From a Commodore 64 to AI Agents: Istvan Dobrentei's Journey Through Software Development
From a black-and-white TV and BASIC programming to PHP, cloud migration, DevOps, and today's world of AI agents and LLMs.
Meet Istvan Dobrentei
Some programming journeys begin with a computer science degree.
Others begin with a job.
Istvan Dobrentei's started with a Commodore 64 connected to a small black-and-white television.
At around 10 years old, Istvan encountered something that felt almost magical: a machine communicating with him through a TV screen.
The messages weren't exactly encouraging.
They included things like:
Syntax error
and
Type mismatch error
He didn't understand them yet.
But he was fascinated.
That curiosity eventually led him from BASIC to Turbo Pascal, C, Delphi, PHP, JavaScript and Java, and ultimately into a long career as a software engineer.
His first computer-related job came in 2001, working in a library where he built a PHP application that made publications searchable online.
In many ways, his journey into software development started with books.
Since then, his career has taken him through real-world business systems, legacy applications, cloud migration, DevOps, and modern web development.
Today, he is also exploring AI, LLMs and agentic architecture, alongside his background as a Zend-certified full-stack PHP developer and Microsoft- and AWS-certified engineer.
But technology is only one part of Istvan's story.
His journey has also been shaped by continuous learning, ethical decisions, difficult experiences, resilience, and the realization that good software is about much more than simply making code work.
In this Developer Story, Istvan takes us from his first Commodore 64 to the modern world of AI and shares the lessons he has learned along the way.
Istvan's Story
It Started With a Commodore 64
When I was around 10 years old, I got my first computer: a Commodore 64.
At that time, it was something truly special.
Have you ever heard about the COCOM list?
Technology behind the Iron Curtain was very limited.
There was no monitor, so we had to connect the machine to a TV and manually adjust the frequency just to see the command prompt on the screen.
Back then, even having a color TV was a big deal.
I remember that I only had a small black-and-white TV called Junoszty.
In our country, there weren't many opportunities to learn English during that period.
Russian was mandatory in school, and I could choose only one additional language: German.
So when I saw the very first message appear on the black-and-white TV screen, I felt like I was on the moon.
The machine was communicating with me!
The messages were things like:
Syntax error
and
Type mismatch error
At that time, I had no idea what they meant, but I was fascinated.
Today, of course, I understand them well, but back then it felt almost magical.
Imagining a Worldwide Computer Network
I also clearly remember reading an article about computer networks in a magazine around 1992.
They wrote about CompuServe, and I imagined what a worldwide computer network could look like.
Today, of course, we know it as the World Wide Web.
My friends and I spent many hours playing games on that machine.
But eventually, programming became more interesting than simply using the computer.
One day, a friend gave me a book about the BASIC programming language.
I was probably 12 or 13 years old, and that was when I started learning programming by myself.
Later, in school, I chose computer science subjects to learn more.
We started with BASIC, then moved on to:
Around 2000, I learned PHP and JavaScript, and later Java.
Learning the Fundamentals
At the very beginning, in the classroom environment, I learned from mathematics teachers and solved basic mathematical and programming problems.
I also had a book full of beginner programming exercises.
Learning the fundamentals was very important.
I created many side projects that helped solve different kinds of problems.
For example, I developed an application that helped teachers organize class schedules and subject timelines for different classrooms.
Those projects gave me something that books alone couldn't provide:
practice.
You learn something differently when you actually have to make it work.
Interestingly, my first job was not related to computers.
I first worked as a book sales agent, and later I worked in a library.
That became my first computer-related job in 2001.
There, I learned PHP and created my first real application.
It helped organize different kinds of publications and made them searchable through an online interface.
Looking back, there is something quite fitting about this.
My journey into software development started with books.
Those early experiences eventually led me into professional web development and a career that would span many different technologies.
What Years of Experience Changed
It is really interesting because today I see myself in a different way.
After many years of experience, I see things very differently than I did when I was younger.
I have seen many kinds of code across many different domains and businesses of various sizes.
