Custom web app development for small businesses

I am an independent developer from Poland. Your business runs on spreadsheets, emails and notes, and off-the-shelf tools force you to fit your work around them instead of the other way round? I build custom web applications that do exactly what you need. They run in the browser, on desktop and on mobile, with nothing to install. Simple internal tools and MVPs start from PLN 5000, and the first call is free.
Free quote tel +48 531 919 066

When a spreadsheet is no longer enough

Several people edit the same file, someone overwrites data, nobody knows which version is current, and the monthly report takes a whole day. That is usually the point where a simple app with user accounts pays for itself faster than you would expect. Everyone sees what they should, data lives in one place and reports generate themselves.

What I can build

Off-the-shelf tool or custom app?

If there is a ready-made tool that fits most of your work, I will probably recommend it, because it will be cheaper. A custom app makes sense when you pay for several subscriptions at once, the existing tool forces awkward workarounds, or your process is specific enough that nothing handles it well.

Hire a Polish developer directly

Many companies hire developers in Poland for a good balance of quality and cost. Working with me, you get that without a software development company in between: you talk directly to the person who writes the code, in English, and pay for development rather than account management. I work remotely in the Central European time zone, which overlaps well with the UK, the rest of Europe and the US East Coast mornings.

Tech stack

I build the backend and admin panel in Python and Django, with an API for mobile apps or other systems. The interface works in the browser and on mobile, also as a PWA that can be added to the home screen without an app store. I connect apps with payments, email marketing and invoicing, and host them on servers in the EU.

How much does a custom web app cost?

To start

MVP or internal tool
from PLN 5000
The first version with the key features.
  • User accounts and basic roles
  • One core process, e.g. orders or tickets
  • Deployment and a short user guide
App with integrations
from PLN 12 000
Advanced roles, reports and connections with other systems.
  • Payments, invoicing and email integrations
  • Client portal or API for a mobile app
  • Work split into stages
Maintenance and development
monthly plan or hourly
After launch.
  • Updates, backups, monitoring
  • New features as you need them
  • Quick response when something goes wrong

Every project is quoted after a call. Larger ones are split into stages so you can start using the first version as soon as possible.

How we work together

  1. Free call – you tell me how your work looks today and what takes the most time.
  2. Scope and quote – you get a description of the first version, a timeline and a price.
  3. Build in stages – I show progress every few days and you can try a working test version.
  4. Launch and growth – I launch the app, hand over a guide and keep developing it if you need.

Frequently asked questions

Will the app work on mobile?

Yes. It runs in the mobile browser and, as a PWA, can be added to the home screen like a regular app. A Google Play version is possible as a separate stage.

Do I own the code and data?

Yes. You get the full code in a repository and access to the server, and the data belongs to you.

What if we stop working together?

I hand over the code, documentation and access, so another developer can take over without guesswork.

How long does MVP development take?

Usually around 4-8 weeks, depending on scope. You will get a more precise timeline with the quote.

Why hire a Polish developer instead of an agency?

You get direct contact with the developer, lower overhead and EU-based data handling. For small and mid-sized projects this is usually faster and cheaper than a software house.

Can I start small?

Yes, and that is usually the best start. A small version quickly shows what is really needed and what can wait.

Does it have to be a separate app rather than WordPress?

Not always. If your needs fit in WordPress, a custom plugin or integration will be cheaper. I will tell you which makes sense.

Related services

To extend an existing website or store, see custom WordPress plugin and WooCommerce development. For a new website, see WordPress website development.

Tell me how you work today.

A few sentences about what you do in spreadsheets and emails and what takes the most time are enough. I will tell you whether an app makes sense and roughly what it would cost.

Telefon531 919 066
WhatsApp+48 531 919 066
E-mailhello@karolnowak.com
GodzinyPn-Pt, 9:00-18:00