> Markdown version of [/jobs/ext/1431136-machine-learning-engineer](https://www.wearedevelopers.com/jobs/ext/1431136-machine-learning-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Machine Learning Engineer - **Company:** - Tackle meaningful work in a high-growth, ever-evolving environment. - **Location:** Madrid, Spain (Remote available) - **Salary:** €82,988.0 - €99,586.0 - **Contract:** Permanent contract - **Skills:** Software as a Service, Distributed Systems, Machine Learning, Recommender Systems, Data Streaming, TypeScript, Usage Analysis, Grafana, Free and Open-Source Software - **Published:** July 25, 2026 - **Apply:** https://www.adzuna.es/contact-us.html ## About the Role We know it is rare to find everything. Strong candidates should demonstrate credible ability across all three core areas below and be particularly strong in at least two. + Recommendation and personalization science: you have built recommendation, ranking, search, matching, propensity, or next-best-action systems. You are comfortable beginning with simple, explainable approaches when they are the best way to learn. + HTTP/gRPC, streaming, Go/TypeScript previous experience in distributed systems + Applied model ownership. You have personally built, validated, monitored, and iterated on models used in a product or operational environment. You can work effectively in version-controlled codebases and collaborate with engineers on production implementation. You should also be a strong product thinker and technical communicator. You can take an ambitious and ambiguous objective, identify the most important unknowns, and create a sequence of models and experiments that steadily improves the product. Bonus Points For: + Experience with content, education, onboarding, or learning recommendation systems + Experience with SaaS product telemetry and customer-account data + Experience using warehouse-scale behavioral data + Experience with directed graphs, sequence models, or prerequisite-aware recommendations + Experience with contextual bandits or other exploration strategies + Familiarity with Grafana or the broader observability ecosystem + Experience with open source software or transparent development practices + Experience working with privacy, fairness, explainability, or responsible personalization constraints ## Description This is an applied product data science role. You will personally build, deploy, and operate recommendation models, design experiments, establish evaluation methodology, and define the scientific roadmap. You will partner closely with software engineers who own the production recommender codebase and with an existing Data Analyst who supports measurement, instrumentation, and analysis across Developer Advocacy. What You'll Be Doing: The long-term vision is ambitious, but we do not expect it to arrive in one release. We are looking for someone who can understand the whole problem, establish strong foundations, and ship measurable improvements into the existing recommender one iteration at a time. + Evolve the Interactive Learning Plugin's recommendation system + Develop increasingly personalized approaches to candidate selection, ranking, sequencing, and next-best-action recommendations. + You'll own a real-time recommendation service Build and operate applied models + Develop, validate, version, monitor, and iterate on models used by the recommendation system. + You'll own model training & serving Define what recommendation quality means + Develop offline, online, and longitudinal measures of recommendation performance. + You'll own feature pipelines, monitoring of the model and architecture Ship incremental improvements + Use the data and infrastructure available today while identifying the instrumentation and platform capabilities needed tomorrow. + Integrate improvements into the existing recommender rather than waiting for a complete replacement system. Partner across disciplines + Work closely with software engineers & data analysts to productionize models and integrate them safely into the recommender service. + Partner with the Product Analytics team on metric definitions, instrumentation, data quality, dashboards, and experiment analysis. + Collaborate with Developer Advocacy, Docs, Product, Engineering, GTM, and other teams to translate ambiguous needs into testable hypotheses and measurable product decisions. + Explain modeling choices, tradeoffs, uncertainty, and results clearly to both technical and non-technical audiences. ## Related Videos - [5 steps for running a Kubernetes environment at scale](https://www.wearedevelopers.com/videos/88-5-steps-for-running-a-kubernetes-environment-at-scale) - [Do TypeScript without TypeScript](https://www.wearedevelopers.com/videos/327-do-typescript-without-typescript) - [Python-Based Data Streaming Pipelines Within Minutes](https://www.wearedevelopers.com/videos/1233-python-based-data-streaming-pipelines-within-minutes) - [How We Built a Machine Learning-Based Recommendation System (And Survived to Tell the Tale)](https://www.wearedevelopers.com/videos/752-how-we-built-a-machine-learning-based-recommendation-system-and-survived-to-tell-the-tale) - [All your telemetry data from any source in one place](https://www.wearedevelopers.com/videos/57-all-your-telemetry-data-from-any-source-in-one-place) - [Data Science in Retail](https://www.wearedevelopers.com/videos/586-data-science-in-retail) ## Related Articles - [MLops – Deploying, Maintaining And Evolving Machine Learning Models in Production](https://www.wearedevelopers.com/magazine/115-mlops-deploying-maintaining-and-evolving-machine-learning-models-in-production) - [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe) - [How to Become an AI Engineer](https://www.wearedevelopers.com/magazine/331-how-to-become-an-ai-engineer) - [What Are Large Language Models?](https://www.wearedevelopers.com/magazine/304-what-are-large-language-models) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift)