Web Application Development | POLPROG Skip to content

Web Application Development

Modern, performant web applications built with TypeScript, PHP and proven frameworks. From SPAs to full-stack platforms, optimised for speed and SEO.

What We Do

Fast, accessible web applications that users love

The web is the most accessible platform on earth. A well-built web application reaches every device, every operating system, every user without app store gatekeepers. We build web apps that load fast, rank well and convert visitors into customers.

We deliver production-grade web applications with client-side routing, internationalisation, Service Worker caching, structured data and Lighthouse CI checks enforcing high standards across performance, accessibility, best practices and SEO.

Whether you need a lightweight marketing site, a complex internal tool or a full SaaS platform, we architect for performance from day one. Modern CSS, lazy-loaded assets, edge caching and progressive enhancement are foundations, not afterthoughts.

Web Application Development

Production-grade web applications with Lighthouse scores consistently above 90 across performance, accessibility and SEO. Every project receives the same attention to quality and detail.

Proven web delivery track record

When to choose a web application

You want maximum reach without app store dependencies

SEO and organic reach are important to your business

Your users need instant access from any device

You're building an internal tool, dashboard or SaaS product

22
Languages supported
29+
Projects delivered
PWA
Progressive Web App
How we work

Our delivery process

  1. Planning

    Sitemap, wireframes, performance budget

  2. Design

    Responsive UI, design system, accessibility

  3. Build

    Component-driven development, testing

  4. Optimise & Ship

    Core Web Vitals, CDN, monitoring

Technology

Tech stack we use

TypeScript
React
PHP
HTML5 / CSS3
Service Workers
Webpack
Lighthouse
SEO
REST API
i18n
Questions

Frequently asked questions

What kind of web apps do you build?

Everything from lightweight marketing sites to complex SaaS platforms, admin dashboards and internal tools. Each project gets a tailored architecture.

Will my web app work offline?

If needed, yes. We implement Service Workers and progressive enhancement so your app remains functional even without connectivity.

How do you ensure performance?

Performance is a first-class concern from day one. We set Lighthouse budgets, optimise Core Web Vitals and monitor real-user metrics post-launch.

Can you handle multilingual sites?

Yes. We have extensive i18n experience across 22+ languages, including RTL support. This very website supports that many languages.

Portfolio

Example Completed Projects

native-ui.com - the official site for the Native-UI design system

Native-UI

Website
v1.0.0

The official home of the Native-UI design system - docs, components, and changelog.

Next.js React TypeScript Tailwind CSS Docker
SDK Documentation Component Catalogue Theming Guide
anna-skrzynska.pl - Anna Skrzyńska portfolio
v1.0.0

Portfolio of visual designer Anna Skrzyńska - brand identity, web design, photography, painting, and interior concepts.

HTML CSS JavaScript
Visual Portfolio Brand Identity Photography & Painting
Chmiel Glassworks
v1.0.0

Modern responsive website for a family-run glass workshop. Service pages, photo gallery and contact form.

HTML CSS JavaScript
Service Catalog Photo Gallery Contact Form
Day4Dream - ambient music project

Day4Dream

Website
v1.0.0

Personal ambient music project website - minimalist design, full discography, ambient player, bilingual.

Next.js React TypeScript Tailwind CSS Docker
Music Player Full Discography Bilingual
Knowledge Base

Related Articles

WebP vs AVIF vs JPEG vs PNG: Which Image Format Should You Use and How Can You Reduce File Size?
23 Jul 202614 min read

WebP vs AVIF vs JPEG vs PNG: Which Image Format Should You Use and How Can You Reduce File Size?

Image format still matters. A 1.8 MB hero photograph can be the main cause of poor LCP, while a lossless PNG used for photographic content can be many times heavier than a carefully encoded WebP or AVIF file. On the other hand, aggressively converting every asset to the newest format can reduce text sharpness, increase build cost or cause problems in older clients and external publishing systems.

Read article
A split-screen design system comparison: on the left a polished enterprise MUI component library with prebuilt controls, on the right editable shadcn/ui component blocks owned and tuned by the product team.
15 May 20269 min read

MUI vs shadcn/ui: Which UI Library Should You Choose?

MUI is one of the most familiar React UI libraries in corporate environments because it offers ready-made components, strong documentation, and a mature ecosystem. shadcn/ui takes a different approach: instead of installing a black-box component library, you copy accessible components into your codebase and own them outright. The choice is not just about UI style. It is about speed, customization, cost, and long-term control over your design system.

Read article
Abstract technical comparison showing a ready-made enterprise MUI X Data Grid on one side and a headless TanStack Table engine wired to custom UI blocks on the other.
14 May 20269 min read

MUI X Data Grid vs TanStack Table: Which Is Better?

MUI X Data Grid is attractive for teams already using Material UI because it provides a ready-made data grid experience with advanced commercial features. TanStack Table is a headless table engine that gives teams full control over markup, styling, and behavior without forcing a specific UI. The best choice depends on whether your team wants a packaged enterprise grid or a flexible table foundation you can shape around your product.

Read article

Ready to launch your web application?

Let's discuss your requirements and create something exceptional.

Contact Us