Senior Medical Writer

Location: Barcelona or Madrid

About CDM Barcelona:

As part of one of the world’s most prestigious healthcare advertising agencies, CDM Barcelona brings people, brands, ideas and innovation together to change real lives in extraordinary ways.

Our core values allow us to work with clients in a way that changes their perception of what an agency can and should be.

We lift each other up, challenge each other, demand from each other and encourage each other because we are responsible for each other. We work tirelessly to protect what we’ve built because it allows us to be who we are: dreamers, builders, pioneers, friends, lifechangers.

We belong to Omnicom Health, the largest healthcare marketing and communications network in the world, with more than a dozen companies and over 4,000 talented people specializing in every area of health. Our people come from every corner of science, medicine, marketing, and communications, partnering with clients—and connecting with each other— to achieve meaningful change through better, more innovative communications.

About the role:

As a Senior Medical Writer, you will take a leading role in developing scientifically rigorous and creatively engaging communication materials that support clients’ medical and promotional strategies. You will act as a trusted expert for both internal teams and clients, providing strategic scientific input, guiding junior writers, and ensuring excellence from concept to delivery.

Key Responsibilities

• Lead the development of scientific content, ensuring alignment with client goals, brand strategy, and industry best practices.


• Provide strategic scientific direction during content planning and campaign execution.


• Conduct and oversee bibliographic research, ensuring all materials are accurate, evidence-based, and compliant.


• Write, edit, and adapt complex scientific materials—including slide decks, monographs, publications, and training documents—maintaining clarity, accuracy, and adherence to guidelines.


• Oversee the preparation and delivery of complete reference sets using Veeva, ensuring quality and compliance.


• Manage client feedback processes, ensuring timely integration and consistency across deliverables.


• Build and maintain relationships with Key Opinion Leaders (KOLs) to support content development and approvals.


• Mentor junior writers, providing feedback, guidance, and support in skill development.


• Represent the medical writing function in client meetings, contributing to strategic discussions and providing scientific expertise.

About you:

• Must have a health science degree (e.g. in biology, pharmacy or medicine). PhD is a plus


• 5 years of experience in medical writing and scientific content supervision in marketing and advertising contexts.


• Ability to communicate medical/technical information to a wide variety of audiences


• Ability to work in a deadline-driven environment


• Attention to detail and absolute reliability in meeting delivery deadlines


• Team player who can foster positive relationships between the department and other agency teams, such as creatives and account managers


• Experience with reference managers such as EndNote is a plus

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