. 

To the extent permitted by law, employees are subject to periodic random drug testing, and post-accident and reasonable suspicion drug and alcohol testing. 

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