Senior Backend Developer for Safety-Relevant Warning Systems

Project overview

Application/Offer Deadline 20.10.2026, 10:00 AM

Project Framework Conditions

Project details

Berlin; fully remote

01.01.2027–31.12.2027; approx. 11.99 months

Scope: 200 PT of which 200 remote, 0 onsite = 100.00% remote

Utilization: Average approx. 3.84 days/week

Nearshore: Germany and European Economic Area

Language / Required Language Level: German – near native proficiency (C2)

Conditions – Mandatory Information for Candidates:

For further processing of your application, this information is absolutely required: Please state your desired billing method and your hourly or daily rate, separated for remote and onsite. Also indicate whether travel expenses are included or will be charged separately. If charged separately, please state the amount or the basis for calculation.

1.1 Project/Process Context

Greenfield development of an event-driven system for reliable and timely safety announcements on train platforms, deployable throughout Germany. Timetable, train route, and location data automatically trigger warnings. Gradual expansion from train-precise warnings via timetable/interval triggers to comprehensive coverage and connection to announcement systems. Safety-relevant development according to CENELEC (EN 50126 / EN 50716).

1.2 Project Structure

Nationwide distributed, self-organized team with agile principles and mutual support.

3.1. Scope

Independent and self-organized: Implement/customize components, interfaces, modules, and databases with Java, Spring Boot, Event-Sourcing/Axon Framework, and NATS; adhere to specified development environments, standards, and programming guidelines. Cloud-native operation and development with Kubernetes/OpenShift, AWS, and IaC/Pulumi. GitLab-CI/CD for builds, tests, and deployments; Observability with Grafana, Prometheus, and Tempo including metrics, logs, traces. Fix test errors; maintain automated unit, integration, and component tests.

Create component/system documentation and delivery packages with release notifications. Support norm-compliant development according to CENELEC (EN 50126 / EN 50716) with development artifacts, configuration, and change management.

4.1 Must-Have Requirements - 100% Mandatory to Fulfill

4.2 Should-Have Requirements

• Conditions / Billing Method (Hourly or Daily Rate)
• Hourly Rate Remote (EUR/hour) and Hourly Rate Onsite (EUR/hour)
• Or Daily Rate Remote (EUR/day) and Daily Rate Onsite (EUR/day)
• Travel Expenses
• M1: Backend development with Java; Senior (> 5 years experience).
• M2: Backend development with Spring Boot; Senior (> 5 years experience).
• M3: CENELEC know-how in software development; 2 references.
• M4: Hexagonal architecture or similar; Intermediate (> 3 years experience).
• M5: Domain-Driven Design (DDD); Intermediate (> 3 years experience).
• S1: Observability using suitable tools, including Grafana, Prometheus, and Tempo; Intermediate (> 3 years experience); 20%.
• S2: AWS; Intermediate (> 3 years experience); 20%.
• S3: Infrastructure as Code with Pulumi; Senior (> 5 years experience); 15%.
• S4: Event Driven Design; Senior (> 5 years experience); 15%.
• S5: Kubernetes/OpenShift; Intermediate (> 3 years experience); 10%.
• S6: Backend development with NATS as messaging broker; Senior (> 5 years experience); 10%.
• S7: GitLab CI/CD; Senior (> 5 years experience); 10%.
• Start: 2027-01
• Duration: 12 Monate
• Remote: remote
• Location: Frankfurt am Main, Deutschland, DE
• Languages: German