What Passing Tests Leave Unresolved
A small review exercise for separating fixture coverage from the assumptions a change adds to an integration.
I lead software teams and teach systems design.
I'm Mike Dabydeen, based in Toronto. I work on enterprise logistics APIs at Purolator Digital Lab and creator IP protection at UREEQA, and teach at Sheridan and Conestoga. I write about the decisions behind software that people need to operate and trust.
Recent writing
System One models in an agent loop: classify first, authorise in code
A design discussion about typed decisions and where application policy controls an agent's actions. Published on DEV, 26 September 2026.
From the archive
The Agent-Ready API Is Not an API With an MCP Server
A practical set of API properties for agent-facing workflows: explicit effects, idempotency, bounded retrieval, typed failures, and recovery.
How to setup a Ledger device
A brief explainer on how to get your Ledger device up and running, connected to the Ledger Live Desktop and/or mobile app. We also explore how to get your wallet connected to Metamask so that you can look at other crypto assets.
How to automate Kubernetes clusters using Terraform on GCP
Automating Kubernetes clusters using Terraform on Google Cloud Platform
Try the code review exercise
A shipment mapper passes its fixtures but invents a missing country. I put the code, worksheet, and worked answer together so you can inspect the assumption and make your own review decision.
Free, with no signup. This is an illustrative exercise.
Download the review kit (ZIP)Current work
- Purolator Digital Lab
- Manager of Software Development
- UREEQA
- VP of Engineering
- Sheridan and Conestoga
- Instructor