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Senior ML/AI Engineer

Wizeline

Barcelona - Spain (Spain) permanent

Posted: April 8, 2026

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Quick Summary

We are looking for an experienced Senior ML/AI Engineer to join our global team in Barcelona, Spain. The ideal candidate will have a strong technical background in AI and ML, with experience working with data science and engineering teams.

Job Description

We are:
Wizeline, a global AI-native technology solutions provider, develops cutting-edge, AI-powered digital products and platforms. We partner with clients to leverage data and AI, accelerating market entry and driving business transformation. As a global community of innovators, we foster a culture of growth, collaboration, and impact.

With the right people and the right ideas, there’s no limit to what we can achieve

Are you a fit?
Sounds awesome, right? Now, let’s make sure you’re a good fit for the role:

Key Responsibilities

• Collaborate with data scientists and engineers to orchestrate LLMs and tools into complex AI workflows.

• Implement optimized vector storage and indexing systems for NLP.

• Develop tools and frameworks for prompt management, automated evaluations, and observability.

• Monitor and improve agentic systems performance for accuracy and efficiency.

• Provide ongoing support, troubleshoot issues, and implement updates for ML solutions

• Build and maintain data processing pipelines for high volumes of structured and unstructured data.

• Integrate third-party AI APIs (internal and external) to extend the functionality of systems.

• Stay updated on GenAI, NLP, ML, and IR technologies, incorporating best practices and leveraging cloud infrastructure for efficiency.

• Build and extend internal products on top of the LangChain ecosystem (LangGraph, LangSmith) to support prompt management, evaluation, and agent orchestration across the team.

Must-have Skills:

• Bachelor's or Master's degree in Computer Science, Engineering, Data Science, or a related STEM field or equivalent work experience.

• 4+ years of industrial experience in a machine learning engineering or data engineering role.

• Strong programming skills in Python and/or another high-level language commonly used in machine learning.

• Experience deploying LLMs, implementing automated evaluation pipelines (LLM-as-a-judge), and architecting multi-agent systems that utilize tool-calling and long-term memory to solve non-linear problems.

Nice-to-have:

• AI Tooling Proficiency: Leverage one or more AI tools to optimize and augment day-to-day work, including drafting, analysis, research, or process automation. Provide recommendations on effective AI use and identify opportunities to streamline workflows.

• Familiarity with cloud-based infrastructure and services (e.g., AWS and GCP), Docker, and the Git version control system

• Familiarity with consuming and integrating APIs in a reliable and secure manner.

What we offer:

• A High-Impact Environment

• Commitment to Professional Development

• Flexible and Collaborative Culture

• Global Opportunities

• Vibrant Community

• Total Rewards

*Specific benefits are determined by the employment type and location.

Find out more about our culture here.

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