Results you can count on.

Custom Agents

How Go Nimbly became an AI‑first agency.

“For the last ten years, we’ve been committed to becoming a tech‑enabled agency. In the last six months, we’ve made more progress toward that than we did in the first ten.”

Jen IgartuaCofounder & CEO, Go Nimbly
Read the case study
1:1 AI Coaching

250%+

paid conversion increase

“I thought I was an AI power user… until Mark made me realize I had no idea what was actually possible.”
Angel OlavarriaCEO, Strive Skin
Executive AI Workshop

80%

of employees use AI every week

“Mark really helped us develop the framework. Once we had that, I felt comfortable with our executive team leaning in. This led to 40% revenue growth.”
Michael BoordPresident & COO, ServiceCore
Mark Fershteyn

I run my sales on AI agents. Want the same?

I’ve spent 15 years in B2B sales and GTM, including 7 years running Recapped, a B2B sales software company. Today agents do my prospecting, outreach, follow-up, CRM updates and content. I approve the work and talk to buyers. We build the same system for companies of 20 to 500 people.

What your life could look like.

Drag to compare before & after

Example week · operations lead

Week of November 2

Monday: 2h of busywork handled. 8h across the week.

Before

8 AM

Inbox

9 AM

Monday update

10:30 AM

Ops review

2 PM

1:1s

After

8 AM

Sorted. Replies drafted.

9 AM

In your inbox at 6am

10:30 AM

Ops review

2 PM

1:1s

An example week, sized to what one client measured: 8 hours saved per person, per week.

Agents built by you, or by us.

My own GTM runs on agents like these. We build the same system for your team.

Missed-call agent

Every missed call, texted back in seconds.

It qualifies the caller and books the visit. The lead never dies in voicemail.

Quote agent

Quotes out in minutes. You just approve.

A request lands. It prices the job, drafts the quote and sends it when you say yes.

Monday pack

The weekly update is done before you wake up.

It pulls the numbers, writes the recap and puts it in your inbox at 6am.

Follow-up agent

New lead. Researched. Replied. Under 60 seconds.

Nothing goes cold because someone meant to get to it.

Pre-call brief

One page on everyone you're about to meet.

It lands thirty minutes before the call. No Googling in the lobby.

Inbox triage

Your inbox, sorted. Replies drafted in your voice.

You only touch what actually needs a human.

In their words.

3 internal tools shipped

“Last month I was just asking ChatGPT to write emails. Now I’ve built a client onboarding tool, and my team probably thinks I hired a developer.”

VP of Operations

Series B SaaS

“Mark built us an amazing application that our team uses daily. Made our lives so much easier!”

Dan Guidebeck

Custom application client

“Before MasteringAI, I was mostly learning through trial and error, piecing together information from different places. The course gave me a much clearer framework for using AI effectively and showed me workflows I wouldn’t have discovered.”

Bibiana Lorscheiter Afonso

via Google

“Awesome. Couldn’t recommend more.”

Lev Fer

Course graduate

“The AI Operating System really calls me out, which is fantastic. Now the whole team shares one definition of what “done” means.”

RevOps Architect

100-person RevOps consultancy

10+ hrs/week back

“Research that used to take me half a day now takes 20 minutes. Competitor analysis, market research, customer interviews - all transformed.”

Strategy Consultant

Management Consulting

“Mark built a custom platform for our team and it’s been a game changer for visibility into our day-to-day and automating more of our project management.”

Emily McGrath

Custom platform client

“I knew nothing about AI before taking this course, only that it was intimidating and confusing. After taking this course, WOW!”

Anna Druker

via Google

“Mark took time to provide custom approaches to learning Claude Code. In other words, it wasn’t just a video series that you could grab off YouTube.”

Jason Brown

Claude Code course graduate

“Great course!”

Farha Atbai

Course graduate

Spec-to-build cut 40%

“I finally understand what my engineering team is talking about. More importantly, I can spec out AI features without needing them in every conversation.”

Product Leader

Fintech

“This is going to be our operating system for the practice.”

Engagement Manager

100-person RevOps consultancy

“Practical, well structured, and focused on actually applying what you learn, not just watching another series of videos and pretending that counts as progress.”

Craig Henehan

Claude Cowork & Code course graduate

“It was very helpful and I highly recommend for anyone looking for a course that is easy to understand.”

Sofia Zises

Course graduate

“This gave me the necessary tools to not just ship apps, but build them with quality and making them look way better.”

Deyves Senger

Course graduate

70% less content time

“The prompt engineering framework alone saved me. I was getting mediocre AI outputs for months. Now I get usable first drafts 90% of the time.”

Marketing Director

E-commerce Brand

“I learned a great deal and have referred this program to many senior leaders I work with as well.”

Eli Blair

Course graduate, senior leader

“Having everything in one AI OS view lets me see where things should move quicker and where they’re on pace.”

RevOps Consultant

100-person RevOps consultancy

“Mark’s training course was so easy to understand! I really appreciated how readily available he was for any questions I had.”

Ilana Rachelle

Course graduate

“Very practical examples to overcome the learning curve for AI and amazing ROI. Would highly recommend Mark and the team.”

Jordan Wan

via Google

5.0 rating on GoogleRead all reviews and case studies

Questions, answered.

Book free consultation

Companies that bought AI tools and still do not see them in the work. And people who want to build with AI without becoming a developer.

No. If you can write an email, you can do this. Most of the people we train are not developers.

We train your people on their real work. Then we build custom agents that keep running after the workshop. You own the code.

We do not teach the tool in the abstract. Sales learns on your pipeline. Ops learns on your tickets. You leave with agents in production, not a slide deck.

Software that does a job on its own: missed calls, quotes, follow-ups, CRM notes. We build it on your stack. In weeks.

No. That is the first thing we figure out. Start with the free audit or a 30-minute call.

Same method we teach companies. AI Essentials if you are new. The AI Builders Bootcamp if you want to build your own system.

A founder replaced $78K of agency work. A 15-person sales team cut research time 83%. An 18-person GTM team hit daily AI use in two weeks.

Book a free 30-minute call. We look at where you are and name the first three agents we’d build. If it’s a fit, the next step is a two-week AI Audit: a baseline of your numbers and a ranked list of what to build first.

What will you build?

The weekly dispatch

What actually worked this week.

The AI news that matters, the tips worth stealing, and a playbook you can run the same day.

Talk to us

Not sure where to start?

Thirty minutes on where you are. You leave with the first three agents we’d build, either way.