Connecting your digital threads
Got an idea? We build it.
Knot Systems is a software studio that turns real problems into working software — web apps, mobile apps, and the integrations that tie them together.
Our products are the proof ↓
Work
What we've shipped
Five products across five different domains. Each one started as a real problem that needed a real solution.
KnotOffice
LiveShopify · Web app
A back-office layer for Shopify POS operators who need real financial reporting and QuickBooks reconciliation — built on a proper event-based ledger, not Shopify's.
Shopify GraphQL · Multi-tenant · Laravel
knotoffice.com →KnotBoating
App StoreiOS · Web
Vessel management for boaters who take ownership seriously. Native SwiftUI iOS app, offline-first, sharing a REST API with the web platform.
SwiftUI · Laravel API · AWS
knotboating.com →KnotSync
LiveIntegrations · Web app
Middleware that connects Erply to QuickBooks, ShipStation, Square, and Sellbrite — multi-tenant, scheduled, with a full double-entry journal entry pipeline.
Multi-tenant · QuickBooks API · Sentry
sync.knotsystems.com →MooringOps
BetaWeb · Marine
GPS-mapped mooring management for harbor authorities, installers, and cove masters — with role-based access and a battle-tested CSV import system for real harbor data.
Mapbox GL · Laravel · Multi-role
mooringops.com →Task Overflow
Coming soon · FreemacOS · Developer tool
A task manager built for AI-assisted dev workflows. Runs a local REST API so tools like Claude Code can create and complete tasks directly from your coding environment.
SwiftUI · MCP protocol · NWListener
knotsystems.com/task-overflowWhat we build
The kinds of problems we solve
If it involves moving data between platforms, building a tool someone actually needs, or shipping an app — we've done it.
API integrations & middleware
Scheduled sync pipelines, webhook handlers, ledger transformations, and multi-tenant middleware that keeps data flowing reliably between platforms.
Web applications
Custom web apps built on Laravel, MySQL, and Tailwind — from operational back-office tools to multi-role SaaS platforms. Built to last.
Mobile apps
Native iOS apps in SwiftUI, offline-first where it matters, sharing an API with the web platform. If it needs to be on a phone, we can build it.
About
About Knot Systems
Knot Systems is Don Parkinson, a software developer with 30 years of experience building things that work. I started Knot Systems because I love solving problems — the kind where someone has a real operational headache and the right piece of software would fix it.
The products on this page aren't a side project. They're what I do. Each one came from a genuine problem, got built properly, and is running in production. When you hire Knot Systems, you're working directly with the person who built all of this — no account managers, no hand-offs.
Based on Cape Cod, MA · Building in public
Contact
Have a project in mind?
Tell me what you're trying to build. I'll tell you honestly whether I can help.
Got it — I'll be in touch soon.