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Added 18 mins ago
J
Power Engineer - Second Class
Jobbe
Grand Falls, NB
- Part-time
McCain Foods (Canada) is seeking an On-call Power Engineer to join our Fry Plant facility in Grand Falls, New Brunswick. This role is responsible for the safe and efficient operation,…
Added 48 mins ago
GC
AI Engineer
GEI Consultants, Inc.
Markham, ON
- $110,000 to $150,000 CAD / year
- Full-time
The AI Engineer is responsible for the development of AI solutions, typically leveraging pretrained models and copilots, to support GEI’s priority digital and AI initiatives. This role…
Added 1 hour ago
KC
Site Reliability Engineer
KPMG Canada
Kitchener, ON
- Full-time
The OPS Site Reliability Engineer will be a focal role owning and ensuring the fluent operations of Managed Services offerings in the KPMG production cloud environment. The role will be…
Added 2 hours ago
AG
Senior Operations Technology Specialist
Artemis Gold - Blackwater Project
BC
- Other
…silver pour at Blackwater was achieved in 2025 and commercial production was declared on May 1, 2025. Artemis Gold trades on TSX-V under the symbol ARTG. For more information visit…
Added 9 hours ago
BG
Process Engineer, Production
BV GLAZING
Concord, ON
- $85,000 to $95,000 CAD / year
- Full-time
THE OPPORTUNITY: The Process Engineer is responsible for driving operational excellence across multiple manufacturing facilities within our Concord campus. This role focuses on optimizing…
Added 9 hours ago
UA
Software Engineer Intern - QuantumBlack, AI by McKinsey at McKinsey & Company
UCI-OC Alliance
Engineer, BC
- Volunteer
…solutions. You'll help build robust technical foundations for production-ready, AI-enabled systems. Your contributions will directly support the firm's ability to accelerate AI adoption,…
Added 9 hours ago
PA
Maintenance Operational Controller
PROVINCIAL AEROSPACE LTD
NL
- Full-time
Coordinate and communicate with Flight Operations, Maintenance Production, and Planning to ensure availability of aircraft in conjunction with the planned flight schedules and the Aircraft…
Added 10 hours ago
AM
Software Engineer, AI & Engineering Productivity Tools
Advanced Micro Devices, Inc
Markham, ON
- Full-time
AMD is seeking a Software Engineer, AI & Engineering Productivity Tools to build platforms, automation, and AI-powered tools that improve engineering productivity across ASIC design and…
Added 12 hours ago
I
Process/Project Engineer
Innophos
Port Maitland, ON
- $90,000 to $105,000 CAD / year
- Full-time
The Process/Project Engineer is primarily responsible for project development, estimation, planning, and execution. In addition, they are responsible for conducting engineering studies…
Added 12 hours ago
CH
Injection Molding Assistant Supervisor
Canadian Hospital Specialties
Mississauga, ON
- Full-time
Troubleshoot production issues and work with maintenance and Manufacturing Engineer to minimize downtime.
Added 12 hours ago
CH
Injection Molding Assistant Supervisor
Canadian Hospital Specialties
Mississauga, ON
- Full-time
Troubleshoot production issues and work with maintenance and Manufacturing Engineer to minimize downtime.
Added 13 hours ago
WF
Head Electrician
West Fraser
Edson, AB
- Full-time
Work collaboratively with Production, Technical and Purchasing departments to effectively maintain mill equipment
Added 13 hours ago
E
Intermediate/Senior Instrumentation & Controls Engineer
Engcomp
Saskatoon, SK
- Full-time
As an instrumentation and controls engineer, you will leverage your expertise to lead and support a variety of engineering initiatives across different sectors. From concept to execution,…
Added 14 hours ago
SM
AI Engineer
S M Software Solutions Inc
Mississauga, ON
- Full-time
Experience with testing, production support, and system reliability.
Added 14 hours ago
SM
AI Engineer
S M Software Solutions Inc
Mississauga, ON
- Full-time
Experience with testing, production support, and system reliability.
Added 14 hours ago
SM
AI Engineer
S M Software Solutions Inc
Mississauga, ON
- Full-time
Experience with testing, production support, and system reliability.
Added 17 hours ago
P
Senior Software Engineer- Wireless (Contract)
Photon-IV
Canada
- Full-time
Joining the company means contributing to cutting-edge communication systems that support critical missions. Team members collaborate in a multidisciplinary environment that values…
Added 17 hours ago
A
New Graduate, Mechanical Engineering (2027)
AtkinsRéalis
Calgary, AB · Vancouver, BC · Winnipeg, MB · Bedford, NS · Toronto, ON
- Full-time
Design and manufacturing: Development of products, machines and equipment, from design to production.
Added 17 hours ago
A
Civil Structural Engineer
AtkinsRéalis
Montreal, QC
- Full-time
AtkinsRéalis is looking for a civil / structural engineer to join a team dedicated to engineering works mainly targeting hydroelectric projects and who will be able to use his or her…
Added 17 hours ago
A
Smart 3D Administration and Support Specialist
AtkinsRéalis
Mississauga, ON
- Full-time
The Smart 3D (SP3D) Support Specialist supports the Hexagon Smart 3D application in a project environment with regards to the following: User support, Project support, SP3D project…
Added 19 hours ago
S
Project Engineer
Shell
Sarnia, ON
- Full-time
Shell is seeking for Project Engineer to join its team in Sarnia.
Added 19 hours ago
MA
Solutions Engineer
Mosaic AI
Toronto, ON
- Full-time
Mosaic AI is the only enterprise AI platform built for technical support in highly configurable, multi-product companies. We unify the customer, product, and support context scattered…
Added 19 hours ago
S
Industrial Designer
Sevens™
Canada
- Part-time
Support the transition from an initial prototype toward a production-oriented design.
Added 19 hours ago
HT
Staff Software Engineer, AI
Hudson Talent Solutions
Toronto, ON
- Full-time
This is a senior technical leadership role focused on building production-grade AI systems, RAG architectures, agent-based workflows, and LLM-powered applications that support legal, tax,…
Added 19 hours ago
IO
Upstream Engineer - Students Seeking Opportunities
Imperial Oil
Calgary, AB
- Full-time
…maintenance, technical specialists, and geoscience professionals to support safe, reliable, and efficient operations. You'll have the opportunity to apply your technical knowledge to…

