Probably the biggest one in my life.
TL:DR at the bottom

A client wanted to create an online retirement calculator, sounds easy enough , i said sure.

Few days later i get an email with an excel file saying the online version has to work exactly like this and they're on a tight deadline

Having a little experience with excel, i thought eh, what could possibly go wrong, if anything i can take off the calculations from the excel file

I WAS WRONG !!!
17 Sheets, Linking each other, Passing data to each sheet to make the calculation
( Sure they had lot of stuff to calculate, like age, gender, financial group etc etc )

First thing i said to my self was, WHAT THE FREAKING FUCK IS THIS ?, WHAT YEAR IS THIS ?

After messing with it for couple of hours just to get one calculation out of it, i gave up

Thought about making a mysql database with the cell data and making the calculations, but NOOOO.
Whoever made it decided to put each cell a excel calculation ( so even if i manage to get it into a database and recode all the calculations it would be wayyy pass the deadline )

Then i had an epiphany

"What if i could just parse the excel file and get the data ?"
Did a bit of research sure enough there's a php project
( But i think it was outdated and takes about 15-25 seconds to parse, and makes a copy of the original file )

But this seemed like the best option at the time.
So downloaded the library, finished the whole thing, wrote a cron job to delete temporary files, and added a loading spinner for that delay, so people know something is happening
( and had few days to spare )

Sent the demo link to client, they were very happy with it, cause it worked same as their cute little excel file and gave the same result,

It's been live on their website for almost a year now, lot of submissions, no complains
I was feeling bit guilty just after finishing it, cause i could've done better, but not anymore

Sorry for making it so long, to understand the whole thing, you need to know the full story

TL:DR - Replicated the functionality of a 17 sheet excel calculator in php hack-ishly.

Rant about a german problem in english

I think we as the people should just sue the german government for neglect of progress and neglect of the education system. If your not familiar with the state of german IT we have worse internetspeeds than uganda or the notoriously shitty australia, our neighbourstates look at us in disbelief while laughing in optic fibre. Our school system seperates all students after 4th grade in 3 tiers, the lowest one gives you the future perspective as a social security case. The second and highest tier require masses of useless knowledge, so called "competences"(Kompetenzen) which are totally useless skills with no real world application because they are derived from real skills, a median ground between all possible applications of that skill. And while doing that they terribly insist on doing everything the "proper" way, meaning handwritten. Most people you would expect to have basic computer literacy, meaning age 40 and below, are incapable of using basic functions of a non-smartphone computer and do not understand the slightest of what they are actually doing or supposed to do. And I mean nothing technical. Germans are the reasons they still put word as a job requirement for devjobs because this disqualifies half of our population. This leads to many people having the archaeic "we versus the machines" mentality, thinking that if they ever let the computer do parts of the job, they will then lose all of it to the machines. Thats why you never strive past basic mathematical principles in mathematics, which is a big misnomer because you never do actual mathematics, only calculating and basic calculus and statics. If you get to use your calculator, its some basic casio with no actual functionality then standard operations. And even using that is shunned upon. How is this country ever supposed to become something more than it was in the 90's, if we teach people nothing of use and kill all progress in its root.

Tl;Dr - It started as an escape, carried on as fun, then as a way to be lazy, and finally as a way of life. Coding has defined and shaped my entire life from the age of nine.

When I was nine I was playing a game on my ZX spectrum and accidentally knocked the keyboard as I reached over to adjust my TV. Incredibly parts of it actually made a little sense to me and got my curiosity. I spent hours reading through that code, afraid to turn the Spectrum off in case I couldn't get back to it. Weeks later I got hold of a book of example code to copy out to do various things like making patterns on the screen. I was amazed by it. You told it what to do, and it did it! (don't you miss the days when coding worked like that?) I was bitten by the coding bug (excuse the pun) and I'd got it bad! I spent many late nights on that thing, escaping from a difficult home life. People (especially adults) were confusing, and in my experience unpredictable. When you did things wrong they shouted at you and threatened to take you away, or ignored you completely. Code never did that. If you did something wrong, it quietly let you know and often told you exactly what was wrong. It wasn't because of shifting expectations or a change of mood or anything like that. It was just clean logic, simple cause and effect.

I get my first computer a year later: an IBM XT that had been discarded by a company and was fitted with a key on the side to turn it on. With the impressive noise it made it really was like starting an engine. Whole most kids would have played with the games, I spent my time playing with batch scripts and writing very simple text adventures. And discovering what "format c:" does. With some abuse and threatened violence I managed to get windows running on it. Windows 2.1 I think it was.

At 12 I got a Gateway 75 running Windows 95. Over the next few years I do covered many amazing games: ROTT, Doom, Hexen, and so on. Aside from the games themselves, I was fascinated by the way computers could be linked together to play together (this was still early days for the Web and computers networked in a home was very unusual). I also got into making levels for Doom, Heretic, and years later Duke Nukem 3D (pretty sure it was heretic; all I remember is the nightmare of trying to write levels entirely by code!). I enjoyed re-scripting some of the weapons and monsters to behave differently. About this time I also got into HTML (I still call this coding, but not programming), C, and java. I had trouble with C as none of the examples and tutorial code seemed to run properly under a Windows environment. Similar for my very short stint with assembly. At some point I got a TI-83 programmable calculator and started rewriting my old batch script games on it, including one "Gangster Lord" game that had the same mechanics as a lot of the Facebook games that appeared later (do things, earn money, spend money to buy stuff to do more things). Worried about upcoming exams, I also made a number of maths helper apps, including a quadratic equation solver that gave the steps, and a fake calculator reset to smuggle them into my exams. When the day came I panicked and did a proper reset for fear of being caught.

At 18 I was convinced I was going to be a professional coder as I started a degree in Computer Science. Three months later I dropped out after a bunch of lectures teaching what input and output devices were and realising we were only going to be taught Java and no C++. I started a job on the call centre of a big company, but was frustrated with many of the boring and repetitive tasks we had to do. So I put my previous knowledge to use, and quickly learned VBA to automate tasks. It wasn't long before I ended up promoted to Business Analyst where I worked on a great team building small systems in Office, SAS, and a few other tools.

I decided to retrain in psychology, so left the job I was in and started another degree. During my work and placements my skills came in use a number of times to simplify and automate tasks. I finished my degree, then took a job as a teaching assistant while I worked out what I wanted to do next and how to pay for it. Three years later I've ended up IT technican at the school, responsible for the website, teaching a number of Computing lessons each week, and unofficial co-coordinator for Computing as a subject. I also run a team of ten year old Digital Leaders who I am training in online safety and as technical experts; I am hoping to inspire them to a future in coding. In September I'll be starting teacher training with a view to becoming a Computing specialist teacher. Oh, and I'm currently doing a course in Android Development in my free time.

And this all started with an accidental knock on the keyboard of a ZX Spectrum.

while true
do
age=$(echo "$age+( 1/365.25 )"| bc)
sleep 86400
done

Started at the age of 6 by doing simple calculator on zx-spectrum. Tho that's just a joke, not a professional experience. Somewhat serious project was started with PHP, without even knowing the language/theory/databases.... After that years have passed and now I can call myself: professional self-taught programmer.