Mikita ByshniouPolski

SaaS app · PWA

Invocora — estimates and KSeF invoices from your phone

An app for building crews and tradespeople: the estimate is ready on site, the client approves it online, and the invoice goes to KSeF in one tap.

Year
2026
Timeline
~7 weeks
Type
SaaS · PWA
Role
Full cycle
Market
Poland
Invocora — estimates and KSeF invoices from your phone

invocora.com

Problem

Tradespeople write estimates on paper, in a text message or at night in Excel. They get the VAT rates wrong (23%, 8% or none), and the estimate gets lost in the chat with the client.

From 2026, invoices to companies in Poland are issued through the state KSeF system — so a tradesperson also needs a separate invoicing program.

Solution

  • Estimate on site from your own price list: discount, VAT, equipment minimum order, photos, number, validity date, company logo.
  • The client gets a link and opens the estimate without signing up, in Polish or English — accepts it by entering their name, or declines; the tradesperson gets an e-mail.
  • PDF and a QR code to pay by transfer in a banking app.
  • From an accepted estimate, an invoice in KSeF in one tap, with status by stage — including corrective invoices and invoices for foreign companies.
  • Works offline: changes wait on the phone and send themselves.
  • A ready starter price list for 29 trades.
  • Interface in 4 languages (PL, EN, UK, RU); the client's document is always in the country's language.

Subscription model: 30 days free, then 39 zł/mo, 199 zł for six months or 390 zł a year.

Screens

Estimate editor from your own price list
Estimate editor from your own price list
Totals: discount, VAT, amount
Totals: discount, VAT, amount
Estimate as a finished document
Estimate as a finished document
Client page: QR code and acceptance
Client page: QR code and acceptance
Starter price list for 29 trades
Starter price list for 29 trades

What the project included

  • Tradesperson app: estimates, invoices, clients, price list, subscription
  • Client-facing estimate page
  • Website in 4 languages: SEO, pricing, FAQ
  • Stripe payments (BLIK, Przelewy24, card): 30 days free, then subscription
  • Password or Google sign-in, e-mail code confirmation
  • Help and support form in 4 languages
  • Owner dashboard: sign-ups, activity, subscriptions, revenue
  • Privacy policy and terms in 4 languages

Tech stack

  • Next.js 15
  • React 19
  • TypeScript
  • Prisma
  • MySQL / MariaDB
  • PWA — service worker, offline queue
  • Stripe
  • Resend
  • Google sign-in
  • KSeF 2.0 — XML FA(3)
  • Vitest
  • Playwright + axe
  • GitHub Actions
  • Hostinger

By the numbers

~2000
automated tests
~110k
lines of code
74
API endpoints
39
screens
26
DB migrations
4
UI languages
See: mobile apps
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