Sr. AI/ML Engineer

Lead the future of AI/ML in a hands-on, ambiguity-friendly role — shape models, build NLP pipelines, and influence product direction with founders. Collaborative, impactful work.

About the Role

We are seeking a Senior AI/ML Engineer to lead the development of core machine learning systems and AI-driven automation. This role focuses on building and improving LLM-based systems, NLP pipelines, and intelligent workflows that transform complex, unstructured data into usable insights.

You will work directly with senior leadership to shape technical direction, define what should be built, and turn ambiguous product goals into real engineering solutions. This is a hands-on role for someone comfortable building in new and evolving problem spaces.

What You’ll Do

Lead the design and development of machine learning systems and LLM-based applications

Fine-tune and adapt large language models for domain-specific use cases

Build NLP pipelines to extract structured data from complex, unstructured documents

Translate ambiguous product goals into clear technical and ML execution plans

Work directly with product signals, user feedback, and backlog input to prioritize development work

Build evaluation systems to measure model performance and detect regressions

Design automated benchmarking pipelines for continuous model testing

Define meaningful performance metrics tied to real-world outcomes

Build feedback loops that use user corrections to continuously improve model performance

Apply computer vision techniques to extract data from PDFs and scanned documents

Develop AI agents that interact with web systems using automation tools such as Playwright or Selenium

Work across system design, infrastructure, training, and inference pipelines

Build scalable ML systems and supporting infrastructure from the ground up

How You’ll Succeed

Turn unclear problem spaces into structured, executable technical plans

Build systems that improve continuously through feedback and evaluation

Deliver reliable, production-ready AI/ML solutions in fast-changing environments

Balance experimentation with practical system design and scalability

Communicate clearly with technical and non-technical stakeholders

Make strong prioritization decisions when everything is not fully defined

Who You Are

6+ years of Python development experience

4+ years of experience in AI/ML engineering roles

Strong experience building and deploying LLM-based systems (e.g., Claude, OpenAI models)

Comfortable using modern LLM workflows such as prompting, evaluation, and iteration

Experience building NLP systems for information extraction or document understanding

Strong understanding of model evaluation, benchmarking, and performance measurement

Experience working with JavaScript/Node.js and React in production environments

Familiarity with MongoDB and AWS

Experience building systems that integrate feedback loops or continuous learning

Comfortable working in ambiguous environments without fully defined specifications

Strong communication skills (upper intermediate or higher English)

Position Details

Remote: fully

Location: State of São Paulo, San José, Santo Domingo, Buenos Aires, Santiago, Bogota, Quito, Guatemala City, Tegucigalpa, Lima, Montevideo Department, San Salvador, Mexico City, Panama City, Belize City

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