28.01.2026 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

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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