Senior Accountant

Atrium; New York (NY); On-site; USD 110,000 - 150,000; Full time

Benefits offered by this job

Healthcare benefits

401(k) retirement plan

Paid time off

Life insurance

Disability coverage

Employee assistance program

Job summary

Atrium is seeking a Senior Accountant to lead the development of the in-house accounting function in New York, NY. This role transitions from outsourced to scalable internal processes and requires GAAP expertise, accurate financial reporting, and collaboration with the CEO and Finance Lead.

The successful candidate will own the month-end close, design controls, manage high-volume transactions in a marketplace model, and drive continuous improvement in a fast-growing environment.

Qualifications

• 3+ years of accounting experience, preferably in a high-growth or startup environment.
• Strong knowledge of GAAP and month-end close and financial statement preparation.
• Proven ability to design and implement accounting processes and systems from the ground up.
• Experience reconciling large transaction volumes and managing marketplace or payment flow accounting.
• Excellent organizational skills and ability to thrive in a dynamic, fast-paced setting.

Responsibilities

• Build and implement accounting processes and systems to transition from outsourced to in-house operations.
• Own the month-end close process, ensuring timely and accurate financial reporting.
• Prepare GAAP-compliant financial statements and maintain internal controls.
• Reconcile high-volume transactions and manage complex payment flows for a marketplace model.
• Partner with leadership to improve processes and create structure in a lean, fast-paced environment.
• Support audits, compliance requirements, and financial planning initiatives as needed.

Skills

GAAP knowledge

Month-end close

Financial reporting

Internal controls

Analytical skills

Cross-functional collaboration

Education

Bachelor’s degree in Accounting

CPA designation or progress toward CPA

Tools

ERP systems

Accounting software

Job description

Atrium is seeking on behalf of our client a Senior Accountant based in New York, NY.

A background check may be run only after a conditional offer is made, where permitted by law.

Position: Senior Accountant

Location: New York, NY

Employment Type: Full-time

Compensation: 110-150k base + equity

Position Overview

As the Senior Accountant, you will lead the development of the company’s in-house accounting function, transitioning from an outsourced model to a scalable internal process. You will ensure accurate financial reporting, maintain compliance with GAAP, and support operational efficiency in a high-growth environment. This role collaborates closely with the CEO and Finance Lead to establish strong accounting foundations for future growth.

Must be legally authorized to work in the United States.

Responsibilities

• Build and implement accounting processes and systems to transition from outsourced to in-house operations.
• Own the month-end close process, ensuring timely and accurate financial reporting.
• Prepare GAAP-compliant financial statements and maintain internal controls.
• Reconcile high-volume transactions and manage complex payment flows for a marketplace model.
• Partner with leadership to improve processes and create structure in a lean, fast-paced environment.
• Support audits, compliance requirements, and financial planning initiatives as needed.

Required Experience/Skills

• 3+ years of accounting experience, preferably in a high-growth or startup environment.
• Strong knowledge of GAAP and experience with month-end close and financial statement preparation.
• Proven ability to design and implement accounting processes and systems from the ground up.
• Experience reconciling large transaction volumes and managing marketplace or payment flow accounting.
• Excellent organizational skills and ability to thrive in a dynamic, fast-paced setting.

Preferred Experience/Skills

• Prior experience as the first in-house accountant or in a similar build-from-scratch role.
• Familiarity with accounting software and ERP systems implementation.
• Strong analytical skills and ability to identify process improvement opportunities.
• Experience collaborating with executive leadership and cross-functional teams.
• Background in industries with complex transaction structures or compliance requirements.

Education Requirements

• Bachelor’s degree in Accounting, Finance, or a related field.
• CPA designation or progress toward CPA preferred.
• Continuing education in accounting standards and compliance is a plus.
• Advanced Excel skills and familiarity with financial modeling tools.
• Knowledge of internal controls and audit best practices.

Benefits

• If eligible under the ACA, medical, dental and vision benefits and time off in accordance with local paid sick time laws will be offered.
• Additional benefits may include paid holidays, a 401(k)-retirement plan, life insurance, disability coverage, and an employee assistance program, where applicable.
• Other compensation programs may include overtime, shift differentials, bonuses, commissions, or other incentive compensation, where applicable.

Commitment to Diversity

As a woman-owned firm, we value diversity. We are an equal opportunity and affirmative action employer and will consider all applications without regard to race, sex (including gender, pregnancy, sexual orientation and gender identity), age, color, religion or creed, national origin or ancestry, veteran status, disability (physical or mental), genetic information, citizenship or any other characteristic protected by law. We will ensure that individuals with disabilities are provided with reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Candidates who apply for roles through the Atrium website will be added to our candidate pool and may be considered for additional roles of a similar title. Please contact us to request an accommodation.

EOE/M/F/D/V/SO