// About us

Two school friends who build software that saves time.

Aleksandar Jovanovic and Tilman Kieselbach have known each other since school — today they run The CodeCave together. We digitalize and automate workflows, build apps and websites, and put AI to work exactly where it saves real hours.

Founded 2018

Apps live 20+ in the stores

Total users 210,000+

Location Frechen, NRW

// Our story

It started in advanced-level computer science.

Til and I are school friends — we know each other from Helmholtz-Gymnasium in Bielefeld. In the advanced computer-science course we realized we both genuinely love programming, and that shared interest turned into our first hobby projects.

In 2018 we got serious about it and founded K&J Software Solutions GbR alongside our studies — mobile apps and smaller software solutions, at first as a hobby. In 2021 we took it up a level and founded The CodeCave GmbH in Bielefeld. Since mid-2022 both of us have been fully self-employed, working exclusively for The CodeCave.

In 2025 we moved from Bielefeld to Frechen near Cologne — a lot shifted privately too: Til now lives in Cologne, and I live in Dortmund.

What do we stand for? Saving human resources and using them well — cutting out wasted time and money. With AI and clean automation that works surprisingly well. And we make sure a company’s quality shows on the web, too.

Main entrance of Helmholtz-Gymnasium in Bielefeld with a brick stairway — Helmholtz-Gymnasium in Bielefeld — where we first met. Photo: SatanicHorse · CC BY-SA 4.0

// Our studio

Our office in Bielefeld.

Friedenstraße 11: two height-adjustable desks, plenty of screen space and a couch for breaks. A lot took shape here before we moved to Frechen in 2025.

Tilman Kieselbach working focused at a dual-monitor setup in the Bielefeld office — Deep focus at the dual-monitor desk.

Office lounge area with a blue sofa and a view into the second workspace — The lounge with a view into the second office.

Bright workspace with ultrawide monitors, plants and height-adjustable desks — The main workspace with an ultrawide setup.

Aleksandar Jovanovic holding a newspaper article about the RoadReview app in front of the CodeCave banner — RoadReview in the paper — one of our apps in the press.

// History

From a hobby to a GmbH.

A few milestones on the way from two students with a laptop to a workshop with 20+ apps in the stores.

until 2017

School friends & first lines of code

Helmholtz-Gymnasium Bielefeld, advanced computer-science course. First joint hobby projects.
2018

K&J Software Solutions GbR

Founded alongside our studies — mobile apps and smaller software solutions.
2021

The CodeCave GmbH

A level up: founding the GmbH in Bielefeld.
2022

Full-time self-employed

Since mid-2022 both of us work exclusively for The CodeCave.
2025

Move to Frechen

From Bielefeld to Frechen near Cologne — closer to our clients in the Rhineland.
today

20+ apps, 210,000+ users

Across industries: apps, web, internal software, AI and automation.

// Focus

What we specialize in.

We dig into your existing workflows — and don’t just tell you how to automate them, but how to streamline them: more time- and cost-efficient.

Digitalization & automation

Understanding existing workflows, streamlining and automating them — for measurably less manual work.

AI as a tool

Automatic email recognition, PDF processing, data extraction and ERP integration — AI that works in the background.

Apps & custom software

iOS, Android, iPad/tablet and internal tools. B2B and B2C, from kickoff to release.

Web & visibility

Websites and landing pages plus search optimization — classic for Google and modern for AI systems (GEO).

// The founders

Hand & mind — as a duo.

Aleksandar takes care of everything you see and touch. Tilman makes sure everything runs smoothly behind the scenes.

Aleksandar Jovanovic

Co-founder & managing director

The human side of the product — UX, design and visibility.

I’m the one for everything you see, touch and experience: I build the mobile apps, design the UIs and landing pages, and own the user experience. A particular focus of mine is search optimization — classic for Google and modern for AI systems.

I studied Business Informatics with a focus on software engineering at FHDW Bielefeld (B.Sc., 2018–2021, bachelor’s thesis graded 1.0) — trained in the dual model as an SAP developer at itelligence AG and then employed for a year as a full-time SAP developer. From 2023 to 2026 I taught the next generation at FHDW in Bielefeld and Paderborn.

Focus

Mobile apps
UI/UX design
Landing pages
SEO & GEO
SAP / ERP

Background

Role: Managing director · UX & client lead
Studies: Business Informatics B.Sc. · FHDW Bielefeld (2018–2021)
Practice: SAP developer · itelligence AG (2018–2022)
Teaching: Lecturer · FHDW Bielefeld & Paderborn (2023–2026)
Based in: Dortmund

FHDW building in Bielefeld with the FHDW sign in the foreground — FHDW Bielefeld — where I studied and later taught myself. Photo: Pogo85 · CC BY-SA 4.0

Profiles

LinkedIn GitHub X / Twitter Email

Tilman Kieselbach

Co-founder & technical lead

The engineer behind the scenes — backend, AI and hardware.

I’m the slightly nerdier half of the two of us, and I make sure everything runs reliably behind the scenes. My strengths are AI integrations, connecting company devices and machines, and server applications — the tech you don’t see but feel every day.

I studied Computer Visualistics and Design at Hamm-Lippstadt University of Applied Sciences (from 2018). In 2021 I paused my studies in favor of our business to focus fully on The CodeCave.

Focus

Backend & servers
AI integrations
Hardware integration
Automation
System architecture

Background

Role: Project lead · engineering & management
Studies: Computer Visualistics and Design · Hamm-Lippstadt UAS (from 2018)
Focus: AI, hardware & server integrations
Based in: Cologne

Profiles

Two school friends who build software that saves time.