Senior Human Resources Manager

Flatiron Energy
Remote Boulder/Denver, New York City, or Boston Full-time 🌐 English
FE
Added to JobCollate: March 4, 2026

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This Senior HR Manager role at Flatiron Energy involves building out the HR function from the ground up, reporting directly to the CEO. The position requires end-to-end ownership of employee relations, performance management, and HR operations, offering an exciting opportunity to contribute to a growing company in the renewable energy sector.

Job Description

About Flatiron Energy Flatiron Energy, a Hull Street Energy portfolio company, is developing and building grid scale standalone energy storage assets that integrate renewable energy onto the grid, replace fossil fuel plants, and increase grid reliability. Founded by a team of experienced energy storage experts, Flatiron has a demonstrated track record of developing critical infrastructure needed to achieve our reliability and energy climate goals. The leadership team has deep experience in developing, constructing and operating energy storage assets in wholesale markets. Flatiron Energy is a growing company with a dynamic, fast-paced, challenging, creative, fun, start-up culture. The right candidate will be excited to help build the company from the ground up, recognizing the challenges and opportunities for growth inherent in such a role. The Flatiron team is passionate about fighting climate change while ensuring their projects have an equitable impact on surrounding communities. Flatiron is only looking for candidates who resonate with our mission. Title: Senior HR Manager Reports To: CEO Location: Boulder/Denver, New York City, or Boston preferred, remote also considered Description: The Senior HR Manager will play a key role in building out Flatiron’s human resources function and supporting our employees. enabling the growth of our employees in their careers. Reporting directly to the CEO, you’ll own employee relations matters end-to-end, drive consistency in performance management, hiring workflows, documentation, benefit management, and employee engagement. In this role you will advise leadership on best practices, lead performance management and processes, develop career progression plans, and create new tools and protocols to enhance people operations and effectiveness. Key Responsibilities: Own employee relations matters end-to-end, from candidate hiring to new hire training to employee performance management Organize and run annual and quarterly performance review cycles (communications, manager enablement, and completion tracking) Partner with leadershipPlease mention the word COMPREHENSIVE and tag RODguMTk4Ljk5LjE0Mw== when applying to show you read the job post completely (#RODguMTk4Ljk5LjE0Mw==). This is a beta feature to avoid spam applicants. Companies can search these words to find applicants that read this and see they're human.

Full Description

About Flatiron Energy Flatiron Energy, a Hull Street Energy portfolio company, is developing and building grid scale standalone energy storage assets that integrate renewable energy onto the grid, replace fossil fuel plants, and increase grid reliability. Founded by a team of experienced energy storage experts, Flatiron has a demonstrated track record of developing critical infrastructure needed to achieve our reliability and energy climate goals. The leadership team has deep experience in developing, constructing and operating energy storage assets in wholesale markets. Flatiron Energy is a growing company with a dynamic, fast-paced, challenging, creative, fun, start-up culture. The right candidate will be excited to help build the company from the ground up, recognizing the challenges and opportunities for growth inherent in such a role. The Flatiron team is passionate about fighting climate change while ensuring their projects have an equitable impact on surrounding communities. Flatiron is only looking for candidates who resonate with our mission. Title: Senior HR Manager Reports To: CEO Location: Boulder/Denver, New York City, or Boston preferred, remote also considered Description: The Senior HR Manager will play a key role in building out Flatiron’s human resources function and supporting our employees. enabling the growth of our employees in their careers. Reporting directly to the CEO, you’ll own employee relations matters end-to-end, drive consistency in performance management, hiring workflows, documentation, benefit management, and employee engagement. In this role you will advise leadership on best practices, lead performance management and processes, develop career progression plans, and create new tools and protocols to enhance people operations and effectiveness. Key Responsibilities: Own employee relations matters end-to-end, from candidate hiring to new hire training to employee performance management Organize and run annual and quarterly performance review cycles (communications, manager enablement, and completion tracking) Partner with leadershipPlease mention the word COMPREHENSIVE and tag RODguMTk4Ljk5LjE0Mw== when applying to show you read the job post completely (#RODguMTk4Ljk5LjE0Mw==). This is a beta feature to avoid spam applicants. Companies can search these words to find applicants that read this and see they're human.

Required Skills

manager hr training growth management lead senior operations reliability

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