Senior AI Engineer

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Reeinvent is a software company that bridges the past with the future. By combining existing knowledge with new disruptive technologies such as AI and new business models, we help our clients transform their digital business.

We have a deep knowledge in digital transformation opportunities in different business sectors. Together we create high-performance teams that match your needs. Your digital platform will be built on fact-based insights, automation and agility.

Opis posla

We are looking for a Senior AI Engineer in Sarajevo with deep experience in software development and hands-on expertise in building AI agents in Python.

You will work closely with an AI Solution Architect and product teams on a large Swedish client engagement.

This role is focused on designing, building, and operating complex agent-based and RAG-driven AI systems in backend environments, with a high degree of ownership and technical leadership.

General Profile

• Senior, self-driven engineer comfortable owning complex AI systems end to end
• Strong architectural thinking combined with hands-on implementation skills
• Comfortable making technical decisions and guiding others through complex problems
• Fluent professional English for written and verbal communication
• Strong focus on robustness, scalability, and long-term sustainability

Responsibilities

• Design, build, and maintain advanced AI agents in Python that reason, plan, use tools, and complete complex multi-step tasks
• Develop agent orchestration logic and interaction patterns based on the ReAct (Reasoning + Acting) paradigm
• Engineer prompts and context inputs that steer LLM behavior across chat, copilot, summarization, and automation use cases
• Design and evolve sophisticated RAG pipelines, including document ingestion, chunking, indexing, retrieval, and response generation
• Implement and manage vector database integrations and semantic search workflows
• Integrate LLMs with internal systems, customer-facing products, and third-party services via APIs
• Evaluate, tune, and optimize AI behavior with respect to accuracy, latency, cost, hallucinations, and consistency
• Collaborate closely with the AI Solution Architect on solution design and technical direction
• Act as a technical reference within the team for AI agent development

Kvalifikacije

• Approximately 10+ years of professional software development experience
• At least 2–3 years of hands-on experience developing AI- or LLM-based systems
• Strong hands-on experience developing AI agents and LLM-based systems in Python
• Experience building production applications using LLM APIs and foundation models
• Strong experience with LlamaIndex or similar frameworks for agent-based and RAG solutions
• Good understanding of RAG architectures, embeddings, and retrieval strategies
• Experience working with vector databases (e.g. Pinecone, Weaviate, FAISS, Qdrant, or similar)
• Experience implementing agent reasoning, planning, tool invocation, and control flows (e.g. ReAct-style agents)
• Experience with prompt engineering, context engineering, and behavior tuning of LLMs
• Strong understanding of AI failure modes, performance trade-offs, and responsible usage patterns

Dodatne informacijeAdditional Plus

• Familiarity or experience with Azure cloud infrastructure, including servers, databases, containers, and related platform services
• Experience with React for building or integrating user interfaces that interact with AI-driven functionality

Development Process & Governance

• Operate within clients’ Agile/SCRUM frameworks
• Participate in agreed SCRUM events such as sprint planning, stand-ups, reviews, and retrospectives

Why Reeinvent?

• Opportunity to work with a large, long-term Swedish client on production-grade AI solution
• Hands-on involvement in building and evolving our own product within the same AI domain
• High degree of ownership and influence over architecture and technical direction
• Collaborative, low-ego culture with strong senior expertise
• Focus on quality, sustainability, and long-term partnerships
• Flexible working setup and trust-based environment