02.08.2026 aktualisiert

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Senior Cloud Developer | Architect | Java, Kotlin, Spring, GCP

Hamburg, Deutschland
Nur Remote
B. Sc. Wirtschaftsinformatik
Hamburg, Deutschland
Nur Remote
B. Sc. Wirtschaftsinformatik

Skills

Clean CodeJavaSpring SecurityDevOpsHibernateSpring FrameworkPostgreSQLMongoDBPrometheusSwaggerSQLTypeScriptOpenapiGoogle CloudTest-Driven DevelopmentGrafanaSpring BootGitLabSpring DataKotlinKubernetesApache KafkaGraphQLTerraformDomain Driven DesignDockerMicroservices
Fokus: Java, Kotlin, Spring, DevOps, MongoDB, PostgreSQL, Open API, Architecture, Docker, Kubernetes, Cloud, Terraform, GitOps, Google Cloud (GCP), Microservice
Way of working: strukturiert, eigenständig, mit- und weiterdenkend.

Auszug aus meinem Techstack (Vollständige Liste im CV)

Programmiersprachen / Expressive Sprachen
Kotlin, Java, Typescript, SQL, Python, Java Server Pages (JSP), HTML, CSS, Markdown, AsciiDoc

Methodologies & Patterns
Clean Code, Clean Architecture, Microservices, Ports & Adapters Architecture, Domain Driven Design (DDD), Test Driven Development (TDD)

You build it, you run it!
DevOps, GitOps, Grafana, Prometheus, Datadog, InfluxDB, Log Analyse, Performance Optimization

Technologies / Frameworks
Spring: Spring, Spring Boot, Spring Native, Spring Security, Spring Cloud, Spring Web, Spring Data
Others: GraphQL, Quarkus, PostgreSQL, Keycloak,  ElasticSearch, OAS, Swagger, OpenAPI, Kafka, OpenAI, ChatGPT

Platform Engineering & GCP
Docker, Terraform, FluxCD, Helm Charts, GitHub Actions CICD, GitLab CICD, Google Kubernetes Engine, Cloud Run, SQL, Kubernetes, PubSub

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2024

Sprachen

DeutschMutterspracheEnglischverhandlungssicher

Projekthistorie

Senior Java/Kotlin Software Engineer & Architect

Architektur und Bauwesen

< 10 Mitarbeiter

Techstack: Kotlin, Java, Spring Boot, DevOps, MongoDb, PostgreSQL, Kafka, Grafana, Prometheus, Domain-Driven-Design (DDD)
  • Setup and implementation of various microservices for a real estate b2b2c platform
  • Implementation of a Backend-for-frontend microservice with Spring Boot and GraphQL
  • Implementation of a Listing microservice, that serves as a backend for real estate and digital-twin family home listings
  • Implementation of a generic backend model for a dynamic frontend form (-field) builder (Frontend as a config)
  • Configuration of 2 domain models, 1 for Real Estate platform listings/ads (e.g. Immoscout24) and 1 for building renovation for customer audience “energy consultants”
  • Implementation of a Poi SAAS to locate geographic Points-Of-Interest nearby a given lat/lon location within a custom-built “Geo-microservice”. Integration of Apple Maps for (Reverse-) Geocoding.
  • Implementation of a 3D digital twin backend model for family homes, implementation of IFC- & GbXML
  • Implementation of OpenAI API (Chat GPT) to generate real estate location- & object descriptions
  • Implementation of a serverless Spring Boot Native Billing microservice, serving as a backend to track listing monetization and billing-report generation
  • Setup & operation of User management and authentication using Keycloak and custom-built UserProfile microservice

Senior Java/Kotlin Software Engineer

Architektur und Bauwesen

500-1000 Mitarbeiter

Techstack: Java, Spring, PostgreSQL, Pub/Sub, Terraform, GitLab, Google Cloud Platform (GCP)
  • Implementation of a Portal Export application, that exports real estate listings to real estate portals
  • Implemented datamodel- & data migration to work with a new in-house Listing CRM
  • Refactoring of multiple microservices of that product with Pub/Sub in between into a modular monolith
  • Seamless golive & cutover in revenue critical system
  • Setup of a DevOps strategy using Datadog dashboards & -monitors as well as Slack & mail alerts
  • Maintenance of per-team CICD GitLab pipeline using helm chart
  • Initiative to upgrade dependencies to latest versions (Spring, JVM, etc.)

