L-04 · Products
Kalkulačky online
Portal for Czech life situations: 25 calculators, document templates and step-by-step guides.
- Role
- Product, calculation logic, content structure, SEO and operations
- Year
- 2025
- Stack
- Next.js · React · TypeScript · Tailwind CSS
Problem
People need to work out their net salary, self-employed contributions, maternity benefit or pension under the current Czech rules. Official sources are scattered and the formulas change every year.
Solution
The portal has three pillars on one taxonomy: 25 interactive calculators, document templates to download or fill in the browser, and step-by-step guides to life situations. Every calculation keeps its legal source and year in the repository, and tests check completeness.
The site is a static Next.js 15 export with React 19 and TypeScript. It works as a PWA with search and offline mode for visited calculators. It ships as an image through the shared CI templates to the web01 server behind Cloudflare.
Outcome
A fast site with no backend, where a new calculation or a new tax year is one code change that is tested and deployed automatically.
In the 28 days of September 2026, Google search brought over 2,000 visitors to the site and its pages appeared in results more than 90,000 times (Google Search Console). July and August together brought just under 2,000 visits, so September alone outgrew them.