Senior AI Engineer — Build an Intelligent Agent Platform

Justworks; Ciudad de México; Presencial; MXN 1.562.000 - 2.017.000; Jornada completa

Descripción de la vacante

Justworks in Mexico City is seeking a Senior Software Engineer to join a small, autonomous team building AI-native systems that transform operations at scale. You will own core components of the agent platform and work across backend services, APIs, and tool integrations to deliver production-ready solutions.

You will mentor engineers, contribute to knowledge infrastructure, and help shape the architecture for robust, scalable AI-driven workflows in a fast-paced, early-stage environment.

Formación

• 5+ years of backend engineering experience building and operating production systems.
• Hands-on experience with LLMs and AI agents (orchestration, RAG, tool/function calling).
• Strong API design and system integration skills.
• Product-minded: questions requirements and contributes to product decisions.
• Proven ownership of complex projects in ambiguous, early-stage environments.

Responsabilidades

• Design, build, and own core components of the agent platform, from the orchestration layer to the tool integrations connecting it to internal systems.
• Build and evolve the capabilities layer: APIs, data access patterns, and service integrations for agents to execute operational workflows.
• Architect the knowledge and memory infrastructure, allowing agents to retrieve the data and act across our systems.
• Design and implement the trust and safety framework, including audit trails, human-in-the-loop controls, and guardrails for safe and auditable AI-driven operations.
• Contribute to agent evaluation and testing infrastructure, defining how we measure accuracy, reliability, and regression across agent behaviors.
• Partner directly with Operations to understand workflows, identify automation opportunities, and translate process knowledge into agent capabilities.
• Mentor other engineers on the team as it grows.

Conocimientos

Backend engineering

LLMs & AI agents

API design

Product mindset

Ownership

Herramientas

Golang

Ruby on Rails

Javascript

Java

C#

Python

VueJS

MySQL

Kafka

AWS

Git

Redis

Docker

Terraform

Kubernetes

CircleCI

DataDog

Descripción del empleo

Justworks in Mexico City is seeking a Senior Software Engineer to join a small, autonomous team building AI-native systems that transform operations at scale. You will own core components of the agent platform and work across backend services, APIs, and tool integrations to deliver production-ready solutions.

You will mentor engineers, contribute to knowledge infrastructure, and help shape the architecture for robust, scalable AI-driven workflows in a fast-paced, early-stage environment.