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12 Hard Truths About Coding I Learned the Hard Way After 10+ Years

Cesar Aguirre on June 08, 2026

I got fired from my first job, took down a database server with a badly written query, and was rejected from a FAANG. That all happened over the pa...
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klaudiagrz profile image
Klaudia Grzondziel

After coding comes deployment, testing, user adoption, customer support, and follow-up.

... and the documentation you skipped in point 3 😂 A product needs documentation for someone who will use it and doesn't have all the context that you have.

The more senior you become, the less it's about coding and the more about meetings.

This is also painfully true... that's why I tend to start looking for a new job when this happens. There's nothing wrong with sharing experience and teaching juniors, but when the work starts to be an endless loop of meetings, I simply lose interest.

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Cesar Aguirre

... and the documentation you skipped in point 3 😂

Right!

...when the work starts to be an endless loop of meetings, I simply lose interest.

Same around here. Just crossing my fingers waiting AI to kill meetings and Scrum

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HARD IN SOFT OUT

Hey,

Reading this felt like looking into a mirror – especially points #2, #4, and #12.

I've been building SHALA (Supportive Help Agent and Lifeline Assistant) and working on an LLM Security Audit tool, and honestly? The gap between "code works on my machine" and "code works for real users globally" is where most of the hard lessons live.

4 (The work isn't over when you finish coding) – yes. Deployment, monitoring, user trust, security follow-ups… that's 80% of the actual job.

And #12 (Solve the problem you have today) is something I constantly have to remind myself. With LLM security especially, it's tempting to over-engineer for threats that don't exist yet. But shipping something solid now > planning for every edge case.

10 and #11 about communication problems – couldn't agree more. The worst bugs I've seen weren't about bad logic. They were about assumptions nobody wrote down.

Anyway, appreciate you sharing this. It's a good reality check for anyone who thinks 10+ years means "easy mode." Would love to connect if you're open to chatting about building ambitious, global-scale products – lessons like these are gold for teams trying to move fast without breaking everything.

Cheers,
Jack

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Cesar Aguirre

The gap between "code works on my machine" and "code works for real users globally" is where most of the hard lessons live.

That's when the job starts :)

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Pietro Maffi

Totally agree! And thinking to Agile Principle... you reported many of them here... this experience is the one every senior coder face during their experience...
May be the one missing is: Simplicity--the art of maximizing the amount
of work not done--is essential.

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Cesar Aguirre

Simplicity--the art of maximizing the amount of work not done--is essential

The more code, the more problems :P

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johnnylemonny profile image
𝗝𝗼𝗵𝗻

Great read. These hard truths really resonate. I especially agree with the emphasis on showing progress over perfect estimates, the importance of testing and deployment, and how communication often makes or breaks a project. As you said, senior roles bring more meetings, so protecting focused coding time and automating what machines can do are practical ways to stay effective. Thanks for sharing such honest, actionable lessons.

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Baltasar García Perez-Schofield

After coding comes deployment, testing, user adoption, customer support, and follow-up.

Very true. Unless nobody is going to use it. Apart from yourself, that is. ;-)

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Cesar Aguirre

Good point! Well, in that case, we are our own end user and main dev team :)

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mythorian_b77f3ebd0bce9c7 profile image
Mythorian

love it. short and useful.

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canro91 profile image
Cesar Aguirre

Thanks :)

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Quentin Merle

So damn right!

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Cesar Aguirre

Thanks! :P

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neither galax

Totally resonate. and especially #12, 100%

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Cesar Aguirre

Glad to know I'm not alone with #12 :)

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Mykola Kondratiuk

the visibility one is the hardest to internalize. shipped a clean refactor with zero communication, watched a messier feature with daily updates get more org credit. the work and the signal about the work are separate jobs.