Senior Software Engineer, AI

Justworks
MX$2M - MX$2M/yr

AI Infrastructure

Tech Stack

About the Role

About the Role

You will join a cross-functional team developing AI agents that transform how operations work at scale. The platform reads operational knowledge, reasons contextually, and executes end-to-end tasks. The foundational team currently has fewer than five engineers working on LLM-powered agent design, backend architecture, tool development, and knowledge infrastructure.

Responsibilities

  • Design, build, and own core agent platform components from orchestration to tool integrations.
  • Build the capabilities layer including APIs, data access patterns, and service integrations.
  • Architect knowledge and memory infrastructure for agents to retrieve data across systems.
  • Design a trust and safety framework with audit trails, human controls, and AI guardrails.
  • Contribute to agent evaluation and testing infrastructure.
  • Partner with Operations to understand workflows and translate process knowledge into capabilities.
  • Mentor the growing engineering team.

About the Candidate

  • Comfortable in fast-paced environments; scrappy, resourceful approach to identifying solutions.
  • Pragmatic balance: optimizes for durability when needed; iterates quickly otherwise.
  • Product-minded: understands the "why" behind builds and questions product solutions.
  • Strong ownership: proactive gap identification; drives initiatives without explicit instruction.
  • Backend fundamentals: confidently designs and operates production systems.
  • AI curiosity: motivated to build practical products using LLMs and agent systems.

Qualifications

  • 5+ years backend engineering building and operating production systems.
  • Hands-on LLM and AI agent experience (orchestration, RAG, tool calling, or similar).
  • Strong API design and system integration skills.
  • Product mindset questioning requirements and contributing to decisions.
  • Proven ownership of complex projects in ambiguous, early-stage environments.

Technologies Used
Golang, Ruby on Rails, Javascript, Java, C#, Python, VueJS, MySQL, Kafka, AWS, Git, Memcache, Redis, ElasticSearch, Docker, Terraform, Kubernetes, CircleCI, DataDog.

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