karolis.dev

Software development Kaunas, Lithuania

Web & mobile.
Data & AI.

Work directly with Karolis Mažukna: one engineer, end to end. Building software professionally since 2012, from web and mobile apps to data pipelines and AI workflows.

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Selected projects

Working software.
See for yourself.

Explore all five projects
Gym Occupancy Tracker comparing club occupancy over a week.

Data collection · Visualization

Gym Occupancy Tracker

From live occupancy readings to a history you can use. Compare clubs and busy periods to plan a quieter visit.

See how it works
Teleseerr media browser inside Telegram.

Telegram Mini App · Service integration

Teleseerr

Browse, request, and get media updates in Telegram, with each person's existing Seerr quotas and approval rules preserved.

See how it works

Services

Build it. Connect it.
Make it work better.

Start with the problem. We can build something new or improve the systems you already use.

Products & storefronts

Web applications

Websites, customer portals, dashboards, and internal tools.

iOS & Android apps

New mobile apps and improvements to existing ones, connected to your backend.

Shopify optimization

Faster storefronts, clearer product pages, and custom store functionality.

Data & integrations

APIs & integrations

Connect applications and third-party platforms to keep systems in sync.

Data engineering & pipelines

Big data processing and ETL/ELT pipelines for analytics and applications.

Telegram, Slack & Discord bots

Commands, notifications, automation, and Telegram Mini Apps.

AI & practical training

AI agents & workflows

Assistants connected to your tools and data, with human review where needed.

Training: LLMs at work

Practical prompting, output verification, and repeatable everyday workflows.

Infrastructure & security

AWS, DevOps & developer tools

Cloud and self-hosted infrastructure, automated deployments, and developer tooling.

Cybersecurity & hardening

Configuration and access reviews, reduced exposure, and safer credential handling.

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.

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