Hossein
Koozehgar

Senior Backend Engineer

17+ years designing and building scalable backend systems. Specialized in PHP ecosystems (Laravel, Symfony), API development, and bringing order to complex legacy codebases.

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HK
Berlin, Germany
17+years exp.
6companies
3countries
PHPprimary lang

technical skills

languages
PHP JavaScript
frameworks
Laravel Symfony Zend Express
databases
MySQL PostgreSQL MongoDB Redis
devops & tools
Docker Kubernetes Git CI/CD Bash
architecture
RESTful API TDD DDD SOLID MVC
messaging
RabbitMQ Kafka

experience

Senior Software Engineer GIATA GmbH — Berlin
May 2024 – Present ▼
  • Designed centralized data aggregation system integrating multiple XML and JSON sources
  • Modernized core matching applications, refactored legacy code with comprehensive unit test coverage
  • Contributed to Kubernetes migration and automated CI/CD via Bitbucket pipelines
  • Designed new matching engine module supporting apartment and real estate datasets
  • Implemented specialized RESTful endpoints for large-scale MySQL datasets with complex multi-filter retrieval
Senior Software Engineer InstaFreight — Berlin
Aug 2022 – May 2024 ▼
  • Enhanced backend performance by optimizing key workflows in Phalcon-based services
  • Led carrier vetting, tax calculation enhancements, and blocked date optimization for transport planning
  • Introduced automated testing and refactored legacy modules to improve code quality
  • Developed credit note consolidation and bi-weekly factoring processes
Senior Backend Developer Teknasyon — Istanbul
Jun 2021 – Aug 2022 ▼
  • Developed reusable Laravel package for logging and error tracking across multiple applications
  • Simplified purchase process and introduced Swagger API documentation platform-wide
  • Built and tested purchase processor API to analyze Apple and Google in-app purchase behaviors
Senior Backend Developer Estonian Gaming Company — Remote
Oct 2020 – Jun 2021 ▼
  • Designed RESTful APIs for microservices supporting the company's gaming platform
  • Developed multi-currency payment system with Bitcoin support via Block.io
Senior Backend Developer Pars Parva Systems — Tehran
May 2016 – Sep 2020 ▼
  • Led backend development of DL-Hosting, File Manager, and Newsletter services
  • Integrated VEEAM Backup Solution for cloud server management and backup automation
  • Improved SSL service integration with new issuer APIs and developed internal tooling
Head of Development Imen Samaneh Sepehr — Tehran
Dec 2007 – May 2016 ▼
  • Progressed from frontend developer to Technical Manager at Iran's leading CMS provider
  • Directed development of ACL, Multimedia Manager, Photo Album Creator, and Publication Manager modules
  • Modernized legacy systems, implemented mobile API integrations, and mentored new developers

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work status EU Blue Card holder