Staff Machine Learning Engineer for AI Product

Qonto; Barcelona; Presencial; EUR 90.000 - 150.000; Jornada completa

Descripción de la vacante

Qonto in Barcelona is hiring a Staff Machine Learning Engineer for our AI Products team. You will build customer-facing ML features powering fintech solutions for 600,000+ business customers, from requirements to production, with a focus on reliability and privacy.

You will collaborate with Product, Data, and Backend teams, implement ML Ops pipelines, model monitoring, and ensure scalable, safe deployments while mentoring peers.

Formación

• 6+ years as an ML Engineer with ML Ops experience.
• Experience shipping client-facing ML products end-to-end.
• Strong Python engineering, production-grade with FastAPI and DBs.
• Fluent in English; working language at Qonto.
• Experience deploying models in production at scale.

Responsabilidades

• Develop ML models end-to-end from requirements to training, evaluation, and deployment.
• Integrate ML into the product ecosystem with Product, Data, and Backend teams.
• Build ML Ops frameworks: drift detection, monitoring, retraining pipelines.
• Put models into production with rigorous QA and continuous monitoring.
• Mentor peers and share best practices across the ML team.

Conocimientos

ML Engineering

ML Ops

Python

English Fluency

Herramientas

FastAPI

PostgreSQL

Kafka

Snowflake

Airflow

AWS

Kubernetes

Descripción del empleo

Our mission and customers:

We are creating the freedom for SMEs to succeed by delivering Europe's leading finance workspace with banking at its core, augmented by financial tools. We are proud to be rated 4.8 on Trustpilot, based on 55,000+ reviews. Our culture puts customer satisfaction at the core of what we do, as proven by our Net Promoter Score of 75 (more about our culture here).

Our journey:

Founded in 2017 by Alexandre and Steve, Qonto has grown to 1,600+ Qontoers serving over 600,000+ customers across 8 European countries. We have been profitable since 2023, and we are just getting started.

Our beliefs:

We hire for skills and potential. With 80+ nationalities, 45% women, of which 56% of women in our leadership team, diversity isn't a program; It's who we are. We’ve built a discrimination-free hiring process because the best teams are built on merit.

AI at Qonto:

AI is deeply embedded in how we work (here) - Every Qontoer gets unlimited access to the best AI tools. We want people who experiment without waiting for permission, push AI beyond the obvious, know when to trust it, and when to question it.

Join us as a Staff Machine Learning Engineer on our AI Product team to build and ship customer-facing AI for 600,000+ business customers. You'll combine Generative AI with proven machine-learning techniques to create products with measurable impact — adoption, faster task completion, user satisfaction — while ensuring reliability, privacy, and continuous monitoring in production.

What You’ll Do

• Develop ML models end-to-end: From understanding product requirements to training, evaluating, and deploying models in production. You design, iterate, and ship — not just prototype.
• Integrate ML into the product ecosystem: Align with Product Managers, Data Engineers, and Backend Engineers to ensure your models are seamlessly embedded in Qonto's financial services.
• Build the ML Ops framework: Create the infrastructure for the team to scale — model drift detection, performance tracking, automated retraining pipelines, monitoring, and alerts.
• Put models into production with rigour: Robust technical implementation, quality assurance, and continuous monitoring. Client-facing AI in financial services has no room for silent failures.
• Raise the bar for the team: Share best practices, contribute to internal tooling improvements, and mentor peers across the ML team.

What We’re Looking For

• 6+ years as an ML Engineer with ML Ops experience: You've developed and deployed client-facing ML products end-to-end — not internal tools or dashboards. You can show measurable impact on real users.
• Modelling expertise: Experience building and optimising machine learning models for external customers. You know when to use GenAI and when proven ML techniques are the better choice.
• Strong Python engineering: You write resilient, testable code at scale. Proficient with FastAPI (or similar), third-party service integration, and database interaction in production.
• ML Ops fluency: Familiar with tools that automate model retraining, performance checking, and drift detection. You've built or significantly improved ML infrastructure before.
• Fluent in English: Qonto's working language.

What We Can Offer You

• Customer-facing AI with real impact: Your models will be used directly by hundreds of thousands of business customers. You'll see adoption metrics, not just offline evaluations.
• A modern, flexible stack: Python, Snowflake, Kafka, Kibana, PostgreSQL, Airflow, AWS, Prometheus, ArgoCD, GitHub, Cursor. You have the freedom to test any tool as long as it helps reach the target.
• A team building AI at the core of fintech: 10 AI Engineers and 3 Data Ops working on innovative solutions at the heart of Qonto's financial services — not a side project.
• Clear IC growth track: Individual contributor career path for those who want to become deep experts in their field, with access to the latest AI technologies.

Your future manager

Option A

• Her background? A graduate of École Polytechnique, Marianne went on to lead Data Science teams at Uber and Amazon in San Francisco before joining Qonto four years ago to build our Data Science team from scratch — hiring the founding members and defining the technical direction.
• What does she bring to the team? A rare combination of applied ML expertise and business context from Finance — she helps people see both the technical and the strategic side of what they're building.

Option B

• His background? After earning his PhD in Physics and leading ML Engineering and Data Science teams across last-mile logistics and digital marketing, Benjamin joined Qonto to lead our AI Products team.
• What does he bring to the team? Deep technical ML expertise, practical experience building scalable ML systems, and a management style built around ownership and autonomy — he creates the conditions for people to grow without hand-holding.

At Qonto, we understand that true diversity isn’t just about ticking boxes on a hiring checklist. Apply regardless of the boxes you tick — who knows? You may have the missing piece of the puzzle we’ve been searching for all along.

By applying, you agree that Qonto processes your personal data to assess your application. Your data is kept for up to 2 years in our candidate pool. Read our Privacy Notice for full details.

On average, our hiring process lasts 20 working days. More information on our candidate journey here.

Your security matters to us

Recruitment scams are on the rise. Keep in mind, we will never work with third-party platforms or agencies that request payment from candidates. If you receive a suspicious message claiming to be from Qonto, please report it right away ([e-mail])