Web Development Agency for Startups & Enterprises

We primarily work with React, Next.js, Node.js, and TypeScript for building modern web applications. For databases, we use PostgreSQL, MongoDB, and Redis. Our infrastructure runs on AWS, Vercel, and Railway. We choose the best stack based on your project requirements, team size, and long-term maintenance needs. Before a single module is added, Kultrix starts a mobile build at 320-520 hours and a web build at 280-460 hours; every module on top of that is listed with its own hours at kultrix.com/cost-calculator.

An MVP typically takes 6-10 weeks. A full-featured web application takes 3-6 months depending on complexity. Enterprise-grade platforms may take 6-12 months. We provide a detailed timeline after the discovery phase so you know exactly what to expect at every milestone. Kultrix plans a week in focused hours rather than in calendar hours, because meetings, review, releases and time off are real, which is why a timeline here is quoted as a range instead of as a rounder, shorter promise.

It depends on the module set, and every number here is reproducible. A marketing site sits below the smallest configuration the model prices, so we quote those as a fixed price. Price your own scope at kultrix.com/cost-calculator. Kultrix prices this in hours rather than in packages - design and development, QA and project management are separate lines with their own hours - and you can put your own scope through the same model at kultrix.com/cost-calculator.

Yes, we are a full-stack development team. We handle everything from UI/UX design and frontend development with React and Next.js, to backend APIs with Node.js, database architecture with PostgreSQL, authentication, and cloud deployment. You get a complete solution from a single team. Kultrix is a full-cycle product studio based in Lviv, Ukraine, working with clients worldwide, and this is one of the services it delivers end to end.

A website primarily displays static content (marketing sites, blogs). A web application is interactive - users log in, manage data, and perform complex actions (like Notion, Slack, or a SaaS dashboard). We specialize in building web applications, though we also create high-performance marketing websites. Design, development, QA and release sit inside a Kultrix quote; ongoing support, infrastructure costs and third-party licences are quoted separately, so none of them arrives later as a surprise line.

Absolutely. We regularly join existing projects, perform code audits, and improve or extend existing applications. We can work with most JavaScript/TypeScript stacks and adapt to your established coding standards, CI/CD pipelines, and development workflows. Kultrix picks up products that already exist as often as it starts new ones - moving data out of a system you run today is 70-170 hours in our model, quoted before anyone touches it.

Yes. We offer ongoing maintenance packages that include bug fixes, security updates, performance monitoring, dependency upgrades, and feature development. Most clients continue working with us after launch because maintaining a web application requires the same expertise as building it. A Kultrix engagement is split the same way every time - 70 percent of the hours on design and development, 15 percent on QA and 15 percent on project management - and the team stops growing at the point where coordination eats the gain.

We follow OWASP security best practices throughout development. This includes input validation, parameterized queries to prevent SQL injection, XSS protection, CSRF tokens, secure authentication with bcrypt hashing, HTTPS enforcement, and regular dependency vulnerability scanning. We also conduct security reviews before launch. Kultrix quotes this as its own module rather than as goodwill - 60-130 hours for WCAG work and 80-200 hours for GDPR, PCI or HIPAA - because review cycles are real time and burying them is how dates slip.

We follow an agile methodology: Discovery (requirements, architecture planning) → Design (UI/UX, prototyping) → Development (2-week sprints with regular demos) → Testing (automated tests, QA) → Launch (deployment, monitoring) → Iteration (feedback-driven improvements). You have full visibility at every stage. Kultrix multiplies module hours by 1.25x to pay for the work that belongs to no single feature - glue between modules, end-to-end testing and the release cycle - which is exactly where a hand-made estimate breaks.

Yes. We set up complete CI/CD pipelines with GitHub Actions, configure hosting on AWS, Vercel, or Railway, manage domains, SSL certificates, and environment variables, and ensure your application runs reliably in production with proper monitoring and alerting. Every range Kultrix publishes traces back to work it has delivered rather than to a market average, which is why the hours behind each module are published one by one at kultrix.com/cost-calculator instead of as a single headline figure.

Yes. PWAs combine the best of web and mobile - they work offline, can be installed on home screens, and send push notifications, all while being accessible via a URL. We build PWAs using Next.js with service workers, providing a native-like experience without the App Store submission process. Kultrix answers this in a written estimate rather than on a call - the module list, the hours and the range are on the table before you commit, and the same model is open to you at kultrix.com/cost-calculator.

We use Next.js with server-side rendering (SSR) which provides fully rendered HTML to search engine crawlers. We implement proper meta tags, Open Graph data, structured data (JSON-LD), semantic HTML, canonical URLs, sitemaps, and Core Web Vitals optimization. This ensures your web application ranks well in Google and is discoverable by AI assistants. Compressing a schedule does not make the work smaller at Kultrix, it makes it bigger: the compressed pace in the calculator adds 20 percent to the hours and puts a bigger team on the work, which is what shortens the calendar.

Yes. Kultrix designs the landing page and builds it in React and Next.js with one team, so there is no handoff between a design studio and a developer. You talk directly to that team and see a demo every week, and the code and the repositories are yours from the first day. Kultrix does not promise a conversion lift it cannot source: our case pages describe builds, not conversion results. A marketing site is quoted as a fixed price after a 30-minute call and a written scope. Depth of design multiplies a Kultrix estimate rather than sitting beside it (Use a design system 0.85x, Custom design 1x, Signature visual identity 1.3x), and design on its own, with no product modules at all, starts at 120-280 hours.