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Senior Software Engineer, AI (remote - Spain)

3 months, 3 weeks ago
Spain
Full-time
Senior
Software Engineer
Software Development
AWS C# CircleCI Datadog Docker Elasticsearch Git Go Java JavaScript Kafka Kubernetes LLM Microservices MySQL Python Redis Ruby on Rails Terraform Vue.js
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Justworks

Justworks

Justworks offers simple PEO & payroll solutions for small businesses, handling payroll, benefits, HR, and compliance in one platform to free entrepreneurs to focus on growth.

Professional Services
1K-5K
Founded 2012
$143M raised
View All Jobs 6

Description

  • Design, build, and own core components of the agent platform, including the orchestration layer and tool integrations with internal systems.
  • Build and evolve the capabilities layer, including APIs, data access patterns, and service integrations for agent-driven workflows.
  • Architect the knowledge and memory infrastructure that enables agents to retrieve data and act across company systems.
  • Design and implement trust and safety mechanisms, including audit trails, human-in-the-loop controls, and guardrails.
  • Contribute to agent evaluation and testing infrastructure to measure accuracy, reliability, and regressions.
  • Partner with Operations to understand workflows, identify automation opportunities, and translate process knowledge into agent capabilities.
  • Mentor other engineers as the team grows.

Requirements

  • 5+ years of backend engineering experience building and operating production systems.
  • Hands-on experience with LLMs and AI agents, including orchestration, RAG, tool/function calling, or similar.
  • Strong API design and system integration skills.
  • Product-minded approach with the ability to question requirements and contribute to product decisions.
  • Proven ownership of complex projects in ambiguous, early-stage environments.
  • Experience building and maintaining large-scale, complex applications.
  • Comfort working in a fast-paced, early-stage environment with a scrappy, resourceful approach.
  • Familiarity with the listed technologies, including Golang, Ruby on Rails, JavaScript, Java, C#, Python, VueJS, MySQL, Kafka, AWS, Redis, ElasticSearch, Docker, Terraform, Kubernetes, CircleCI, and DataDog.
  • Ability to make pragmatic technical decisions while balancing speed and long-term quality.

Benefits

  • Base salary range of 111,000-143,000 EUR for Spain-based candidates.
  • Welcoming, casual work environment.
  • Great benefits package.
  • Wellness program offerings.
  • Company retreats.
  • Hybrid work arrangement indicated by the posting.
  • Opportunities to interact with and learn from leaders in the startup community.
  • Commitment to total rewards and additional perks and benefits through Justworks' Total Reward Philosophy.

Interested in this position?

Apply directly on the company website

Apply Now

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