I build and fix the systems small and mid-size businesses run on, and add AI where it actually helps. I use Claude Code daily to move fast, and I review and test every change myself.
Six services, each one scoped in writing and fixed-price before work starts.
Document extraction, support agents and AI features inside the app you already run.
from US$1,000
Stripe, accounting, email and webhooks connected properly, including replacing fragile Zapier and n8n flows.
from US$500
React and TypeScript on the front, ASP.NET Core behind it.
from US$2,000
Your most expensive queries, deadlocks and indexing problems, in a written report ranked by impact with scripts ready to review. Read-only access is enough.
from US$350
An assessment of your services, clients and dependencies, with a migration plan that keeps existing integrations working.
assessment from US$600
I take over an unfinished or AI-generated codebase, stabilise it and add tests.
from US$500
Public demos you can run yourself (all of them at demo.oct28th.com), built on a fictional courier company with invented data. Every number here was measured and is in the repo.
Five common production problems reproduced, fixed and measured on a generated database of 600,000 jobs and 2.19M job events.
20 deadlocks to 0. Two concurrent batches went from finishing none of 40,000 jobs to finishing all of them.
A .NET Framework 4.8 WCF service moved to ASP.NET Core with CoreWCF, plus a new REST API with OpenAPI on one shared application layer.
One address changed. The compiled legacy client was pointed at the new host, and its output matched the old service line for line.
The tests replay SOAP traffic recorded from the real service. Breaking the contract on purpose failed 6 of them, which is the point.
Delivery dockets, invoices and booking emails turned into data, with schema validation and a human review queue.
Doubtful documents go to a person. Of 7 sample dockets, invoices and emails, 3 were accepted automatically and 4 went to review, including a wrong GST line. Runs offline with recorded model responses.
A support agent with tool calling, guardrails and an evaluation suite.
Guardrails live in code. Identity checks and explicit yes for any change hold even when a scripted model is fooled into trying.
A full-stack operations dashboard on React 19, ASP.NET Core and SignalR.
One live screen for today. KPIs, a server-paged jobs table and SignalR updates. The live demo runs in your browser on fictional data.
Reliable Stripe to accounting to email automation with idempotency, an outbox, retries and dead-letter replay.
Exactly once, under load. 1,100 requests with 100 duplicates and 32 in parallel produced exactly one invoice, row and receipt per event, with zero dead letters, in 4 of 4 runs.
15 years of C#/.NET on logistics systems that cannot go down, including for a New Zealand courier and logistics operator.
Backend architecture owner for a multi-tenant transport management platform moving over 2,000 courier jobs a day, peaking above 5,300.
A SQL Server schema of 1,700+ stored procedures, evolved through 1,600+ tracked migrations.
Diagnosed recurring SQL Server deadlocks under bulk upload and fixed them with a targeted batch-commit retry.
Migrated a WCF-era customer integration API to .NET 8, keeping the legacy bindings live.
Led a ground-up rewrite of a route-planning system on .NET 10 and TypeScript, verified with Playwright tests.
Moved CI from Azure DevOps to GitLab CI and containerised services with Docker across eight repositories.
You know what you are getting and what it costs before I start. If the scope changes, we agree it in writing first.
I use Claude Code daily because it makes me faster. Every change is reviewed and tested by me before it reaches you.
You get the code, the scripts and notes your team can follow, so you are not dependent on me afterwards.
My working day overlaps Australia, New Zealand and US evenings.
A short description of the system and the problem is enough to start. I will tell you honestly whether I am the right fit.