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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-connected BOM + inventory. Append-only ledger, RLS from schema up.

forja
72%
assemblio
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

Operations under the storefront.

A Shopify-connected BOM, inventory, purchasing, stocktake, goods-inwards, costing, and capacity system for assembly teams. Tenant-scoped, audit-friendly, and built around a movement ledger.

Next.js 16SupabaseShopify APIPostgres
Read →
Activity
live · 5 min
20 AprassemblioUnify UI system, section dashboard, update Supabase schema8910985
03 MarassemblioRefine UI toward Dribbble-style SaaS dashboard look472d7e5
03 MarassemblioRebuild entire UI with dark theme and green accent design3089761
03 MarassemblioFix overlapping issues on product detail pagef0891c9
View on GitHub →