Sr. AI Engineer (Python) - 100% REMOTE from BRAZIL/ CAD payment / Advanced English (must)

Sr. AI Engineer (Python) - 100% REMOTE from BRAZIL/ CAD payment / Advanced English (must) Apply now Position: AI Engineer Location: Brazil (Remote) About the Client A leading U.S.-based digital technology company focused on empowering global creators, media teams, and brands through advanced content solutions. The company builds large-scale platforms and AI-powered tools that support growth, automation, and digital strategy across multiple products. We are looking for an AI Engineer with strong experience in machine learning, data engineering, and backend development to design and deploy next-generation AI agentic solutions. About the Role The AI Engineer will play a key role in designing, developing, and implementing AI-driven features and automation systems. The position requires deep experience with LLMs, prompt engineering, retrieval-augmented generation (RAG), and backend/API development — with a focus on scalability, reliability, and innovation. Key Responsibilities Design, develop, and deploy AI-powered systems leveraging large language models (LLMs), prompt engineering techniques, and RAG-based workflows. Build scalable AI pipelines and backend components in Python , integrating with internal and external APIs. Architect and implement multi-agent systems coordinating LLM interactions for complex tasks. Collaborate with backend, data, and product teams to embed intelligent features and enable automated workflows across the company’s platforms. Optimize LLM prompt performance, track quality metrics, and refine strategies using tools such as LangChain , LangGraph , and similar frameworks. Fine-tune open-source or proprietary LLMs to improve context relevance and task accuracy. Design and maintain efficient data retrieval systems for RAG pipelines, including indexing and knowledge base integration. Ensure strong observability, monitoring, testing, and evaluation processes for AI agents in production environments. Write clean, maintainable, modular code and contribute to code quality through reviews and best practices. Maintain up-to-date technical documentation for AI agents, services, and workflows. Key Requirements Bachelor’s degree in Computer Science, Information Systems, Engineering, or related fields. 3+ years of experience in AI development (experience in digital/content platforms is a plus but not required). Strong proficiency in Python and backend/web development. Hands-on experience with LangChain , LangGraph , or similar agentic/LLM frameworks (LangSmith is a plus). Experience building multi-agent systems . Experience with RAG pipelines and fine-tuning of LLM models. Experience monitoring, evaluating, and optimizing LLM prompt performance. 2+ years of experience as a backend developer . Solid understanding of horizontal scalability and distributed system design. Ability to write clean, efficient, well-structured code. Familiarity with cloud infrastructure and containerization (Docker, Kubernetes). Experience with Git, CI/CD workflows, and code review processes. Strong understanding of SQL/NoSQL databases and writing optimized queries. Understanding of A/B testing, analytics, and performance metrics. Strong problem-solving skills, attention to detail, and ability to thrive in a fast-paced environment. Excellent communication skills and teamwork abilities. Preferred Qualifications Experience with ML libraries (e.g., TensorFlow, PyTorch). Experience with FastAPI . Experience writing automated tests in Python. Locations BRAZIL, ARGENTINA Remote status Fully Remote