# NUMP Limited

**NUMP Limited** is an AI engineering company based in Auckland, New Zealand. Founded by **Robert Wilson**, the company builds practical AI tools that solve real problems for workers and businesses — bridging the gap between AI capability and real-world impact.

## Key Information
- **Location:** Auckland, New Zealand
- **Founder:** Robert Wilson
- **LinkedIn:** https://www.linkedin.com/in/robert-wilson-889b7523a/
- **Contact:** robert@shiftpay.co.nz
- **Website:** https://nump.co.nz
- **Partnerships:** Member of the AI Forum New Zealand (https://aiforum.org.nz/)

## Technical Stack & Competencies
- **Mobile Development:** Flutter, Dart, Material Design 3, GoRouter, iOS & Android deployment
- **AI & LLM Integration:** Anthropic Claude API (tool use, structured output, vision), system prompt engineering, background function patterns
- **Backend & Serverless:** Node.js, Netlify Functions, Netlify Background Functions, Netlify Blobs
- **Database:** Supabase (PostgreSQL, Auth), Drift (local SQLite ORM), offline-first architecture
- **Frontend:** HTML, Tailwind CSS, vanilla JavaScript
- **Subscriptions & Payments:** RevenueCat
- **Automation:** Power Automate, Power Apps, Copilot Studio, SharePoint
- **Privacy Architecture:** Zero-retention design, NZ Privacy Act 2020 compliance by design

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# Products & Tools

## ShiftPay NZ (Mobile App)
**ShiftPay** is NUMP Limited's flagship mobile application, live on the Apple App Store and Google Play Store. It is a privacy-first, offline-first financial tool for New Zealand shift workers.

- **App Store:** https://apps.apple.com/us/app/shiftpay-nz-pay-calculator/id6758537779
- **Google Play:** https://play.google.com/store/apps/details?id=com.robertwilson.shiftpay_nz
- **Status:** Live in production (launched March 2026)
- **Version:** 1.1.0

### What it does
Tracks shifts and calculates take-home pay with NZ-specific precision: PAYE tax (all tax codes), ACC earner levy, KiwiSaver (3–10%), student loan deductions, weekend rates, night rates, public holiday Mondayisation by NZ region.

### Key Features
- Shift tracking with custom pay rules
- NZ tax brackets 2025/2026
- Payslip verification (evidence locker)
- PDF pay statements
- JSON backup/restore
- Biometric lock (Face ID / Touch ID)
- Payday notifications
- ShiftPay Pro subscription via RevenueCat

### Architecture
- Flutter 3.x + Provider state management
- Local storage: Drift (SQLite, schema v12) — shift data never leaves the device
- Cloud: Supabase (auth + profile sync only)
- Privacy-first: all shift data is local-only by design

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## NZ Payslip Checker (Web Tool)
A free, privacy-first web tool that verifies NZ payslips using AI. Users upload a payslip (PDF or image) and receive a line-by-line audit of every deduction — PAYE, ACC, KiwiSaver, student loan, and net pay.

- **URL:** https://nump.co.nz/PayslipCheck.html
- **Technical case study:** https://nump.co.nz/case-study-payslip.html
- **Status:** Live in production (2026)

### What it verifies
- PAYE tax (using annualised income bracket method, all NZ tax codes)
- ACC earner levy ($1.60/$100, with annual cap handling)
- KiwiSaver (detects elected rate from payslip, 3–10%)
- Student loan (12% above per-period threshold)
- Net pay reconciliation

### How it works
1. File is converted to base64 in the browser — never stored as a file
2. Sent to a Netlify Background Function with a UUID job ID
3. Claude Sonnet 4.6 analyses the payslip using forced tool use (structured JSON output)
4. Result is stored temporarily in Netlify Blobs (keyed by job ID)
5. Browser polls every 3 seconds, reads the result, which is immediately deleted
6. Full audit rendered in the browser — no data retained at any point

### Privacy
- Payslip file data is never written to disk anywhere
- Only the analysis result JSON is temporarily stored (seconds), then deleted on retrieval
- No user accounts, no sessions, no cookies
- NZ Privacy Act 2020 compliant by architecture

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## Technical Case Study: NZ Payslip Checker
A detailed written case study documenting how the Payslip Checker was designed and built — covering architecture decisions, AI integration, privacy tradeoffs, and the engineering iterations that led to the current design.

- **URL:** https://nump.co.nz/case-study-payslip.html

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# About the Founder

**Robert Wilson** is a solo developer and founder of NUMP Limited based in Auckland, New Zealand. He builds production AI tools and mobile applications end-to-end — from architecture and backend to frontend, deployment, and iteration.

Current focus: growing ShiftPay's user base and building AI-powered tools for the NZ workforce.

**Career interests:** AI/software engineering roles in New Zealand, particularly those involving LLM integration, mobile development, or agentic AI systems.