Senior AI Engineer (Automation)
Hybrid · Sofia, Sofia-Capital, Bulgaria
Job Summary
Senior AI Engineer focused on designing and implementing GraphRAG pipelines that combine knowledge graphs with LLM-based retrieval systems, building scalable data ingestion, transformation, and enrichment pipelines for structured and unstructured data, and integrating LLMs and embedding models into production AI and data services. You will work with workflow automation tools (e.g., n8n) to orchestrate complex data and AI pipelines, build production-grade APIs, and ensure reliability, observability, and scalability of AI-driven backend systems. Collaboration with product, data, backend teams, and Research on AI features and agendas; debugging complex issues across distributed data and AI pipelines. Desired skills include experience with RAG systems, vector databases, embeddings, semantic search, Elasticsearch/OpenSearch, RDF/SPARQL/GraphDB, LangChain/LlamaIndex, multi-agent or agentic workflows, distributed systems, cloud platforms (AWS/GCP/Azure), and open-source contributions.
Required Qualifications
- 4+ years of experience in backend or data engineering (Java, Python, or similar strongly typed language)
- Experience designing and building LLM pipelines, ETL workflows, backend data processing systems, and prompt engineering
- Strong understanding of APIs and backend system design
- A deep understanding of the LLM ecosystem, including model architectures and fine-tuning approaches
- Hands-on experience with structured and/or unstructured data processing
- Experience integrating external services or APIs in production systems
- Degree in Computer Science, Engineering, or equivalent practical experience
- Proficiency in English, both written and verbal
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