Member of Technical Staff - Fullstack AI Engineer (Toronto)

The role

You will build and maintain an agent platform and bring its capabilities into the product. This involves working across backend services, APIs, agent orchestration, and customer-facing interfaces using Python and React.

What you will do

• Build and maintain the agent platform using Python, FastAPI, Restate, and Redis.
• Design APIs for content creation, document processing, collaboration, and enterprise integrations.
• Solve agent execution challenges including failure recovery, cancellation, and retries.
• Build React, Next.js, and TypeScript interfaces to show streaming progress and tool activity.
• Connect APIs, orchestration, and agent execution through Datadog and OpenTelemetry.
• Partner with Applied AI engineers on evaluations and regression checks.
• Own the path from idea to production by deploying, monitoring, and improving features.

Required qualifications

• 5+ years of software engineering experience.
• Experience building and shipping production software and owning backend services or fullstack applications.
• Depth in Python and FastAPI.
• Experience shipping and operating production Python services.
• Ability to build well-designed FastAPI APIs and understand asynchronous programming, validation, authentication, and error handling.
• Strong systems fundamentals including PostgreSQL and Redis.
• Ability to design clear service contracts and data models.
• Experience building AI applications or the infrastructure behind them.
• Ability to work in React, Next.js, and TypeScript.
• Ability to use traces, logs, and metrics to investigate production issues.

Nice to have

• Experience with Restate or Temporal
• Experience with sandboxed agent execution
• Experience with streaming systems
• Experience with AI evaluation tools
• Healthcare or pharma experience

Benefits

• Supplemental health, dental, and vision coverage on top of OHIP
• Equity in an early-stage company
• RRSP matching
• Unlimited paid time off
• First month in New York with travel and accommodation covered
• Stipend for professional development

Before you apply

• You must be legally entitled to work in Canada.
• We can't sponsor work permits for this role at this time.

About the company

Solstice builds AI software that helps life sciences teams turn complex scientific and brand information into marketing content. They are backed by Transformation Capital, Twelve Below, Virtue, and the founders of Datavant, Commure, and Paradigm.