Flagship Pioneering is a scientific innovation engine that invents and builds companies that change the world. We bring together the greatest scientific minds with entrepreneurial company builders and assemble the capital to allow them to take courageous leaps in human health, sustainability, and beyond. What sets Flagship apart is our ability to advance biotechnology by uniting life science innovation, company creation, and capital investment under one roof in a way that is largely without precedent.

Our team of scientists, entrepreneurial leaders, and professional capital managers are each aligned around an institutionalized process that enables us to innovate and create breakthroughs for the benefit of people and planet. Many of the companies Flagship has founded have addressed humanity’s most urgent challenges: vaccinating billions of people against COVID-19, curing intractable diseases, improving human health, preempting illness, and feeding the world by improving the resiliency and sustainability of agriculture. Flagship has been recognized twice 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, and has been named four times to Fast Company’s annual list of the World’s Most Innovative Companies.

Position Overview Reporting into the Vice President, HR, the S enior D irector , Human Resources Business Partner (HRBP) for the Lab Companies will be a key driver of the people strategy for the lab companies within Flagship. In this role, the Sr. Director, HRBP will build and sustain relationships with their client group and the broader enterprise.

The Senior Director, HR Business Partner will collaborate with HR leaders across the organization to diagnose needs, develop thoughtful solutions, and drive meaningful impact across our LabCo portfolio. This person brings strong business acumen and a proven ability to connect people strategy to business outcomes, navigating complexity and change with confidence and clarity. The ideal candidate is an experienced coach and trusted advisor who can influence decision-making, foster accountability, and guide leaders and employees through the full range of people challenges that come with building companies at speed.

They are equally skilled at stepping back to see the big picture and rolling up their sleeves to get things done, understanding that at Flagship, both are required in equal measure. This role demands a demonstrated track record of building credible partnerships with senior leaders and their teams, as well as the interpersonal range to connect authentically with employees at every level of the organization. The Senior Director will bring proven leadership experience, a sharp eye for organizational design, and the ability to build and develop high performing HR teams.

Above all, this is someone who earns trust quickly, communicates with candor, and knows how to meet people where they are to move the business forward.

Responsibilities

: Serve as the senior HR leader across Flagship's LabCo portfolio, partnering with companies from ProtoCo through NewCo (up to Series B) while directly managing a hands-on business partner remit of 2–3 companies Lead and develop a team of HR Managers/Junior HR Business Partners, providing day-to-day guidance, coaching, and serving as the escalation point across their respective early-stage company remits Drive operational and strategic HR delivery across core business partner disciplines including performance management, employee relations, manager effectiveness, and engagement and culture initiatives Partner closely with Talent Acquisition to support workforce planning and hiring, ensuring org builds are thoughtfully designed and aligned to each company's stage, strategy, and growth trajectory Own organizational design and business alignment work, advising leadership teams on structure, role clarity, and peo