Backend Engineer (CoreAI)
At eBay, we're more than a global ecommerce leader — we’re changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. We’re committed to pushing boundaries and leaving our mark as we reinvent the future of ecommerce for enthusiasts.
Our customers are our compass, authenticity thrives, bold ideas are welcome, and everyone can bring their unique selves to work — every day. We're in this together, sustaining the future of our customers, our company, and our planet.
Join a team of passionate thinkers, innovators, and dreamers — and help us connect people and build communities to create economic opportunity for all.
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.
Please see the Talent Privacy Notice for information regarding how eBay handles your personal data collected when you use the eBay Careers website or apply for a job with eBay.
eBay is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, sex, sexual orientation, gender identity, veteran status, and disability, or other legally protected status. If you have a need that requires accommodation, please contact us at talent@ebay.com. We will make every effort to respond to your request for accommodation as soon as possible. View our accessibility statement to learn more about eBay's commitment to ensuring digital accessibility for people with disabilities.
The eBay Jobs website uses cookies to enhance your experience. By continuing to browse the site, you agree to our use of cookies. Visit our Privacy Center for more information.