Senior Python Backend Developer (m/w/d)

Wir sind Bertrandt. Ein eigenständiger und internationaler
Engineering Dienstleister mit langjähriger Expertise. Mit
branchenübergreifendem Know-how und einem ganzheitlichen System- und
Produktverständnis schaffen wir technologische Lösungen entlang der
gesamten Wertschöpfungskette. Wir beschäftigen uns mit den
Trendthemen Digitalisierung, E-Mobilität und Autonome Systeme
hauptsächlich für die Branchen Automotive, Luftfahrt, Defence und
Maschinenbau und ermöglichen hier konsequent die Entstehung
passgenauer Lösungen. Unser Ziel: den technologischen Fortschritt
beschleunigen und einen relevanten Beitrag zu einer nachhaltigen
Zukunft leisten. Daran arbeiten wir jeden Tag – mit rund 12.000
Mitarbeiterinnen und Mitarbeitern an über 50 Standorten weltweit. We
are looking for an experienced Senior Python Backend Developer to
support the industrialization of AI-powered applications within an
innovative enterprise platform environment. The ideal candidate
combines strong software engineering expertise with experience in
building scalable backend systems, APIs, and cloud-native
applications. A key aspect of this role is transforming rapidly
developed AI prototypes into secure, maintainable, and
production-ready enterprise solutions. The consultant should be
comfortable working independently, identifying technical improvement
opportunities, and collaborating closely with frontend developers, AI
specialists, cloud engineers, and platform teams. Key Facts Strong
understanding of how individual contributions impact end-to-end
business processes Fluent English required Experience with AI-powered
applications Strong Python expertise Up to 100% mobile working
possible after onboarding and individual agreement Your
Responsibilities Design, develop, and maintain scalable Python backend
services Build and integrate REST APIs for modern web applications
Develop data processing pipelines supporting AI-based solutions
Transform proof-of-concept and prototype applications into
production-ready enterprise software Improve software architecture,
maintainability, scalability, and performance Implement
authentication, authorization, logging, monitoring, and error-handling
concepts Ensure high code quality through testing, code reviews, and
engineering best practices Create technical documentation and
architectural guidelines Collaborate closely with Data Scientists,
Frontend Developers, Product Owners, and Cloud Engineers Contribute
technical expertise and proactively drive improvements to existing
solutions Required Technical Skills Programming & Backend Development
Python (5+ years of professional experience) FastAPI (preferred) or
Flask Asynchronous Python development Object-Oriented Programming
(OOP) Clean Architecture / Domain-Driven Design (DDD) API Development
REST API design and implementation OpenAPI / Swagger Authentication
concepts (OAuth2, JWT) Databases PostgreSQL SQLAlchemy Data modelling
and database design Software Engineering Clean Code principles
Software architecture and design patterns Unit testing and integration
testing Performance optimization Production debugging and
troubleshooting AI & Data Experience (Preferred) Experience with
AI-supported applications is highly desirable, including: Backend
services supporting LLM-based applications Vector databases
Retrieval-Augmented Generation (RAG) architectures LangChain or
LlamaIndex Document processing pipelines AI model integration via APIs
Your Background Minimum completed vocational training 5+ years of
professional experience in Python backend development Proven track
record building production-grade backend applications Experience
designing scalable APIs and backend services Experience working within
cloud-native environments Experience modernizing, optimizing, or
industrializing existing software solutions Experience collaborating
within agile and cross-functional teams Personal Competencies Strong
analytical and problem-solving capabilities Independent, structured,
and solution-oriented working style Excellent communication skills
Pragmatic and hands-on mindset High quality standards and attention to
detail Ability to challenge existing technical solutions
constructively Fluent English, both written and spoken Within the
framework of temporary employment, we are looking for an experienced
Senior Python Backend Developer (m/f/d) to support the development of
scalable backend solutions and AI-powered applications. If you are
passionate about Python, cloud-native technologies, and modern
software architecture, we look forward to hearing from you. Required
Technical Skills Programming & Backend Development Python (5+ years of
professional experience) FastAPI (preferred) or Flask Asynchronous
Python development Object-Oriented Programming (OOP) Clean
Architecture / Domain-Driven Design (DDD) API Development REST API
design and implementation OpenAPI / Swagger Authentication concepts
(OAuth2, JWT) Databases PostgreSQL SQLAlchemy Data modelling and
database design Software Engineering Clean Code principles Software
architecture and design patterns Unit testing and integration testing
Performance optimization Production debugging and troubleshooting AI &
Data Experience (Preferred) Experience with AI-supported applications
is highly desirable, including: Backend services supporting LLM-based
applications Vector databases Retrieval-Augmented Generation (RAG)
architectures LangChain or LlamaIndex Document processing pipelines AI
model integration via APIs Your Background Minimum completed
vocational training 5+ years of professional experience in Python
backend development Proven track record building production-grade
backend applications Experience designing scalable APIs and backend
services Experience working within cloud-native environments
Experience modernizing, optimizing, or industrializing existing
software solutions Experience collaborating within agile and
cross-functional teams Personal Competencies Strong analytical and