A guide to set up a modern Python development environment using uv, the fast all-in-one tool from Astral that replaces pyenv, virtualenv, and Poetry.
Duncan Leung
📚 Learning, 👨🏻💻 Building, 📝 Documenting...
Hi! I'm Duncan Leung and I currently lead Frontend Engineering at Airvet.
In a previous career I worked overseas in Beijing as a Product Manager at a skunkworks studio building digital experience projects for Ford Motor (China) and consulted on UX projects for Starwood Hotels. During this time I also mentored startups at Chinaccelerator and ran startup events and hackathons in Shanghai.
👨🏻💻 I'm a self taught software developer, and this is a place for me to jot down some notes. I mostly cover Javascript, Typescript, React, and software development.
Latest Writing
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Read articleMost env-var validation checks that values exist. That catches missing config but misses the worse case - a value that is present, valid in shape, and silently wrong. Here is the asymmetric pattern for separating loud failures from silent ones in a Next.js server.
Read articleWhen one Go struct legitimately serves multiple consumer roles - producer, service, admin - declare three interfaces and let DI cache the singleton at the wide type while each consumer holds only the methods it can call. Same shape as io.ReadWriteCloser in the stdlib.
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Most SQS idempotency guides reach for Redis dedupe keys or dedupe tables. If your worker's job ends in a terminal state-machine transition, the row's own status column is already the lock - and one UPDATE statement is the entire safety story.
Read articleA talk I gave to the Airvet engineering org on working with AI coding agents - the mental model, context engineering, and the Research → Plan → Implement loop that ties them together.
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