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Added 2 hours ago
S
Member of Technical Staff (Fullstack) (Toronto)
Solstice
Toronto, ON
- Full-time
…for packaging and shipping LLM "agents" to production. Beyond development, you will be collaborating closely with co-founders Yiwen and Aris on all facets of the startup as we grow Solstice…
Added 2 hours ago
S
Member of Technical Staff - Fullstack AI Engineer (Toronto)
Solstice
Toronto, ON
- Full-time
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…
Added 2 hours ago
Account Manager
Ask-AI
Toronto, ON
…infrastructure, so each deployment builds on the last. Our no-code Agent Builder lets teams design and deploy agents with governance and traceability, while our Customer Context Model…
Added 2 hours ago
A
Sales Development Representative
Ask-AI
Toronto, ON
- Full-time
We're hiring a Sales Development Representative to open conversations with the leaders who run technical support at mid-market and enterprise companies. Most of your day is on the phone.…
Added 3 hours ago
MA
Sales Development Representative
Mosaic AI
Toronto, ON
- Full-time
We're hiring a Sales Development Representative to open conversations with the leaders who run technical support at mid-market and enterprise companies. Most of your day is on the phone.…
Added 3 hours ago
MA
Account Manager
Mosaic AI
Toronto, ON
- Other
…infrastructure, so each deployment builds on the last. Our no-code Agent Builder lets teams design and deploy agents with governance and traceability, while our Customer Context Model…
Added 6 hours ago
AC
Global Mobility Tax - Senior Manager
ACCA Careers
Calgary, AB
- Full-time
Vialto is a market leader in global mobility services. Our purpose is to ‘Connect the world’. We are unique and the only stand-alone global mobility business. This presents a rare…
Added 7 hours ago
U
Full Stack Engineer
Ultrassure
Toronto, ON
- Full-time
Use Codex and other AI development tools extensively as part of your daily workflow
Added 9 hours ago
PC
Risk Modelling Services, Actuarial P&C Director (Bilingual FR/EN)
PwC Canada
Toronto, ON
- Full-time
…Canadian P&C Actuarial practice by setting strategy, driving the development of new business and new services in the market, and providing technical advice across…
Added 9 hours ago
M
AI Business Solutions
Microsoft
Calgary, AB
- Full-time
…business requirements into prioritized Copilot scenarios and agent solutions, and drive deployment, active usage, adoption, and expansion across the customer's…
Added 12 hours ago
KI
Co-op/Intern AI Quality, Evaluation & Security
Kinaxis Inc.
Ottawa, ON
- Internship
Are you looking to join an innovative, market-leading company where you can truly elevate your career? At Kinaxis we are serious about culture, we are serious about technology, we are…
Added 13 hours ago
M
Agentic Engineer, Innovation
Manulife
Montreal, QC
- Full-time
Experience with LLMs, RAG, vector search, embedding models, agent frameworks, API integration, cloud-native development, CI/CD, and MLOps/LLMOps practices.
Added 14 hours ago
TN
Mortgage Agent
True North Mortgage
Windsor, ON
- Full-time
Fast paced environment, must be able to keep current with changes with lenders and the real estate market
Added 14 hours ago
TN
Mortgage Agent
True North Mortgage
Langley (District), BC · Langley, British Columbia
- Full-time
Fast paced environment, must be able to keep current with changes with lenders and the real estate market
Added 14 hours ago
TN
Mortgage Agent
True North Mortgage
Bedford, NS
- Full-time
Fast paced environment, must be able to keep current with changes with lenders and the real estate market
Added 14 hours ago
TN
Mortgage Agent
True North Mortgage
Calgary, AB
- Full-time
Fast paced environment, must be able to keep current with changes with lenders and the real estate market
Added 14 hours ago
TN
Mortgage Agent
True North Mortgage
Burnaby, BC
- Full-time
Fast paced environment, must be able to keep current with changes with lenders and the real estate market
Added 15 hours ago
QP
Manager, AI Delivery
QuadReal Property Group
Calgary, AB · Vancouver, BC · Toronto, ON
- Full-time
QuadReal Property Group is a global real estate investment, development and operating company headquartered in Vancouver, British Columbia. Its assets under management are $98.5 billion.…
Added 17 hours ago
TT
Loss Prevention Store Security Agent
The TJX Companies, Inc.
Fredericton, NB · Mississauga, ON · CAN Home Office Mississauga ON
- $37,590 to $52,626 CAD / year
- Full-time
We're seeking a Loss Prevention Store Security Agent to help create a safe, secure, and welcoming environment in our stores. In this impactful role, you’ll be instrumental in theft…
Added 20 hours ago
A
Associate Director-AI&Data
Accenture
Ottawa, ON · Montreal, QC
- Full-time
You will own Accenture's AI agenda in the Québec market: what we take to clients, how we deliver it, and the capability that sustains it.
Added 22 hours ago
F
Co-Founder & CEO - InsurTech | AI-Native Insurance Brokerage
FutureSight
Canada
- Full-time
Customer Development - Lead pilots with small business owners in certificate-heavy verticals, convert them to bound policies, and build the go-to-market motion
Added 1 day ago
C
Data Engineer
Citylitics
Remote, Canada
- Full-time
- Remote
…broadband, and power. It represents a multi-trillion-dollar market and a 20+ year megatrend in North…
Added 1 day ago
O
People Analytics & Automation Specialist
Opendoor
Toronto, ON
- Full-time
Compensation & Leveling: Own the execution side of compensation and leveling projects, comp benchmarking, market studies, leveling structures, and equity or compensation scenario planning,…
Added 1 day ago
CI
Data Engineer
Citylitics Inc.
Toronto, ON
- $70,000 to $80,000 CAD / year
- Full-time
…broadband, and power. It represents a multi-trillion-dollar market and a 20+ year megatrend in North…
Added 1 day ago
K(
Financial Controller
KITS.COM (TSX:KITS)
Vancouver, BC
- Full-time
Run regular one-on-ones, performance conversations, and development plans, and build coverage so no close area depends on one person.

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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