GTMnow · Nov 11, 2026 · 40m · 32m saved
With Reggie Marable, Chief Customer Officer at Sierra
Sierra reached $100M of annual recurring revenue about seven quarters after launch, then doubled to $200M in six months and to $400M in five. Reggie Marable, chief customer officer at Sierra and its first sales hire, told Sophie Buonassisi of GTMnow how the AI customer-service company got there, adding $150M in the third quarter of 2026 alone.
Most software companies charge for seats or usage. Sierra charges only when its agent finishes the job without a human stepping in.
"If you hire Sierra to do a job and we can't handle it or it has to go to a human, we don't get paid." — Reggie Marable
Reggie joined in January 2024 as employee 23, a month before Sierra came out of stealth with $110M from Sequoia and Benchmark. He left leadership roles at Salesforce and Slack to build its sales team from scratch.
The full interview is covered here so you can skip it. 40 minutes of audio, 8 minutes of reading.
Here are the 9 lessons that matter.
Key Takeaways
Sierra went from $100M to $200M of ARR in 6 months, then to $400M in 5 more
Sierra gets paid only when its agent resolves the issue; an escalation to a human earns nothing
Engineers who build an agent stay on the account for the life of the relationship
Every Sierra employee is in sales, the founders included
Sales teams are organized by industry, so reps arrive knowing the client's business
The basics of selling have not changed, whether the product is phones or AI agents
Customer-service staff are becoming "AI architects" who manage agents instead of taking calls
1. A Pay Cut to Join Sierra
Reggie anchored his move from Salesforce on four things: the founders, Bret Taylor and Clay Bavor, the scale of AI, the chance to build a generational company, and a duty to open doors for other minority leaders in tech.
Reggie Marable bet his career on AI being bigger than the internet
"AI is going to change everything. It is changing everything. This is going to be bigger than the internet." — Reggie Marable
The move cost him money up front, and his family noticed.
"I remember sitting right here when they gave me the offer, and it was a tremendous pay cut. And my wife was like, are you insane? What are you doing?" — Reggie Marable
He summed up the decision with a line from Muhammad Ali: "if your dreams don't scare you, they're not big enough."
