We are seeking a Senior AI Engineer to join our engineering team and lead the effort in modernizing our e-commerce platform with AI capabilities. You will be responsible for the architecture, development, and integration of advanced AI systems, including Retrieval-Augmented Generation (RAG) pipelines, autonomous agents, and fine-tuned language models, within a mature, enterprise-grade .NET environment. Besides hands-on engineering, you will influence technical direction, mentor fellow engineers, and play a key role in shaping our long-term AI strategy.Requirements:7+ years of professional software engineering experience, including at least 3 years focused on machine learning or AI engineering.Extensive hands-on experience developing LLM-based applications, such as RAG, agent frameworks, and model fine-tuning in production environments.Strong proficiency in C# / .NET with proven experience managing enterprise-scale .NET codebases.Solid knowledge of Python for ML experimentation, training pipelines, and prototyping.Experience working with vector databases (e.g., Qdrant, Weaviate, Milvus, Amazon OpenSearch, Pinecone) in production.Proficiency with orchestration frameworks like Semantic Kernel, LangChain, or AutoGen.Strong understanding of RESTful APIs, microservices architecture, and distributed systems on AWS.Proven ability to make architectural decisions and communicate technical trade-offs to both engineering and non-technical stakeholders.Track record of leading complex technical initiatives from design to production deployment.Strong analytical skills and the ability to translate ambiguous business problems into clear, well-defined AI solutions.Upper Intermediate or higher English level.Responsibilities:Lead the design and implementation of production-grade RAG architectures that connect large language models to proprietary product, customer, and operational data.Architect and build AI agent systems that automate complex e-commerce workflows, including customer support, merchandising, and order management.Drive the strategy and execution of fine-tuning foundation models on domain-specific datasets to enhance relevance, accuracy, and business alignment.Evaluate, select, and integrate third-party AI services and APIs (e.g., OpenAI, Anthropic, Amazon Bedrock) into existing .NET applications and microservices.Define and promote best practices for prompt engineering, evaluation frameworks, model versioning, and responsible AI use across the engineering organization.Collaborate closely with backend, frontend, data engineering, and product teams to deliver end-to-end AI features within the current platform architecture.Own the performance, reliability, cost optimization, and observability of AI systems in production.Mentor mid-level and junior engineers, conduct code reviews, and raise the technical standard of the team.Proactively identify high-impact opportunities where AI can generate measurable business value.What we offer:Annual paid vacation of 18 working days.Extra vacation days for long-lasting cooperation.Annual paid sick leave of 10 days.Maternity/Paternity leave.The opportunity for sabbatical leave.Marriage and Parenthood Package.Compensation for sports activities or health insurance covering (up to 250$ per year) — after the trial period.Career development plan.English and Spanish classes.Paying taxes and managing PE (Private Entrepreneur).Technical equipment.Internal Referral program.Opportunity to take part in company volunteering activities.Sombra is a “Friendly to Veterans” award-holder.Відгукнутись на вакансію