Luis Sonsin
Montague,MI
Summary
Strategic and multilingual Senior Executive Assistant with over a decade of experience supporting C-suite and senior leadership across Fortune 400 enterprises, high-growth startups, and international organizations.
Bridging strategy, operations, and executive partnership, I operate at a chief-of-staff capacity—anticipating priorities, enabling executive focus, and driving clarity across cross-functional initiatives.
As a first-generation immigrant, I’ve learned to adapt quickly, build trust across cultures, and sustain seamless operations in environments where precision and empathy must coexist.
I thrive in creating and managing the everyday structure, clarity, and rhythm that allow leaders and teams to perform at their highest level, driving stronger alignment, faster decision-making, and measurable business impact that enhances leadership capacity and organizational effectiveness.
Overview
2026
2026
years of professional experience
Work History
Senior Administrative Assistant |
Starbucks
3 2023 - 07.2025
- Partnered directly with the VP of Coffeehouse Development and the Director of Construction (West Zone) to drive strategic alignment across business priorities.
- Prepared comprehensive reports and presentations for senior management, ensuring accuracy and adherence to brand standards.
- Acted as a liaison between senior leadership and cross-functional teams, ensuring seamless communication, operational clarity, and execution of strategic initiatives.
- Operated at a chief-of-staff level by managing executive priorities, surfacing data insights, and streamlining workflows to enhance decision-making.
- Directed onboarding, culture, and DEI initiatives to strengthen team cohesion and engagement across distributed teams.
- Led the planning and execution of QBRs, off-site, and high-visibility meetings, delivering stakeholder-ready presentations, and ensuring optimal outcomes.
- Proactively solved complex problems, adapted to dynamic business needs, and supported leadership in a fast-paced, growth-oriented environment.
- Managed complex calendars, scheduling meetings and coordinating travel arrangements for executives.
Senior Operations Program Manager
The Fertility Agency
05.2017 - 05.2023
- Supported founders as a strategic extension of leadership; managed operations and vendor relations with high confidentiality.
- Scaled an international egg donor program to 30+ countries, improving client outcomes, and operational efficiency.
- Led cross-functional teams to streamline fertility program operations and enhance patient experience.
- Developed and launched a proprietary matching system, reducing donor match time by 58%, while enhancing the user experience.
- Implemented process improvements that increased operational efficiency across multiple departments.
- Spearheaded global expansion efforts by establishing new regional offices, recruiting local talent, and adapting operations to suit market conditions.
- Increased donor earnings by over 47% and reduced onboarding time by more than 90% through process optimization and marketing innovation.
Au Pair Exchange Student
InterExchange
12.2013 - 12.2015
- Accepted into an exchange visitor program and responsible for working directly with families to develop and implement childcare plans, modeling appropriate social behaviors, organizing recreational activities, ensuring child safety, and other childcare-related functions.
- Met all U.S. Department of State's regulations for the program, and received outstanding references upon program conclusion.
- Fostered cultural exchange by sharing language and traditions with host families.
- Coordinated daily schedules, ensuring timely completion of tasks and activities.
- Mentored new au pairs, providing guidance on best practices and cultural adaptation.
International Lead Flight Attendant
TAM Airlines
10.2008 - 09.2013
- Supervised cabin crew to ensure adherence to safety protocols and service standards.
- Coordinated in-flight services, enhancing passenger satisfaction through effective team collaboration.
- Conducted training sessions for new flight attendants, improving onboarding efficiency and knowledge retention.
- Resolved passenger inquiries and concerns promptly, fostering a positive travel experience.
Education
Associate of Arts - English Communication & Teaching
Mackenzie Presbyterian University
Sao Paulo, SP Brazil Skills
- Executive-Level Communication & Cross-Functional Alignment
- Strategic Calendar, Inbox & Priority Management
- Executive Meetings, Offsites & Culture-Building Initiatives
- Financial Administration & Platform Expertise (Concur, Egencia / SAP Concur Travel, Tableau, Microsoft 365)
- Leadership Enablement & Organizational Effectiveness
- Culture, DEI & Engagement Initiatives
Languages
English
Native or Bilingual
Portuguese
Native or Bilingual
Spanish
Professional Working
Timeline
Senior Operations Program Manager
The Fertility Agency
05.2017 - 05.2023
Au Pair Exchange Student
InterExchange
12.2013 - 12.2015
International Lead Flight Attendant
TAM Airlines
10.2008 - 09.2013
Senior Administrative Assistant |
Starbucks
3 2023 - 07.2025
Associate of Arts - English Communication & Teaching
Mackenzie Presbyterian University