Source: https://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.

[See our projects](https://karolis.dev/projects/)

[Share an idea or a question](https://karolis.dev/contact/)

Selected projects

## Working software. See for yourself.

[Explore all five projects](https://karolis.dev/projects/)

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](https://karolis.dev/projects/#gym-tracker)

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](https://karolis.dev/projects/#teleseerr)

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.

[Start a conversation](https://karolis.dev/contact/)