Web applications
Custom websites, customer portals, dashboards, and internal tools. Frontend and backend development shaped around what your users need to do.
Software development Kaunas, Lithuania
Web & mobile.
Data & AI.
Karolis dev MB turns ideas into working software, fast. Web and mobile applications, data pipelines, integrations, and AI workflows built around your business.
See our projectsServices
Build it. Connect it.
Make it work better.
Applications, data pipelines, infrastructure, and automation. Build something new or improve the systems you already use.
APIs & integrations
APIs that connect your applications and services. Bring data together, connect third-party platforms, and keep systems working in sync.
Data engineering & pipelines
Big data processing and ETL/ELT pipelines. Collect, clean, transform, and move large datasets between systems, ready for analytics, reporting, and applications.
AI agents & workflows
AI assistants and agentic workflows connected to your tools and data. Combine language models, APIs, and human review for research, document processing, and other tasks across systems.
iOS & Android apps
Mobile application development for iPhone and Android. Build a new app, improve an existing one, or connect a mobile experience to your backend.
Shopify optimization
Faster storefronts, clearer product pages, and custom store functionality. Improve themes, navigation, and integrations to make shopping easier.
Telegram, Slack & Discord bots
Custom bots that add the functionality your platform is missing. Connect services, automate routine tasks, and build commands, notifications, and Telegram Mini Apps that work where you already communicate.
AWS, DevOps & developer tools
Design and maintain AWS cloud infrastructure alongside Linux, Docker, and Proxmox environments. Automate builds and deployments, create developer tools, and simplify the everyday work of running software in the cloud or on your own hardware.
Cybersecurity & hardening
Strengthen systems and the processes around them. Review configurations and access controls, reduce unnecessary exposure, and improve how updates, credentials, and sensitive data are handled.
Training: LLMs at work
Practical training on using LLMs in everyday work. Write better prompts, verify outputs, handle sensitive information responsibly, and turn useful experiments into repeatable workflows.
About
One engineer,
end to end.
Karolis dev MB is led by Karolis Mažukna, the company's owner, director, and hands-on software engineer.
Building software professionally since 2012, Karolis stays involved from the first rough idea through architecture, implementation, release, and iteration. His range spans web and mobile applications, data pipelines, AI automation, infrastructure, developer tooling, and security.
The result is a direct working relationship, faster decisions, and clear accountability for how the whole system fits together.
Contact
Have an idea or an IT question?
Bring the rough version. We can help shape the idea, explain the options, and prepare a quote. General IT questions are welcome too.
Start a conversation