Director / Senior Director of Accounting

About Mainspring

Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.

The core values that ground our work, guide our decisions, and connect us together:

• Pragmatic Optimism
• Excellence without Ego
• Proactive Collaboration

THE OPPORTUNITY

This is a rare opportunity to build and scale an accounting organization at a pivotal stage of growth.

Reporting to the VP of Finance & Corporate Controller, the Director of Accounting will be the senior operational accounting leader responsible for transforming the close process, strengthening accounting operations, enhancing audit readiness, and building the infrastructure required to support a rapidly growing business.

We’re not looking for someone to simply maintain existing processes. We’re looking for a leader who has built scalable accounting operations before and knows how to establish the rigor, accountability, and discipline required in a high-growth environment.

The ideal candidate combines strong operational accounting expertise with a passion for process improvement, automation, and team development.

Key Responsibilities

Own the monthly and quarterly close process, ensuring accuracy, timeliness, and accountability

Oversee general ledger activities, journal entries, accruals, reconciliations, payroll accounting, and related accounting operations

Drive financial statement integrity and support management reporting requirements

Partner closely with FP&A, Legal, HR, Operations, and other stakeholders across the organization

Design and implement a more efficient and scalable close process

Establish close calendars, ownership structures, review procedures, and reconciliation standards

Develop variance and flux analysis frameworks that improve visibility and decision-making

Create repeatable, auditable processes that support long-term growth

Serve as the primary accounting partner to external auditors

Coordinate audit activities and manage audit requests across the organization

Strengthen internal controls, documentation, and accounting policies

Help build a highly disciplined and audit-ready accounting environment

Identify opportunities to leverage automation, AI tools, and technology to improve efficiency and reduce manual work

Partner on ERP optimization and accounting systems enhancements

Champion continuous improvement across accounting processes and workflows

Lead, mentor, and develop a growing accounting organization

Foster a culture of accountability, ownership, and operational excellence

Help recruit and onboard future members of the accounting team as the company continues to scale

Qualifications

12+ years of progressive accounting experience

3+ years in a senior accounting leadership role such as Director of Accounting, Assistant Controller, or Controller

Proven experience improving or transforming accounting and close processes

Strong operational accounting background, including general ledger, reconciliations, accruals, and financial close management

Experience managing external audits and coordinating cross-functional audit activities

Demonstrated success building processes, controls, and scalable accounting infrastructure

Experience leading and developing accounting teams in fast-paced environments

Excellent communication and stakeholder management skills

CPA certification

Public accounting experience, ideally with a Big 4 or leading regional firm

Experience in manufacturing, industrial technology, hardware, energy, cleantech, or other operationally complex industries

Exposure to inventory and cost accounting environments

Experience with NetSuite or similar ERP platforms

Experience implementing automation, workflow, or close management tools

Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don’t meet all posted requirements for a particular role, we’d still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.

In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.