13.10.2026 aktualisiert

**** ******** ****
100 % verfügbar

Software Engineer / DevOps Engineer

Würzburg, Deutschland
Würzburg +250 km
Diplom Informatik (mit Prädikat)
Würzburg, Deutschland
Würzburg +250 km
Diplom Informatik (mit Prädikat)

Profilanlagen

Zirker_CV.docx
Zirker_CV.pdf

Über mich

- Fullstack: Backend, DevOps, Architecture, Auth, Keycoak, Search, Frontend. - Multi-ecosystems: Java (Spring Boot) & JavaScript (Node.js, SPA). - Proficient in Kubernetes and Cloud technologies (AWS, GCP). - Efficient in use of AI tools (Codex, Claude Code, Junie).

Skills

OAuth 2.0KeycloakOIDCHelmGCPProxmoxJavaScriptAmazon S3ArchitekturAtlassian JiraHTML5Test AutomationCloud ComputingContinuous DeliveryLinuxDevOpsDNSAmazon DynamoDBElasticsearchE-Mail-ManagementHypertext Transfer Protocols (HTTP)JUnitPostgreSQLApache MavenNode.jsScrumRabbitMQPrometheusSingle Sign-OnAmazon Simple Notification Service (SNS)Apache SolrWeb Application DevelopmentWebSocketFluentdGrafanaSpring BootAWS LambdaVue.jsBackendGitLabKubernetesRestful ApisTerraformAWS EKSDockerMicroservices
Languages: Java, JavaScript, TypeScript, Groovy, various templating
Infrastructure: Kubernetes, AWS (EKS, SNS, EC2, Lambda, ...), GCP, ELK, ElasticSearch, Prometheus, Grafana, Docker, Terraform, IaC, helm, FluentBit, fluentd, Linux, proxmox, Gateways, networks, Calico
Architecture: Lean, Microservices, API Design, Code Reviews, OOAD, UML, Design Pattern, Security
Databases: SQL, PostgreSQL, MySql, DB2, Liquibase, JPA, Hibernate, ORM, MyBatis, DynamoDB, S3, MongoDB
Backend: Spring Boot, Node.js, Express, MVC, Quarkus
Frontend: HTML5, CSS3, Vue.js, SPA, tailwind, jQuery, Templating, Velocity, JSP, AB Testing, PWA
Tools: GitLab, GitHub, CI/CD, Jenkins, Maven, Gradle, pnpm
Testing: TDD, BDD, Selenium, TestCafe, Mockito, JUnit, TestNG, AssertJ, Jest, JMeter
Networking: HTTP, TCP/IP, DNS, WebSockets, Firewall, Proxy
Auth: Keycloak, OIDC, OAuth2, JWT, 2FA, SAML, OTA
Search: Solr, Lucene, OpenSearch
Methodologies: Agile, Scrum, Kanban, Pair Programming, Coaching
Products: RabbitMQ, AMQP, SonarQube, Tyk, Nginx, Matomo, Confluence, Jira, Zapier, HubSpot
AI: Junie, Claude Code, Codex, OpenClaw

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2017

Sprachen

DeutschMutterspracheEnglischverhandlungssicherFranzösischgut

Projekthistorie

Fullstack Software Engineer & DevOps Engineer

Arcomplish GmbH

Automobil und Fahrzeugbau

  • Telemetry data provisioning to partners within automotive industry, including auth and access management.
  • Tech: Java 21, Spring Boot 3, Gradle , Kubernetes, Calico, Quarkus, MongoDB, PostgreSQL, Keycloak, OIDC, TypeScript, Vue.js, Tailwind, Vite, Claude Code, OpenSearch, FluentBit, GitLab, AWS, Terraform, Helm, IaC

Software Engineer & DevOps Engineer

Zirker Software Engineering

Banken und Finanzdienstleistungen

< 10 Mitarbeiter

  • Created an automated trading system based on TradingView signals.
  • Features: Configurable times and amounts per asset, tax export,custom Geo-IP for servers for each integrated crypto exchange.
  • Tech: GCP (Cloud Run, Functions, VPC, NAT, Router, GCR, DNS, gcloud), GitHub, Node.js, API integration of exchanges, TradingView, Webhooks, Serverless, JavaScript, proxmox, AI, LLM, Ollama, codex, OpenClaw

