Senior Associate, Legal Billing and Administration

MFS Investments; Boston (MA); On-site; USD 90,000 - 105,000; Full time

Job summary

Bain Capital is seeking a Senior Associate for Legal Billing & Administration to support the firm’s legal billing function across the platform. You will partner with Legal, Finance, and investment teams to ensure timely processing, maintain billing data accuracy, and enhance reporting, technology, and controls supporting the function.

The role requires a Bachelor’s degree and 3–5 years in legal billing or related fields; Onit experience is highly preferred.

Qualifications

• Bachelor’s degree required; degree in accounting, finance, business, or a related field preferred.
• Approximately 3–5 years of relevant experience in legal billing administration, legal operations, accounts payable, accounting, finance, or a related function.
• Experience with legal e-billing and matter management systems; Onit experience strongly preferred.
• Strong proficiency in Microsoft Excel and ability to analyze large datasets; familiarity with enterprise financial systems like Workday.

Responsibilities

• Support and drive Bain Capital’s legal billing strategy to ensure processing and payment of invoices and meaningful analysis of billing data.
• Administer and maintain Onit e-billing and matter management platform; troubleshoot system/workflow issues.
• Coordinate with Legal, Finance, and investment teams to manage matters in Onit, including creation, coding, allocation, and closure.
• Monitor invoices through review, approval, and payment to identify exceptions and delays.

Skills

Excel

Data analysis

Communication

Multitasking

Education

Bachelor’s degree

Tools

Onit

Workday

Job description

# Senior Associate, Legal Billing and AdministrationBain CapitalBoston, MAFull-TimeOct 23, 2026Legal## Job Description**BAIN CAPITAL OVERVIEW**With approximately $225 billion of assets under management, Bain Capital is one of the world’s leading private investment firms. We create lasting impact for our investors, teams, businesses, and the communities in which we live. Over four decades we have strategically grown our platform to focus on Private Equity, Growth & Venture, Capital Solutions, Credit, and Real Assets. Today, our team includes 1,985+ employees in 24 offices on four continents.**We partner differently to help people and companies embrace possibility and realize potential.**Founded as a private partnership in 1984, we have fostered a culture of innovation, entrepreneurialism, and agility, empowering our people to define and own their career trajectories. Today, our partnership approach enables us to pursue strategic growth, build enduring relationships with a robust external network, and collaborate across our integrated platform to connect the deep and diverse expertise that unlocks breakthrough insights.**Our people are the heart of our advantage.**Colleagues at all levels have a seat at the table as they tackle business challenges with a principal investor mindset. By asking incisive questions, respectfully challenging one another, and remaining intellectually agile, we work together to achieve exceptional outcomes.**POSITION OVERVIEW**Bain Capital is seeking a Senior Associate – Legal Billing & Administration to support the firm’s legal billing function across the Bain Capital platform. The role will partner closely with Legal, Finance, and investment teams, Accounts Payable, and outside counsel to ensure the efficient and timely processing of legal invoices, maintain accurate legal billing data, and enhance the reporting, technology, and controls supporting the function.**Key responsibilities include:*** Support and help drive Bain Capital’s legal billing strategy, including initiatives to ensure the efficient and timely processing and payment of legal invoices and enable meaningful analysis of legal billing data across the Bain Capital platform.* Administer and maintain Bain Capital funds’ and advisors’ e-billing and matter management platform, Onit, which serves as the financial system of record for legal matters and facilitates the processing and payment of legal invoices. Support Bain Capital Onit users and work directly with Onit to troubleshoot and resolve system and workflow issues.* Coordinate with Bain Capital Legal, Finance, investment teams, and other stakeholders to manage legal matters in Onit, including new matter creation, matter coding and allocation, ongoing maintenance, payment routing, and matter closure.* Manage a high volume of legal billing activity and proactively monitor invoices throughout the review, approval, and payment process to identify and resolve exceptions, delays, and other issues.* Communicate regularly with outside counsel and other legal vendors to resolve billing issues, facilitate invoice submission, and support vendor onboarding. Partner with the Bain Capital Legal team to maintain and enforce legal billing guidelines, budgets, and other billing requirements.* Partner closely with Accounts Payable and Finance to facilitate timely and accurate payment of legal invoices and resolve payment, coding, allocation, and reconciliation issues.* Build and maintain legal billing reports for Bain Capital Legal, Finance, FP&A, and other stakeholders on both a regular and ad hoc basis, including reporting related to accruals, budgets, legal spend, invoice status, and paid fees.* Provide detailed and accurate analysis of legal billing data across the Bain Capital platform, identifying trends, exceptions, and actionable insights for senior stakeholders.* Help maintain the accuracy and integrity of legal billing and matter data and identify opportunities to strengthen processes and controls across the invoice lifecycle.* Leverage technology, data, and automation to improve legal billing processes, reporting, controls, and workflows. Proactively identify opportunities to reduce manual processes and develop more scalable and efficient solutions.* Serve as a knowledgeable resource on legal billing processes and systems and help drive continuous improvement of the legal billing function.**Qualifications*** Bachelor’s degree required; degree in accounting, finance, business, or a related field preferred.* Approximately 3–5 years of relevant experience in legal billing administration, legal operations, accounts payable, accounting, finance, or a related function. Experience in a law firm or in-house legal billing environment strongly preferred.* Experience with legal e-billing and matter management systems. Onit experience strongly preferred, including familiarity with Counsel Exchange/CounselGo.* Strong proficiency in Microsoft Excel and demonstrated ability to work with and analyze large datasets. Experience with Workday or another enterprise financial system preferred.* Strong technology aptitude and demonstrated interest in using technology, automation, and reporting tools to improve processes and drive efficiencies.* Entrepreneurial and self-directed, with the ability to identify issues, take ownership, and drive matters through resolution with limited oversight.* Exceptionally organized and detail-oriented, with demonstrated ability to manage high-volume, complex workflows and multiple competing priorities.* Excellent interpersonal and teaming skills, with the ability to work effectively across Legal, Finance, Accounts Payable, investment teams, senior management, and third-party law firms and vendors.* Clear, professional, and proactive communicator with strong judgment, accountability, and follow-through.* Ability to develop effective working relationships with senior stakeholders while also managing the detailed day-to-day responsibilities of the legal billing function.* Prior experience working with an alternative asset manager or other financial services organization is preferred but not required.***Compensation:****Expected Annual Base Salary $90,000 - $105,000**Actual base salary will be determined by a wide range of factors including but not limited to role, function, level, experience, qualifications and geographic location. In addition to a competitive base salary, this position may be eligible for a discretionary annual bonus based upon factors such as individual impact, team and firm performance. Bain Capital offers a competitive benefits package designed to support employees’ health, financial security, family needs, and overall well-being.**Bain Capital is an equal opportunity employer. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status.*### About Bain CapitalFounded in 1984, Bain Capital is one of the world’s leading private investment firms. We are committed to creating lasting impact for our investors, teams, businesses, and the communities in which we live. As a private partnership, we lead with conviction and a culture of collaboration, advantages that enable us to innovate investment approaches, unlock opportunities, and create exceptional outcomes. Our global platform invests across five focus areas: Private Equity, Growth & Venture, Capital Solutions, Credit & Capital Markets, and Real Assets. In these focus areas, we bring deep sector expertise and wide-ranging capabilities. We have 24 offices on four continents, more than 1,950 employees, and approximately $215 billion in assets under management.