Senior BESS Engineer – Battery Technology & Sizing

Hydrogen Group is seeking a Senior BESS Engineer – Battery Technology & Sizing for a 12-month contract opportunity in Juno Beach, FL.

This is an exciting opportunity for an experienced energy storage engineer to take a key technical role supporting utility-scale Battery Energy Storage System (BESS) projects. The position combines BESS sizing and system optimization with battery technology evaluation and the development of innovative engineering tools and processes.

The role

As a Senior BESS Engineer, you will serve as a technical specialist in utility-scale battery energy storage, supporting project-specific sizing decisions while evaluating existing and emerging storage technologies.

You will apply strong engineering fundamentals to optimize BESS solutions against technical, operational and commercial requirements while helping improve the tools and methodologies used throughout the engineering lifecycle.

Key responsibilities include:

• Provide technical expertise for utility-scale BESS sizing, methodology, assumptions and optimization

• Develop and optimize end-to-end BESS sizing from the point of interconnection through substations, transformers, PCS/inverters, DC systems and batteries

• Account for system losses, battery degradation, augmentation and overbuild strategies, temperature effects and operating constraints

• Incorporate project-specific technical and contractual requirements into sizing calculations

• Develop, maintain and continuously improve BESS sizing methodologies, calculators and technical guidance

• Maintain accurate records of sizing assumptions, inputs, technical decisions and results

• Review project-specific sizing results and identify optimization opportunities and technical risks

• Maintain BESS and PCS equipment data used within engineering sizing tools

• Evaluate existing and emerging battery and energy storage technologies

• Assess battery performance characteristics including degradation, efficiency, available energy, reliability, state of charge and state of health

• Evaluate emerging and alternative energy storage technologies for technical maturity, performance, safety, scalability and commercial viability

• Develop preliminary system sizing and cost estimates to support technology evaluations

• Analyze technical data and communicate findings and recommendations to engineering and project stakeholders

• Develop and improve tools to automate BESS sizing, performance forecasting, technical evaluations and repetitive engineering workflows

• Apply data analytics, programming, automation and AI-enabled approaches where they can improve engineering quality, consistency and efficiency

• Collaborate with technical and software teams to translate engineering methodologies into scalable digital tools

What we're looking for

• Bachelor's or Master's degree in Electrical Engineering, Mechanical Engineering, Chemical Engineering, Materials Engineering or a related discipline

• Strong utility-scale BESS engineering experience

• Demonstrated knowledge of BESS sizing and system optimization

• Understanding of AC and DC sizing methodologies

• Knowledge of battery degradation, system losses, augmentation/overbuild strategies and thermal impacts

• Understanding of PCS/inverters and associated power electronics

• Experience assessing battery performance and energy storage technologies

• Strong analytical and problem-solving capabilities

• Ability to translate complex engineering requirements into practical technical solutions

• Strong written and verbal communication skills

• Ability to work effectively across multidisciplinary engineering and project teams

• Strong organizational and technical documentation skills

Desirable experience

• Alternative or emerging battery chemistries and long-duration energy storage technologies

• Flow batteries, sodium-ion batteries, multi-day storage, supercapacitors or other alternative storage technologies

• IGBT or SiC inverter technology

• Battery and/or PCS technology evaluation

• Engineering automation and digital tool development

• Python, Excel/VBA, Power BI or similar analytical tools

• Applying AI or advanced data analytics to engineering applications

• Battery performance forecasting

• Experience engaging with battery or PCS manufacturers and technology providers

Some travel to manufacturing facilities may be required to support technology assessments.

Contract details

Location: Juno Beach, FL – Hybrid
Contract: 12 months
Pay rate: Up to $52.96 per hour

If you're an experienced BESS Engineer with strong battery energy storage sizing, optimization and technology expertise, we'd like to hear from you.

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