Senior Machine Learning Engineer (m/f/x)

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<p>You don't want another contract that ends at the notebook. You want the pager, the promotion lane and the authority to say a model isn't ready. This one is based in Brazil, 40 hours a week on your own invoice, and everything after handoff is yours.</p>
<p><strong>Location:</strong> Remote from Brazil — you must be based in Brazil. 40 hours per week, Monday to Friday, with daily overlap into the Berlin working day.</p>
<h3>&nbsp;</h3>
<h3>About us</h3>
<p>CarOnSale is the AI-powered platform for B2B used car trading in Europe. Over 40,000 buyers from more than 20 countries trade on our platform — and 85% of inventory is exclusive to us. We connect software, pricing intelligence, logistics and financing in one layer — as the operating system for an entire industry.</p>
<p><em><strong>One Platform. One Profit Engine.</strong></em></p>
<h3>&nbsp;</h3>
<h3>The platform you build in</h3>
<p>Our machine learning runs on one shared, central platform — not a separate pipeline per model. Five canonical stages: data extraction, validation, transformation, training and evaluation. A Snowflake data warehouse feeds a SageMaker managed feature store, and models reach production through governed CI/CD promotion lanes on Terraform-managed AWS infrastructure. Four models serve production today. Fifteen to twenty by mid-2027. Your job is to build inside that platform and make it stronger, so the next model costs less to ship than the last one.</p>
<h3>&nbsp;</h3>
<h3>Your responsibilities</h3>
<ul>
<li>You own models from handoff through to production: packaging, deployment, monitoring, and the decision on whether a model is ready to serve</li>
<li>You keep production models reliable — drift detection, performance monitoring, alerting and incident response when something moves</li>
<li>You own the serving and inference path: fitted pipeline artifacts, inference entry points, monitoring hooks and feature-store parity</li>
<li>You review model design and evaluation methodology before anything ships, and catch data leakage, backward-window errors and weak evaluation during development, while they are still cheap to fix</li>
<li>You extend the shared platform so it stays useful for every model, without project-specific logic leaking into shared code</li>
<li>You set the engineering standards the platform runs on as it scales across the organisation</li>
</ul>
<h3>&nbsp;</h3>
<h3>What you bring</h3>
<ul>
<li>2+ years in production machine learning engineering, with real ownership of models after handoff — not only training them</li>
<li>Strong Python: typed, tested, production-grade code, and you review the work of others</li>
<li>Enough machine learning depth to challenge a pipeline on problem framing, feature engineering, model selection and evaluation methodology</li>
<li>Hands-on experience with a managed ML platform — SageMaker, Vertex AI, Databricks or Azure ML — plus feature stores, CI/CD for machine learning, AWS and Terraform</li>
<li>An AI-native way of working: you use tools like Claude, ChatGPT or Copilot actively in your daily work</li>
<li>English at C1 level, written and spoken. German is not required — we work in English</li>
<li>You are based in Brazil and invoice through your own company. We work directly with you, not through intermediary or umbrella services</li>
</ul>
<p><strong>Nice to have</strong></p>
<ul>
<li>Snowflake and dbt — you can pick both up here</li>
<li>Experience mentoring colleagues or reviewing their work</li>
<li>Comfort operating where the answer is not defined yet</li>
</ul>
<h3>&nbsp;</h3>
<h3>What to expect from us</h3>
<ul>
<li>A full-time engagement: 40 hours per week, Monday to Friday, invoiced monthly against your own company</li>
<li>You are treated like a full member of the team — standups, bi-weekly sprints, and all company communication</li>
<li>Fully remote from anywhere in Brazil</li>
<li>An English-speaking engineering team with short decision paths</li>
<li>Direct ownership of models serving a live product, not a proof of concept</li>
<li>Structured onboarding with a buddy from the team</li>
</ul>
<p>&nbsp;</p>
<p><strong>Apply now — your CV is enough.</strong></p>

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