Jan Markmann

AI-first Tech Lead for OCPI and interface topics in a Kotlin/PHP stack, combining hands-on backend work with technical leadership across integration, operations, and business requirements in the roaming domain.

• Owned OCPI and interface topics in the roaming domain and aligned technical decisions across Product, Ops, and Engineering.

• Implemented OCPI in a mixed Kotlin/PHP stack and translated backend, integration, and operational requirements into a maintainable production solution.

• Drove technical documentation for interfaces and operational requirements to reduce coordination overhead and support reliable implementation.

• Integrated coding agents and LLM-assisted workflows into day-to-day engineering to speed up implementation, technical documentation, and research.

• Tech: Kotlin, PHP 8, Symfony, Docker, Helm, Kafka, MariaDB, OpenAI Codex, Claude Code, OpenCode

Led DevOps, IT, and SysOps with both technical and line management responsibility and owned the platform's operational and delivery maturity. The role combined people leadership with hands-on platform engineering across CI/CD, container and Kubernetes operations, incident management, external providers, and security-related operational topics.

• Led a DevOps, IT, and SysOps team of up to 8 with technical and line management responsibility, including coaching, prioritization, hiring support, and stakeholder management.

• Built and evolved CI/CD and deployment standards with GitLab and TeamCity to improve release reproducibility and operational reliability.

• Established incident management and operational routines for SLA-relevant systems to shorten the path from alert to coordinated response.

• Built, migrated, and operated Docker stacks and Kubernetes/Helm setups while documenting the target architecture for ongoing platform operations.

• Owned security-related operational and policy topics, managed external providers, and structured collaboration across operations, IT, and security.

• Tech: PHP 8, Symfony, Caddy, Docker, Helm, Kubernetes, GitLab, Renovate, TeamCity, Ansible, Harbor, Linux, Backstage

Combined hands-on backend and platform engineering with first formal People Lead responsibility. Alongside implementation work, the role focused on technical ownership, delivery, operability, and the development of individual team members.

• Drove backend and platform topics in a PHP/Symfony environment and took technical ownership within the team.

• Took People Lead responsibility for individual team members, including 1:1s, feedback, development conversations, and day-to-day support.

• Moved deployments to Docker and introduced Ansible-based infrastructure and operational workflows to improve delivery and operational maturity.

• Bridged Product, Ops, and Engineering on delivery and operational topics and helped structure implementation across teams.

• Tech: PHP 8, Symfony, Caddy, Docker, GitLab, TeamCity, Ansible, Linux

Developed and operated components in a Kubernetes-based microservice architecture focused on object storage, document generation, platform integration, and observability.

• Implemented a multi-tenant S3 storage solution as a reusable platform building block, including provisioning Kubernetes and MinIO resources from Symfony.

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

• Set up Grafana on top of Graylog data and made reliability metrics visible to improve operational transparency and earlier problem detection.

• Tech: PHP 7, Symfony, Docker, Google Cloud Run, Kubernetes, MinIO, Rancher, GitLab, InfluxDB, Grafana, Graylog

Served as interim head of IT and consultant with a focus on IT/DevOps tooling, hiring support, delivery standards, and infrastructure consolidation. Also took over and stabilized Shopware 6 on AWS.

• Served as interim head of IT and helped shape hiring for SysOps and development roles.

• Built a reliable development and DevOps foundation for a junior Shopware team, including Docker, GitLab CI, and review apps.

• Built and integrated APIs based on REST and GraphQL, including MongoDB.

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

• Consolidated and standardized local and external IT infrastructure to make it easier to operate and maintain.

• Tech: PHP 7, 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.

• Introduced or improved DevOps tooling and CI/CD workflows in project teams.

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

• Enhanced internal applications for sales and process control in line with business needs.

• Implemented and adapted Spryker-based e-commerce requirements.

• 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, combining technical direction with hands-on execution.

• Technical and disciplinary leadership of the software engineering team, with responsibility for technical priorities and delivery.

• Introduced and evolved agile practices (Kanban, Scrum) and embedded them in the team.

• Kept the legacy platform stable and moving while preparing the transition to a new target architecture.

• Designed and built a new service-oriented sales platform as the technical replacement path out of the legacy system.

• 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 within the Enterprise Feedback Suite.

• Built a social media monitoring application including API integrations.

• Implemented JSON-RPC and SOAP web services and integrated them into the existing system landscape.

• 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

Business Information Systems studies (no degree completed)

State-certified IT Assistant, advanced technical college entrance qualification