Senior AI Engineer, Voice-First Agents

Poland and Middle-Eastern Europe; Cape Town; Remote; ZAR 1,666,000 - 2,776,000; Full time

Job summary

Xebia is seeking a Senior AI Engineer to join a product team building a voice-first AI agent that interacts through natural spoken conversations. The agent reasons, uses tools, and acts in real time, with architecture evolving.

You will own the full voice-agent stack—from real-time communication to backend integrations—shaping technical decisions, collaborating with product, design, and a small engineering team, and delivering production-grade systems.

Qualifications

• proven track record of shipping GenAI and agentic systems to production that are used by real users.
• hands-on experience with LangGraph, including designing and running production workflows.
• strong Python skills, including asynchronous programming and building production services such as FastAPI applications.
• strong software engineering and system architecture skills, with the ability to design systems end to end and make informed technical trade-offs.
• senior or lead-level engineering experience with ownership of significant technical decisions.
• strong product sense and evidence of influencing what gets built, not only how it is implemented.
• strong understanding of production-quality software development, testing, observability, and reliability.
• fluent English with the ability to communicate clearly with both technical and non-technical stakeholders.
• willingness to participate in regular in-person team sessions.
• Practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery.
• Work from the European Union region and a work permit are required.

Responsibilities

• Agent workflows design using LangGraph, including state management, tool and function calling, memory, and error recovery.
• Define how agent makes decisions during live conversations with latency concerns.
• Build and maintain backend integrations enabling the agent to take actions.
• Design reliable agent workflows for real-world production environments.
• Voice pipeline: real-time voice pipelines, streaming STT, TTS, VAD, turn-taking, interruption handling.
• Architectural decisions: build-vs-buy, evaluation in development workflow, observability and tracing.

Skills

Python

LangGraph

GenAI

System architecture

Asynchronous programming

FastAPI

Tools

LangSmith

Langfuse

FastAPI

Job description

Xebia is seeking a Senior AI Engineer to join a product team building a voice-first AI agent that interacts through natural spoken conversations. The agent reasons, uses tools, and acts in real time, with architecture evolving.

You will own the full voice-agent stack—from real-time communication to backend integrations—shaping technical decisions, collaborating with product, design, and a small engineering team, and delivering production-grade systems.