Jan Markmann

Owned DevOps, IT, and SysOps with a focus on automation and information security. Led a team of up to 8 and coordinated external providers. Designed and operated container and Kubernetes platforms including CI/CD and infrastructure automation (GitLab, TeamCity, Ansible). Since 2025-11: Tech Lead in the Roaming domain, owning the technical scope across roaming topics and implementing the OCPI protocol.

• Tech Lead in the Roaming domain; owning the technical scope across roaming topics in collaboration with Product, Ops, and Engineering.

• Implementing the OCPI protocol in a mixed Kotlin/PHP environment (incl. Helm/Docker and Kafka-based integration patterns).

• Led a DevOps/IT/SysOps team (up to 8) with technical and disciplinary responsibility, including coaching and stakeholder management.

• Built and improved CI/CD with GitLab and TeamCity and standardized release and deployment processes.

• Established incident management and monitored SLA-relevant systems (availability, resources, alerting).

• Designed, migrated, and operated Docker stacks and Kubernetes/Helm setups and documented the target architecture.

• Co-owned information security topics, including policies and compliance-adjacent processes, and coordinated external providers.

• Tech: PHP, Symfony, Caddy, Docker, Helm, Kubernetes, GitLab, Renovate, TeamCity, MariaDB, Uptime Kuma, Ansible, Harbor, Backstage, Linux

Worked on components in a Kubernetes-based microservice architecture. Focus areas: object storage (S3/MinIO), document generation, and observability.

• Implemented multi-tenant S3 storage provisioning, controlling Kubernetes cluster/MinIO from Symfony.

• Built a PDF document generator for product data sheets within an e-commerce microservice architecture.

• Built a Grafana setup using Graylog data and monitored reliability metrics.

• Tech: PHP7, Symfony, Docker, Google Cloud Run, Kubernetes, MinIO, Rancher, GitLab, InfluxDB, Grafana, Graylog

Interim head of IT and consultant focused on IT/DevOps tooling and processes, hiring support, and infrastructure consolidation. Took over and operated Shopware 6 hosting on AWS.

• Interim head of IT and support in recruiting (IT lead SysOps/Dev).

• Set up development and DevOps tooling for a junior Shopware team (Docker, GitLab CI, review apps).

• API work and integrations (REST/GraphQL) including MongoDB.

• Took over and operated Shopware 6 hosting on AWS (EC2).

• Consolidated and standardized local and external IT infrastructure.

• Tech: PHP7, Shopware, Symfony, AWS, Caddy, Docker, GitLab/GitHub, MongoDB, Linux

Worked on an internal graph-based database system with a focus on data and process modeling. Also delivered industrial automation prototypes with Raspberry Pi and Python.

• Enhanced the internal graph database system (backend and domain model).

• Built and maintained APIs and integrations (GraphQL).

• Data and process modeling within the graph-based system; implemented process flows.

• Industrial automation prototyping with Raspberry Pi and Python (async) incl. fieldbus (Modbus/RS-485).

• Tech: GraphQL, PHP7, Python (async), Symfony, GitLab, Modbus/RS-485

Freelance work in agency and enterprise environments, including e-commerce and DevOps. Focus: Symfony/PHP, integrations, and service-oriented architectures.

• Set up DevOps tooling and improved CI/CD in project teams.

• Supported delivery and quality assurance in an enterprise client project team within an agency setup.

• Enhanced internal applications for sales and process control.

• Spryker development and customization.

• Built REST APIs to connect satellite projects, including data export to an ERP system.

• Tech: Doctrine, PHP7, PHPUnit, Spryker, Symfony 3.x, GitLab, MySQL, PostgreSQL, RabbitMQ, Redis, Propel

Led software engineering: maintained a legacy platform and designed and built a new service-oriented sales platform. Introduced agile practices and strengthened QA, CI, and DevOps standards.

• Technical and disciplinary leadership of the software engineering team.

• Introduced and evolved agile practices (Kanban, Scrum).

• Maintained and improved a legacy platform with a focus on stability and delivery.

• Designed and built a new service-oriented sales platform.

• Tech: Doctrine, PHP5, PHPUnit, REST/SOAP, Symfony2, GitHub, Travis CI, MongoDB, MySQL5, Redis, Jira, Zend Framework

Maintained and extended an enterprise feedback suite and developed new components. Also built a social media monitoring application.

• Developed new product components and modules.

• Built a social media monitoring application including API integrations.

• Implemented web services (JSON-RPC, SOAP) and integrations.

• Maintained and extended the Enterprise Feedback Suite.

• Tech: PHP5, Symfony Components, Hudson/Jenkins, Social Media APIs, MySQL5, Assetic, Zend Framework

Freelance project work as software developer and consultant focused on PHP/MySQL and symfony 1.3–1.4.

• Project work as software developer and consultant.

• Tech: Java, PHP5, symfony 1.3–1.4, MySQL, Eclipse/OSGI, ezComponents, Linux, Smarty, Typo3, UML

Senior engineering and team leadership in an agency environment, focusing on portal and platform development in cross-functional teams.

• Team and development lead in agency web projects.

• Built portals for the tourism industry.

• Built a product catalog for providers of security and surveillance technology.

• Tech: PHP5, Symfony, MySQL5, Internet-Booking-Engines, Propel, Zend Lucene Search

Worked on a news aggregation portal, enriching content with metadata (including geographic data) and delivering partner integrations.

• Built and enhanced a news portal for aggregation and presentation.

• Implemented metadata enrichment (notably geographic) and partner embedding.

• Tech: CakePHP, PHP5, MySQL5, AJAX, Drupal, jQuery, Netvibes UWA

Software development for enterprise and mid-sized clients, including Epson Germany.

• Software development for enterprise and mid-sized clients, including Epson Germany.

• Built a printer leasing system.

• Built and maintained a product database.

• Tech: PHP5, Symfony, MySQL5, Propel, Zend Lucene Search

Diploma (no degree)

State-certified IT Assistant, advanced technical college entrance qualification