The first paid client, and a brief that had almost nothing technical in it. The owner did not want a feature list — he wanted a site that felt like his gym. That is a genuinely harder requirement than a specification, because there is nothing to verify it against: a gym has a character built out of the room, the equipment, the kind of people who train there and how the place makes them feel, and the site had to carry that across to someone who has never walked in. A generic template with the logo dropped in would have satisfied every functional requirement and failed the actual one.
The work went into design rather than architecture, which is where the difficulty was. Getting to a direction that matched the brand's feel — rather than one that merely looked competent — took the bulk of the effort, and the build stayed deliberately simple so that effort could go into the surface a visitor actually judges: a landing page with a clear line through it, training programmes and plans presented so a prospect can find the one that fits them, and a route to signing up that does not make them hunt. The client's verdict was that it came out ahead of what he had expected, which for a first commercial project was the outcome that mattered.