Senior Python FastAPI Software Engineer

Source Technology Limited; Berlin; Vor Ort; EUR 110.700 - 138.375; Vollzeit

Zusammenfassung

Source Technology Limited in Berlin is seeking a Senior Python Software Engineer to join a hybrid team on a three-month contract with potential extension. You will design, implement and deliver scalable Python services using FastAPI, and contribute to API design and security.

The role emphasizes maintainable code, robust testing, and collaboration across agile ceremonies. Applicants should have extensive Python expertise, strong English, and a track record in building production-grade software

Qualifikationen

• 8+ years of professional software development experience.
• Advanced Python with asyncio, multiprocessing and concurrency.
• Extensive experience building scalable APIs with FastAPI.
• Modular architecture with maintainable code.
• Strong typing, DI, and automated testing.
• Relational and NoSQL databases with SQLAlchemy.
• Microservice design with REST and gRPC.
• Security best practices incl. OAuth2/OIDC.
• Fluent English required.

Aufgaben

• Write production-grade code implementing architecture design specs.
• Write unit tests and provide code documentation.
• Actively participate in agile ceremonies.
• Lead technical decisions within architecture boundaries.
• Communicate decisions to peers and stakeholders.

Kenntnisse

8+ years software development

Advanced Python (3.9+)

Asyncio & concurrency

FastAPI framework

Modular software design

Type hints & DI

Automated testing (pytest/unittest)

REST/gRPC API design

OAuth2/OIDC security

Fluent English (C1)

Tools

SQLAlchemy

PostgreSQL

Redis

MongoDB

ArangoDB

Neo4j

Docker

Kubernetes

Jobbeschreibung

Senior Python Software Engineer

Berlin (hybrid)

3 month initial contract w/ scope to extend

€600-750 per day

Profile Requirements

Must-have experience

• 8+ Year 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,) and API design.
• Thorough understanding of application and API security principles and related frameworks and technologies OAuth2 OIDC.

Must-have language skills

• Fluent English in speech and writing (at least C1).

Preferred experience

• 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

Responsibilities

Objective: Programming

• 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.

Objective: Technical Leadership

• Making technical decisions within the boundaries set by architecture design.
• Communication of decisions to peers, architecture and relevant stakeholders.
• Generate and communicate status reports to stakeholders, e.g. architects and delivery.
• Facilitation of meetings and presentation of technical concepts in simple terms to medium sized audiences.

Objective: General Leadership

• Providing guidance to other development stakeholders
• Ensuring on-time delivery of application features and/or entire software components.

Objective: Continuous improvement

• Identifying opportunities for improvements towards the development process.
• Promoting and fostering agile ways of working.