Sean MacMannis

Operating Partner, Growth & Client Success at Tribe Designworks

Go-to-Market (GTM) StrategyProduct Marketing (PMM)Brand FoundationPositioning and NarrativePerformance AdvertisingGrowth Systems

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About

I'm Sean MacMannis, currently an Operating Partner at Tribe Designworks where I focus on Growth and Client Success. My career has been defined by helping companies find market clarity and scale—from building Pinterest’s conversion ads business into a $1B+ engine to leading marketing for decentralized ecosystems like Gitcoin. I’m a big believer in the power of generalists and the importance of a strong brand foundation. I’m passionate about bridging the gap between a great product and a compelling narrative, especially for technical founders. Whether it's discussing GTM strategy, Web3 governance, or training for my next marathon, I'm always looking to connect with people who value trust and personal alignment over simple deal optics.

Networking

What I can offer

›Senior GTM support without the need for an in-house hire
›Pricing and messaging sprints
›Scaling conversion ads and growth motions
›Mentorship for generalist leaders

Looking for

›Ambitious technical founders struggling with narrative clarity
›Expanding my professional network
›exploring mutual opportunities in Web3, AdTech, and SaaS

Best fit for

Technical foundersWeb3 buildersGTM advisorsProduct leaders

Current Interests

DAOs and public goods fundingDecentralized mediaDesign systems in brand buildingLong-distance runningInternet-native networking

Background

Career

A seasoned GTM operator with a history of scaling ad platforms at Yahoo and Pinterest, followed by leadership roles in Web3 and marketing leadership at Gitcoin and Nerd Apply.

Education

M.B.A. from UC Berkeley Haas School of Business (2016–2019); Bachelor’s Degree in History from Dartmouth College (2001–2005).

Achievements

›Scaled Pinterest conversion ads from 0 to $1B+ annual revenue
›Led 20-person marketing org at Gitcoin distributing $20M+ in grants
›Helped Nerd Apply founders close $3.2M seed round in <90 days
›Transformed NextRoll into a $100M+ revenue full-funnel platform
›Completed the 2025 Honolulu Marathon

Opinions

AI can execute UI but cannot replace the human need for brand foundation and direction.
The 'Brian Chesky' model of merging product and narrative is superior.
Generalism is a career asset; specialists often hit a leadership ceiling.
Fewer layers between founders and workers is a competitive advantage.