Stellenbeschreibung For our client we are looking for a Python Developer (f/m/d). Start: 05.01.2026 Duration: 3 months, wish for a long-term prolongation Capacity: 80-100% Location: 75% Remote, 25% Berlin or Frankfurt (1 week Berlin/Frankfurt / 3 weeks remote in rotation), up to 50% onsite in peak times Language: English is a must, German is a plus Role: Within the Infrastructure Product Line of the program, the ICE (Infrastructure Cloud Engine) platform provides the software components and APIs that enable the provisioning of virtual infrastructure resources. To strengthen this area, we are seeking consultancy to implement our component architecture and drive software development efforts. The consultant will be responsible for ensuring the implementation of the architectural design and to plan, drive and execute engineering efforts within the delivery. This includes coordinating engineering tasks and following robust quality assurance practices. The scope further covers coordination with other portfolio and platform stakeholders (network, compute, storage, hardware). Coordination with the Infrastructure Product Line architecture is essential to ensure the implementation meets strategic objectives and integrates seamlessly within the overall infrastructure stack. Tasks: - Writing production grade source code to implement architecture design specifications - Writing unit tests and providing code documentation - Actively participating in activities such as agile ceremonies Skills (must-have): - 3 Years of Experience in professional Software Development using High-Level programming languages. - Advanced Python (3.9) proficiency. Strong command of asynchronous programming (asyncio, aiohttp, etc.), multiprocessing, and concurrency models. - Extensive experience with Python frameworks for building scalable APIs and services, specifically FastAPI. - Expertise in modular software design, with an emphasis on separation of concerns and maintainable codebases. - Strong grasp of type hinting, dependency injection, and automated testing frameworks (pytest, unittest, or equivalent). - Experience working with multiple database paradigms: Relational (PostgreSQL), NoSQL (Redis, MongoDB, ArangoDB/Neo4J). Experience with database libraries like SQLAlchemy. - Deep understanding of microservice design principles, including service boundaries, state management, inter-service communication (REST, gRPC, or message queues) and API design. - Thorough understanding of application and API security principles and related frameworks and technologies OAuth2 OIDC. Skills (should-have): - Proficient in database integration for microservices — able to design schema and data models per service and manage data consistency and performance. - Hands-on experience with containerizing services.