Senior AI Engineer: Build Scalable AI Systems & LLM Apps

Xtillion, LLC; San Juan, Northern (PR, KY); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical, dental and vision coverage

Paid time off

401(k) plan

Job summary

Xtillion, based in San Juan, Puerto Rico, seeks a Senior AI Engineer to design, build, and deploy intelligent systems addressing real business problems. You will work on LLM-powered applications, retrieval pipelines, predictive models, and data-driven automation in production-like client environments.

Ideal candidates combine software engineering rigor with applied AI expertise, collaborating with cross-functional teams to deliver measurable outcomes and high-impact solutions.

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, Data Science, or a related field.
• 4+ years of professional experience in software engineering, data science, ML engineering, or related technical discipline.
• Demonstrated experience building and deploying AI-enabled or data-intensive production systems.
• Experience with modern backend or data frameworks (e.g., FastAPI, Node.js).
• Strong experience with SQL and relational or analytical data systems.
• Experience working in cloud environments (e.g., AWS, Azure, GCP).
• Familiarity with Git-based version control, CI/CD pipelines, and modern development workflows.
• Strong written and verbal English communication skills.

Responsibilities

• Partner with clients and cross-functional teams to translate business problems into AI solutions, defining scope, success metrics, and technical approach.
• Design, build, and deploy AI-enabled applications, services, and workflows, including LLM-powered systems, retrieval pipelines, and intelligent automation.
• Develop and maintain the APIs, backend services, and data pipelines that power scalable AI and analytical systems.
• Drive model evaluation, prompt engineering, data preparation, and system testing to ensure quality, reliability, and continuous improvement.
• Contribute to infrastructure and deployment workflows for AI systems in cloud environments.
• Strengthen engineering culture through code reviews, architectural documentation, mentoring, and evolving team best practices.

Skills

Software Engineering

Data Science

ML Engineering

Backend Systems

SQL

Cloud Platforms

CI/CD

English Communication

Education

Bachelor’s degree in CS/Software Eng/Data Science

Tools

FastAPI

Node.js

Git

Docker

Kubernetes

AWS

Job description

Xtillion, based in San Juan, Puerto Rico, seeks a Senior AI Engineer to design, build, and deploy intelligent systems addressing real business problems. You will work on LLM-powered applications, retrieval pipelines, predictive models, and data-driven automation in production-like client environments.

Ideal candidates combine software engineering rigor with applied AI expertise, collaborating with cross-functional teams to deliver measurable outcomes and high-impact solutions.