What if…you could join an organization that creates, resources, and builds life science bioplatform companies that invent breakthrough technologies to transform human health and sustainability?


Flagship Pioneering has conceived of and created companies such as Moderna Therapeutics (NASDAQ: MRNA), Rubius Therapeutics (NASDAQ: RUBY), and Editas Medicines (NASDAQ: EDIT). Since its launch in 2000, Flagship has applied its unique hypothesis-driven innovation process to originate and foster more than 100 scientific ventures. In 2021, Flagship Pioneering was ranked 12th globally on Fortune’s “Change the World” list, an annual ranking of companies that have made a positive social and environmental impact through activities that are part of their core business strategies.


Flagship Pioneering is seeking an experienced and talented accounting professional to join a first-in-category organization. The Senior Accountant will be an instrumental player in the month end close for Flagship’s entities, will be responsible developing and implementing new accounting policies and procedures to scale within the organization, provide business insights to our leaders to measure progress on company performance, and assist with enhancing companywide financial reports, including enhanced analytics, cash flow management and consolidated reporting


Key Responsibilities:

  • Perform and assist with month-end and quarter end close accounting tasks including preparation of journal entries for multiple entities ensuring compliance with US GAAP
  • Conduct monthly and quarterly account reconciliations to ensure accurate reporting and ledger maintenance
  • Review of P&L accounts to resolve classification issues
  • Ensure that reconciliations, supporting schedules and analysis are completed on a timely basis and in accordance with the monthly closing schedule
  • Partner with Controller staff to develop and update annual budget and monthly forecasts
  • Preparation and assistance with month end analytical review of actual versus budget/forecast
  • Provide Ad-Hoc Reporting and Analysis
  • Monitor and review new accounting pronouncements and implement where necessary
  • Assist with specific projects and initiatives unique to a fast-growing biotechnology start-up, such as system implementations and updates and business process improvements



  • Bachelor’s degree in accounting is required
  • CPA and 2-3 years of Big Four public accounting experience is preferred
  • 1-2 years of biotechnology or life science industry experience preferred
  • Substantial experience with GAAP financial reporting
  • Extensive experience with Microsoft Excel and Word
  • Detail-oriented personality
  • Ability to manage multiple projects in a fast-paced environment
  • Experience with Netsuite a plus
  • Must have excellent analytical skills, with very strong attention to detail
  • Ability to work both independently and in a collaborative team setting
  • Flexibility and ability to adapt to changing conditions and different culture
  • Ability to work within and meet all deadlines while executing on multiple deliverables
  • Flexible, personable team-player, comfortable in a fast-paced, small company environment
  • Proven ability to set and meet ambitious deadlines, handle numerous multifaceted financial matters and see projects through to conclusion
  • Strong written and verbal communication skills and demonstrated ability to work collaboratively with both scientists and management
  • Ability to distill complexity and to communicate decisively with sound judgment


Joining Flagship Pioneering will allow you to:

  • Make an impact as part of a Fortune “Change the World” company
  • Be energized by an exciting startup culture
  • Surround yourself with inspirational colleagues and leaders
  • Support innovative breakthroughs in health care and sustainability
  • Expand your horizons with opportunities for professional growth
  • Enjoy unparalleled employee benefits and rewards programs


Flagship Pioneering and our ecosystem companies 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.


Recruitment & Staffing Agencies: Flagship Pioneering and its affiliated Flagship Lab companies (collectively, “FSP”) do not accept unsolicited resumes from any source other than candidates. The submission of unsolicited resumes by recruitment or staffing agencies to FSP or its employees is strictly prohibited unless contacted directly by Flagship Pioneering’s internal Talent Acquisition team. Any resume submitted by an agency in the absence of a signed agreement will automatically become the property of FSP, and FSP will not owe any referral or other fees with respect thereto.

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