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About the Role
We're looking for a Fullstack AI Engineer to build and maintain our agent platform and bring its capabilities into the product. You'll own work across backend services, APIs, agent orchestration, and customer-facing interfaces, with a strong focus on Python and platform engineering. Python is our primary backend language, and FastAPI powers our APIs. You'll help decide how agents run, recover from failures, access tools and context, and communicate with the application. You'll also build the React and Next.js experiences that give users visibility and control over that work. You'll partner with product, design, Applied AI, and the broader engineering team to take problems from an initial idea through architecture, implementation, and production. The scope includes both building new capabilities and making the systems behind them easier to operate and extend.
Responsibilities
- Build and maintain the agent platform using Python, FastAPI, Restate, and Redis.
- Design APIs using Python and FastAPI for content creation, document processing, collaboration, and enterprise integrations.
- Solve agent execution challenges, including failure recovery, cancellation, retries, and isolated environments.
- Bring AI workflows to life in the product using React, Next.js, and TypeScript.
- Make the whole system observable using Datadog and OpenTelemetry.
- Partner with Applied AI engineers on evaluations and regression checks.
- Own the path from idea to production, including deployment, monitoring, and improvement.
Requirements
- 5+ years of software engineering experience, including building and shipping production software.
- Experience owning backend services or fullstack applications.
- Depth in Python and FastAPI, including 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 designing clear service contracts and data models.
- Comfort working with PostgreSQL and Redis.
- Ability to think through concurrency, transactions, idempotency, and failure recovery.
- Experience turning AI into useful software, including building AI applications or their infrastructure.
- Ability to reason about tool calling, context management, agent sessions, and the boundaries between model behavior and application logic.
- Comfort working in React, Next.js, and TypeScript and connecting interfaces to backend APIs.
- A habit of making systems understandable using traces, logs, and metrics.
- Experience with testing, security, and maintainability.
- Ownership and good judgment, with the ability to turn ambiguous problems into practical plans.
- Ability to work closely with others, seek feedback, and focus on solving customer problems.
- Must be legally entitled to work in Canada.
- Cannot sponsor work permits for this role.
Skills
- Python
- FastAPI
- React
- Next.js
- TypeScript
- PostgreSQL
- Redis
- Datadog
- OpenTelemetry
- Restate
- Temporal
- Braintrust
Location
- Toronto
- New York
Work Type
- On-site
- Remote
Experience Level
- 5+ years
Salary/Compensations
- CAD $155,000 to $230,000
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
About the Company
- Solstice is building AI software that helps life sciences teams turn complex scientific and brand information into marketing content.
- We've worked with leading life sciences manufacturers and more than 50 pharma brands.
- We're backed by Transformation Capital, Twelve Below, Virtue, and the founders of Datavant, Commure, and Paradigm.
- We're opening our first engineering office outside New York, in Toronto.