RA Capital

About Us:

Diagonal Therapeutics is a clinical-stage biotechnology company pioneering a new class of medicines. While nearly every antibody drug works by blocking an overactive signal, Diagonal does the opposite — our clustering antibodies bridge two receptors at the cell surface to turn normal signaling back on, reaching diseases the blocking model cannot. Our lead program, DIAG723, is the first clustering antibody in the clinic, designed to address the root cause of both hereditary hemorrhagic telangiectasia (HHT) and pulmonary arterial hypertension (PAH). Behind it, our platform pairs computational and experimental discovery to build a pipeline across cardiovascular, renal, and other diseases.

For more information, please visit www.diagonaltx.com

Position Summary:

The Senior Administrative Assistant provides high-level administrative support to the executive management team, including C-Suite leadership. As Diagonal scales and builds out its infrastructure, this role is central to keeping a lean, fast-moving leadership team operating seamlessly — managing complex calendars, coordinating board and investor engagements, and orchestrating high-stakes meetings and events. The ideal candidate is a seasoned executive partner who operates with autonomy and sound judgment, anticipates needs before they arise, and helps build the structure and processes that allow a growing organization to run smoothly. This individual handles sensitive information with discretion, embraces new technologies to work smarter, and thrives in a high-growth environment where priorities shift quickly and reliability is non-negotiable.

Duties & Responsibilities:

• Provide high-level administrative support to C-Suite executives including calendar management, travel coordination, and meeting preparation
• Serve as a highly trusted partner to executive leadership, providing responsive support during business travel, company events, and time-sensitive situations, including occasional availability outside standard business hours
• Anticipate executive needs and proactively identify solutions to ensure seamless operations effective team support
• Prepare and edit correspondence, presentations, documents as needed
• Coordinate and schedule internal and external meetings, board meetings, advisory board sessions, and investor call
• Own the logistics of high-density investor and industry conferences, including scheduling and tiering back-to-back meetings, securing rooms and accommodations, coordinating materials, and managing real-time changes as agendas shift
• Manage expense reporting and reimbursements for senior leaders
• Handle sensitive and confidential information with discretion and professionalism

General & Administrative Operations

• Support day-to-day office operations including vendor management, supply ordering, and facilities coordination
• Serve as a point of contact welcoming visitors in a friendly and professional manner
• Support HR, Finance, Operations teams with administrative tasks as needed
• Coordinate company events, team outings, and all-hands meet
• Organize and maintain departmental files and records including updating SharePoint

Required Qualifications & Experience:

• Bachelor’s degree with five to eight plus years of progressive Executive Assistant or senior administrative support, preferably supporting C-Suite executives within the biotechnology, or life science industry
• Demonstrated commitment to and passion for an Executive Assistant career path, with a track record of serving as a strategic partner to senior leaders
• Experience supporting multiple executives in a fast-paced, high-growth environment preferred
• Experience supporting executives through periods of significant organizational growth, transition, or increased external scrutiny strongly preferred; familiarity with board, investor, and public-company process a plus
• Ability to build trusted relationships across all levels of the organization and exercise sound judgment in handling sensitive matters

Desired Skills:

• Positive, energetic, and collaborative approach with a demonstrated ability to contribute to and strengthen company culture
• Strong sense of ownership and accountability with a willingness to provide support when urgent business need arise
• Resourceful problem-problem solver who continuously seeks opportunities to improve processes and increase organizational effectiveness
• Proficiency with modern productivity tools and demonstrated interest in leveraging AI-enabled technologies and automation tools to improve efficiency, streamline work flows and enhance administrative support capabilities
• Ability to balance and prioritize multiple projects
• Prior experience supporting executives in investment banking, financial services, or another high-stakes, deadline-driven environment is highly valued

Compensation & Benefits:

Diagonal offers a competitive compensation package, including an annual bonus, and equity-based compensation. Benefits include contributions to a tax-advantaged health savings account and comprehensive medical, dental, and vision insurance. We recognize the value of diversity in our workforce and are committed to equal opportunity. We consider all qualified employment applicants regardless of race, religion, color, gender, age, national origin, sexual orientation, gender identity, partnership status, protected veteran status, disability, or any other status protected by federal, state, or local law. Individuals who hold legal work authorization applicable to employment in the United States will be considered without regard to citizenship/alienage.