Senior/Staff Machine Learning Engineer

Vestiaire Collective group; Paris; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Health coverage

Lunch vouchers

Gym-Pass

Learning budget

Job summary

Vestiaire Collective is seeking a Foundational Machine Learning Engineer to build MLOps infrastructure from the ground up. You will focus on AI authentication with computer vision models and scale foundational ML architecture across the marketplace.

This role bridges Applied Science, Data Platform, and Backend Engineering, driving robust, maintainable systems with a focus on low-latency deployment. You will design scalable pipelines for data/feature management, model tracking, and model serving,

Qualifications

• 5-8+ years of hands-on experience in Machine Learning Engineering, focused on MLOps and productionizing ML systems.
• Proven expertise deploying low-latency, high-throughput ML inference services.
• Experience building automated, continuous model retraining pipelines.

Responsibilities

• Lead end-to-end foundational ML lifecycle design: data/feature management, model tracking & registry, serving & monitoring.

Skills

ML Engineering

MLOps

Low-latency inference

Model deployment

AWS / SageMaker

Snowflake

Open Source

CI/CD

Containerization

Feature Stores

Tools

FastAPI

TorchServe

Triton Inference Server

Ray Serve

Airflow

Kubeflow

Metaflow

MLflow

Weights & Biases

Redis

DynamoDB

Snowflake

Job description

Vestiaire Collective is the leading global platform for desirable pre-loved fashion and a pioneer in transforming how people consume fashion.

Our mission is simple: make circular fashion the norm, not the exception.
Through technology, expertise, and a highly engaged global community, we enable millions of people to buy and sell fashion in a more sustainable way.

Founded in Paris in 2009, Vestiaire Collective is now a globally scaled marketplace with offices in Paris, London, Berlin, New York, Singapore, and Ho Chi Minh City, and logistics hubs across Europe, Asia, and the US.

Today, we are a team of around600 people from over 50 nationalities, united by a shared ambition: to drive meaningful change in the fashion industry.

Our values, Activism, Transparency, Dedication, Greatness, and Collective,shape how we build, collaborate, and grow every day.

About the Role

We are seeking a Foundational Machine Learning Engineer for a high-impact greenfield opportunity to build our MLOps infrastructure from the ground up at Vestiaire Collective. While driving our AI authentication initiatives (deploying multi-model approaches including computer vision for luxury product authentication and counterfeit detection) will be your immediate focus, your long-term mission will be to scale foundational architecture across the entire marketplace. You will expand our ML capabilities to power broader domains, primarily focusing on search and recommendation systems, with future expansions into dynamic pricing and marketing technologies. Acting as the bridge among Applied Science, Data Platform, and Backend Engineering, you will design robust, decoupled architectures and spearhead the MLOps strategy with our Director of Data, prioritizing system maintainability, engineering hygiene, and the reliable deployment of complex models, ensuring all our ML models across the board deliver high-throughput, low-latency business impact.

What You Will Do

• Short-Term Impact (First 6 Months): Partner closely with the Operations squads and Data Scientists to accelerate ML and RAG prototypes into resilient, production-ready code. You will directly integrate with the team to deploy, optimize, and scale heavy-width CV and VLM models focused on fraud detection and luxury product authentication, immediately improving our trust and safety ecosystem.

• Mid-Term Foundation (MLOps Lifecycle & Infrastructure): Lead the end-to-end foundational groundwork of our ML lifecycle by designing robust systems for Data & Feature Management, Model Tracking & Registry, and Model Serving & Monitoring. You will scale infrastructure by automating continuous retraining pipelines that handle diverse deployment cadences (from daily fraud detection to weekly recommendations), design resilient multi-model architectures, and critically evaluate the technical overhead and TCO of our in-house tools against enterprise-grade platforms to ensure long-term resilience.

• Long-Term Vision (Centralizing 360-Degree MLE Capabilities): Act as a pioneer and cornerstone hire for the ML engineering discipline at Vestiaire Collective, setting the technical standards to help scale the AI/ML organization. You will transition into a centralized foundational role, moving beyond single-squad operations to mentor the team and provide horizontal ML infrastructure support to multiple domains, including Search, Discovery, Pricing, Marketing, and Data Platforms.

