Senior Performance Engineer in Chelmsford

Ready to Make a Real Impact? Join e-STORAGE!

Who We Are

Welcome to e-STORAGE, a proud member of the Canadian Solar Inc. (NASDAQ: CSIQ) family! We’re leading the way in designing, building, and integrating advanced battery energy storage systems for utility-scale projects. Our mission? To accelerate the world’s renewable energy transition and create a more sustainable, resilient energy future for everyone.

Role Overview for Senior Performance Engineer

In this role, you’ll bring together the sharp analytical mindset of a controls engineer and the hands‑on problem‑solving instincts of a commissioning engineer to efficiently troubleshoot complex issues and pinpoint root causes on operating systems. You’ll take ownership of diagnosing performance challenges and work closely with internal teams and external vendors to drive solutions, validating and evaluating firmware and software updates to ensure system security and reliability, minimising downtime. Your insights will feed back to internal teams and product improvements to drive a cycle of continuous improvement.

What You’ll Be Doing as a Senior Performance Controls Engineer

• Prioritise, investigate, and drive the corrective action for performance issues identified during facility operation.
• Troubleshooting and root cause analysis using data analysis, first principles, on site investigation, or other means as needed.
• Validate software/firmware updates in coordination with vendors, the site service team, and relevant stakeholders to confirm documented changes and no unintended consequences are introduced. Coordinate subsequent rollouts with the appropriate site service teams.
• Effectively communicate issues to the appropriate vendor and stakeholders to ensure resolutions are identified and implemented.
• Support performance testing as required under individual contracts for each facility.
• Contribute to fleet wide efforts for improving the efficacy of monitoring and analysis processes and tools.
• Collaborate with internal teams to provide input to improve performance across the business from applications and design to project execution and commissioning to service.
• Provide documentation of issues and resolutions for tracking, knowledge sharing, and internal and external communications.
• Ensure all activities are performed in compliance with safety protocols, engineering standards, and company policies.

What You’ll Bring to the Position

• Demonstrated experience in customer-focused problem solving.
• Ability to execute projects and tasks in parallel, self-directed, highly detail-oriented, organised and flexible.
• Experience troubleshooting using data analytics.
• Experience in commissioning, performance testing, maintenance, and/or design of BESS or other power generating facilities.
• Knowledge and experience with SCADA protocols (i.e. DNP3 and Modbus).
• Familiarity with industrial communication networks (fiber optics, network switches, TCP/IP, etc.).
• Excellent communication skills.
• Ability to travel up to 20% of time. Travel may be on short notice.
• Demonstrated experience in problem solving.

What It’s Like to Work Here

At e-STORAGE, you’re more than just an employee—you’re part of a team that values your ideas, your background, and your unique perspective. We believe that a culture of equity, diversity, and inclusion isn’t just the right thing to do—it’s the secret to our success. Here, you’ll find:

• Integrity: We do what’s right, always.
• Innovation: We encourage fresh thinking and bold ideas.
• Quality: We take pride in delivering excellence, every time.
• Customer Focus: We listen, we care, and we deliver.
• Sustainability: We’re passionate about protecting our planet for future generations.

Why You’ll Love Working With Us

• Join a global leader in renewable energy, backed by over 23 years of Canadian Solar experience.
• Work on projects that matter—helping to build a cleaner, greener world.
• Thrive in a supportive, collaborative environment where your growth is our priority.
• Enjoy a competitive salary and a generous benefits package.

Your Rewards

We offer a competitive salary, performance bonuses, and a comprehensive benefits package—including health coverage, retirement plans, paid time off, and more.

Our Commitment to Equality & Diversity

“At e-STORAGE, we know that diverse teams drive innovation and better results. We’re committed to creating a workplace where everyone feels respected, valued, and empowered—regardless of age, race, gender, ability, or background. When you join us, you’re joining a community that celebrates your uniqueness and supports your success.”