Web applications developer, chess player, and educator.

I'm Andrei Ostrovskii, a web developer based in Cologne, Germany. I have been deploying my code to production since 2019. I have been playing chess since I was five. I enjoy finding efficient solutions to challenging problems and gladly teach – I am thrilled when others can benefit from my knowledge and experience.

  1. Present ⇐ 2025
    crossbuilders GmbH Senior full-stack developer

    IT solutions in the sphere of financial services and insurance.

  2. 2024 ⇐ 2019
    antwerpes ag Web applications developer

    as of late 2024, known as DocCheck agency AG

    I have dealt with the full-stack development, deployment, and maintenance of tailored applications. Projects have ranged from one-off campaigns to full-fledged web solutions like platforms, shops, and CRMs. I have also developed APIs for other teams to consume and occasionally contributed to developing internal tools.

  3. 2021 ⇐ 2016
    chess24 Freelance educational content creator

    I have been hosting instructive weekly live streams on the leading educational chess platform of the time. As of 2024, the platform is closed, but you can still find my chess24 shows on YouTube.

  4. 2015 ⇐ 2010
    online store Co-founder

    We launched an online store as part of the broader family children's wear retail business in Ukraine. During its years of operation, I was primarily involved in sales, accounting, and technical maintenance.

core stack

Languages

  • PHP
  • SQL
  • JavaScript
  • HTML
  • CSS
core stack

Frameworks and libraries

  • Laravel
  • Livewire
  • Alpine.js
  • Tailwind CSS
  • PHPUnit
core stack

Infrastructure

  • Linux
  • Docker
  • GitLab CI
  • Deployment tools
  • Nginx / Apache
could do

Tinkering with

  • React
  • Express.js
  • Python
  • Symfony
  • Shopware
would learn

In the pipeline

  • Go
  • DevOps
  • Cloud development
  • Deep learning
  • C (#, ++)
using

Miscellaneous

  • Ubuntu, Bash
  • PhpStorm, VS Code
  • Jira, Confluence
  • Slack, MS Teams
  • English, German, Ukrainian, Russian