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 We’re helping businesses get off the ground by enabling them to focus on running their business. We’re data-driven and never stop iterating.

If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you These are best summed up in our company values, which are reflected in our product and in our team You will join a small, highly autonomous cross-functional team to build AI agents that fundamentally transform how operations work at scale. Instead of writing bespoke software for every workflow, we are developing an agent platform that can read operational knowledge, reason about it in context, and execute tasks end-to-end. We are seeking a Senior Software Engineer with a strong passion for building AI-native systems in a product environment.

The ideal candidate will be able to take ownership of large segments of the technology stack, make pragmatic technical decisions in ambiguous and emerging territory, and consistently ship high-quality, production-ready systems that our users rely on every day 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 Paid volunteer work Paid parental leave Work from home opportunities Medical, dental, and vision insurance, plus access to One Medical, Kindbody, and Teladoc All Justworks offers include equity, and Justworkers can continue to earn more over time with promotions and tenure Extensive learning & development opportunities through workshops, ExecOnline, Udemy, and BetterUp coaching Apprenticeship program that supports internal movement and growth You care more about solutions and impacting the customer experience than using a particular tool or frameworkYou are product-minded. You look beyond the immediate task, seeking to understand the “why” behind the build and questioning whether it’s the right product solution. You are comfortable contributing product thinking alongside engineering workYou possess strong backend engineering fundamentals.

You can confidently design, build, and operate production systemsYou are comfortable in a rapid-paced, early-stage environment. When encountering issues or ambiguity, you address them directlyYou 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 issuesYou are curious and eager to develop expertise in AI and LLMs. While deep research is not required, you are motivated to build practical, real-world products using these tools, specifically focusing on agent systemsHands-on experience with LLMs and AI agents (orchestration, RAG, tool/function calling, or similar)5+ years of backend engineering experience building and operating production systemsProduct-minded: questions requirements and contributes to product decisions, not just executionStrong API design and system integration skillsProven ownership of complex projects in ambiguous, early-stage environments #

📌 Senior Software Engineer (Artificial Intelligence) (Toronto)
🏢 Justworks
📍 Toronto