Who You Are

Must-Haves:

• Experience: 5-8+ years of hands-on experience in Machine Learning Engineering, specifically focused on building and scaling MLOps infrastructure and productionizing ML systems.

• Production Infrastructure: Proven expertise in deploying low-latency, high-throughput ML inference services (using FastAPI, TorchServe, Triton Inference Server, or Ray Serve) across both classical lightweight and heavy-width ML models (PyTorch/TensorFlow). Strong preference for AWS (EKS, EC2, SageMaker) / Snowflake and Open Source ecosystems over GCP/Azure.

• MLOps & Pipelines: Deep experience building automated, continuous model retraining pipelines to handle concept drift (ranging from daily to weekly cycles). You have orchestrated decoupled, multi-model AI architectures using tools like Airflow, Kubeflow, or Metaflow, and possess strong expertise in model registry and tracking tools like MLflow or Weights & Biases.

• Feature Stores: Hands-on experience evaluating, building, or extensively leveraging online (Redis, DynamoDB) and offline (Snowflake, S3) Feature Stores in a production environment. Familiarity with frameworks like Feast or custom dbt-based pipelines is highly valued.

• Strategic Builder Mindset: You are an analytical builder who thinks long-term. You can successfully evaluate TCO for bespoke internal systems versus enterprise tools, anticipate technical liabilities, and design robust architectures that handle unpredictable peak traffic surges.

• Collaboration & Engineering Hygiene: Strong cross-functional communication skills. You excel at translating complex ML prototypes into highly scalable production code backed by strict version control, rigorous testing, and CI/CD best practices, seamlessly connecting data science innovation with backend engineering execution.

Nice-to-Haves:

• Relevant Domain Expertise: Background in E-commerce, Single-SKU Marketplaces, Search & Recommendation, Trust & Safety, or Counterfeit Detection.

• Vision, Edge & Optimization: Hands-on experience with Vector Databases, Visual RAG pipelines, deploying Deep Learning VLM models, and optimizing models for edge computing or low-latency inference (e.g., ONNX, TensorRT).

Infrastructure & Observability: Advanced experience with containerization (Docker, Kubernetes), Infrastructure as Code (Terraform), and data transformation workflows (dbt). Familiarity with setting up advanced monitoring for model performance, concept drift, and system health (Datadog, Prometheus).

What We Offer

• Purpose-driven work at scale
  Join a company reshaping the fashion industry towards circularity, you directly contributes to reducing waste and extending the life of luxury items.
• High-impact scope & ownership
  Work on products used globally, where your decisions have immediate, measurable impact on millions of users across 70+ countries.
• A truly international environment
  Collaborate with a diverse team of 50+ nationalities across Paris, London, Berlin, New York, Singapore, and Ho Chi Minh City.
• Career acceleration in a fast-moving scale-up
  Take ownership early, grow fast, and shape your path, as an expert or a future leader.
• Learning & growth as a priority
  Dedicated budget, continuous feedback culture, and opportunities to work on cutting-edge topics (AI, marketplace dynamics, scalability, etc.).
• Flexible ways of working
  Hybrid model (typically 2 days remote per week), with trust and autonomy at the core of how we operate.
• Give back through action
  2 paid days per year to support a cause of your choice and actively contribute to positive impact beyond your day-to-day role.
• Competitive compensation & benefits
  Including bonus, health coverage, lunch vouchers, Gym-Pass, and additional legal perks depending on your location.

Research shows that candidates from underrepresented backgrounds including women, people with disabilities, and other marginalized communities, are less likely to apply unless they meet 100% of the criteria.

At Vestiaire Collective, we believe diversity drives better decisions, stronger products, and more meaningful impact.

_ Vestiaire Collective is proud to be an equal opportunity employer. _

PS: We take candidate experience seriously, and your safety too !

Vestiaire Collective will only contact you through official email addresses ending in @vestiairecollective.com or [e-mail].
We will never:

• Contact you via WhatsApp, Telegram, or similar platforms
• Ask for payment or banking information at any stage of the process

If you receive a suspicious message, please report it to: [e-mail]