Syntax Circus — an independent software studio
Syntax Circus builds clear, useful, thoughtfully made software and writing.
Founded by Jon Seeley, Syntax Circus is an independent software studio bringing together featured projects, book updates, and long-form writing for people who value clarity, curiosity, and craft over noise.
What lives here
A small collection of work, writing, and updates worth following.
Projects
Tools and experiences built for people with real needs — starting with Core Musica, a serious listening app for people who care about their own music library.
Book
A long-form book on software craft and career judgment, written by Jon Seeley for readers who want work that compounds and stays useful over time.
Writing
Jon Seeley's long-form essays on software, leadership, and the decisions that shape a meaningful career — honest work for people who think carefully.
Now available
Core Musica is live.
Core Musica is a serious listening tool for people who care about their own music library, richer metadata, and discovery that feels intentional instead of random.
It helps listeners build playlists, explore similarities across their collection, and stay focused on the music they already love.
Why people return
Real work, made for real people.
Each thing built at Syntax Circus starts with a genuine question: what would actually help someone? Core Musica began as a tool for people who love their music library and want something better than algorithmic noise. The book begins with the career questions most advice skips entirely.
Whether you are following a product, waiting on the book, or reading an essay, the work here is made with care for the person on the other end — and there is more on the way.
Software that respects your taste
Core Musica is built for people who care deeply about their music library — putting you in control of your listening with intention and depth.
A book for the long game
Jon Seeley's forthcoming book addresses software craft, career judgment, and the wisdom that compounds over time — for readers who think carefully about their work.
Writing worth reading slowly
Long-form essays on leadership, creativity, and meaningful work — honest, unhurried, and written for people who build things and want to keep getting better at it.
Led by Jon Seeley
More than two decades of experience, shared in ways people can actually use.
From finance to retail to digital products, Syntax Circus is built around thoughtful judgment, clear communication, and experiences people will want to come back to.