03 / The studio
Close to the problem.
Responsible for the answer.
A small, independent practice built around experienced engineers,
first-principles reasoning, and direct collaboration.
Context & selection / Material study
The people doing the thinking do the work.
People we've worked with.
People we'd choose again.
Art assembled Cognitive Horizon from former teammates: senior developers he has worked with, stayed in touch with, and would choose to work with again.
Art leads each engagement and brings in teammates to match the technical challenge and the client's budget.
We work as a technical partner, taking an active interest in your business succeeding as well as the software working.
AArtFounder & Principal EngineerA foundation earned over time.
First paid contracts
Software development work while still in high school, followed by multiple contracts a year in 1998-2000.
Full-time development
Working full-time in software development since 2003.
Fermat, 1996
Part of a competition background spanning mathematics, computing, and physics.
Working principles
Make uncertainty visible.
An assumption written down can be tested. An assumption hidden in code becomes a surprise.
Use complexity deliberately.
Every abstraction, dependency, and distributed boundary should pay for its place.
Leave the team stronger.
The work is incomplete if the people maintaining it cannot explain why it is built that way.
Client correspondence
In the client's
own words.
Feedback from Art's individual
engagements on Upwork.
“Artur is far more than a freelancer; he can lead a complex, enterprise-level build from the front.”
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Working with Artur was one of the best decisions I made building this company. He architected the core of our platform — an MCP server and Stripe Connect payment rail for AI content licensing — and delivered enterprise-grade, production-ready work. He gave freely of his hours, brought expertise that more than matched his rate, and even helped me find additional help to finish the build more affordably. He actively saved me money. His AI-assisted coding stack is genuinely impressive, and beyond the code, he taught me a great deal as a founder about how to work effectively and efficiently. Artur is far more than a freelancer; he can lead a complex, enterprise-level build from the front. I'd hire him again in a heartbeat and recommend him without reservation.
“Every finding included the problem, the business consequence, the exact fix with code, and the acceptance criteria to verify it.”
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Arthur came in as a fractional CTO advisor at a critical moment in our application's development. His architecture review findings were detailed, prioritised, and immediately actionable.
What stood out was the quality of the written output. Every finding included the problem, the business consequence, the exact fix with code, and the acceptance criteria to verify it. Our developer could work from Arthur's notes directly without needing a call to clarify anything.
Beyond the review, Arthur also prepared guidance on Rails 8 best practices and agentic AI development workflow; practical notes that have already changed how our developer approaches the codebase day to day.
Arthur thinks like a CTO, not just a senior developer. He flagged risks we hadn't considered, explained tradeoffs in plain language for a non-technical founder, and was responsive and clear throughout. We're bringing him back for other fractional CTO work.
“Our bugs, which we expected to take one to two weeks to analyze and repair were fixed in one and a half days, including time to study our codebase and on-boarding.”
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Arthur is an exceptionally skilled developer!
Our bugs, which we expected to take one to two weeks to analyze and repair were fixed in one and a half days, including time to study our codebase and on-boarding. We will hire Arthur again when the project's next phase is ready.