Senior AI Developer (Must: Golang)

Santex; A distancia; MXN 1,412,000 - 2,119,000; Jornada completa

Descripción de la vacante

A US-based global software company is seeking an experienced engineer to design and deploy AI-driven solutions for the American Express expense platform. The ideal candidate will have strong expertise in Golang and React, with a focus on AI/ML systems and cloud infrastructure. Responsibilities include developing LLM workflows and maintaining high standards for observability and performance in AI models. This role demands strong English communication skills and the ability to work in fast-paced environments.

Formación

• Strong proficiency in Golang (at least 5 years) and React.
• Experience with implementing LLMs, fine-tuning, and embeddings.
• Hands-on experience building production-level AI systems.
• Deep understanding of LLM mechanics and neural networks.

Responsabilidades

• Design, develop, and deploy AI-driven services for the expense platform.
• Focus on RAG, fine-tuning models, and building LLM workflows.
• Collaborate to deliver enterprise-grade solutions.

Conocimientos

Golang

React

LLMs

RAG

fine-tuning

cloud infrastructure

English communication

Descripción del empleo

Overview

Santex is a US-based global company founded in 1999, with 26 years of experience in the software industry. Headquartered in California with offices in Córdoba, Argentina, its talent network spans over 18 countries thanks to its flexible, remote-first culture. Santex specializes in custom enterprise software development, operating through Hubs that include eCommerce, BIM, Mobility, Content Delivery, Integration, Web & Mobile Development, Cloud Computing, Artificial Intelligence (AI), Data Science, IT Consulting, and Services. The company is committed to making a positive impact across three dimensions: economic, social, and environmental.

Responsibilities

• Design, develop, and deploy AI-driven services and workflows ("agents") for the American Express expense platform.
• Focus on RAG (Retrieval-Augmented Generation), fine-tuning models, and building robust LLM workflows in production.
• Develop solutions for features such as recommendations, predictions, chatbots for dashboard analytics, and smart receipt generation.
• Implement high standards for observability, testability, and metrics for all AI models and systems.
• Collaborate in a fast-paced environment to deliver enterprise-grade solutions.
• Maintain a strong focus on cloud infrastructure and scalable ML/system design.

Required Technical Skills & Experience

• Strong proficiency in Golang (at least 5 years) as a backend engineer and React. Prior non-AI-related Golang experience is acceptable.
• Strong applied experience with LLMs, RAG, fine-tuning, embeddings, and inference workloads.
• Hands-on experience building production AI systems (not only experimentation or prototypes).
• Strong knowledge of LLM mechanics, neural networks, prompting, embeddings, and evaluation.
• AI/ML Expertise: Deep understanding of the mechanics of LLMs, neural networks, training, fine-tuning, and AB testing/versioning models.
• Experience with cloud infrastructure and practical ML experience (especially for the Backend Platform Engineer role).
• Candidates must have experience implementing observability, testability, and metrics, as there is scrutiny on decisions made by AI models.

Soft Skills

• Strong ownership and autonomous execution.
• Ability to work in fast-paced, ambiguous environments.
• Team-first mindset with a focus on collaboration and communication.
• "Technical operator" mentality—able to design, build, and run production systems end-to-end.
• Strong professional working proficiency in English is required (Advanced English).
• Excellent English communication; prior experience working with US-based teams is a strong plus.