You vibe-coded a prototype that mostly works. The Notus is the fractional CTO and MVP development team that finishes it the right way and ships it to real users. Fixed scope, fixed price, from $7,500 in 3 to 4 weeks. You own the code.
AI builders are genuinely good at the first 80%. They produce a working screen flow, a plausible schema, and a demo that looks like a product. The last 20% is the part that decides whether real users can trust it with their money and their data, and it is the part those tools quietly skip.
That gap is where prototypes stall. The auth half-works. The Stripe webhook fires twice and double-charges. The AI feature calls a model on every keystroke and the bill arrives. The database has no indexes and falls over at fifty rows. We close that gap, end to end.
Send the repo, the URL, or just the idea. Within 48 hours we send back a written read on exactly what it takes to get to production. No call required, no cost, no obligation.
You get one number and one scope before any work begins. From $7,500. No hourly billing, no retainer, no scope-creep surprise invoices. You approve it, then we start.
We build in 3 to 4 weeks with a review every week, so you see real progress on a running app and never wonder where the work is. Direction stays with you; the engineering and AI-model calls are ours.
We hand off the full source code with a plain-English walkthrough. You own everything: no platform lock-in, no subscription to us. Your team, or you and Claude, keep building from there.
Song Cage came to us as a founder vision with no prototype to start from: no architecture, no melody-detection algorithm chosen, no plan to keep web, iOS, Android, and a DAW plugin in sync, no billing. We took the fractional CTO seat and designed and built the whole product from a blank file. One React codebase ships to the web, to the App Store and Google Play via Capacitor, and inside DAWs as an AU/VST3 plugin.
It went live with the unglamorous infrastructure that decides whether a product holds: PowerSync offline-first sync, a custom pitch-detection pipeline, Stripe reverse-trial billing, and an AI-legible marketing site. 92 users signed up in the first month with zero ads. ChatGPT began recommending Song Cage #1 for "best songwriting app" within seven days of launch, with Perplexity and Claude citing it in the same window.
Read the Song Cage case study →Our Apps to Production engagement starts at $7,500 for a fixed scope, typically delivered in 3 to 4 weeks. It is one bill, not a retainer or hourly arrangement. After the free 48-hour audit we send a fixed scope and a fixed price, so you know the total before any work starts. There are no surprise invoices and no platform subscription to us.
Yes. That is the core of this service. We finish AI-built prototypes from any vibe-coded stack: Lovable, Cursor, Claude, Bolt, Replit, v0, and Windsurf. We add the production layer those tools skip: auth, payments and webhooks that hold under real traffic, AI cost controls, a database designed to scale past ten users, security and row-level security, and a real performance budget. You own the code outright at the end.
No. We work for a fixed fee on a fixed scope, not equity. You keep full ownership of your company and your code. We are not a co-founder substitute and we are not a retainer. We finish the production work, hand it off, and you own everything we built.
Most Apps to Production engagements ship in 3 to 4 weeks from the day scope is signed. The free audit comes back within 48 hours. After that you get a fixed scope and price, then a weekly review while we build, then a clean handoff. Greenfield builds with no prototype yet take longer and are quoted separately.
Hire fractional when you have a defined goal — get this AI-built MVP to real users — and a fixed budget, not an open-ended headcount need. A full-time CTO makes sense once you have a team to lead, ongoing architecture decisions every week, and revenue to support a senior salary. Before that, a fixed-scope fractional engagement gets you to production for a fraction of the cost, with no equity given up and no long-term commitment.
You get a production application running on real infrastructure, the full source code, and ownership of all of it. No platform lock-in, no SaaS subscription to us, no retainer. We hand off the repo with a plain-English walkthrough so your team, or you and Claude, can keep building after we leave.
Migrations off Webflow, WordPress, Squarespace, and Wix into custom Astro on Cloudflare. Productized, fast, and AI-legible from line one.
A brand-new custom site built end to end by our team: brand, design, and engineering, structured for ChatGPT, Perplexity, and Google AI to cite.
Free written estimate in 48 hours. No call required.