Sr AI Engineer

Rootstrap

Argentina/UruguayFreelance

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We're looking for a AI Engineer to join AI & Data Team. The Senior AI Engineer will lead the design, development, and deployment of cutting-edge AI solutions particularly those involving Large Language Models (LLMs), intelligent agents, and AI systems that integrate seamlessly into production-grade software. This person will work independently with minimal supervision while collaborating across teams to deliver intelligent, scalable, and reliable applications. They will be responsible not only for crafting models and prototypes, but also for embedding these into robust applications, building APIs, writing clean code, and ensuring the operational success of AI-powered features in real-world environments. The main objective of this role is to bridge AI innovation and software engineering excellence deploying LLMs, agents, and smart systems into full-stack products and production infrastructure. What are the main responsibilities of this role? Design and implement LLM-based solutions (e.g., RAG systems, multi-agent tools, copilots). Fine-tune, evaluate, and deploy open-source and proprietary foundation models. Build end-to-end AI-powered features in collaboration with product and engineering teams. Create scalable APIs and services to expose AI functionality to frontend/mobile clients. Own the lifecycle of AI features from experimentation to deployment and monitoring. Collaborate with DevOps to implement CI/CD pipelines and infrastructure-as-code for AI services. Implement observability, error tracking, and performance monitoring on deployed AI features. Evaluate and experiment with diverse AI frameworks and libraries (LangChain, Transformers, OpenAI SDKs, etc.). Lead technical discussions and mentor peers in AI best practices and architecture. Identify AI-driven product opportunities by working closely with clients or internal teams. Which skills and experience do we envision for this role? +4 years of experience in AI/ML-focused roles with shipped software products. Hands-on experience with LLMs (OpenAI, Claude, Mistral, open-source models) and agent frameworks (LangChain, AutoGPT, etc.). Proficiency in prompt engineering, vector databases (Pinecone, Weaviate, etc.), and embedding strategies. Experience with testing AI systems using tools such as Promptfoo, Giskard, etc Solid Python skills, with experience building APIs using FastAPI, Django, or similar. Production experience with cloud platforms (AWS, GCP, or Azure) and tools like Docker, Terraform, Kubernetes. Good software development practices: testing, code reviews, version control (Git), and modular design. Experience deploying and monitoring AI systems in production. Familiarity with MLOps and model deployment workflows is a plus. Join our team and enjoy: Access to Rootstrap University,Conferences/Certifications, and a Mentorship Program for your professional growth. Learning Bonus Opportunities to organize cross-functional initiatives and receive 360 Feedback to improve your skills continuously. The flexibility to work remotely or from our offices in Montevideo, Buenos Aires, and Medellín, with a flexible time schedule and Workation program. Gym benefits, psychological counseling, and weekly lunch reimbursements with special foods in the offices. An Onboarding kit and access to cutting-edge technologies and tools to make your work easier. Referrals program bonuses, After offices, Prizes, and special occasions gifts to celebrate your achievements. People Care referent to support your well-being and personal development. We value your well-being and happiness. We grow together! How we work: We offer a flexible and diverse work environment that fosters multicultural talent We value autonomy and creativity, We want people to bring ideas to the table and to think as leaders. We put our focus on real human connections We have a commitment to excellence At Rootstrap, we help companies launch, grow, and scale their digital products and services. With over 290 global team members, we’ve built solutions for industry leaders like MasterClass, Universal, and Google, as well as for innovative startups and inspired pioneers. Our team takes pride in making an impact that goes beyond the code, earning regular recognition as a Fastest Growing Company and Best B2B Service Provider. We embrace an AI-first mindset, continuously exploring how artificial intelligence can enhance the way we build products, solve problems, and deliver value. Across all stages of the development process, we encourage our teams to actively leverage AI to boost productivity and drive innovation. With offices in Uruguay, Argentina, and Colombia, we offer the flexibility to work remotely. Discover more about life at Rootstrap at https://www.rootstrap.com/careers . All of our candidate searches are covered under Uruguayan Law 19691 (the purpose of this law is to promote the inclusion of people with disabilities). As part of our Security and Compliance process, all seniority levels and roles must follow the company’s information security policies and secure development practices, and promptly report any suspected security incidents or vulnerabilities.

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