BESS Engineer

Job Summary:

• The Utility Scale Energy Storage team is looking for an innovative and dynamic engineer to serve as the Battery Technology & Sizing Lead in a key Sr. Engineering role. The successful candidate will support the team as a Subject Matter Expert (SME) in evaluating existing and emerging energy storage technologies, including battery technologies, PCS/power electronics, and alternative energy storage solutions.


• The role will focus on assessing technology performance, technical maturity, commercial readiness, cost, and applicability to utility-scale projects and new use cases, while also providing strong technical expertise in BESS sizing and system optimization.


• The successful candidate will lead BESS sizing methodologies, manage system losses and project-specific assumptions, and ensure optimized solutions aligned with power purchase agreements and other project requirements.


• The candidate will also be expected to continuously improve BESS sizing tools and engineering processes. Experience applying AI, automation, data analytics, or software tools to engineering applications is preferred, along with an open and innovative mindset toward adopting emerging technologies to improve engineering quality, efficiency, and decision-making.

Key Responsibilities:

BESS Sizing & Optimization SME

• Support the lead Subject Matter Expert (SME) for utility-scale BESS sizing, providing technical leadership on sizing methodology, assumptions, optimization, and project-specific sizing decisions.


• Develop and optimize end-to-end BESS sizing from the point of interconnection through GSU/substation, PCS/inverters, DC system, and battery, accounting for system losses, degradation, augmentation/overbuild strategies, temperature, operating constraints, and contractual requirements.


• Own and continuously improve BESS sizing methodologies, calculators, assumptions, and technical guidance to ensure consistent and accurate sizing across projects.


• Organize and maintain a clear tracking record of sizing assumptions, inputs, decisions, and results from early-stage development through project execution.


• Review project-specific sizing results, identify optimization opportunities and technical risks, and provide sizing recommendations to Engineering, Development, Supply Chain, and project teams.


• Fully own and maintain the sizing tools to ensure the latest and greatest BESS and PCS equipment ratings are incorporated in the sizing database.

2. Technology Evaluation

• Support the lead SME in the team to assess and evaluate new and existing battery technologies and their applicability to utility-scale systems.


• Conduct thorough technical evaluations and performance assessments such as degradation, efficiency, available energy, and overall reliability, SOC/SOH, encompassing battery cells, modules and system. And utilization of Claude, VS Code, Devon Desktop, etc. to build tools for performance prediction.


• Evaluate non-lithium-ion and emerging energy storage technologies for new and evolving use cases, regional market demand, assessing technical maturity, performance, safety, scalability, supply chain readiness, and commercial viability.


• Develop preliminary system sizing and CAPEX estimates for alternative energy storage technologies to support technology selection, business-case development, and pilot or commercial deployment decisions.


• Utilize the annual technology RFP and RFI database from major and emerging energy storage technology vendors to track and visualize technology advancements, product roadmaps, performance, and commercial readiness, and provide a concise summary of key findings and recommendations to management.

3. Digital Tools, Automation & AI

• Develop and improve engineering tools that automate BESS sizing, technical evaluations, battery performance forecast, and repetitive engineering workflows.


• Utilization of AI, automation, data analytics, or software-based tools to improve engineering productivity and decision-making is preferred.


• Experience developing engineering tools using Excel/VBA, Python, Power BI, low-code platforms, AI tools, or similar technologies is preferred.


• Demonstrated curiosity and willingness to adopt emerging technologies, including AI, and identify practical applications that improve engineering quality, speed, consistency, and knowledge


• sharing in a dynamic environment.


• Partner with software development and other technical teams to translate engineering methodologies into scalable digital tools and automated workflows.

Preferred Qualifications

• Bachelor's or master's degree in electrical engineering, Mechanical Engineering, Chemical Engineering, Materials Engineering, or a related field.


• Demonstrated expertise in utility-scale BESS sizing and optimization, including AC/DC sizing, degradation, system losses, augmentation/overbuild, thermal impacts, and project-specific operating requirements.


• Experience with alternative chemistry technologies, such as flow battery, multi-day storage system, fuel-cell-like technologies, sodium ion battery, supercapacitor. Background in IGBT and SiC inverters is a plus.


• Established experience in the energy storage industry with a strong professional network and demonstrated relationships with major and emerging battery and/or PCS vendors.


• Experience applying AI, automation, programming, or advanced data-analysis tools to engineering problems is strongly preferred.


• Ability to combine strong engineering fundamentals with an innovative mindset and willingness to challenge and improve existing engineering processes.


• Excellent document and folder organizational skills for easy access and retrieval and data base tracking.


• Excellent project management, communication, and leadership abilities.


• Willingness to travel to battery manufacturing sites for technology assessment.

Dexian stands at the forefront of Talent + Technology solutions with a presence spanning more than 70 locations worldwide and a team exceeding 10,000 professionals. As one of the largest technology and professional staffing companies and one of the largest minority-owned staffing companies in the United States, Dexian combines over 30 years of industry expertise with cutting-edge technologies to deliver comprehensive global services and support.

Dexian connects the right talent and the right technology with the right organizations to deliver trajectory-changing results that help everyone achieve their ambitions and goals. To learn more, please visit .

Dexian is an Equal Opportunity Employer that recruits and hires qualified candidates without regard to race, religion, sex, sexual orientation, gender identity, age, national origin, ancestry, citizenship, disability, or veteran status.