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María Silvia Castillo

Based in Argentina · Works US hours · EN + ES

EN ES Executive Support · Soporte Ejecutivo

A Bilingual Executive Virtual Assistant Who Works Your Hours

I take your inbox, calendar, client follow-ups and admin off your plate — with flawless English, real Spanish, and hours that overlap your US workday. Near-shore quality, far-from-US pricing.

  • Fortune 500 experience
  • Flawless EN · native ES
  • US-hours overlap
María Silvia Castillo — bilingual executive virtual assistant

The Admin Is Eating Your Week

You didn't start your company to live in your inbox.

  • Your inbox is a mess and you miss the emails that matter.

  • You spend your best hours on scheduling, follow-ups and busywork.

  • A full-time US hire costs $60k+ a year for support you only need part-time.

  • You tried offshore — and the 12-hour gap broke communication.

There's a smarter way to scale.

The Nearshore Advantage: Premium Support, Zero Friction

Work in Real Time

My workday overlaps US business hours, so replies come in hours — not overnight. No more waiting 24 hours for an answer.

Executive Support, Not US Overhead

C-Level-grade support without payroll, taxes or benefits. You pay for productive hours, not headcount.

Flawless Communication, Real Spanish

Natural, clear English in every interaction — plus native Spanish for your Spanish-speaking clients, partners and vendors.

Argentina ranks #1 in Latin America in the EF English Proficiency Index

Ready to delegate?

Let's talk about what you need and build a plan that fits. No commitment.

Send Me a Message

How I Protect Your Time and Energy

Inbox & Calendar Management

Email triage, ruthless calendar defense, and meeting scheduling across time zones.

CRM & Operations

Data entry, CRM hygiene (HubSpot, Salesforce), and pipelines that stay current.

Client Communication

Proposals, follow-ups, and support tickets that make your clients feel cared for.

Travel & Logistics

Flights, itineraries, and expense tracking — handled, so you can stay focused.

Fluent in the tools you already use

  • Slack
  • Asana
  • Google Workspace
  • Zoom
  • Notion
  • ChatGPT
  • HubSpot
  • Salesforce
María Silvia Castillo — bilingual executive virtual assistant
Direct Support
No agency, just me

Why Teams Trust Me With Their Week

I spent years supporting C-Level leaders at Fortune 500 companies like ExxonMobil and Weatherford — supply chain, communications, travel, and executive calendars. I learned what impeccable really means at scale.

I'm not an agency and I'm not a task-taker. I'm one person who takes real ownership: a proactive partner who protects your time, anticipates what you need, and removes the operational noise.

Native Bilingual
Flawless EN · native ES
C-Level Experience
Senior executive support
Timezone Aligned
Works your US hours

From Overwhelmed to Organized in 3 Steps

  1. Your Message

    You tell me by email what's eating your time and energy, and how your business works.

  2. Customized Proposal

    A tailored plan of hours, tasks, and what to expect in the first 30 days.

  3. Seamless Handoff

    We set up your channels (Slack or email) and I take over the operational noise.

A Track Record That Speaks for Itself

Roles I've held — and the operational depth they bring to your business.

Administrative Assistant to Management

Owned calendar, budgets and international travel logistics for an executive team. The exact operating discipline I bring to your inbox every day.

Regional Executive Assistant

Supported C-Level leaders regionally: high-stakes coordination, strict itineraries, zero-margin-for-error deliverables. Proactive support is my default, not an upsell.

Frequently Asked Questions

Straight answers to the questions founders usually ask.

Ready to Get Your Time Back?

Let's build a system that works for you — without the overhead of a US hire.

Tell me what's eating your time and energy. I'll reply within 24 business hours with next steps.

100% confidential · I reply within 24 business hours