Senior AI Engineer – Large Language Model Systems

About the Position

Unleash the Future of AI - Build Scalable, Ground-breaking Large Language Model Systems!

Porto-based opportunity with a fully remote work model.

As a Senior AI Engineer, you will be working for our client, a global leader in AI innovation dedicated to transforming industries through advanced language models and intelligent automation. You will own the architecture and end-to-end delivery of complex, production-grade AI systems-ranging from AI decisioning logic to multi-step conversational agents-pushing the boundaries of what’s possible with large language models. Join us to shape the future of AI technology and accelerate your career in cutting-edge innovation.

Responsibilities

• Design and implement scalable, reliable AI systems with a focus on latency, cost, and operational efficiency.
• Develop complex language model architectures, including RAG, tool-calling, and multi-agent orchestration.
• Build evaluation frameworks to measure model quality, detect regressions, and monitor drift in production environments.
• Integrate AI/ML models into core business logic, ensuring safety, compliance, and robustness in decision-critical contexts.
• Engineer solutions for hallucination mitigation and safe-failure in regulated applications.
• Collaborate with cross-functional teams to review designs, mentor engineers, and promote best practices in AI engineering.
• Evaluate build-vs-buy options across LLM providers and third-party AI tools to optimize performance and cost.
• Ensure observability, guardrails, and caching are in place for AI decisioning pipelines.

Requirements

• 5+ years of software engineering experience, including 2+ years working with production Large Language Models (LLMs).
• Deep expertise in LLM application architecture: retrieval-augmented generation (RAG), multi-agent orchestration, model routing, and fallback strategies.
• Proven track record of deploying scalable AI systems with a focus on latency, reliability, and cost management.
• Strong system design skills with experience in guardrails, caching, and observability for AI pipelines.
• Practical knowledge of hallucination mitigation and designing safe AI solutions in regulated environments.
• Advanced proficiency with AI-assisted engineering tools and best practices.
• Ability to assess build-vs-buy tradeoffs among AI providers and third-party tools.
• Experience mentoring AI engineers and reviewing technical designs and code.

Nice to Have

• Certifications or experience in AI safety and compliance.
• Additional knowledge of AI evaluation harnesses and drift detection tools.

Language Required for the Role

• Fluent English, with excellent communication skills.

We Offer

• Competitive salary range: 5,040 - 5,880 (B2B)
• Gross salary range: 2,550 - 2,900 (Employment Contract)
• Fully remote work model
• Opportunity to work with cutting-edge AI technologies
• Professional development opportunities

About the Company

Our client is a global leader in AI innovation dedicated to transforming industries through advanced language models and intelligent automation. We are committed to pushing the boundaries of what’s possible with large language models and creating scalable, reliable AI systems.

Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

Internal number #9993