Software Architect & Lead Developer

CONET ISB GmbH

Öffentlicher Dienst

250-500 Mitarbeiter

  1. Smarte Schulverwaltung Niedersachsen: Ramping up a 10 years governmental project as part of the architecture team.
  2. Created the auth system using Keycloak. Created a vue.js component using OIDC. Prototypical integration of third-party user sources using SAML or OIDC brokering. Integrated backend by coding a Keycloak extension.
  3. Created a self-healing distributed logging system using OpenSearch and FluentBit, that works both with docker-compose and Kubernetes. Created logging lib for each project language. Architectural documentation.
  4. Set up, documented and managed inhouse Kubernetes clusters using K3s
  5. Tech: Java, JavaScript, Vue.js, PostgreSQL, Flyway, DDD, Jenkins, Helm, Kubernetes, Shell, OpenSearch / ElasticSearch, Kibana, FluentBit, FluentD, Keycloak (SPI), IAM, OAuth2, OIDC, ADFS, K3s, WSL, SSO

Lead Backend Developer & DevOps Engineer

Medflex GmbH

Internet und Informationstechnologie

10-50 Mitarbeiter

  1. Architecture, development, launch, CD-pipelines and operation of a medical messengers based on AWS and JavaScript
  2. Transforming a project, embedded in another company's infrastructure (coliquio GmbH), into a dedicated company with independent tech stack
  3. Integrated 3rd party products: Hubpot, MailJet, Sendinblue, Vonage, Stripes, Matomo, Zapier
  4. Supporting a certification process and migrating from AWS to OVH cloud
  5. Tech: AWS, OVH, DynamoDB, S3, SNS, EKS, Route53, EC2, Serverless, Lambda, Kibana, Grafana, Node.js, Express, Jest, TypeScript, npm, REST, WebSockets, Swagger, Plotly, Docker, Kubernetes, Calico, Helm, Terraform, Prometheus, Grafana, GitLab, Postman, OIDC, Keycloak, Tyk, RabbitMQ, AMQP, Microservices, MongoDB, React, PWA, Jira, Confluence

Senior Software Engineer

Mercedes Benz Group AG via Inno-Tec Innovative Technology GmbH

Automobil und Fahrzeugbau

>10.000 Mitarbeiter

  1. Digital Vehicle Scanner: taking 360° pictures and capturing axis and tire data during drive-through
  2. Design and implementation of the scan process logic; communication with the given hardware. Bringing into service two kind of scanners: A drive-through solution for trucks in Augsburg and a parked car scanner on Mercedes' factory premises.
  3. Tech: Java, Spring Boot, Swagger, CouchDB, PostgreSQL, JPA, Docker Swarm, Microservices, Keycloak, State machines, Bash/Shell, Azure, MinIO, Maven, Artifactory, Hardware drivers, WuT

Head of Backend Development

Chrono24 GmbH

Internet und Informationstechnologie

50-250 Mitarbeiter

  1. World’s largest marketplace for luxury watches
  2. Software engineering from ideation to operation
  3. Co-created deployment system and co-operated production system
  4. Introduced automated browser testing and static code analysis (QA process)
  5. Disciplinary & technical lead of two teams plus freelancers. Recruitment.
  6. Tech: Java, Spring, MyBatis, MySQL, Stripes, JSP, HTML, jQuery, MangoPay, WordPress, Jenkins, Groovy, TDD, BDD, Browser Tests, Geb, Selenium, JMX, SonarQube, Optimizely, ABTasty, Solr, REST, XML, Mockito, Git, Ant, Maven

Senior Software Engineer

Yellow Pages Group

Internet und Informationstechnologie

250-500 Mitarbeiter

  • Backends integration project in a distributed architecture
  • Development of Webservices (both REST und SOAP)
  • Migration of the billing process to the new software system
  • Tech: Java, Spring, MyBatis, Jersey / JAX-RS, Camel, JMS, Maven, SOA, SOAP, REST

Senior Software Engineer

Netpioneer GmbH

Internet und Informationstechnologie

50-250 Mitarbeiter

  1. Software development within several Scrum projects
  2. Project randstad.de (2 years, 10 people)
  3. Re-launch site, CMS and job exchange of Germany’s biggest agency for temporary work, including search and bidirectional integration of SAP
  4. Tech: Java, Spring, Polopoly, HTML, CSS, jQuery, SAP BI, SOAP, Lucene
  5. Project damodo.com (1¼ years, 4 people)
  6. Start-up of a P2P-marketplace for digital media with dedicated credit system
  7. Tech: Java, Spring, MySQL, Jenkins, AWS, Fitnesse, jQuery, PayPal, Maven, UML, Nexus, arc42

Software Developer

Friedrich Schiller University of Jena, Department of Finances
  • Developing a university internal marketplace for the trade of technical inventory. Requirment analysis. Techs: LAMP stack (Linux Apache MySQL PHP)

Zertifikate

SCJP

Sun / Oracle

2010

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