🔔🔔 Willie McMahon built, scaled, and sold a 45-person engineering business - then walked away to help other founders do it better. 🔔🔔

Willie is giving away 10 copies of the book Traction on a first come first served basis. If you’re running a company with between 10 - 250 employees, contact Willie to get your free copy: [email protected]

Willie McMahon, EOS Implementer and founder of CalX (exited) joins Business Builders to share how he went from a one-man operation to building and exiting a scaling engineering business - and what he learned along the way.

Starting with no plan, no funding, and no support network, Willie built a calibration and instrumentation business from scratch. What began as a solo operation grew into a 45-person company, navigating cash flow pressure, hiring challenges, and the realities of bootstrapping - before eventually merging and exiting.

But the journey wasn’t smooth. Growth nearly broke the business multiple times. Hiring mistakes, cash constraints, and operational complexity forced hard decisions - including turning down major opportunities that could have destroyed everything.

Willie shares how 90-day execution cycles and relentless problem-solving helped them scale - even before formally discovering EOS (Entrepreneurial Operating System).

The conversation dives into what actually drives business success: people, structure, and clarity. Willie explains why most problems are not what they seem, why founders are often the bottleneck, and how systems - not effort - create scalable companies.

He also opens up about the emotional side of building and selling a business: risk, fear, responsibility, and the moment you realise you’re responsible for other people’s livelihoods.

Now working with founders through EOS, Willie helps businesses break through growth ceilings, build stronger cultures, and create structure that enables freedom.

This is a conversation about entrepreneurship, scaling, leadership, and building a business that actually works.

“It's not the person - it's the system around them.”

🎧 In this episode, you’ll learn:

How Willie built and scaled a business from 1 to 45 people
 Why most businesses hit growth ceilings (and how to break through them)
 The reality of bootstrapping and managing cash flow
 Why hiring “another you” is a mistake
 How to think about risk as a founder
 Why short-term (90-day) thinking drives long-term growth
 The importance of culture and hiring the right people
 How to structure a business for scale
 Why most problems are systems problems, not people problems
 The emotional reality of selling a business
 How EOS helps founders gain clarity, control, and freedom
 Why you must grow as a person to grow your business

⏱️ Timestamps

00:00 - Cold open
 00:55 - Introducing Willie McMahon and EOS
 02:00 - What calibration and instrumentation actually is
 05:00 - Early career and falling into the industry
 08:30 - The moment he decided to start his own business
 11:00 - First hires and early hiring mistakes
 14:30 - “I didn’t need another me”
 16:00 - Bootstrapping and surviving on cash flow
 18:00 - 90-day targets and early growth
 21:00 - Becoming an employer and responsibility for people
 23:00 - Turning down a huge opportunity
 26:00 - Fear, risk, and decision-making as a founder
 30:00 - Discovering EOS and business frameworks
 33:00 - Why founders must grow to scale their business
 37:00 - Building culture (and the fictional character hiring test)
 42:00 - Merging the business and scaling rapidly
 46:00 - Managing operations, hiring, and field teams
 53:00 - Marketing tactics that actually worked
 57:00 - Growth during COVID and scaling chall