12/08/2025 updated

**** ******** ****
40 % partially available

Backend Entwickler Java/Kotlin, Spring Boot, Continuous Delivery

Amel, Belgium
Only remote
Diplom Informatiker (FH)
Amel, Belgium
Only remote
Diplom Informatiker (FH)

Profile attachments

cv_nils_rommelfanger_2025.pdf

Clean Code PrinciplesJava (Programming Language)ArchitectureTest AutomationUnit TestingSoftware QualityContinuous DeliveryContinuous IntegrationDevOpsSpring FrameworkJUnitMockitoSoftware EngineeringData/Record LoggingSpring BootBackendKotlinKubernetesDomain Driven DesignCode RefactoringDocker
My main skills are backend development with Java / Kotlin und Spring Boot, Unittesting with JUnit and Mockito, Clean Code, Refactoring of legacy Code and Application Logging / Distributed Tracing.
Besides that I count my sense for quality software and the cost efficiency that comes with it to my strengthes. In my opinion high software quality enables cost efficient software development. Real continuous integration i.e. trunk based development and reliable automated tests are key techniques to achieve high software quality as shown by the DORA reports and the Accelerate book by Nicole Forsgren, Jez Humble, Gene Kim.
I am also interested in topics beyond pure software development like architecture, CI/CD, Kubernetes, IAC and cloud.
Ideally I take responsibility for the software in production in thr original sense of DevOps. I.e. you build it you run it. Therefore good observability of the software in production is also one of my main concerns.

Experience

Professional experience10+ years
Freelancer since2025

Languages

GermanNative speakerEnglishFluent

Project history

Senior Backend Software Engineer

Actico

Banking & Financial Services

250-500 team member

Backend Development Java 17, SpringBoot, Rest, Junit, Mockito, Postgres, Mapstruct, Kubernetes, Jenkins, CI/CD,
100% remote
Banking Compliance Sector

Backend Development Java/Kotlin Kafka

beyonnex.io

Energy, Water & Environment

50-250 team member

- Maintenance of the event driven microservices (Spring Boot, Java/Kotlin, Kafka)
- Desingning and implementing multi tenancy
- Participation in the architecture community of practice
- Improving Observability i.e. logs and adding distributed tracing (Open Telemetry)
- One hour knowledge nugget about application logging

Backend development for a social casino

Ously Games GmbH

Internet & IT

10-50 team member

Maintenance and feature development using Spring Boot, Redis, RabbitMQ, MySQL, Junit, Mockito

Development of an online navigation for mobile warehouse robots

Morgenwerk GmbH

Industry & Mechanical Engineering

< 10 team member

Development of an online algorithm to plan conflict free routes in warehouse with storage densities >99%.

- Kotlin
- Spring Boot
- JUnit, Mockito
- AWS IOT
- MQTT
- Github Actions

Backend Software Develepment Java, Kotlin, Golang

Gamomat Development GmbH

Internet & IT

250-500 team member

Development and maintenance of a slot game engine for the iGaming industry

- Java, Kotlin, Golang
- Tomcat Application Server
- AWS
- MongoDB

Backend Development Java/Kotlin

Clevershuttle

Transport & Logistics

10-50 team member

- Maintenance and Development of the microservice
- Mentoring for junior developers
- Migration of the unit tests from Java to Kotlin
- CI/CD Github Actions

Backend Development Bosch Semantic Stack

Bosch.IO

Internet & IT

50-250 team member

- Backend devleopment (Spring Boot, Kubernetes, AWS Neptune, Sparql, RDF)

Backend development Bosch IoT Suite Portal

Bosch.IO

Internet & IT

50-250 team member

- Maintenance and development of the Bosch IoT Suite Portal (Spring Boot, Thymeleaf)
- Maintenance of the infrastructure in AWS (EC2, Beanstalk, Kubernetes, RDS)
- Implementation of organisations and teams feature to manage access to the service subsrcriptions
- Operations and support
- CI/CD (Jenkins Pipelines)

Central authorization server for Bosch IoT Suite (Oauth2)

Bosch.IO

Internet & IT

250-500 team member

- Designing an authorization model for the services of the Bosch IoT Suite with Keycloak
- Implementation of an ApI for the services to manage the service subscriptions and the OAuth2 clients
- Provisioning of a Kubernetes cluster with EKS, Terraform
- In depth security with Kubernetes internal Certificate Authority
- Integration of user management of the Bosch IoT Suite
- CI/CD (Jenkins Pipelines)

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