We built the tool we needed to deliver.
OneSpark started as the internal system behind our software studio. After 20+ real client projects, we opened it up so every tech team can plan, build and ship from one Living Spec.
Two founders met in Ukraine. One had a system. One had the problem it solved.
In the summer of 2024, Jarrett Dargusch went to Ukraine to help refugees of the war. There he met Anton Dzhanaev, a software engineer with 20 years of enterprise experience and teams of up to 25 engineers behind him.
In the summer of 2025, Anton started building an agentic system around his own tech team: how they plan, how they review, and the delivery standards they hold every project to. Not AI replacing engineers. AI that follows the standards good engineers already follow.
Jarrett had spent years on the other side of the table, building products and paying agencies that overpromised and missed deadlines. In November 2025, Anton reached out. He finished a feature in a few hours that Jarrett's paid team had scoped at a week, and they decided to build together.
AI can write code fast. What it can't do on its own is keep a whole project on plan as it grows.
That became the founding idea. Every project gets a written spec before any code exists, and every change goes through it. The spec is what keeps a team and its AI working from the same context.
Proven on client work before anyone else used it
Summer 2024
The founders meet
Jarrett meets Anton in Ukraine while doing humanitarian work.
Summer 2025
Anton begins building his agentic system
He turns his tech team and its delivery standards into an agentic system.
Nov 2025
Anton reaches out
He shows Jarrett what the system can deliver.
Jan 2026
OneChair opens
A software studio created to prove the system on real client work.
Jan to Aug 2026
20+ client projects
Healthcare platforms to marketplaces, all built on the system.
Aug 2026
OneSpark becomes its own company
The internal system becomes a product for every tech team.
Oct 2026
Open to every team
OneSpark opens to tech teams everywhere.
What our system delivers
- 20+client projects delivered by our studio
- 27 hrsaverage build, start to finish
- 97%faster than a traditional delivery team
- Multipleapps built to compliance requirements like HIPAA
Four rules we built OneSpark on
Plan before code
Every feature gets a written spec first. The AI builds against it instead of guessing from a chat.
Nothing hidden
Every decision is written down where your team and client can read it, change it and approve it.
Standards and context at scale
Your whole tech team and our agentic system work from the same spec, so standards and context hold no matter how many people or features you add.
Your product is yours
You own the spec, the documents, the designs and the code. We don't train on your projects.
The people behind OneSpark
Jarrett Dargusch
Leads strategy, go-to-market and customer relationships. Nearly a decade building businesses across cultures, including two companies of his own. Based in Central Florida and active in the Orlando founder community.
- Master's, International Business
- 10 years building businesses
Make software built with AI as dependable as the plan behind it.
We're building the place where a whole team plans, builds and changes software with AI, on every app, new or existing, from the first idea to every release after.
See what one Living Spec can do for your team.
Generate your first PRD and plan in about 7 seconds. No card needed.
Start building freeQuestions or partnerships: support@onespark.dev