Office Manager / Bookkeeper (Part-Time)Boston, MA or Chicago, ILPart-time, 24-27 hours per week - hybrid, with two in-office days Non-exempt / HourlyThe OpportunityTire One Partners is seeking a proactive and detail-oriented Office Manager/Bookkeeper to support our Boston, Chicago, and New York offices on a part-time basis (24-27 hours per week). This person can be based in either our Boston or Chicago office. You'll play a key operational role at a nationally recognized, award-winning integrated marketing agency – partnering closely with senior leadership, to keep the business running smoothly and help shape a positive culture across Tier One's Boston, Chicago, and New York offices.This is a hands-on, agency support role combining bookkeeping and finance administration, light HR support, and office management. Key ResponsibilitiesBookkeeping & PayrollAR, AP, and reconciliations (bank and credit card accounts) in QuickBooks OnlinePayroll entry, deductions, and review with Alcott HR/iSolved (PEO firm) Process 401(k) contributions, including journal entries, and manage relationships with the 401(k) provider and third-party administrator Support monthly and year-end reporting in partnership with our external accounting firm Monthly client invoicing; contract management and organization; track client billable expenses; follow up with clients on overdue receivablesManage employee credit cards and reimbursements; bill pay through Ramp.comPrepare financial reports as requested (payroll, expenses, AR, AP)Maintain a strong understanding of Tier One's expenses and proactively identify opportunities to cut costsMaintain a strong understanding of employee utilization and forecast vs. actual hours; report and monitor for the Senior Leadership Team HR AdministrationProvide light HR administrative support with Alcott HR, including maintaining the Employee Handbook, tracking and updating pay changes, and collecting/e-filing employee paperworkManage the employee on- and off-boarding process Follow and manage the Operations Calendar for important dates and deadlinesOffice Management/TechnologyMaintain administrative recordkeeping and e-filing (using Google Drive folders and sites)Coordinate with Tier One's managed IT provider, Miles IT, on employee onboarding and offboarding; manage agency's laptop inventoryMaintain a strong understanding of Tier One's technology partners (e.g., Cumulus Global, Miles IT) and the services they offer, including securityTake a proactive approach to managing riskIdentify opportunities to increase Tier One's use of AI to streamline finance and operations What We're Looking ForFinancial Savvy: Solid financial management experience – someone capable of coordinating accounts payable/receivable, invoicing, and reporting while keeping senior leadership informedSystems Champion: Highly organized, detail-oriented, and comfortable managing multiple deadlines Trusted Guardian: Absolute integrity; deeply trustworthy and discreet when handling sensitive payroll, HR documentation, and confidential financial informationSolution Seeker: A proactive problem-solver who takes initiative to optimize processes, manage vendor relationships (such as IT and payroll), and identify cost-saving opportunitiesTech-Forward Operator: Curious about modern digital tools and AI applications, with an active interest in finding new ways to automate and streamline finance and operationsCollaborative Connector: A natural relationship-builder who fosters a positive agency culture across offices, facilitating smooth communication between employees, senior leadership, and external partners.Qualifications2+ years of bookkeeping, accounting, or office management experience; agency or professional services experience a plusProficiency with QuickBooks Online required; experience with Ramp, payroll/HRIS platforms (e.g., iSolved), and Google Workspace preferredExperience with payroll processing, 401(k) administration, and basic HR administrative functionsYour Pay and BenefitsThe expected salary for this role is $40,000-48,000 annually, and may vary based on experience and qualifications. In addition to base salary, Tier One offers a competitive benefits package, including:401(k) with a 3% Safe Harbor contribution Paid time offHybrid work flexibility; we offer flexible scheduling options to accommodate various personal commitments and caregiving responsibilities. Opportunities for professional development and career growth. How You Will SucceedTimely, accurate bookkeeping, reconciliations, payroll, and invoicing with minimal errorsOn-time monthly and year-end financial reportingSmooth, well-documented onboarding/offboarding and HR administrative processesProactive identification of risks, cost savings, and process/automation improvementsWho We AreTier One Partners is an independent, integrated marketing agency with more than two decades of experience helping high-growth companies lead through disruption. We specialize in PR, content, and digital marketing for organizations operating in complex, high-stakes industries including technology, financial services, digital health, and energy tech.We are proud to be recognized by PRovoke Media as:One of the 100 Best Agencies in the USA Top 40 Technology Agency globallyA 20 Best US Agencies to Work For