About Yellowfin Development

Yellowfin Development was founded in 2013, but the experience behind it goes back further. Stephen Knight served as a computer operator in the U.S. Marine Corps before spending nearly three decades building websites professionally – across agencies, in-house development teams, and hundreds of direct client engagements spanning healthcare, finance, nonprofits, entertainment, retail, and professional services.

Based on Long Island, New York, Yellowfin serves small businesses and entrepreneurs across the United States. Every project is handled directly by the owner. No account managers, no outsourcing, no hand-offs. You get one experienced developer who knows your site inside and out, answers when you call, and treats your business like it matters.

Stephen is Google Ads certified and Google Analytics certified. Every recommendation is grounded in data, not guesswork.

“He takes your vision and brings it to life. Whether it’s a small fix or the world is burning – he’s on it like you’re his only client.”

Johnny OBrien – Hero Down Foundation

“He was professional, fast, and his work was solid. Stephen is now our main go-to developer whenever we need anything done right the first time.”

Rich Callaghan – Client

Every engagement starts with a conversation – not a proposal, not a sales pitch. We talk through what you have, what you need, and what actually makes sense for your budget and your goals.

From there it is straightforward. We build, you review, we refine. Most projects go from kickoff to launch in two to six weeks. You are involved as much or as little as you want – some clients are hands-on at every step, others hand it off and check in at the end. Either works.

Most clients stay on after launch. We handle updates, manage hosting and email, monitor performance, and are reachable when something needs attention. That ongoing relationship is how we work best – and where we deliver the most value.