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# Senior Python Core Engineer (Client Sdk) (Madrid)

- **Company:** Clearml
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Apple Mac Systems, Code Review, Databases, Serialization, Software Debugging, Linux, Python (Programming Language), Open Source Technology, Tensorflow, Software Engineering, AI Infrastructure, Pytorch, System Availability, Backend, Keras, Scikit Learn, HuggingFace, VLLM, llama.cpp
- **Published:** October 28, 2026
- **Apply:** https://www.buscojobs.com.es/senior-python-core-engineer-client-sdk-madrid-en-madrid-ID-377913694

## About the Role

You will dive deep into Python internals and build integrations with the latest AI frameworks

(PyTorch, TensorFlow, vLLM, etc.). If you love metaprogramming, understanding how imports

work under the hood, and packaging libraries for thousands of users, this role is for you., 8+ years of professional software development experience.

 - Deep Python Expertise: You understand metaclasses, descriptors, and how Python

handles imports and memory.

 - Packaging Experience: Proven experience building and packaging Python libraries

(setup.py, poetry, building wheels) and publishing to public repositories (PyPI).

 - Runtime Modification: Strong familiarity with monkey patching, AST manipulation, or

writing custom import hooks.

 - AI Ecosystem Knowledge: Familiarity with the internals of frameworks like PyTorch,

TensorFlow, or vLLM, llama.cpp.

 - Collaboration: Experience working in a remote, distributed team and contributing to

code reviews.

 - Excellent communication skills and ability to work independently or as part of a team.

## Description

About the companyAt ClearML, our mission is to make infrastructure management effortless across every phase ofthe AI lifecycle - from building and training AI models to large-scale production. Trusted bymore than 2,000 organizations, AI builders and IT teams use our AI infrastructure platform topower everything from early-stage R&D; to mission-critical public sector and enterprise-grade AIpipelines.We're growing quickly and looking for curious, self-driven individuals who are excited to shapethe future of AI and the infrastructure that powers it. Our customers are tackling some of theworld's most important challenges - revolutionizing healthcare, discovering new medicines,securing integral finance, protecting national security, and preserving our planet's ecosystems.About the RoleAt ClearML, our SDK is the bridge between data scientists and our infrastructure. We areseeking a Senior Python Engineer to work on the client-side clearml open-source library. Thisis not a standard backend role; you won't be tuning databases. Instead, you will be building the"magic" that allows ClearML to automatically track experiments, creating wheels for PyPI, andensuring our code runs smoothly in diverse user environments.You will dive deep into Python internals and build integrations with the latest AI frameworks(PyTorch, TensorFlow, vLLM, etc.). If you love metaprogramming, understanding how importswork under the hood, and packaging libraries for thousands of users, this role is for you.Responsibilities- Core SDK Development: Design and maintain the client-side Python SDK, ensuringhigh performance and backward compatibility across Python versions.- Automatic Instrumentation: Develop logic to automatically capture code execution,parameters, and metrics using advanced Python techniques (monkey patching,decorators, introspection).- ML Framework Integration: Build and maintain deep integrations with leading AIlibraries (PyTorch, TensorFlow, Keras, Hugging Face, vLLM, scikit-learn).- Packaging & Distribution: Manage the build lifecycle, creating and optimizing Pythonwheels and Eggs, and managing releases to PyPI and Conda.- Cross-Platform Reliability: Ensure the SDK functions seamlessly across Linux,macOS, and Windows environments.- Debug User Environments: Troubleshoot complex client-side issues related tomultiprocessing, serialization (pickle/dill), and memory management.RequirementsRequirements- 8+ years of professional software development experience.- Deep Python Expertise: You understand metaclasses, descriptors, and how Pythonhandles imports and memory.- Packaging Experience: Proven experience building and packaging Python libraries(setup.py, poetry, building wheels) and publishing to public repositories (PyPI).- Runtime Modification: Strong familiarity with monkey patching, AST manipulation, orwriting custom import hooks.- AI Ecosystem Knowledge: Familiarity with the internals of frameworks like PyTorch,TensorFlow, or vLLM, llama.cpp.- Collaboration: Experience working in a remote, distributed team and contributing tocode reviews.- Excellent communication skills and ability to work independently or as part of a team.? Senior Python Core Engineer (Client SDK) (Madrid)? ClearML? Madrid