Senior AI Engineer — LLMs, RAG & Backend Systems

Itexus LLC; Polonia; A distancia; PLN 120.000 - 180.000; Jornada completa

Descripción de la vacante

Itexus LLC is seeking an experienced Senior AI Engineer to shape a next-generation AI platform for the aviation industry. The role blends AI engineering and backend development, with emphasis on LLM-powered services, multi-agent systems, RAG architectures, and enterprise integrations.

You will design production-ready AI features, collaborate with an international team, and own technical decisions across architecture and delivery. Location is Poland preferred, open to Europe.

Formación

• 5+ years of commercial software engineering experience.
• Backend apps with FastAPI or similar frameworks.
• Production LLM experience.
• Hands-on LangChain or similar agent frameworks.
• Experience designing and implementing RAG solutions.
• Ability to justify architectural choices.
• Embedding, vector search, and vector databases know-how.
• PostgreSQL, SQLAlchemy, Alembic experience.
• REST API integration and third-party services.
• Strong problem-solving and independent ownership.
• English level B2+ or higher.

Responsabilidades

• Develop backend services and APIs using Python and FastAPI.
• Design and maintain production-grade AI services with LLMs.
• Build multi-agent systems using LangChain or similar tools.
• Design and optimize RAG pipelines.
• Create tools for AI agents (Harness Engineering).
• Work with embeddings, vector search, and vector databases.
• Integrate AI capabilities into enterprise apps.
• Improve prompts and LLM interactions for efficiency.
• Integrate and maintain internal/external APIs.
• Test, validate, and improve AI-powered features.
• Participate in architecture decisions and tech choices.
• Understand business workflows and propose practical AI solutions.

Conocimientos

Backend development

LLMs

LangChain

RAG pipelines

API design

Vector search

Embeddings

PostgreSQL

SQLAlchemy

Alembic

REST APIs

Docker

CI/CD

Cloud (Azure/AWS/GCP)

Prompt engineering

LLM optimization

Architecture decisions

Herramientas

FastAPI

PostgreSQL

SQLAlchemy

Alembic

LangChain

PGVector

Qdrant

Pinecone

Weaviate

Milvus

Docker

CI/CD

Azure

AWS

GCP

Descripción del empleo

Itexus LLC is seeking an experienced Senior AI Engineer to shape a next-generation AI platform for the aviation industry. The role blends AI engineering and backend development, with emphasis on LLM-powered services, multi-agent systems, RAG architectures, and enterprise integrations.

You will design production-ready AI features, collaborate with an international team, and own technical decisions across architecture and delivery. Location is Poland preferred, open to Europe.