Get to know Calarco Consulting
I’m Sean Calarco, founder and principal consultant at Calarco Consulting.
I’ve spent the last decade-plus leading engineering teams at Reddit, Wayfair, Handshake, and The Predictive Index — four companies, two IPOs, and every org size from a scrappy new team to a 100-person department. Along the way I’ve scaled teams past 400% growth, cut millions in operating costs, taken systems from 92% to 99.9% uptime, and led company-wide platform overhauls that touched every team in the building. I’ve made my share of mistakes too; a lot of what I know now, I learned the hard way.
What I bring to a company isn’t a framework off a slide; it’s judgment built from actually running the thing. I started my career at Wayfair as a software engineering intern and left seven years later as a seasoned Director, having helped build the Wayfair Delivery Network from scratch. I’ve hired the engineers, run the postmortems, and made the calls on which architecture decisions actually matter versus which ones are just interesting.
I started Calarco Consulting because I love helping companies grow. I’m a builder; I have been since I started making websites as a kid. So many startups have a great product but don’t know how to scale the people, process, and technology behind it to unlock its full potential. That’s where I come in.
How I work
A few things that shape every engagement, whether it’s a two-week diagnostic or a six-month fractional role.
Judgment over frameworks. Every startup’s problems look unique from the inside. I don’t show up with a template — I show up with a decade of pattern recognition from running these exact decisions myself, and apply it to what’s actually in front of me.
Fix what’s expensive to fix later. Architecture, org design, and hiring decisions are cheap to get right early and brutal to unwind once a team has grown around them. I focus on the calls that compound, not the ones that just feel urgent.
Recommendations aren’t the deliverable — outcomes are. I’ve sat in enough steering committees to know a slide deck full of advice doesn’t move anything by itself. I stay close enough to execution that what I recommend actually ships.
Say the hard thing early. The best engineering cultures I’ve built ran on direct, fast feedback — 5-why postmortems, not blame theater. I bring that same directness to how I work with founders, even when it’s not what they want to hear in the moment.