Solstice

Member of Technical Staff - Fullstack AI Engineer (Toronto)

Toronto, ON, Canada

Full-time

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Job details

Job type: Full-time
Experience: 5+ years of software engineering experience.
Posting language: English
Posted: Oct 3, 2026

Original job description

WHY YOU SHOULD JOIN US

At Solstice, we're building AI software that helps life sciences teams turn complex scientific and brand information into marketing content they can create, refine, and review with confidence. We've worked with leading life sciences manufacturers and more than 50 pharma brands. You'll build the systems and experiences that make this work faster and easier.

Build the foundation for how people work with AI. Your work will span the infrastructure that runs agents and the product experiences that help customers direct, inspect, and use their output.
Take on engineering problems with depth. Make long-running agents reliable, stream progress into responsive interfaces, deliver the right context securely, and understand what happens across every step of execution.
Have a direct hand in what we build. Join an early team where you'll shape architecture, make product tradeoffs, and work closely with our co-founders, Yiwen and Aris. You'll see your decisions reach customers and use their feedback to improve the product.

We're backed by Transformation Capital, Twelve Below, Virtue, and the founders of Datavant, Commure, and Paradigm.

SOLSTICE IN TORONTO

We're opening our first engineering office outside New York, in Toronto, and you'll be one of its first engineers. The Toronto team will own a product area end to end, with its own roadmap and on-call. It won't be a queue for work handed over from New York.

Same time zone as New York, and one of our co-founders will be in Toronto with the team.
You'll spend your first month in New York working alongside the team in person. We cover travel and accommodation.
This role will be on-site in Toronto. We'll start remotely for the first few months, with a WeWork stipend for those who prefer it. As the team grows, we'll move into our own Toronto office by the end of the year and work from there five days a week.

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.

