One-screen Auftragsstatus-Board for DACH micro physical-services: Kanban (Angebot/Auftrag/Rechnung gesendet/Bezahlt) + shared team calendar + WhatsApp-Bot for status-updates from the field — replaces Excel + paper without the Handwerker-CAD overhead. €15/mo flat, 1-3 team seats included.

What we ship

**Core features (MVP)**

• WhatsApp-bot-first workflow: operator runs everything through WhatsApp ("Auftrag fertig", "Foto", "Rechnung senden") — the app is optional
• Auftragsstatus Kanban (Angebot → Auftrag → in Arbeit → Rechnung gesendet → Bezahlt) + photo upload per job (before/after/Auftragsbeleg)
• Shared team calendar with bidirectional ICS sync (Google / Outlook), color-coded by team member + status
• One-tap "Rechnung senden" → ZUGFeRD PDF auto-generated from Auftrag data → sent to customer via email or WhatsApp
• sevDesk / Papierkram read-only integration: paid-status auto-updates from the bookkeeping tool when Zahlungseingang is detected

**Primary user flow**

1. Operator receives a request (phone / WhatsApp / web) → creates an Auftrag in the app with one swipe, or via WhatsApp message: "neuer Auftrag Müller, Umzug, Sa 14:00"

2. On the day of the job — writes in WhatsApp "Auftrag Müller fertig" + photo; the bot moves the status to "Rechnung gesendet" and generates the ZUGFeRD PDF

3. PDF auto-sends to customer; operator sees the card on the Kanban "Rechnung gesendet" column with photo thumbnails and invoice attached

4. On payment (via sevDesk/Papierkram integration) the card slides to "Bezahlt" — operator gets a WhatsApp notification "Müller hat bezahlt: €450"

**What it looks like**

• **Landing**: "Schluss mit Excel + Zettel — dein Auftragsbuch im WhatsApp". Hero is a phone mockup with a split screen — right side a WhatsApp chat with bot commands, left side a Kanban board auto-updating in real time. Section per Gewerk (Entrümpelung / Reinigung / Umzug / Hausmeister) with screenshots of the same UI with branche-specific statuses. Pricing: €15/Monat flat, 1-3 Plätze inklusive. Trust: "sevDesk + Papierkram-Integration", "WhatsApp Business Cloud (Meta) zertifiziert".
• **Main app (Mobile-first PWA)**: vertical Kanban — 5 columns swipeable horizontally on mobile; each card shows customer name, address, date/time, photo thumbnail (before/after), assigned team member. Tap a card → full-screen detail with photo gallery, address-tap-to-Google-Maps, phone-tap-to-call, "WhatsApp senden" shortcut. Bottom tab bar: Kanban / Kalender / Team / Settings.
• **Output**: ZUGFeRD invoice PDF `Rechnung_2026-042.pdf` with photo Auftragsbeleg attached, WhatsApp message-thread archive per Auftrag (for GoBD defense), CSV export of all Aufträge with status history for the Steuerberater. Weekly "Wochen-Übersicht" WhatsApp message: "Diese Woche: 12 Aufträge erledigt, €3,400 bezahlt, 2 offen".

**MVP build plan** — 12 days

Source signals

• **SIG-20260425-dach-micro-saas-utility-excel-zettel-handwerker** — "macht alles noch mit Excel und Zetteln" + expert reply "sevDesk + Outlook-Kalender + Excel als Gesamtübersicht" (RECURRING)

Reasoning

The single SIG is RECURRING and contains the canonical product-spec quote: a gutefrage.net expert tells the asker that sevDesk closes bookkeeping, but the operator still needs Outlook calendar + master Excel for status (Angebot/Auftrag/Rechnung/Bezahlt). That's a literal product-spec for a thin coordination layer.

The key segmentation insight is that we're NOT competing with HERO/plancraft/OfficeOn — they target Handwerksbetriebe (Maler/Dachdecker/Elektriker) with 5-20 staff, GAEB-Dateiformate, and €30-80/mo pricing. Our TAM is **non-Handwerk physical-service operators** (Entrümpelung/Reinigung/Umzug/Hausmeister) — 5-10x more numerous but ignored by current players. WhatsApp-Bot is the critical UX wedge: operators in the field already use WhatsApp with customers and staff; status updates via bot ("Auftrag fertig") feel natural vs logging into an app. Stack-fit is clean for 12-day solo build (Cloudflare Pages + Railway + FastAPI + Postgres + WhatsApp Business API + Stripe SEPA + Claude for intent recognition).

Quick competitive read

5 profiled competitors (CMP files):

• **HERO Software** — €39-129/mo per user, heavy Handwerker-CAD, GAEB; wrong audience.
• **plancraft** — €29-49/mo per user, modern Handwerker challenger, drift toward general-Handwerk; potential future expansion threat.
• **Craftboxx** — €19-49/mo per user, closest pricing but still Handwerker-target; we differentiate via Gewerk-UX + WhatsApp-bot.
• **Papierkram** — €0/€8/€16, bookkeeping-only; complementary, integration target.
• **MeisterTask** — €13.50 Pro per user, generic Kanban; we have opinionated Auftragsstatus template.

Market density: **medium-high (6 thick players upmarket)** but **white-space at non-Handwerk physical-service micro-team coordination layer with WhatsApp-bot**. No competitor specifically targets Entrümpelung/Reinigung/Hausmeister micro-teams. Competitive_pressure: 6 (medium).

Initial pricing hypothesis

€0 free (1 user, 10 active orders) → €15/mo Solo (unlimited orders, WhatsApp-bot, ICS calendar) → €29/mo Team (3 seats, sevDesk/Papierkram integration, branded WhatsApp). Below the Handwerker €30-80 band, with 1-3 seats included vs per-seat — strong pricing wedge for micro-teams.

Distribution hypothesis

Programmatic SEO per Gewerk landing pages ("Software für Hausmeisterservice", "Auftragsverwaltung Entrümpelung") + Facebook DACH branche-groups (Reinigungskräfte, Entrümpelung Berlin) + gutefrage.net answer-marketing + WhatsApp-native referral chain (operators know each other in their city).