Hiring an AI Development Partner: Four Questions, Answered
Who integrates an LLM into an existing product, adds document search or a chatbot to SaaS, or builds an AI first version with no engineers.
2026-09-29
Digital Product Agency
We Build Apps You'll Love
UI/UX design, mobile apps, and web platforms - from concept to launch.
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Works
Recent Works
Four products we designed and built end to end. Each case study lists the challenge, the technology stack, the project team and the outcome.
services
We provide
AI App Development
We build AI-powered applications, including chatbots, intelligent assistants, and ML-driven features.
Web Development
We build fast, scalable web applications with React, Next.js, and Node.js. From MVPs to enterprise platforms.
Mobile App Development
We build high-performance native and cross-platform mobile apps for iOS and Android, focused on scalability.
UI/UX Design
We create intuitive, beautiful interfaces backed by user research and modern design principles.
start with us
Tell us what you want to build
A 30-minute call, then a written scope with hours, a timeline and a budget range. No payment and no commitment at that stage.
Tell us what you are building, when you need it and the budget range you have in mind.
Kultrix in facts
Kultrix is a product team in Lviv, Ukraine, building web and mobile products for clients worldwide. Each fact below links to the page that shows it.
Who we are
Kultrix was founded in 2023 and works from Lviv, Ukraine. Design, development, QA and project management sit in one team.
How we work
Clients talk directly to the team that designs and builds the product and see a demo of the working result every week. The code belongs to the client from the first day, and the repositories and cloud accounts are on the client's side. A client can end the contract after each stage of the project.
More on the about page: How to check Kultrix before you hire.
What we build
Mobile
- Mobile App Development: iOS and Android apps: React Native from one codebase, native Swift or Kotlin where a shared client cannot reach.
- React Native Development: One codebase for both platforms. Fitblast is built this way and is live on the App Store and Google Play.
- iOS Development: Native Swift and SwiftUI for iPhone and iPad, App Review included. Our public iOS case, Fitblast, is a React Native app taken through TestFlight and App Review to the App Store.
AI
- AI Integration: AI added to an existing product with LLM APIs, RAG pipelines and vector databases.
- AI App Development: Chatbots, assistants and ML features on OpenAI, Claude and LangChain, from prototype to production. Fitblast builds workout plans with OpenAI language models and LangChain pipelines.
UI/UX
- UI/UX Design: User research, interaction design and interactive prototypes. On Fitblast one team went from research and UI design to the App Store and Google Play.
- Design Systems: Shared Figma variables for colors and fonts, exported to JSON and synced into the code, as on Fitblast.
Web
- Web Development: Web applications on React, Next.js and Node.js, from MVPs to enterprise platforms. Case studies: Nexora and CPortal.
- NextJS Development: Next.js with App Router, SSR, ISR and Vercel deployment. CPortal runs on a React/Next.js front end.
- SaaS Development: Multi-tenant platforms with billing, team workspaces and role-based access. CPortal is multi-tenant, so a second municipality is configuration rather than a second build.
MVP
- MVP Development: From idea to a launched product in typically 9-16 weeks. The Fitblast and Scratch Cards MVPs were delivered in 3 months.
Work you can check
- Fitblast: AI fitness app. On the App Store since October 28, 2025 and live on Google Play. The MVP was delivered in 3 months.
- Scratch Cards: Web3 lottery platform. The MVP was delivered in 3 months.
- Nexora: Project budget platform for operations teams: a React workspace on a Python (FastAPI) and PostgreSQL back end, with risk flags shown next to the budget they affect.
- CPortal: Municipal service portal on React/Next.js, Node.js and PostgreSQL. It is multi-tenant, so a second municipality is configuration rather than a second build.
All four case studies list the challenge, the technology stack, the project team and the outcome on the works page.
How a project starts
A project starts with a 30-minute call, then you get a written scope with hours, a timeline and a budget range. There is no payment and no commitment at that stage. Ask for the call on the contact page. The public cost calculator shows hours and weeks for each module.
Where to check us
Listings on independent directories and platforms are on the about page.
testimonials
Success stories
Read what our clients say about partnering with us for successful design and development.
What impressed us most was how Kultrix handled the full stack - frontend, backend, and mobile - with one cohesive team. Communication was clear, delivery was predictable, and the final product exceeded what we initially scoped.
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Frank W.
Kultrix built both our web platform and mobile app from scratch. Their team understood the complexity of our industrial workflows and translated them into clean, intuitive interfaces. We launched on time and our operators adopted the tools immediately.
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Dinant V.
Kultrix handled everything for us - landing page, dashboard, mobile app, and even a Chrome extension. Having one team own the entire product surface meant everything felt connected and consistent. They shipped fast and the quality speaks for itself.
T
Timur G.
Kultrix has been our go-to partner for multiple projects - from marketing websites to full mobile applications and backend systems. They scale up when we need speed and maintain consistency across every project. Reliable, fast, and technically strong.
M
Musa S.
Working with Kultrix on our mobile app and backend was seamless. They brought strong product thinking to every sprint, not just code. When priorities shifted, they adapted quickly without losing momentum. Exactly the kind of partner a product team needs.
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Taj S.
We needed a team that could handle mobile development, server infrastructure, and AI features all at once. Kultrix delivered on all three fronts. Our fitness platform went from concept to production in under four months with zero compromises on quality.
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Laurent D.
Kultrix developed our mobile app and the entire backend infrastructure. They took ownership of the architecture decisions early on, which saved us months of rework. The app runs smoothly and our users love the experience.
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Taras L.
We have been working with Kultrix for years now, from software development to ongoing design work. They consistently deliver quality and understand our product deeply. It feels like an extension of our own team rather than an external partner.
M
Marlon M.
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FAQ
Frequently Asked Questions
Absolutely. Most of our clients come to us with a concept, not a spec. We run a discovery phase where we help you define the scope, features, and user flows. You focus on the business vision, we handle the technical side from day one. You can describe the idea in your own words at kultrix.com/contact.
It depends on scope, so we publish the rate and the hours behind it instead of one number. Ongoing support, infrastructure and third-party licences are quoted separately, and the module-by-module breakdown for your own scope is at kultrix.com/cost-calculator.
A mobile MVP runs 9-16 weeks, a web SaaS with integrations and a second language 9-17 weeks, and a full platform across mobile and web 20-40 weeks. You see working builds every two weeks, not one reveal at the end. The week count for your own scope comes out of the first call, which you ask for at kultrix.com/contact.
Kultrix is a product team in Lviv, Ukraine, building web and mobile products for clients worldwide.
Yes, 100%. Once the project is paid for, you own everything: source code, designs, assets, accounts. No lock-in, no licensing fees. You can take it to any developer if you ever want to.
Yes. If you have Figma files or a prototype ready, we can skip the design phase and go straight to development. We will review the designs for technical feasibility and flag anything that might cause issues on real devices. Send the Figma link at kultrix.com/contact and the feasibility review comes back before anything is agreed.
It happens on every project and we plan for it. We work in 2-week sprints, so you can reprioritize features at the start of each sprint. Major scope changes may affect timeline and budget, but we will always discuss that transparently before proceeding.
Yes. We specialize in React Native, which lets us build one codebase that runs natively on both platforms. You get the quality of a native app without paying to build it twice.
Just your idea and 30 minutes for a call. We will walk through your concept, ask the right questions, and follow up with a rough scope and estimate within a few days. No payment, no commitment at that stage. You ask for that call at kultrix.com/contact.