You didn't start a business to work around the clock; you started it for freedom. At ONE & MAIN, we believe that what you do should serve your life, not consume it. We are your MarTech agency partner, crafting a sustainable, customer-centric future for your company by merging high-impact Marketing and Technology solutions. We offer the competence of a large-scale agency with the efficiency and personalized commitment of a professional boutique firm.
We were founded in 2012 on the simple premise that business owners deserve a unified, expert guide through their marketing, technology and digital landscape. That guide is Sean Riordan, a full-stack developer and technology advocate whose expertise forms the bedrock of our methodology.
Sean Riordan
Founder / CIO & MarTech Strategist
Digital strategist and technology advocate, Sean is designated as a Certified Exit Planning Advisor (CEPA), bringing a long-term, value-driven perspective to every strategic roadmap. He champions the purposeful use of technology, having shared his insights at major conferences including Microsoft Ignite (2024) and as an invited speaker at Amazon HQ (2025), Smartsheet Engage (2025) and the Microsoft Power Platform Conference (2025). His high-level, industry-recognized expertise ensures every strategy we build is founded on cutting-edge, sustainable solutions. As a global technology leader, Sean previously served as the Head of Global IT for Operation Smile, overseeing the management and implementation of technology projects for the organization and its 42 foundations worldwide.
While other agencies focus on temporary campaigns, we focus on infrastructure. We are your MarTech agency, dedicated to outfitting and servicing your entire business. This focus is what allows our clients, from starts up to commercial enterprises, to truly flourish. We outfit your business with a cohesive system of modern software, platforms, AI, and digital marketing tools that ensure continuity and scalability.
Our MarTech Value, Deconstructed:
We understand that every business has unique needs. We’ve broken down our services into three highly flexible and impactful ways to work together.
Expert Advisor: Strategic Roadmapping
This is where we define the why and the what. We deep-dive into your operational bottlenecks and growth ambitions, and then we design the optimal technology architecture and marketing roadmap for your future.
The Efficiency Engine: Project Management
You have the vision, but need expert leadership to execute a complex technology or marketing rollout. We step in as the driving force, managing vendors, coordinating implementation, and ensuring the project is delivered on time, within budget, and to specification.
The End-to-End Build: Full Implementation Partnership
This is our most comprehensive and impactful offering. We are your complete agency partner, handling the high-level strategy, managing the project, and executing the full technical integration and deployment of your MarTech stack and digital campaigns.
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