Most websites do not fail on launch day. They fail a year later, when a new page takes two weeks to add, the booking form quietly stops sending emails, and nobody remembers how the thing was built.
Good development is mostly about avoiding that. Here are the rules we follow on every project, in the order they matter.
1. Render on the server first
Send real HTML from the server. The page should read correctly before a single line of JavaScript runs. It loads faster on slow phones, search engines read all of it, and if a script fails the page still works.
Use JavaScript for what needs it: a date picker, a live price, a gallery. Not for putting text on the screen.
2. Set a performance budget before you design
Decide the limits up front and treat them like requirements:
- Main content visible in under 2.5 seconds on a mid-range phone (Google calls this LCP).
- Taps answered in under 200 ms (INP).
- Nothing jumping around while it loads (CLS under 0.1).
Then check every new feature against them. A carousel library that costs a second is a design decision, not a detail.
3. Treat images as the biggest risk
On most sites, images are most of the weight. Serve WebP or AVIF, size them for the screen that asks, give every image a width and height so the layout does not shift, and only load the first image eagerly. Everything below the fold can wait.
4. Build forms that tell the truth
A form is where a visitor becomes a customer, so it deserves the most care:
- Validate on the server, always. Browser checks are a convenience, not protection.
- Show errors next to the field, in plain words: "Enter a valid email", not "Invalid input".
- Keep what the person typed when something goes wrong.
- Confirm success clearly, and send the confirmation email right away.
- Log failures somewhere you will actually see them.
5. Accessibility is part of the job
Real buttons for actions, real links for navigation, labels on every input, visible focus, and enough contrast to read in sunlight. It helps people using screen readers, and it helps everyone else too. In the EU, the European Accessibility Act has applied to many consumer websites since June 2025, so it is no longer optional there either.
6. Security basics, done every time
- HTTPS everywhere, and secure cookies.
- Secrets in environment variables, never in the code.
- Every input treated as hostile until checked.
- Admin areas behind proper login, and kept out of search engines.
- Dependencies kept up to date, not "when we have time".
7. Keep content out of the code
If changing a price or adding a project needs a developer, the site is built wrong. Content belongs in a CMS the owner can use. Code belongs to the things that do not change every week.
8. Name things for the next person
Clear file names, one component per job, and a short README that explains how to run it and where things live. The next developer might be you in eighteen months, having forgotten everything.
9. Test what earns money
You do not need tests for everything. You do need them for the booking flow, the checkout, the contact form and the payment emails. Those are the parts that cost money when they break silently.
10. Ship small, measure, repeat
Launch the smallest version that works, watch real visitors, then improve. Most of our best decisions came from what people actually did, not from what we assumed in a meeting.
What this looks like on a real project
On MTS Transfers, the price is calculated from the distance between pickup and drop-off, so every customer gets the same answer. After payment, the customer gets a confirmation email and the team gets an alert, automatically. Simple rules, applied every time.
Search visibility has its own checklist, covered in SEO best practices when building a website. For layouts that hold up on every screen, see responsive web design techniques.
Want a site built this way? Tell us about your project.
