People · operator entity page
Mackenzie Castro · Senior Executive Assistant
Mackenzie Castro, Senior Executive Assistant as an independent operator in San Diego. A senior executive assistant is the operational backbone that keeps a leader, and often a whole company, actually functioning — the most underrated operator role there is. SideGuy is the operator-honest small-team tech, AI and SEO layer — built by a North County neighbor.
Who she is
Neighbor to neighbor
Mackenzie Castro is senior executive assistant. A senior executive assistant is the operational backbone that keeps a leader, and often a whole company, actually functioning — the most underrated operator role there is. SideGuy is the operator-honest small-team tech, AI and SEO layer — the kind of help a small team can use without an agency or a six-figure tooling bill.
What a SideGuy does for Mackenzie
Neighbor to neighbor
- The backbone nobody credits — EAs run the real operating system behind every executive. SideGuy is the operating layer behind small businesses. Same quiet-essential role.
- Master of the details — you keep complex things from falling apart. SideGuy keeps the tech from falling apart for operators. Same superpower.
Mackenzie, a senior executive assistant is the operational backbone that keeps a leader, and often a whole company, actually functioning — the most underrated operator role there is. I made you this page because I could, not because I want anything. It's yours to keep.
Want to try a tech department for an hour?
I'll give it a quick first look. No Calendly · no meeting · neighbor to neighbor.
Either way · I'll give it a quick first look. Text PJ at 858-461-8054. No Calendly · neighbor to neighbor.
Find Mackenzie publicly
her work, not ours
- LinkedIn: Mackenzie Castro
- Company: Mackenzie Castro · Senior Executive Assistant · San Diego
Same lane on SideGuy
North County Operators
Related on SideGuy
North County coastal substrate
- The SideGuy Operator Network → the living map of every North County operator we've built a page for — you're on it
- Operators near Mackenzie in this lane
- Mariana Young → North County operator in North County
- Marina Segedy → North County operator in North County
- Mathew Merizalde → North County operator in North County
- Matt Goldberg → North County operator in North County
- The North County operators cluster → every North County general operator on SideGuy
- San Diego operator network → all the neighbors in one place
- Local NCSD → the coastal operator network
- About PJ Zonis → the single operator behind this page
- People we work with → the broader operator index