Lead AI Engineer

Fourth

Sofia, Bulgaria

We are looking for a senior, hands‑on AI Solutions & Engineering Lead to design, build, and productionize AI solutions used across Fourth’s enterprise operations.

Responsibilities:

Own AI engineering and architectural decisions across enterprise solutions
Design and build production‑grade AI systems and pipelines
Take AI solutions from prototype to reliable production
Define engineering standards, quality bars, and production readiness
Shape feasibility, prioritization, and technical approach for AI initiatives in partnership with the Director, without owning overall AI strategy
Translate business problems into scalable, technically sound AI solutions
Work with Data, Security, Legal, Compliance and others on safe AI delivery

Requirements:

5+ years experience in machine learning, AI engineering or software development, with a demonstrated track record of deploying machine learning models and AI solutions in production environments
Strong Python skills for building production AI services
Hands‑on experience running LLM‑based systems in production
Experience with RAG architectures, embeddings, and vector search
Proven ability to design scalable, maintainable systems and APIs
Solid understanding of production operations (monitoring, logging, error handling)
Cloud deployment experience (Azure preferred)
Strong understanding of data pipelines, SQL, and data quality
Working knowledge of AI governance, access control, and responsible AI practices