Senior NodeJS Backend Engineer

At eBay were more than a global ecommerce leader were changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. Were 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. Were 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.

Team Overview:

Join the Marketing Technologies Platform Team that powers billions of customer interactions per day. This team builds and scales intelligent communication systems integrating cutting-edge AI to deliver personalized and timely engagement experiences across eBays global user base.

Role Overview:

We are looking for an experienced and highly motivated Senior Engineer with a strong background in developing scalable web services and AI-powered applications. You will play a central role in designing developing and maintaining APIs and backend systems that integrate with large language models (LLMs) agent frameworks and advanced AI technologies. This role is ideal for engineers who are passionate about building the future of AI applications.

Key Responsibilities

• Backend Development: Design develop and maintain high-performance scalable services for real-time AI-driven applications.

• AI Integration: Implement systems that interact with AI models and services such as OpenAI (GPT) Anthropic (Claude) and others.

• Agent Frameworks: Apply agent design patterns and leverage frameworks like LangGraph and LangChain to orchestrate multi-step workflows and reasoning tasks.

• Prompt Engineering & RAG: Develop robust prompt interfaces retrieval-augmented generation pipelines and context-aware query structures.

• Model Context Protocol (MCP): Design and implement context-aware AI services leveraging the Model Context Protocol for effective orchestration and input management.

• System Design: Architect distributed systems that are secure fault-tolerant and horizontally scalable.

• Collaboration: Work with data scientists product managers and fellow engineers to translate requirements into technical deliverables.

• Testing & CI/CD: Implement unit tests integration tests and maintain CI/CD pipelines for deployment and automation.

• Documentation: Contribute to technical documentation system diagrams and design specifications.

• Code Review & Mentorship: Participate in peer reviews and provide guidance to junior developers.

Qualifications Required:

• Education: Bachelors or Masters degree in Computer Science Engineering or a related technical discipline.

• Experience: 6 years of experience in backend development with a focus on and JavaScript/TypeScript.

• APIs & Protocols: Expertise in building and consuming RESTful and GraphQL APIs.

• Databases: Strong proficiency in relational and NoSQL databases (e.g. PostgreSQL MongoDB).

• Cloud: Experience with cloud-native development on AWS GCP or Azure.

• AI Technologies: Hands-on experience integrating with LLMs (e.g. GPT Claude) embedding models vector databases (e.g. Pinecone Weaviate FAISS) and prompt engineering techniques.

• Agent Systems: Solid understanding of agent frameworks tools and design patterns for autonomous AI behavior.

• Security: Knowledge of API authentication authorization (OAuth JWT) and security best practices.

Preferred:

• Experience with LangChain LangGraph Semantic Kernel or similar orchestration frameworks.

• Familiarity with front-end frameworks (React Vue) is a plus.

• Knowledge of event-driven architectures and message queues (e.g. Kafka RabbitMQ).

• Experience with containerization and orchestration (Docker Kubernetes).

• Familiarity with MLOps workflows and model lifecycle management.

• Exposure to observability tools (e.g. Datadog Prometheus OpenTelemetry).

If youre excited about the intersection of high-scale engineering and cutting-edge AI and youre driven to build the next generation of intelligent applications we encourage you to apply.

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