IOANNIS KOSMAS
Athens
Overview
7
7
years of professional experience
1
1
Certification
Work History
Full Stack Developer
Yettel Bulgaria
10.2021 - Current
- Developed and optimized the retail portal for Yettel Bulgaria based on a native Drupal 7 stack with MariaDB backend.
- Migrate Drupal7 to Drupal 10.
- Developed and maintained RESTful APIs for Drupal 10, enabling seamless integration with third-party services.
- Configured and managed Docker containers for local development environments, streamlining team workflows.
- Performed Linux server administration tasks, including package management, user provisioning, and performance tuning.
- Installed, configured, and tuned Varnish and Nginx application servers to optimize caching and request throughput.
- Leveraged GitLab for source control and CI/CD, setting up pipelines to automate testing and deployment.
- Architected and implemented custom Drupal modules and themes to meet client-specific requirements.
Full Stack Developer
Cognity S.A
09.2021 - Current
- Lead the development, consistently ensuring high-quality results.
- Authored detailed technical design documents and created comprehensive task breakdowns, including man-day estimations and planning, to ensure efficient resource allocation and project execution.
Full Stack Developer
One Telecommunications
09.2021 - 10.2023
Full Stack Developer
Yettel Bulgaria
01.2022 - 09.2023
- Implement a back-office call center application for Yettel Bulgaria using Drupal 9 and PostgreSQL.
Full Stack Developer
FLIP new media
11.2018 - 09.2021
- Collaborated effectively within a team to develop, test, and debug web operations, ensuring high-quality deliverables.
- Handled both front-end and back-end development, specializing in platforms such as WordPress, Magento, and PrestaShop.
- Managed hosting servers and infrastructure.
Education
Diploma - Information and Communication Systems Engineering
University of the Aegean
Skills
- PHP
- JavaScript
- Drupal
- WordPress
- Docker
- MySQL
- PostgreSQL
- Java
- APIs
- Git
- Linux
- CSS proficiency
- JavaScript experience
Certification
- Microsoft Azure Fundamentals, 20 hours
- Microsoft Azure Administrator, 80 hours
- Project Future 6 ReGeneration Academy - DevOps, 100 hours
Languages
Greek
Native language
English
Advanced
C1
Timeline
Full Stack Developer
Yettel Bulgaria
01.2022 - 09.2023
Full Stack Developer
Yettel Bulgaria
10.2021 - Current
Full Stack Developer
Cognity S.A
09.2021 - Current
Full Stack Developer
One Telecommunications
09.2021 - 10.2023
Full Stack Developer
FLIP new media
11.2018 - 09.2021
Diploma - Information and Communication Systems Engineering
University of the Aegean
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