I have seen insightful and highly successful companies, but also shrinking businesses, along with the codebases behind those business models.
One surprising realization was that the best-designed and most well-organized code wasn't always the one that generated huge profits or became the most successful.
That was a key moment for me.
It taught me that business success depends on many factors beyond technology alone.
At the same time, I realized that good architecture and clean code are essential for long-term success.
Good code improves:
- maintainability
- scalability
- teamwork
- long-term sustainability
In many cases, poorly designed systems eventually become difficult to maintain and slow down innovation.
So I've learned that software engineering requires a balance.
Technology matters, but technology alone does not determine business success.
The Challenge of Working With Real Businesses
One of the biggest challenges in my developer journey was working as an independent contractor for SMEs.
I saw many interesting business ideas and situations from a business perspective.
However, I always stayed committed to ethical and legal principles.
Whenever I was asked to do something that was against the law or not ethical, I said no.
For me, that is an important part of being a professional.
Developers can have access to sensitive systems, information, business processes, and data.
Technical ability comes with responsibility.
Sometimes doing the right thing means refusing to do something.
Migrating a Legacy Webshop to the Cloud
Another major challenge was migrating a live legacy webshop to a cloud environment.
At that time, cloud technologies were a completely new area for me.
I had to quickly learn many different concepts and technologies.
To overcome the challenge, I invested a lot of time in learning, earned relevant certifications, and continuously improved my knowledge step by step.
In the end, the migration was successful.
The experience taught me the importance of:
- adaptability
- continuous learning
- persistence
Technology doesn't wait for you to become comfortable.
Sometimes you have to learn something new because the project demands it.
There Is No Single Technology That Defines a Developer
I don't think there is a single technology that I could highlight as being responsible for my growth.
In the IT industry, continuous learning and self-learning are what really matter.
New solutions, tools, and resources appear every month, especially in today's world.
One thing is certain:
Continuous learning and adapting to change are essential.
Instead of focusing only on specific technologies, I would highlight:
- critical thinking
- curiosity
- the ability to learn new things every day
- adapting to change
Technologies will come and go.
The ability to learn remains.
The Job That Taught Me a Difficult Lesson
I remember a sad story, although today I can laugh about it.
At the time, however, it was a very difficult experience.
Once, I applied for a job where my task was to create an Android application to handle one of the company's logistics business functions.
It was an experimental project.
The company worked in a team environment without any version control and without applying object-oriented principles.
That really shocked me.
One day, the CEO asked for my opinion about their system.
I spent the weekend preparing a detailed and honest presentation and presented it to the team.
The next day, I was unemployed.
I did not criticize the system personally.
I only highlighted the main issues and shared what I had learned over the years.
It was a difficult experience.
But it taught me something important.
Life can sometimes be difficult and unfair.
Not every situation will reward honesty immediately.
But persistence and hard work eventually pay off.
Never give up.
Learning to Think Like a Developer
At the beginning of my learning journey, even solving simple tasks programmatically was a challenge.
Learning how to think like a developer and how to write code was not easy at first.
I believe software development is a step-by-step journey.
One of the most important lessons I learned is to try solving problems by yourself instead of always looking for shortcuts.
Practice is essential.
The more you build, experiment, and learn from mistakes, the more you improve over time.
You don't become a better developer simply by reading about programming.
You become better by actually doing it.
Nobody Is Perfect
Another important lesson is that nobody is perfect, and growth is a continuous process.
Mistakes are a natural part of learning.
The real question is whether you are able to reflect on them, adapt, and move forward.
This is especially important in technology because there is always something new to learn.
You will make mistakes.
You will sometimes choose the wrong technology.
You will sometimes write code that you later want to rewrite.
That's normal.
What matters is what you learn from the experience.
Resilience Matters
I also learned the importance of resilience.
Resilience is the ability to recharge yourself after challenges and keep going even when things become difficult.
Software development can be frustrating.
Projects can fail.
Jobs can end unexpectedly.
Technologies can change.
You can spend days solving a problem that seemed like it should take an hour.
The ability to recover and continue is therefore just as important as technical knowledge.
