API Developer (ID: 2028)

Responsibilities

What you should bring

What we offer you

• You develop and maintain REST endpoints based on AWS API Gateway.
• You implement integration solutions as 1:1 proxy endpoints, mapping-based endpoints, and aggregating endpoints with AWS Lambda.
• You take over endpoint design and versioning according to specified conventions.
• You implement and test role-based access control based on JWT claims.
• You handle error scenarios and define fallback strategies per endpoint.
• You coordinate API contracts and data models with connected backend domains.
• You create and maintain OpenAPI specifications.
• You design test cases for happy path, auth-fail, and business customer contexts.
• Several years of experience in developing REST APIs and integration platforms.
• Very good knowledge of AWS API Gateway and AWS Lambda.
• Experience with API security patterns and access control, especially with JWT, role-based models, claims, least privilege, and auth-fail handling.
• Experience in creating and maintaining OpenAPI specifications as well as in integrating distributed backend systems, including mapping and aggregation solutions.
• Experience with observability, test automation, and engineering tooling, especially with structured logging, metrics, distributed tracing, Instana, Graylog, Cucumber, Playwright, Gatling, WireMock, Maven, GitLab CI/CD, SonarQube, Fortify, and Artifactory.
• Experience in agile development, especially in teams with parallel dependencies on other systems.
• Experience with Java 21 and Spring Boot, as well as with containerized deployments on Kubernetes in AWS EKS.
• Knowledge of JavaScript or TypeScript in the context of API and integration developments is an advantage.
• Experience with cloud-native architectures, Infrastructure-as-Code, as well as AWS backend services like S3, EFS, and ElastiCache, and with PostgreSQL on AWS RDS.
• Knowledge of business customer context models or comparable organizational and role structures.
• You convince with strong communication skills, teamwork, assertiveness, and an analytical mindset.
• Good German language skills in speaking and writing (min. C1).
• A technically demanding environment with a focus on central API and integration platforms.
• An agile working environment with a lot of creative freedom and scope for initiative.
• Collaboration in an experienced and motivated team with close interfaces to various backend domains.
• Opportunities for personal and professional development.
• Service delivery is 60% remote and 40% onsite (Frankfurt (Main)).

Project details

• Start: flexible
• Remote: hybrid
• Location: Frankfurt (Main), Deutschland, DE
• Languages: German