Google Cloud Platform Engineer

Architektur und Bauwesen

< 10 Mitarbeiter

Techstack: Terraform, FluxCD, Helm Charts, Google Cloud Platform (GCP), GitHub Actions, Prometheus
  • Responsible for GCP Platform Setup & operation of microservices
  • Entire e2e platform stack including TLS & DNS setup in Cloudflare, SPA setup, Loadbalancer, Cloud Storage, Kubernetes, Prometheus, etc.
  • Creation of a DevSecFinOps strategy to roll out and operate code quickly, securely and cost-effectively
  • Selection and purchase of Cloud- and IT infrastructure
  • Operation and configuration of Keycloak for user- and authentication management
  • Setup of monitoring and alerting strategy, preparing for 24/7 On-Call-Duty support
  • Frequently run OWASP 10 security checks as well as Cost governance using budget alerts and quota limits; DevOps

Senior Java/Kotlin Developer

Architektur und Bauwesen

50-250 Mitarbeiter

Techstack: Kotlin, Java, Spring Boot, MongoDb, Prometheus, Kubernetes, Docker, Domain-Driven-Design (DDD)
  • Green field project for creating a Construction Project Costs Configurator, including Customer Offerprice Calculator as a web app self service tool, including margin-, net-, gross- and vat calculation
  • Designed and implemented a 2-in-1 backend for internal cost configuration and customer offer pricing, based on DIN 276 and VOB/A.
  • AirTable importer to define basic model contents and create versioned databases to be adapted be the backoffice enduser
  • Deployed as a Kubernetes workload in Google Kubernetes Engine using Flux CD (GitOps)
  • Strong collaboration with the customer, end 2 end lifecycle project, many workshops etc.

Principal Java/Kotlin Software Engineer Checkout & Payment

MediamarktSaturn Retail Group

Konsumgüter und Handel

500-1000 Mitarbeiter

Techstack: Kotlin, Java, Spring Boot, DevOps, Clean Code, MongoDb, PostgreSQL, Kafka, Grafana, Prometheus, Domain-Driven-Design (DDD)
  • Implementation of a new infrastructure for the checkout in the GCP with a solution based on GitOps technologies such as Terraform, Helm, GitHub Actions, Secrets, etc.
  • Cloud cost optimization for the company in 6-digit € area
  • Implementation of a blueprint for Consumer Driven Contract Testing with Pact for envisioned later company rollout
  • Sparring partner for competency leads and team colleagues of the domain as well as consulting for architecture- and concept questions
  • Performing technical interviews and selection of suitable candidates for 5 teams (ad interim)
  • Initiator and co-founder of a gremium for consulting and democratic decision-making of software development process concerns on company level

Keywords: GitOps on Google Cloud Platform (Terraform Enterprise, Helm, GitHub Actions, GCP Cloud Run,
Kubernetes, GKE Autopilot, Secret Manager, Secrets, InfluxDB, Grafana), Pact Framework

