I design and build operational software, integrations and automation through SM Systems.
I take on scoped business projects and agency subcontracting, covering implementation, testing and handover. My work spans custom software, customer-facing websites, CRM and support systems, cloud services, and connected RFID/edge systems. Ongoing work can cover improvements, integrations and an agreed delivery backlog.
My main tools are Python, TypeScript, C#/.NET, FastAPI, PostgreSQL and AWS, alongside Zendesk, Jira, HubSpot, Airtable, Make and n8n.
For a project or agency subcontract, email stefan@smsystems.au with what exists, what needs to work better and your timeframe.
Client systems implementation connecting customer accounts, per-vehicle subscriptions, local RFID access decisions and operator controls. I designed and implemented the application, cloud and edge integration. Stripe remains in sandbox and staged physical commissioning remains. The public repository contains architecture and a reference model; client source stays private.
.NET PostgreSQL AWS SQLite RFID OPC UA
Live paid-client website for a Geelong residential builder. I handled discovery, content, design, implementation and launch, including responsive project content, direct contact paths and structured quote intake. Visit the client site.
HTML CSS JavaScript n8n
SM Systems' own enquiry and measurement implementation connecting the website, GTM/GA4, HubSpot, Airtable and Make. I built the shared submission reference, human qualification controls and Playwright checks, including a retained duplicate-event regression.
Playwright GTM GA4 HubSpot Airtable Make
Internal opportunity and delivery system for approved intake, duplicate control, exceptions and accepted project handoff. My work covers the data model, routing controls and operator workflow; the connected router was returned to inactive after testing.
Airtable Make JSON contracts
Local reference implementation for validating events, mapping fields and preventing duplicate downstream operations. I built the FastAPI service, audit/dead-letter controls, tests and operating documentation. Its supplied scenarios use local provider-shaped contracts.
Python FastAPI OpenAPI pytest
Internal support system with grounded retrieval, cited private suggestions, human approval and a verified Zendesk-to-Jira handoff. My work spans discovery, backend, evaluation, frontend and AWS delivery. Controlled AWS commissioning is documented; the temporary runtime was decommissioned after closeout.
Python FastAPI React PostgreSQL AWS Bedrock Zendesk Jira
| Project | Focus |
|---|---|
| HubSpot Lead-to-Deal CRM | Linked company, contact and deal records with a seven-stage operating pipeline and idempotent lifecycle controls. |
| HubSpot to Zendesk Customer Handoff | Approval-gated CRM-to-support mapping, stable external IDs and provider readback using controlled commissioning records. |
| n8n Service Lead Routing | Importable 20-node workflow covering accepted, duplicate, invalid, review and integration-exception outcomes. |
| Airtable Coaching Program Delivery Hub | Linked participants, coaching plans and sessions with owner and role-specific Airtable Interfaces. |
| Zendesk to Jira Support Escalation | Guarded provider-native trigger, webhook mapping and destination reconciliation. |
| Repository | Focus |
|---|---|
| Shopify Revenue Leak Auditor | Browser-based product-page audits with evidence capture, weighted findings and client-ready Markdown and HTML reports. |
| Automation Debugger | Failure diagnosis, deterministic corrections and guarded local replay for automation events. |
| Sheets Airtable Sync | Row normalisation, reconciliation, exception routing and Airtable upsert planning. |
| Invoice Router | Invoice extraction, validation, review routing and accounting export preparation. |
| Review Router | Typed policy gates, confidence metadata and human review through CLI and API surfaces. |
| Automation Kit | Reusable Python, FastAPI, OpenAPI, Docker and low-code workflow patterns. |
| Browser Research | Browser-based source extraction, evidence scoring and structured research output. |
I’m also completing a Bachelor of Artificial Intelligence in Melbourne, Australia.