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Christian O.CO

Christian O.

PHP Developer

€600/day
Berlin, DE
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Christian

Hello dear clients,

I am Christian, 42, a developer from Berlin with a focus on PHP and over 15 years of professional experience. I have worked for or helped build from scratch companies like ABOUT YOU, Deinhandy.de, Momox / ubup (now Momox Fashion), kaufDA / Bonial, Xentral, and many others.

My focus is on developing custom applications, especially in the eCommerce environment: For Deinhandy.de (at the time Germany's highest-grossing mobile phone contract shop) and ubup.com (Germany's largest second-hand fashion shop, a brand of Momox), I built the online shops. For ABOUT YOU, I reconfigured the shopping system to be multi-tenant. For Neofonie GmbH, I helped shape the digitalization of pharmacies. For Xentral, I co-implemented the modular SAP competitor (focus: shop systems, tax). And for numerous small and large companies, I have implemented projects of all kinds.

I have extensive experience with Laravel and Symfony, and have also built my own micro-frameworks. I have been working with relational databases (MySQL, Postgres, MongoDB, ElasticSearch) for over 13 years and have worked with time-series data in the context of working with Grafana.

I can handle or develop REST APIs, and I have also worked with SOAP/XML interfaces. I have also been doing testing using Unit / Functional / Integration / Smoke tests (including frontend) and test and deployment pipelines for years.

I am, of course, reasonably proficient in the usual frontend technologies and have a lot of experience in DevOps (Docker, deployment pipelines, all major cloud providers, monitoring, etc.).

My hourly rate is currently €75 net.

Best regards
  • English

    Fluent

  • German

    Native or bilingual

Can work on-site
Berlin (up to 50km), Hamburg (up to 50km), Köln (up to 50km), München (up to 50km), Frankfurt am Main (up to 50km)

Experience

  • Flinkster (Deutsche Bahn Connect Gmbh)
    PHP Developer
    AUTOMOBILE
    July 2022 - July 2023 (1 year and 1 month)
    Halle (Saale), Germany
    For Flinkster, the car-sharing service of Deutsche Bahn, I managed the underlying PHP platform.
    PHP MySQL Docker JSON API PHPUnit
  • Xentral (Xentral ERP Software GmbH)
    PHP Developer
    SOFTWARE PUBLISHING
    November 2021 - April 2022 (6 months)
    Augsburg, Germany
    Xentral is the lean, modern, and cost-effective ERP, essentially the young SAP competitor. With €100M in funding, including from Frank Thelen. For Xentral, I integrate external eCommerce software/providers (Shopware, eBay, Amazon, Shopify, etc.) into the system. In parallel, we are modernizing the software from legacy PHP to a Laravel stack.
    PHP MySQL JavaScript Laravel
  • LoadBee (LoadBee GmbH)
    PHP Developer
    E-COMMERCE
    July 2021 - October 2021 (4 months)
    Stuttgart, Germany
    LoadBee enables manufacturers to edit their product information directly in large online shops or marketplaces. For LoadBee, I optimized the backend, with a focus on Elasticsearch queries.
    PHP MySQL Elasticsearch

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