Senior Python Backend Engineer (AI / LLM)
Confirmed on the employer's own hiring board on Nov 6, 2026. First seen by Alion on Nov 5, 2026.
from 3000€/gross
Job description
We are looking for a Senior Python Backend Engineer (M/F) for our client in the banking sector. The role focuses on developing modern backend services and AI-powered applications, combining strong Python engineering skills with hands-on experience in LLM-based solutions and agent orchestration.
Responsibilities
Design, develop and maintain scalable backend services using Python.
Build REST APIs and define API contracts using FastAPI or similar frameworks.
Implement asynchronous processing, data validation and automated testing.
Develop and integrate LLM-powered functionalities, AI agents and external tools.
Work with knowledge sources and contribute to agent orchestration.
Evaluate and improve the quality, reliability and performance of AI-generated outputs.
Write clean, maintainable and well-tested code.
Participate in code reviews and collaborate with cross-functional engineering teams.
Contribute to CI/CD workflows and continuous improvement of development processes.
Requirements
Strong hands-on experience with Python backend development.
Experience with modern Python (3.12+) and asynchronous programming.
Experience building REST APIs using FastAPI or comparable frameworks.
Knowledge of Pydantic or similar data validation frameworks.
Experience writing automated tests, preferably using pytest.
Practical experience with LLM-based applications delivered to production.
Understanding of agent orchestration and integration of LLMs with external tools or knowledge sources.
Experience with Git and collaborative development workflows.
Professional working proficiency in English.
Nice to Have
Experience with LangChain or LangGraph.
Knowledge of prompt engineering and LLM evaluation techniques.
Experience with Docker and Kubernetes.
Familiarity with metrics, tracing and structured logging.
Previous experience in banking, financial services or other regulated environments.
Benefits
Engaging projects across diverse industries, offering continuous professional challenges and growth opportunities
Tailor-made learning & development program, complemented by monthly in-house workshops to boost your skills
Flexible working hours and the possibility of home office
Modern, inspiring office environment with daily perks such as breakfast, fresh fruit, and yoga sessions
MultiSport card to support an active lifestyle and access to a wide range of sports and wellness facilities
Company description
Who we are
Ableneo is a partner for AI and technology-driven transformation. We combine deep software engineering with business consulting to help organisations implement intelligent systems that deliver measurable results and reduce the risk of failed innovation.
What we do
- AI & Data Enabling. We deploy chatbots and LLM solutions, automate documents and workflows, and work with Computer Vision. Our focus is on solving concrete business problems with AI and achieving a high success rate in real use cases.
- Business Optimisation & Efficiency. We streamline processes, reduce delays, automate operational work, and set up more efficient ways of working.
- Product Design & Development. We design and build digital products, customer journeys, and scalable platforms that support long-term growth.
- Software Engineering. We offer flexible delivery models. From specialised roles to full teams, supporting both fast-growing companies and established enterprises.
Why join us
We have years of experience and strong references across startups, scale-ups, and large organisations. We work on assignments where AI makes real impact. For example, in the banking sector we validated an LLM solution with a high success rate in a real proof-of-concept.
At Ableneo you will work on projects that push the boundaries of AI and software engineering. You will solve complex problems, collaborate with decision-makers, and help build systems that have immediate business value.
If you want to shape the next generation of intelligent software, let’s talk.