Lead Java/Kotlin Engineer Onlineshop Checkout

MediamarktSaturn Retail Group

Konsumgüter und Handel

500-1000 Mitarbeiter

Techstack: Kotlin, Java, Spring Boot, Clean Code, DevOps, MongoDb, PostgreSQL, Kafka, Grafana, Prometheus, Domain-Driven-Design (DDD), Hexagonal Architecture
  • Technical accountability and leadership for the checkout backend microservice, a backend for all checkout pages incl. basket- and vat calculation, grossing more than € 5 bn. a year in the GCP
  • Techn. concept, alignment and implementation of a "Buy Online & Ship From Store" solution
  • Established a new learning culture in a team of 5 by introducing pair programming & TDD, ADRs and clean coding guidelines living well-known principles like SOLID, KISS and YAGNI
  • Ensured frictionless production deployments by introducing Canary Releases with help of Istio + Flagger
  • Introduction and gradual migration of the codebase to Kotlin
  • Short-notice project work in business-critical cross-domain projects to secure the company roadmap goals
  • Reporting to Chapter Lead and Vice President

Keywords: REST, OAS 3, Open Api Generator, Spring, Spring Boot, Java 8-17, Kotlin, Cloud Atlas MongoDB, PostgreSQL, Quarkus, Resilience4j, Micrometer, JWT, Kubernetes, GCP, Junit 5, Mockito, Mockk, AssertJ, Spring Test,
Maven, Grafana, Prometheus, Flagger, Canary Releases, Istio, Helm
Other: High Traffic up to 20k req/s, Microservices, API first, Domain Driven Design, Hexagonal Architecture,
Clean Coding, SOLID, YAGNI, Jira, Confluence, Scrum, IntelliJ, OpsGenie, Postman, GitHub

Senior Java/Kotlin Software Engineer Onlineshop Checkout

MediamarktSaturn Retail Group

Konsumgüter und Handel

500-1000 Mitarbeiter

Techstack: Kotlin, Java, Spring Boot, Clean Code, DevOps, MongoDb, PostgreSQL, Kafka, Grafana, Prometheus, Domain-Driven-Design (DDD), Hexagonal Architecture
  • Relaunch of the Onlineshop Checkout backend as a Java microservice in the GCP with hexagonal architecture and DDD to ensure maintainability for the future
  • Created and implemented concept for Fault-Tolerance and application resilience with resilience4J + caching in MongoDB to stay up online even under certain worst-case scenarios
  • Setup Grafana Dashboards, InfluxDB and Opsgenie for our project to provide a wide spectrum of monitoring capabilities for smooth productive operation and alerting in case of incident
  • Split decision and initialization of 2 more microservices in the OrderManagement domain to keep out the "order" and "order number" context from the "checkout" context
  • Reporting to Chapter Lead

Tech: REST, Swagger Codegen, Spring, Spring Boot, Java 8, Cloud Atlas MongoDB, Resilience4j, JWT, Kubernetes, GCP,
Junit, Mockito, AssertJ, Spring Test, Maven, Grafana, InfluxDB
Other: Microservices, API first, Domain Driven Design, Hexagonal Architecture, Jira, Confluence, Scrum, IntelliJ,
OpsGenie, Postman, Git Hub

Java Software Engineer

Novomind AG

Internet und Informationstechnologie

250-500 Mitarbeiter

Techstack: Kotlin, Java, Spring Boot, Clean Code, DevOps, MongoDb, PostgreSQL, Kafka, Grafana, InfluxDB
  • Introduction of microservices with Docker, Rancher and Kubernetes with the concept of Self-Contained Systems
  • Architecture and implementation of medium sized microservice projects, taking role as lead engineer and sparring partner for other colleagues joining these projects at later stages
  • First to introduce architectural concept of Domain Driven Design to customer projects' foundation architecture on microservices

Software Engineer - Java

KGU Consulting GmbH

Industrie und Maschinenbau

  • Mandatory internship for university, afterwards taken over as a working student for 20h per week
  • Various Customer projects of different volume and business sectors
  • Fullstack Java Eclipse RCP Developer for a big Siemens Teamcenter PLM based rich client CMS solution
Tech: Java, Eclipse RCP, SWT, JFace, MVC, 3 Tier Architecture, Ant, SVN, Git, Siemens Teamcenter PLM

Zertifikate

CPSA-F Certified Professional for Software Architecture

ISAQB

2016

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