Senior Software Engineer (AI)

Location: Hybrid role based in the Toronto office, Canada

Salary: $188,000–$242,000 CAD per year

Company

Justworks builds products that help businesses manage HR operations and focus on running their businesses.

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 capabilities, including audit trails, human-in-the-loop controls, and guardrails.
• Build evaluation and testing infrastructure to measure agent accuracy, reliability, and regressions.
• Partner with Operations to 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 and system integration skills.
• Experience owning complex projects in ambiguous, early-stage environments.
• Strong backend engineering fundamentals and a product-minded approach to technical decisions.
• Experience or interest in technologies such as Golang, Ruby on Rails, JavaScript, Java, C#, Python, MySQL, Kafka, AWS, Redis, Docker, Terraform, Kubernetes, CircleCI, and DataDog.

Culture & Benefits

• Work in a small, autonomous, cross-functional team of fewer than five engineers.
• Operate in a fast-paced, early-stage environment with an emphasis on ownership, pragmatism, and continuous iteration.
• Receive company benefits and wellness program offerings.
• Participate in company retreats and learn from leaders in the startup community.
• Join an inclusive workplace that values diversity and provides reasonable accommodations.