Senior Administrative Assistant, (US)

CellCentric; Burlington (MA); On-site; USD 70,000 - 95,000; Full time

Job summary

CellCentric is seeking a Senior Administrative Assistant to provide high-quality support to senior leaders and oversee day-to-day administration of our Burlington, MA office. This role demands discretion, organization, and the ability to anticipate needs in a fast-growing biotech environment.

You will manage complex calendars, travel, meetings, and events, coordinate with HR, IT, and facilities, and contribute to cost-efficient office operations while upholding our core values of Trust, Respect,

Qualifications

• 5+ years of administrative or executive support experience, preferably supporting senior leaders.
• Ability to manage multiple priorities in a fast-moving environment.
• Proficient with Microsoft Outlook, Word, PowerPoint, Excel, Teams.
• Excellent written and verbal communication skills.
• Experience in biotechnology or fast-paced professional settings preferred.
• Ability to work independently and as part of a team.

Responsibilities

• Provide proactive administrative support to senior leaders, including calendar management and travel.
• Own day-to-day administration of the Burlington office and support US employees.
• Coordinate internal and external meetings, rooms, AV, catering, and logistics.
• Support meetings and events, including venue and travel coordination.
• Serve as a resource for employees, directing questions to appropriate resources.
• Partner with HR on onboarding and offboarding for US employees.
• Coordinate visitors, deliveries, building access, and reception needs.
• Liaise with building management, IT, facilities, and vendors to maintain office.
• Manage supplies and inventory; optimize costs.
• Create, edit, and format presentations, documents, and reports.
• Handle confidential information discreetly.
• Anticipate needs and take initiative with minimal direction.
• Provide additional administrative and project support across the US organization.

Skills

Administrative support

Calendar management

Travel coordination

Microsoft Office

Communication skills

Confidential information handling

Independent problem solving

Team collaboration

Tools

Microsoft Outlook

Word

PowerPoint

Excel

Teams

Job description

The Senior Administrative Assistant provides high-quality administrative and operational support to CellCentric’s organization, including a variety of senior leaders, while taking primary responsibility for the day-to-day administration of our Burlington, Massachusetts office. This highly visible role requires excellent judgment, organization, flexibility, and the ability to anticipate needs in a fast-paced, growing biotechnology company. This individual will contribute to the success of the team and organization while upholding our core working behaviors of Trust and Respect, Communication and Feedback, Accountability and Reliability, Objectivity, and Team Balance and Enablement.

Key Responsibilities

• Provide proactive administrative support to a variety of senior leaders, including complex calendar management, meeting coordination, travel arrangements, expense reporting, and other administrative needs.
• Own the day-to-day administration and smooth operation of the Burlington office, ensuring U.S. employees have the resources, supplies, equipment, and workplace support they need.
• Coordinate internal and external meetings, including scheduling, meeting rooms, technology and AV requirements, catering, materials, and logistics.
• Support company meetings, leadership meetings, employee events, and other U.S.-based activities, including venue, hotel, restaurant, and travel coordination as needed.
• Serve as a key administrative resource for U.S. employees, helping address day-to-day office and operational needs and directing questions to the appropriate internal resources.
• Partner with HR to support onboarding and offboarding of U.S. employees, including workplace preparation, first-day logistics, and related coordination.
• Coordinate visitors, deliveries, building access, reception needs, and other Burlington office logistics.
• Liaise with building management, facilities providers, IT support, and other vendors to ensure the office and equipment are well maintained.
• Manage office supplies and inventory, coordinate with vendors, and identify opportunities to improve efficiency and manage costs.
• Create, edit, proofread, and format presentations, documents, reports, correspondence, and other business materials.
• Handle confidential and sensitive information with appropriate discretion and professionalism.
• Anticipate administrative and operational needs, identify issues, and take initiative to resolve them with minimal direction.
• Provide additional administrative and project support across the U.S. organization as business needs evolve.

Skills and Qualifications

• 5+ years of administrative, executive support, office management, or related experience; experience supporting senior leaders strongly preferred.
• Demonstrated ability to manage multiple priorities, calendars, deadlines, and stakeholders in a fast-moving environment.
• Strong proficiency with Microsoft Outlook, Word, PowerPoint, Excel, Teams, and other standard business applications.
• Excellent written and verbal communication skills and the ability to interact professionally with employees, executives, Board members, visitors, vendors, and external partners.
• Strong attention to detail, follow-through, and organizational skills.
• Sound judgment and demonstrated ability to handle confidential or sensitive information.
• Proactive, resourceful, and comfortable working independently and solving problems without waiting for direction.
• Flexible and willing to shift priorities as the needs of a growing organization change.
• Experience in biotechnology, pharmaceutical, life sciences, or another fast-paced professional environment is preferred.
• Ability to work both independently and collaboratively within a team.

Working Behaviors (Core Expectations)

• Trust and Respect: Act with integrity, honesty, and openness to build strong, credible relationships.
• Communication and Feedback: Share information clearly, listen actively, and engage in a culture of constructive feedback.
• Accountability and Reliability: Take ownership for performance, be dependable, and support others to achieve collective goals.
• Objectivity: Align on common objectives and use facts and data to reach fair, effective decisions.
• Team Balance and Enablement: Contribute to balanced roles within the team, support delegation, and help colleagues reach their full potential.

Why Join Us?

At CellCentric, we believe success is built on great teams. By embodying these working behaviors, every member contributes to a high-performing, supportive, and inclusive culture where individuals and the business thrive together.