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Member of Technical Staff - Fullstack AI Engineer (Toronto)

solsticeTorontoEngineering
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Salary
$155K to $230K,
Job type
Full-time
Experience
Senior · 5+ yrs
Posted
3 Oct 2026
Status
Open · checked 7d ago

About this role

Member of Technical Staff - Fullstack AI Engineer is an on-site position based in Toronto with Solstice, helping life sciences teams transform scientific information into marketing content. This role suits an experienced software engineer who wants to own product areas end to end and build foundational AI agent platforms.

Role Overview

Solstice is hiring a Member of Technical Staff - Fullstack AI Engineer in Toronto to build and maintain an agent platform and integrate its capabilities into customer-facing products. The Toronto team operates its own product area with a local roadmap, starting remotely with a WeWork stipend before moving into a dedicated Toronto office by the end of the year. The engineer will spend the first month working in person with the New York team, with travel and accommodation fully covered.

Key Responsibilities

Build and maintain the agent platform using Python, FastAPI, Restate, and Redis to handle session management, orchestration, tool access, and context delivery.
Design and implement Python and FastAPI services for document processing, content creation, collaboration, and enterprise integrations with PostgreSQL data models.
Solve complex execution challenges by making long-running workflows recover from failures, handle retries, and run securely within isolated environments.
Deliver user-facing interfaces with React, Next.js, and TypeScript to display streaming progress, handle reconnectable sessions, and allow users to review AI output.
Ensure system observability by connecting APIs and agent execution through Datadog, OpenTelemetry tracing, structured logs, and metrics.
Partner with Applied AI engineers on evaluations, regression checks, and testing using tools like Braintrust to improve agent behavior.
Take features from initial ideas to production deployment while collaborating with product and customer teams.

Requirements

Minimum of 5 years of software engineering experience building and shipping production software across backend services or fullstack applications.
Strong expertise in Python and FastAPI, including asynchronous programming, validation, authentication, and error handling for production services.
Solid understanding of systems fundamentals, service contracts, data models, PostgreSQL, Redis, concurrency, transactions, and failure recovery.
Experience building AI applications or infrastructure, including tool calling, context management, agent sessions, and application logic boundaries.
Proficiency across the full stack using React, Next.js, and TypeScript to connect user interfaces with backend APIs.
Ability to investigate production issues using traces, logs, and metrics while prioritizing testing, security, and maintainability.
Legal entitlement to work in Canada, as visa sponsorship is unavailable for this position.

Nice to Have

Experience with Restate or Temporal.
Background in sandboxed agent execution or streaming systems.
Familiarity with AI evaluation tools.
Prior experience in the healthcare or pharmaceutical industries.

Skills and Tools

Python
FastAPI
React
Next.js
TypeScript
PostgreSQL
Redis
Restate
OpenTelemetry
Datadog
Braintrust

Salary and Benefits

Base salary range of CAD $155,000 to $230,000 per year plus company equity.
Supplemental health, dental, and vision coverage in addition to OHIP.
RRSP matching program.
Unlimited paid time off.
First month spent working in New York with covered travel and accommodation.
Stipend for professional development and a WeWork stipend during the initial remote period.

About the Company

Solstice builds AI software designed to help life sciences manufacturers and pharmaceutical brands turn complex scientific and brand data into compliant marketing content. Backed by Transformation Capital, Twelve Below, Virtue, and founders from Datavant, Commure, and Paradigm, the company is expanding its engineering footprint by opening its first office outside New York in Toronto.

How to Apply

Interested candidates should visit the official Solstice careers page to apply for the position.

Skills and tech stack

PythonFastAPIReactNext.jsTypeScriptPostgreSQLRedisRestateOpenTelemetryDatadogBraintrust

Questions candidates ask

Where is this job located?

This role is on-site in Toronto. The team starts remotely for the first few months with a WeWork stipend before moving into a permanent Toronto office by the end of the year. The first month requires working in person with the team in New York, with travel and accommodation covered.

What is the salary range for this position?

The base salary range is CAD $155,000 to $230,000, complemented by company equity.

How many years of experience are required?

Candidates must have 5 or more years of software engineering experience building and shipping production software.

Is visa sponsorship available?

No, work permit sponsorship is not available for this role, and applicants must be legally entitled to work in Canada.

What technologies are used in the tech stack?

The core tech stack includes Python, FastAPI, React, Next.js, TypeScript, PostgreSQL, Redis, Restate, OpenTelemetry, Datadog, and Braintrust.

Ready to apply?

The application is on the official solstice careers page.

Apply on company site