WHAT YOU'LL BE WORKING ON

Build and maintain the agent platform. Use Python, FastAPI, Restate, and Redis to build the shared systems that power our agents. Shape session management, orchestration, tool access, and context delivery so new AI capabilities can build on a dependable foundation.
Design APIs that power the product. Build Python and FastAPI services for content creation, document processing, collaboration, and enterprise integrations. Design clear API contracts and PostgreSQL data models that make complex workflows straightforward to build on.
Solve the hard parts of agent execution. Make long-running workflows recover from failures, handle cancellation and retries, and run in isolated environments. Give agents current documents, assets, and brand context while keeping customer data and permissions properly scoped.
Bring AI workflows to life in the product. Build with React, Next.js, and TypeScript to show streaming progress and tool activity, support reconnectable sessions, and give users intuitive ways to review, accept, or refine AI output.
Make the whole system observable. Connect APIs, orchestration, and agent execution through Datadog and OpenTelemetry tracing, structured logs, metrics, and alerts. Build the visibility to explain failures, find bottlenecks, and improve latency, reliability, and cost.
Make quality measurable. Partner with Applied AI engineers on evaluations and regression checks, using tools such as Braintrust alongside API and integration tests. Turn production traces and customer feedback into better agent behavior and more dependable releases.
Own the path from idea to production. Work with product and customer teams to choose the right problems, make practical tradeoffs, and ship complete features. Deploy, monitor, and improve what you build as customers use it.

SOME IDEAL TRAITS WE'RE LOOKING FOR

5+ years of software engineering experience. You've built and shipped production software, with experience owning backend services or fullstack applications.
Depth in Python and FastAPI. You've shipped and operated production Python services. You can build well-designed FastAPI APIs and understand asynchronous programming, validation, authentication, and error handling.
Strong systems fundamentals. You design clear service contracts and data models, work comfortably with PostgreSQL and Redis, and think through concurrency, transactions, idempotency, and failure recovery.
Experience turning AI into useful software. You've built AI applications or the infrastructure behind them. You can reason about tool calling, context management, agent sessions, and the boundaries between model behavior and application logic.
The ability to deliver across the stack. You're comfortable working in React, Next.js, and TypeScript and connecting an interface to backend APIs. You care about how the product feels, including usability, accessibility, and performance.
A habit of making systems understandable. You use traces, logs, and metrics to investigate production issues and build instrumentation that helps the next engineer diagnose them. Testing, security, and maintainability are part of how you ship.
Ownership and good judgment. You can turn an ambiguous problem into a practical plan, explain the tradeoffs, and follow through. You work closely with others, seek feedback, and care about whether your work solves the customer's problem.

Experience with Restate or Temporal, sandboxed agent execution, streaming systems, or AI evaluation tools is a plus. You don't need experience with every tool in our stack. We value strong fundamentals and the ability to learn quickly. Healthcare or pharma experience is welcome but not required.

BENEFITS

Supplemental health, dental, and vision coverage on top of OHIP
Equity in an early-stage company, granted on the same schedule as our New York team
RRSP matching
Unlimited paid time off
Your first month in New York, with travel and accommodation covered
A stipend for professional development

COMPENSATION

The base salary range for this role is CAD $155,000 to $230,000, plus equity. Where you land depends on your experience, seniority, and the scope of responsibility you take on. We pay at the top of the Toronto market, and we grant equity on the same schedule in every office.

This posting is for an existing vacancy. You must be legally entitled to work in Canada. We can't sponsor work permits for this role at this time.

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More about this job

Responsibilities

You will build and maintain the agent platform, owning backend services, APIs, and customer-facing interfaces. You will also collaborate with product and design teams to implement new AI capabilities and ensure system observability and reliability.

Requirements

The role requires 5+ years of software engineering experience with deep expertise in Python and FastAPI. Candidates must be proficient in fullstack development using React, Next.js, and TypeScript, along with strong systems fundamentals.

Skills

Python
FastAPI
React
Next.js
TypeScript
PostgreSQL
Redis
Agent orchestration
Systems architecture
API design
Datadog
OpenTelemetry
Cloud infrastructure
Software engineering
Fullstack development

Benefits

Supplemental health coverage
Dental coverage
Vision coverage
Equity
RRSP matching
Unlimited paid time off
Travel and accommodation for onboarding
Professional development stipend

Visa sponsorship

Not detected in the job text

Hiring contact

Yiwen

Keywords

Python
FastAPI
React
Next.js
TypeScript
PostgreSQL
Redis
Restate
Temporal
Datadog
OpenTelemetry
AI
Machine Learning
Agent orchestration
Fullstack
API
Software Engineering
Life Sciences
Pharma
Braintrust
Cloud
Infrastructure
System design
Asynchronous programming
Authentication
Observability
Metrics
Logs
Tracing
Product development

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