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Job Title: Backend Engineer (CoreAI) 

Location: Amsterdam, Netherlands (Hybrid) 

Team: CoreAI at eBay

About the team 

CoreAI at eBay builds and operates large-scale AI systems that power experiences for hundreds of millions of users globally. We develop end-to-end AI platforms and services—from data pipelines and model training to real-time inference and evaluation—enabling product teams across eBay to deliver smarter, faster, and safer experiences. You will be at the cutting edge of the AI revolution, working with state-of-the-art technologies and shipping production systems at massive scale. The position is a hybrid role requiring 3 days per week in the office.

What you’ll do

• Design, build, and operate backend services for AI/ML systems, including data ingestion, feature stores, model training pipelines, and low-latency inference services.

• Own production-grade APIs and microservices that integrate AI capabilities into eBay products and marketplaces.

• Implement scalable, cost-efficient, and reliable distributed systems (e.g., streaming, batch processing, autoscaling, service orchestration).

• Collaborate with ML researchers and product engineers to translate models into robust, secure, and maintainable production services.

• Optimize performance for high throughput and low latency; monitor, observe, and continuously improve system reliability (SLOs, alerting, on-call).

• Ensure data and model quality through rigorous evaluation, testing, and CI/CD best practices.

• Contribute to architecture decisions, documentation, and engineering standards across CoreAI.

• Mentor peers, participate in code reviews, and help foster a culture of technical excellence.

What we’re looking for

• Strong backend engineering experience building distributed systems and APIs in production.

• Proficiency in Java, Python, and Kotlin programming languages

• Experience with cloud infrastructure and container orchestration (e.g., AWS/GCP/Azure, Kubernetes).

• Familiarity with data platforms and streaming technologies (e.g., Kafka, Flink/Spark, object stores, SQL/NoSQL).

• Experience deploying and operating ML services (batch and real-time), model serving frameworks, and feature stores is a plus.

• Solid understanding of system design, networking, performance optimization, and observability (metrics, logs, traces).

• Knowledge of ML fundamentals and MLOps practices (versioning, CI/CD for models, A/B testing, evaluation) is a plus; curiosity and willingness to learn are essential.

• Strong problem-solving skills, ownership mindset, and ability to work cross-functionally in a fast-paced environment.

• Bachelor’s/Master’s in Computer Science, Engineering, or equivalent practical experience.

• 4+ years of professional experience

Nice to have

• Experience in Spark and Hadoop.

• Experience with retrieval systems, ranking, recommendations, search, trust & safety, NLP, or generative AI.

• Experience with GPU/accelerator orchestration and model optimization (quantization, distillation, Triton/TensorRT).

• Experience with privacy, security, and compliance in AI systems.

• Prior work at large scale (millions of users, petabyte data, high QPS).

What we offer

• Impact at global scale: Ship AI systems that touch hundreds of millions of users across eBay’s marketplace.

• Cutting-edge environment: Work with state-of-the-art tooling, modern ML/LLM stacks, and opportunities to collaborate with leading researchers.

• Competitive compensation: Attractive salary, performance-based bonus, and RSU equity.

• Benefits that support you: pension/retirement plan, and wellness programs.

• Time to recharge: Generous paid time off, company holidays, and flexible working hours.

• Learning and growth: Access to conferences, certifications, internal tech talks, and mentorship programs.

• Career development: Clear growth paths, regular performance feedback, and opportunities to lead projects.

• Modern developer experience: High-quality dev tools, eBays own cloud, GPUs for experimentation.

• Inclusive culture: Diverse, supportive team with ERGs and a focus on psychological safety.

• Regular team events

• Family-friendly: Parental leave and flexible schedules when you need them.

• Amsterdam office perks:

  • Free gym in the building

  • Free lunch and stocked snacks/coffee

  • Free VanMoof electric bike rental

  • Commuting expenses reimbursed

  • Hybrid home/office environment

  • Beautiful, centrally located office with quiet rooms

How to apply 

Send your resume and a brief note about your most impactful production system or AI service you’ve built.

eBay is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. If you need assistance during the application process, please let us know.

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