Stefan Keller
About me

Stefan Keller from Bavaria

Over 20 years of experience building digital systems, platforms, and processes. MVPs happen in days here, not weeks.

Profile

Building and operating systems

I build digital systems and work where processes, data, technology, and operations converge. My focus is on not just designing projects, but independently bringing them into production.

  • Digital Systems & Platforms
  • Process Architecture
  • Automation & Data Flows
  • Infrastructure & Operations
  • Product Development
  • Growth & Recruiting Systems
About

Stefan Keller

Born1984
Grew upBaltic Sea coast
TodayBavaria
Learning styleSelf-taught
LinkedIn GitHub

I'm Stefan Keller, born in 1984, grew up on the Baltic Sea coast and now live in Bavaria.

I started building my own digital projects early on and taught myself everything from design and web development to complex systems and platforms.

I'm neither a pure developer nor a pure strategist. I work where processes, data, technology, and operations come together.

Beyond my day job, I build my own products - including 12db.de, a learning platform for the amateur radio exam. I'm also a licensed ham radio operator (Class A, callsign DL1AO).

In short: I don't just plan. I build - and I make it run.

Approach

How I work

Understand
→
Structure
→
Build
→
Ship & operate

Broad foundation, clear focus

I come from design, web, content, and marketing. Today my focus is on digital systems, code, automation, and operations. The rest isn't a grab bag - it's a solid foundation.

Ownership over handoffs

I don't think in responsibilities, I think in outcomes. What gets built needs to work in the end - not just look good or sound logical.

Technologies

Skills & Technologies

Skills

  • Process Design
  • Process Automation
  • Data Models & Interfaces
  • Reporting & KPI Management
  • Operations & Monitoring

Technologies

  • Python, Flask, REST APIs
  • SQL, MariaDB
  • Linux, Git, Deployment
  • LLMs
My DNA

What do we gain if it actually works?

"That's not possible" is often just the most convenient answer. I'm always interested in what we gain if it actually works.

I'm not someone who quickly checks things off. When something grabs me, I don't let go until I have a solution.

That's not a method - it's my DNA. I keep thinking about something until it works - whether it's a system, a business model, or something entirely mundane.

I'm self-taught. I dig in. I build it. I test it. And I don't stop until it runs.

I don't start with technology, but with the system: Does this project even make sense? If yes, I'll find a way. If not, we drop it.

Origin

Not from code to marketing. From marketing to code.

SEO
→
Marketing
→
Ownership
→
Systems

My starting point wasn't technology for its own sake, but digital demand. In 2004, I built my first company in SEO. After that came performance-driven digital marketing models, then operational marketing responsibility across multiple locations.

Since 2019, I've been Head of Marketing at equal personal. I'm responsible for building and operating digital systems for marketing and recruiting - from campaign logic and applicant acquisition to tracking, reporting, and process automation.

The path to building my own systems came from practice. When existing tools don't properly map real processes, steering alone isn't enough anymore. Then you have to build it yourself.

My systems don't come from a fascination with technology, but from market understanding, operational reality, and the expectation that they work measurably.

Timeline

Career milestones

Early self-employment in web and SEO

First company at 20. Learned how digital visibility and execution work in real-world operations.

Performance, traffic, and marketing

Built scalable marketing models. Focus on measurability, distribution, and economically viable systems.

Digital products and publishing

Developed products, built structured growth and made it measurable.

Since 2019: Head of Marketing at equal personal

Full responsibility for marketing and recruiting. Building and operating digital systems - recruiting platforms, data pipelines, reporting, and internal AI infrastructure.

FAQ

Frequently asked questions

I'm Head of Marketing at equal personal, responsible for marketing and recruiting. Beyond that, I build and operate digital systems - from recruiting platforms and data pipelines to internal tools. The path there led through SEO, digital marketing, and operational marketing responsibility.
Not just websites or individual tools, but complete workflows: processes, data models, interfaces, automation, infrastructure, reporting, and operations. I'm not just interested in whether something can be built, but whether it works meaningfully within a system.
Most likely the intersection of all three. I don't come from a single discipline but combine entrepreneurial thinking with technical execution. I work on topics where strategy, processes, data, and operations converge.
I don't start with the technology, but with the system. First, I clarify what problem really needs to be solved, what dependencies exist, and whether the approach makes systemic sense. Then comes architecture, implementation, operations, and the question of whether people will actually adopt the result in their daily work.
That they serve a real purpose. No feature for the sake of a feature, no technology as an end in itself. Every function should have clear value, be measurable, and work reliably in production.
For example, recruiting and marketing systems with centralized control across multiple locations, tracking and reporting setups, standardized processes, data pipelines, and my own products like 12db.de.
12db.de is a learning platform for the amateur radio exam that I designed, developed, and operate. The project demonstrates well how I structure requirements, build systems, and take full responsibility through to operations.
People and teams working on digital systems, automation, platforms, or robust process structures - who need someone who understands the big picture and gets things done.
I don't just think in concepts, and I don't just think in code. I connect processes, data, technology, and operations, and I take responsibility for building a system that actually works in everyday use.
Contact

Get in touch

If a project needs to be not just planned but actually built, I'd love to hear from you.

Send a message LinkedIn GitHub