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stackschmiede.de
DE
2025 industry Live

Time-tracking system for small and mid-sized companies

Backend, web dashboard and mobile app (iOS + Android) for legally compliant time tracking. GDPR-compliant, aligned with German working-time law 2026 standards. White-label available — API integration (Crewmeister etc.) or own backend.

Year
2025
Duration
Ongoing
Role
Solo engineer (AI-augmented) — concept, backend, app, web dashboard
Sector
industry
Tech stack
GoPostgreSQLFlutter (iOS + Android)CaddyVPS

What’s this about?

Since the ECJ ruling (2019) and the German BAG ruling (2022), all employers in Germany must systematically record working hours. The amended working-time law (phasing in from 2026) tightens this further: electronic, tamper-proof recording becomes mandatory.

I offer an individually branded time-tracking solution — backend, web dashboard and mobile apps (iOS + Android) — that is GDPR-compliant, hosted in Germany, tamper-safe through a hash-chain audit log, customizable to your corporate identity (whitelabel), and fairly priced (no pay-per-user trap).

What runs today

Backend (Go + Postgres, REST + WebSocket, single-binary). Web dashboard for management (time accounts, leave, reports, monthly close). Mobile apps (Flutter for iOS + Android, offline sync via SQLite). Security: hash-chain audit log — tampering is automatically detectable.

A look at the app

Login screen with mail and password fields and corporate logo
Login · whitelabel branding
Home dashboard with clock-in button, weekly schedule and time account
Home · clock-in, weekly plan, time account
Monthly calendar with workdays, leave, sick and public holidays
Month view · work / leave / holiday
Add-missing-time form with from/to, break and optional note
Back-fill · correct a missed clock-in
Automatic clock-in via geofence with fully-automatic / hybrid mode
Geofence clock-in · auto or hybrid mode
Schedule configuration per weekday with start and end times
Schedule · target hours per weekday

Why Go + Flutter?

  • Go: deploy-simple (single binary), strongly typed — time math is dangerous, Go + sqlc eliminates entire classes of bugs.
  • Flutter: iOS + Android from one codebase — realistic for a small team.

Why interesting for you?

  • Cost brake vs. pay-per-user market leaders — flat licensing scales with features, not users.
  • Branding: your corporate look, not generic stock UI.
  • GDPR gold standard: DE hosting, no US cloud, audit log for inspections.
  • Legally sound basis: aligned with the 2026 amendment of the Arbeitszeitgesetz.

Status

  • Prototype functional with all core features.
  • No live customer in daily use yet — on request a pilot partnership at pilot conditions.
  • Store submission: beta builds ready.

Outcomes

  • Working prototype: backend + web dashboard + app
  • Audit log with hash-chain signature for tamper protection
  • Offline-capable app (SQLite), syncs on connection
  • Whitelabel approach: branded per customer
  • Aligned with the 2026 working-time law amendment and GDPR