AI Engineer

MediaRadar, Inc.; Madrid; Hybrid; EUR 60,000 - 110,000; Full time

Job summary

MediaRadar in Madrid is seeking an AI Engineer with a strong software engineering backbone to own end-to-end ML solutions and ship production-grade features using Python, PostgreSQL, pgvector, and LangChain.

You will work with Langfuse, Azure OpenAI, and Docker in a highly independent role, collaborating with our Madrid tech team at a local WeWork for regular in-person alignment.

Qualifications

• Strong degree in Computer Science or Telecommunications.
• Clean code, architecture, and scalability are your default settings.
• Active participation in Hackathons or portfolio of side projects.
• Proven ability to thrive in international roles with minimal supervision.
• Expert Python skills (typing, async, performance).
• Deep SQL & Vector DB knowledge; experience with RAG and LLM agents.

Responsibilities

• Own the design and implementation of scalable ML solutions end-to-end.
• Build and fine-tune systems for data such as ad creatives and deduplication.
• Implement chain-of-thought prompting and multi-agent workflows.
• Optimize vectorization and manage migrations with Alembic.
• Ensure guardrails and observability with Langfuse for high-velocity output.

Skills

Python

SQL

Vector DB

RAG pipelines

LLM agents

Async I/O

Education

Bachelor's degree in Computer Science or Telecommunications

Tools

PostgreSQL

pgvector

SQLAlchemy

LangChain

Langfuse

Azure OpenAI

Docker

Alembic

pg_trgm

HNSW

Job description

Location: Madrid, Spain (Remote — with regular in-person collaboration at a local WeWork alongside our Madrid tech team)

About MediaRadar

MediaRadar, now including the data and capabilities of Vivvix, powers the mission-critical marketing and sales decisions that drive competitive advantage. Our competitive advertising intelligence platform enables clients to achieve peak performance with always-on data and insights that span the media, creative, and business strategies of five million brands across 30+ media channels. By bringing the advertising past, present, and future into focus, our clients rapidly act on the competitive moves and emerging advertising trends impacting their business.

Job Summary

We are building a best-in-class AI team focused on delivering advanced capabilities that empower our data organization. This is not a role for theoretical research; it is for an AI Engineer with a strong Software Engineering backbone. You will be expected to be highly independent, taking ownership of problems from end-to-end. We value "Modern Productivity"—you should leverage LLMs and AI coding assistants to bypass boilerplate and ship code faster. In our view, manual line-by-line coding is outdated; we want engineers who use every tool at their disposal to increase output without sacrificing reasoning or quality.

Stack Highlights:

Core: Expert Python (Non-negotiable), PostgreSQL + pgvector, SQLAlchemy.

AI/LLM: Azure OpenAI, LangChain, Langfuse, Multi-agent orchestration.

Productivity: ChatGPT/Copilot for development, Docker, async I/O.

Key Responsibilities

• Independent System Building: Own the design and implementation of scalable ML solutions, moving rapidly from problem statement to working code
• Classification & Attribution: Build and fine-tune systems for complex data, such as identifying ad creatives or global brand deduplication by cross-referencing government registries
• Advanced Reasoning: Implement "Chain of Thought" prompting and multi-agent workflows (e.g., classification agents vs. reasoning agents) to solve complex attribution tasks
• Data Engineering Rigor: Optimize vectorization, manage migrations via Alembic, and ensure high-throughput ingestion with minimal supervision
• Operational Excellence: Implement guardrails and observability (Langfuse) to ensure that high-velocity output remains explainable and robust

Requirements

Key Qualifications

• Academic Foundation: Strong degree in Computer Science or Telecommunications (Teleco)
• Software Rigor: You think like a developer. Clean code, architecture, and scalability are your default settings
• The "Hacker" Spirit: Active participation in Hackathons or a portfolio of ambitious side projects. We want to see that you build things because you love solving problems
• Extreme Independence: Proven ability to thrive in international roles without constant lead structure or heavy supervision
• Technical Mastery:
• * Expert Python (typing, async, performance)
• Deep SQL & Vector DB knowledge (pg_trgm, HNSW)
• Experience building and deploying RAG pipelines and LLM agents

Skill Focus for 2026

• Vision-based ML: Using reasoning to correctly attribute visual ad creatives
• Context Optimization: Utilizing window context detection to improve system reasoning
• Multi-Agent Scaling: Chaining specialized models to automate complex data workflows

Benefits

At MediaRadar, we are committed to creating an inclusive and accessible workplace where everyone can thrive. We believe that diversity of backgrounds, perspectives, and experiences makes us stronger and more innovative. We are proud to be an Equal Opportunity Employer and make employment decisions without regard to race, color, religion, sex (including pregnancy, sexual orientation, or gender identity), national origin, age, disability, genetic information, or any other legally protected status. In accordance with the EEO-1 reporting requirements, we collect demographic data as part of our efforts to ensure fair and equitable hiring practices across all levels of our organization. We are committed to ensuring our recruitment process is accessible to all applicants. If you need a reasonable accommodation during the application or interview process, please contact us at [e-mail] . We're excited to meet people who share our values and want to build the future with us!