Our products

Software we build and run ourselves

Besides client projects, we develop and maintain our own online services, used every day by schools, organizations and developers.

Składka

Web app · PWA

Group money collections, without the effort

From a single class fee to a whole school's parent council budget. Składka keeps track of who has paid, reminds about deadlines and keeps a transparent record of expenses — no spreadsheets or group chat messages.

  • Completely free — no fees, no ads
  • Categories, e.g. classes or sections
  • Invitations via link or QR code
  • Automatic payment reminders
  • Expense tracking with receipt photos
  • Data export to Excel
Visitskladka.app Free, no fees, no ads

Under the hood

  • Progressive Web App (PWA): installs on a phone like a native app.
  • Reminders and e-mails are sent by background jobs through a RabbitMQ queue.
  • Receipt photos are stored in S3-compatible object storage.
  • Sign-in with e-mail or a Google account, sessions in secure httpOnly cookies.
TypeScriptNext.jsReactTailwind CSSNode.jsExpressPrismaPostgreSQLRabbitMQMinIO (S3)DockerNginx

IsValid

REST API for developers

Validate 76+ data formats with a single API

One consistent API for validating financial, business and general-purpose data. Beyond a yes/no answer it returns extra details such as the bank name, BIC code or card network.

  • 76+ validators in one API
  • IBAN for 80+ countries, VAT for all 27 EU states
  • GLEIF entity data for LEI codes
  • DNS verification for emails and domains
  • SDKs for Node.js/TypeScript and Python
  • WordPress plugin
Visitisvalid.dev Free plan: 100 requests per day

Under the hood

  • Microservice architecture: over a dozen independent services running in containers.
  • Reference data is refreshed automatically from official sources: GLEIF, ESMA FIRDS, GeoNames, UN/LOCODE.
  • The API runs as multiple instances behind an Nginx load balancer.
  • Separate user dashboard (API keys, usage statistics) and admin panel.
TypeScriptNode.jsFastifyNext.jsReactTailwind CSSPostgreSQLRabbitMQDockerNginxPython (SDK)PHP (WordPress)

Need a product like this?

We build web applications and APIs for clients too — from the idea to running in production.

Contact us