Senior Software Engineer (AI)

Location: Hybrid or remote, with the position based in The Netherlands

Salary: €143,000–€184,000 per year

Company

Justworks provides a data-driven HR platform that helps businesses manage operational and HR-related needs.

What you will do

• Design, build, and own core components of an AI agent platform, including orchestration and internal tool integrations.
• Develop APIs, data access patterns, and service integrations that enable agents to execute operational workflows.
• Architect knowledge and memory infrastructure for data retrieval and cross-system actions.
• Implement trust and safety controls, audit trails, human-in-the-loop workflows, and guardrails.
• Build evaluation and testing infrastructure to measure agent accuracy, reliability, and regressions.
• Partner with Operations, identify automation opportunities, translate workflows into agent capabilities, and mentor engineers.

Requirements

• 5+ years of backend engineering experience building and operating production systems.
• Hands-on experience with LLMs and AI agents, including orchestration, RAG, or tool and function calling.
• Strong API design, backend engineering, and system integration skills.
• Experience owning complex projects in ambiguous, early-stage environments.
• Product-minded, pragmatic, self-directed, and comfortable making technical decisions in emerging areas.
• Relevant technologies include Golang, Ruby on Rails, JavaScript, Java, C#, Python, VueJS, MySQL, Kafka, AWS, Redis, Elasticsearch, Docker, Terraform, Kubernetes, CircleCI, and Datadog.

Nice to have

• Experience building practical AI-native products and agent systems.
• Experience mentoring engineers in a growing team.

Culture & Benefits

• Supportive, entrepreneurial, and casual working environment.
• Small, autonomous, cross-functional foundational team.
• Benefits, wellness program offerings, and company retreats.
• Opportunities to learn from leaders in the startup community.
• Commitment to diversity, inclusion, and reasonable accommodations.