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Independent Engineering — AVAILABLE Q2 2026
ASPERIMONSENKS

Kasper Simonsen — Independent Software Engineer, Melbourne

12 years getting things to work. I build custom software for businesses when the off-the-shelf tools don't fit. Web, iPhone, Android. Apps that run factory floors, Shopify backends that handle the awkward bits, AI agents that write industrial control code. Based in Melbourne. Taking on selective contract work — get in touch.

Melbourne · AEST · UTC+10

Systems in prod

02

Multi-agent pipeline → Siemens SCL. Auto-learns from compile errors.

Shopify-native manufacturing ops — BOMs, inventory, purchasing, capacity. Tenant-scoped, append-only ledger.

forja
72%
manuva
60%

Primary stack

tsreactpostgresnextsupabaseclaude.net

Primary stack

tsCompile-time safety at multi-tenant scale
reactServer components — zero JS where possible
postgresRLS-scoped, 40+ tables, append-only ledgers
nextApp Router, ISR, edge-ready. Powers this site
supabasePostgres + Auth + Edge Functions in one
claudeLLM backbone for the seven-agent pipeline
.netOnly programmatic path into TIA Portal
Selected work
02 projects
BUILDING v0.4.2
2025 → present
LLM Systems

Code that stays in spec.

Eight AI agents for Siemens TIA Portal projects — turning functional specs into compiling SCL and HMI, and turning legacy projects back into editable specs. Pattern library grows with every correction.

React 19Claude API.NET 4.8Supabase
Read →
REBUILDING — v2
2024 → present
Multi-tenant SaaS

Manufacturing operations, under the storefront.

Manufacturing-operations software for Shopify-native product brands. Inventory, multi-level BOMs, production orders, purchasing, stocktake, reports, and capacity planning in one connected system — replacing the spreadsheets and bolted-together MRP those brands typically end up running.

Next.js 16SupabaseShopify APIMulti-tenant
Read →
Activity
live · 5 min
26 Julypac-forgefix(bridge): make generated projects reachable and simulatable; v1.9.0 (G9-W10, G9-W11)58ce776
26 Julypac-forgefeat(dashboard): schematic plant mimic, live IO page and a drivable EM command seam96ce0bb
26 Julypac-forgedocs: handover for the PLCSIM run loop and generated commissioning HMI93d0853
25 Julypac-forgedocs: implementation plan for re-addressing IO from hardware (G0-18)dc26894
View on GitHub →