BUILDSIDE
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Whether you're validating an idea, already operating and want a sharper partner, or need an operator embedded inside the business — we build with you, not from the sidelines.
Buildside meets companies and founders where they actually are.
You know the problem. You see the opportunity. We validate it, shape it, position it and build the infrastructure required to turn an idea into an actual business.
Venture validation · Business design · Brand · GTM · Capital readinessThe company exists. Buildside becomes the experienced builder beside you — pressure-testing decisions, finding blind spots, opening doors and helping turn strategy into action.
Founder coaching · Growth strategy · Capital strategy · GTM · Decision supportBuildside embeds as fractional CEO/COO — taking operating ownership, building the team and systems, driving execution and helping lead the company through its next stage.
Fractional CEO · Fractional COO · P&L ownership · Fundraising · Operations · ScaleYou've spent years seeing something other people don't. We find out whether there's a company inside it — and build it with you.
You've accumulated expertise, relationships and pattern recognition. Now you're ready to turn those assets into something you own.
You have customers, revenue, maybe employees — and you're still making too many consequential decisions alone.
An operator embedded in the company. Not someone circling it.
Buildside isn't hired to produce deliverables. We're hired to create progress. What that requires changes with the company.
20+ ventures. 15+ industries. One common denominator: we got inside the problem.
We're in the business with you — not handing you a framework and wishing you luck.
Idea, first revenue or scaling — every venture gets the same rigor: validated story, real infrastructure and execution that holds.
We stay through go-to-market, growth and — when it's the right fit — as embedded operating leadership.
Founder. Operator. Agency builder. Global practice leader. Fractional CEO/COO. Investor. Mentor. Marketer. Fundraiser.
Brian Cross helps operators, agency leaders and founders convert what they already know into equity—turning hard-won expertise into companies, exits and durable assets instead of billable hours.
Brian built his first agency in 1999, another in 2003, and Elasticity beginning in 2009. Since 2015, he has also served as an embedded fractional CEO/COO for early-stage companies—owning P&L responsibility from pre-revenue through $5M–$10M in scope and leading capital raises from angel checks to institutional rounds.
BUILD“It felt like having a true partner who could see the opportunity and push it forward alongside me.”
Founder, Bullsh!t Lawn and GardenFull story“Working with Brian brought the business to life in a way I couldn't have done alone. He helped turn ideas into a clear, compelling business with real structure and direction. More than anything, it felt like having a true partner who could see the opportunity and push it forward alongside me.”
Founder, Bullsh!t Lawn and Garden
BUILD“When Brian engages with an idea, it moves forward.”
Founder, MedSessions & National Providers AllianceFull story“I've known Brian for more than 35 years across multiple businesses, and he consistently sees opportunities and connections that others miss. He combines creativity, strategic thinking, and an exceptional professional network with a level of integrity that makes him someone I trust without hesitation. When Brian engages with an idea, it moves forward.”
Founder, MedSessions & National Providers Alliance
COACH“He guides companies through the difficult process of figuring out who they are.”
CEO, InfiFull story“I have seen Brian bring real value to early-stage companies as he has guided them through the difficult process of figuring out who they are and what their business model is. He has extensive experience creating stories, refining pitch decks, building businesses and raising capital.”
CEO, Infi
COACH“His support can be the difference between success and failure.”
Founder, ObseshFull story“Brian Cross is one of those rare individuals who has an exceptional ability to both build a product and market a product. He knows how to navigate the critical balance between audience, technology and pop culture to build services and products that fill a gap and have high potential for success. He also cares hugely about founders, and his support can be the difference between success and failure.”
Founder, Obsesh
BUILD“He didn't build it for me. He built it with me.”
Founder, Sissy + SnapFull story“I was eleven years old with an idea for a purse company. I didn't know what a brand was. I didn't know what a market was. I just knew I wanted to make something. My dad helped me see that my little idea was actually a real business—and then he helped me build every piece of it. We created the brand, designed the product, launched it, and I won Kid Entrepreneur of the Year. He didn't build it for me. He built it with me. That's the thing people don't understand about how he works—he makes you feel like you can do it, and then he proves you're right.”
Founder, Sissy + Snap
COACH“Brian's energy is contagious and inspiring every step of the way.”
Founder, MaxOneFull story“What started out as a mentor-mentee relationship between me and Brian as I was starting MaxOne very naturally turned into a thoughtful marketing partnership with a team he curated around me and the business that I was building. The team was intentional with our budget, flexible as our needs changed, and helpful as we rebranded, built the base of marketing assets, and began acquiring our first customers. Through the process Brian and his team have stayed friends and companions on the journey. Brian's energy is contagious and inspiring every step of the way.”
Founder, MaxOne
Before you trade your time for a percentage of somebody else's company, understand what you're investing—and what you might actually own.
AI can do more than improve efficiency. It may help service businesses turn repeatable expertise into scalable assets.
AI makes building easier. Your experience helps identify what is actually worth building.
A venture co-builder works beside a founder to turn an opportunity into an operating company. Through Buildside’s Build work, that can include validating the problem and buyer, shaping the business model and positioning, building the brand and go-to-market plan, preparing for capital, and putting the early operating infrastructure in place. The role is hands-on and changes with the company; our selected work shows what that can look like in practice.
Yes. Often the starting point is not a polished startup idea but years of pattern recognition: problems you have solved repeatedly, gaps you keep seeing, or an insight others miss. Buildside can help surface those possibilities and test whether one could support a real company. The goal is not to force your experience into a startup or promise there is a company inside it; it is to find out carefully. Our Insight on how to turn expertise into equity explains the thinking behind that work.
We look for evidence: a meaningful problem, an identifiable buyer, urgency and willingness to act, a differentiated insight, and a credible path to deliver and grow. Then we test the important assumptions through customer conversations, market learning, and early validation before overbuilding. A promising idea earns the next investment of time and money; not every idea should become a company. That discipline is central to our Build work.
No. Buildside meets founders where they are. Build is for shaping and validating a new company, Coach is for founders who want an experienced builder beside them, and Run is for businesses that need embedded operating leadership. Having revenue, a team, or an existing company does not make it too late; it often makes the real gap easier to see.
Founder coaching helps you lead the company better by pressure-testing decisions, seeing blind spots, and thinking through the next stage while you retain operating ownership. An embedded CEO or COO joins the leadership team and takes responsibility for execution: operating cadence, priorities, systems, cross-functional decisions, and accountability. Our Fractional COO vs. Consultant Insight goes deeper on the difference between advice and ownership.
Yes, as part of building a company—not as a promise of investment. Buildside can help with capital strategy and readiness, sharpen the company’s story, develop investor materials, strengthen the financial and operating case, and prepare the founder to run a disciplined process. We can help a company become more ready to raise; the decision to invest, and the outcome of any fundraising process, always belongs to the market.
Use the Start a conversation form below. Share your name, email, company or idea, where you are in the journey, and what you are trying to solve. Submitting the form opens a ready-to-send email to Brian; that message starts a conversation about where you are, what is stuck, and whether Build, Coach, or Run is the right way to work together.
Maybe it's still an idea.
Maybe it's already a company.
Maybe it's become something bigger than you can run alone.
Tell me where you are. We'll figure out what comes next.