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Senior Software Engineer, Applied AI (Spain)

Justworks

Remote · Spain€9,250–11,917 gross/mofull-timeJustworks Careers

At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people.

Responsibilities

  • 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.
  • About the candidate
  • You are comfortable in a fast-paced, early-stage environment. You demonstrate a "scrappy" and resourceful approach, proactively identifying solutions and unblocking yourself without needing a fully defined path.
  • You are pragmatic and balance quality with speed. You understand when to optimize for long-term durability and when to iterate quickly. You prioritize pragmatism over being overly precious about code, but never compromise on quality in a way that creates future issues.

Languages

    Work format
    Remote
    Seniority
    Senior
    Posted
    21 May 2026
    Last verified
    In the last 5 days

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