Learn From Other People
Having mentors and being open to feedback is extremely valuable.
Nobody can know everything or be an expert in every area.
It is essential to accept advice and learn from others.
Doing so can accelerate both personal and professional growth much faster than trying to figure everything out alone.
Don't hesitate to ask questions.
Don't be afraid to admit that you don't understand something.
Learning from other people is not a weakness.
It is one of the fastest ways to grow.
From PHP to Cloud and AI
My technology journey has continued to evolve.
PHP and web development remain an important part of my background, but my interests have expanded into cloud, DevOps, AI, and modern development tools.
I've earned certifications including:
- PHP Zend Engineer
- Microsoft Azure Fundamentals
- Microsoft Azure Developer Associate
- Microsoft DevOps Engineer Expert
- AWS Certified AI Practitioner
Today, I'm particularly interested in LLMs, AI, cloud technologies, and AI agents.
The interesting thing about technology is that the learning never really stops.
The Commodore 64 I used as a child could not have prepared me for today's AI systems.
But the curiosity that made me want to understand that first computer is still useful.
The tools changed.
The curiosity didn't.
Advice for Developers Starting Today
As I mentioned earlier, in our rapidly changing world, the most important thing is to keep learning new things, stay curious, and never give up.
Hard work pays off in the long term.
Teamwork is also very important because nobody can know everything or be an expert in every area.
It is essential to truly understand what you are doing.
Don't just copy and paste code.
Understand why it works.
Understand why a feature works.
And understand why a feature may not work.
If you have doubts or don't understand something, ask for help.
There is nothing wrong with asking questions.
In fact, asking the right question can sometimes teach you more than finding the answer yourself.
My Experience With CoderLegion
It was a surprise for me when I was first invited to create publications.
It is an honor to share my thoughts with the community through a platform like CoderLegion.
It is also great to see the active community and the engagement behind the platform.
I have been able to read many interesting and up-to-date articles from talented people all around the world.
This gives me motivation to keep moving forward and continue learning.
Thank you for the opportunity, and I wish continued success to both the community and CoderLegion.
Looking Back
When I think about my journey, the contrast is quite remarkable.
I started with a Commodore 64 connected to a black-and-white television.
I learned BASIC from a book.
Then came Turbo Pascal, C, Delphi, PHP, JavaScript, and Java.
I worked in a library and built a searchable publication system.
I worked with real businesses and legacy systems.
I learned cloud technologies when they were new to me.
I earned certifications and continued developing my skills.
And today, I'm exploring AI, LLMs, cloud technologies, and AI agents.
The technology has changed dramatically.
But the fundamental lesson has remained the same:
Stay curious. Keep learning. Never give up.
About Istvan Dobrentei
Istvan Dobrentei is a Software Engineer and Zend-certified full-stack PHP developer based in Hungary.
His technical background includes PHP, JavaScript, Python, Docker, MySQL, Ansible, and GitHub, alongside extensive experience with Microsoft Azure and DevOps.
He holds certifications including PHP Zend Engineer, AWS Certified AI Practitioner, Microsoft Azure Developer Associate, and Microsoft DevOps Engineer Expert.
Today, Istvan is exploring LLMs, AI, cloud technologies, AI agents, and agentic architecture, continuing a technology journey that began with a Commodore 64 when he was a child.
You can learn more about Istvan and his work on his website and CoderLegion profile.
A Final Thought
Istvan's journey shows how dramatically a developer's world can change.
A child connecting a Commodore 64 to a black-and-white television could hardly have imagined today's cloud platforms, AI agents, and large language models.
But perhaps the most important skill was already there.
Curiosity.
The desire to understand how something works.
The willingness to learn.
The courage to ask questions.
And the resilience to keep going when things don't work out.
Technologies will continue to change.
Programming languages will evolve.
New AI systems will appear.
But the developers who continue to learn, adapt, and stay curious will always have somewhere to go next.
The technology changes. The learning never stops.
This Developer Story is part of CoderLegion's Developer Stories series, where we share the real journeys, experiences, challenges, and lessons of developers from our community.
