I’m currently relearning the Core Three — HTML, CSS, and JavaScript — as I work toward becoming a full-stack JavaScript developer.
Before I came back to learning software, I spent 22 years working industrial turnarounds.
One lesson from that world has followed me into software engineering:
Never trust a single point of failure.
In industrial maintenance, there’s a safety practice called double block-and-bleed.
Instead of trusting one isolation valve, you use two independent valves with a bleed point between them. If one valve leaks, you know immediately. The entire system assumes individual components can fail.
Safety doesn’t come from perfect parts.
It comes from independent layers of protection.
That idea completely changed how I think about CI pipelines.
When I first started relearning web development, my mindset was simple:
Run Lighthouse.
Everything green?
Great.
100 across the board locally?
Even better.
Ship it.
Different results after deployment?
Uh-oh.
Now I see Lighthouse as one checkpoint — not the finish line.
A fast website can still have accessibility issues.
An accessible site can still have broken metadata.
Good SEO won’t catch rendering bugs.
Passing unit tests won’t tell you if the generated HTML is malformed.
Every tool has blind spots.
No single tool should get the final vote.
So instead of asking:
“Did my tests pass?”
I ask:
“What kinds of failures could still slip through?”
That question naturally leads to layered validation.
- Formatting
- Linting
- Type checking
- Accessibility checks
- Performance audits
- HTML validation
- SEO analysis
- Manual review
None of these tools is perfect.
Together, they’re much stronger than any one of them alone.
The more I learn about software, the more I find myself applying lessons from heavy industry.
Different environment.
Different risks.
The same engineering mindset.
Assume components will fail.
Design systems that fail safely.
That’s becoming the philosophy behind every test matrix and CI pipeline I’m designing.
What’s one engineering principle from outside software that’s changed the way you write code?
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