Senior Backend Developer Java, safety-relevant system in railway environment, CENELEC

Project overview

A large railway company is automating the warning of passengers on platforms about passing and arriving trains. Currently, this is done by people via announcements. The new system automatically detects from timetable, train route, and location data when a warning needs to be issued at an operating site and triggers the announcement in time. The project starts from scratch, architecture and code are being created anew. The system is safety-relevant and will be developed according to CENELEC (EN 50126 / EN 50716), from requirements through verification and validation to configuration management.

Work is carried out in a self-organized agile team distributed across Germany.

Your Role

As a Senior Backend Developer, you will build the core components of an event-driven system that people on the platform rely on every day.

Specifically:

What You Bring

Advantageous

Framework Conditions

Before project start, an unpaid ramp-up phase of approximately five days for project-specific training must be scheduled.

Interested?

Send me your CV (Word or PDF) and your hourly rate to *@*.de.

You will receive feedback promptly.

Jochen Gierl

Codex Solutions GmbH

Data Protection Notice

If you apply for this position, we will process the personal data you provide (e.g., name, contact details, qualifications, CV, availability, remuneration rate) for the processing of your application and for contract initiation in accordance with Art. 6 para. 1 lit. b GDPR. Further information on the processing of your data can be found in our privacy policy at: www.codex-solutions.de/DSE

• Development of technical components with Java and Spring Boot, event sourcing with the Axon Framework and NATS as a messaging broker, including interfaces, modules, and databases
• Development and operation in a cloud-native environment (Kubernetes/OpenShift, AWS), Infrastructure as Code with Pulumi
• Setup and maintenance of CI/CD pipelines with GitLab CI/CD
• Observability of components with Grafana, Prometheus, and Tempo (metrics, logs, traces)
• Automated tests (unit, integration, and component tests) and bug fixing from test phases
• Technical documentation, system documentation, and delivery packages with release notifications
• Participation in norm-compliant development according to CENELEC, creation and maintenance of required development artifacts, adherence to configuration and change management
• More than 5 years of experience in backend development with Java
• More than 5 years of experience in backend development with Spring Boot
• CENELEC know-how in software development, evidenced by at least two project references
• More than 3 years of experience with hexagonal architecture or comparable architectural approaches
• More than 3 years of experience with Domain-Driven Design (DDD)
• German at near-native level (C2)
• Experience with observability tools such as Grafana, Prometheus, and Tempo
• Experience with AWS
• Experience with Infrastructure as Code, ideally Pulumi
• Experience with Event Driven Design and Event Sourcing
• Experience with Kubernetes or OpenShift
• Experience with NATS as a messaging broker
• Experience with GitLab CI/CD

Project details

01.01.2027

End: 31.12.2027

Utilization: approx. 1,600 hours (200 person-days) over the project duration, full-time

remote, service provision from Germany or the European Economic Area, individual on-site appointments in Germany possible

Environment: Transport and infrastructure, safety-relevant software according to CENELEC

• Start: 2027-01
• Remote: hybrid
• Location: Frankfurt am Main, Deutschland, DE
• Languages: German