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Added 1 hour ago
AS
Applied Scientist, Demand Tech Planning
Amazon Science
Toronto, ON
- Full-time
…machine learning approaches including deep learning techniques, with insights delivered through agent-based tools and APIs that integrate seamlessly into user interfaces and programmatic…
Added 1 hour ago
P
Senior Software Engineer- Wireless (Contract)
Photon-IV
Canada
- Full-time
5+ years as a Software developer with startup scaling experience
Added 1 hour ago
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AI Architect (T & I) (Telework/Hybrid)
CBC/Radio-Canada
Ottawa, ON · Toronto, ON · Montreal, QC
- Full-time
Do you think you have the ability and drive to keep up with this exciting, ever-changing industry? Whether it be in front of the camera, on air, online or behind the scenes, you would be…
Added 1 hour ago
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Senior Privacy Engineer
DuckDuckGo
Remote, Canada
- $178,500 USD / year
- Full-time
- Remote
…optional AI, including Duck.ai, which lets you chat privately with ChatGPT, Claude, and other AIs, all in one place. Our culture of trust, inclusivity, and empowered project management…
Added 2 hours ago
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Senior Software Engineer (Full Stack)
Hudson Talent Solutions
Toronto, ON
- Full-time
Production experience with Node.js, Python, or Go.
Added 3 hours ago
HT
Staff Software Engineer, AI
Hudson Talent Solutions
Toronto, ON
- Full-time
The ideal candidate combines deep software engineering expertise with hands-on experience delivering AI products at scale.
Added 5 hours ago
AS
Machine Learning Engineer
AgileGrid Solutions
Canada
- Full-time
…computer vision, multimodal AI, or related fields. Proficiency with modern machine learning frameworks such as PyTorch or TensorFlow is essential. Candidates should have a passion for…
Added 5 hours ago
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Member of Technical Staff (Fullstack) (Toronto)
Solstice
Toronto, ON
- Full-time
Rapid growth: Over the past year, we have been working with some of the top life sciences manufacturers and are working with over 50+ pharma brands.
Added 5 hours ago
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Member of Technical Staff - Fullstack AI Engineer (Toronto)
Solstice
Toronto, ON
- Full-time
…APIs, agent orchestration, and customer-facing interfaces, with a strong focus on Python and platform…
Added 5 hours ago
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Senior Member of Technical Staff (Applied AI) (Toronto)
Solstice
Toronto, ON
- Full-time
Rapid growth: Over the past year, we have worked with some of the top life sciences manufacturers and over 50+ pharma brands including Pfizer and AstraZeneca.
Added 6 hours ago
AS
Senior Data Scientist
AgileGrid Solutions
Canada
- Full-time
…learning solutions. Strong programming skills are essential, with proficiency in languages such as Python, SQL, Rust, JavaScript, C, C++, SAS, or R. Experience working with relational…
Added 6 hours ago
OI
Développeur/Développeuse
Optisigma Inc.
Canada
- Full-time
A minimum of 5 years of experience within the last 10 years with Visual Studio (C#, .NET, Python) and Visual Studio Code (JavaScript, TypeScript, Node.js)
Added 8 hours ago
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Programmer
RI-MUHC | Research Institute of the MUHC | #rimuhc
Montreal, QC
- Full-time
…arm of the McGill University Health Centre (MUHC) affiliated with the Faculty of Medicine at McGill University. The RI-MUHC is supported in part by the Fonds de recherche du Québec - Santé…
Added 8 hours ago
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Patient Experience iCare Exchange Integrations Engineer
Sanofi
Toronto, ON
- Full-time
…data integration solutions that connect our iCare platforms with various data sources, ensuring seamless data flow while maintaining the highest standards of security and compliance. Your…
Added 10 hours ago
CI
Lead Engineer, Active Equities, Public Markets Technology
CPP Investments | Investissements RPC
Toronto, ON
- Full-time
With a long-term horizon and global reach, we deploy capital at scale across public and private markets. Our size, stability, and disciplined investment philosophy allow us to pursue…
Added 10 hours ago
SM
AI Engineer
S M Software Solutions Inc
Mississauga, ON
- Full-time
…Canada. The role focuses on designing, building, and deploying Python-based AI/LLM applications and scalable enterprise solutions, with responsibilities spanning AI-powered analytics, data…
Added 10 hours ago
SM
AI Engineer
S M Software Solutions Inc
Mississauga, ON
- Full-time
…Canada. The role focuses on designing, building, and deploying Python-based AI/LLM applications and scalable enterprise solutions, with responsibilities spanning AI-powered analytics, data…
Added 10 hours ago
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Senior AI/ML Engineer
RBC
Toronto, ON
- Full-time
Proficiency in programming languages such as Python, with experience in machine learning libraries (e.g., TensorFlow, PyTorch).
Added 10 hours ago
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Staff Cloud Security Engineer (Global Security)
RBC
Vancouver, BC · Toronto, ON
- Full-time
…RBC's Cloud Security posture. You will also contribute to the developer experience and foster a culture that encourages best security…
Added 10 hours ago
R
Senior Cyber Security Network Analyst (Global Security)
RBC
Toronto, ON
- Full-time
You will collaborate with teams within the unit to help meet their business objectives and implement changes to processes to increase agility and reduce costs within the unit.
Added 10 hours ago
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Senior Manager, ALM Market Risk
RBC
Toronto, ON
- Full-time
Excellent knowledge of MS Office applications, especially Excel and PowerPoint. Familiarity with SQL and relational databases, as well as programming languages (Python and Visual Basic) and…
Added 10 hours ago
R
Lead Full Stack Developer
RBC
Toronto, ON
- Full-time
Coding experience in Python; including experience with libraries such as Pandas or NumPy for data manipulation and visualization.
Added 10 hours ago
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AI Engineer
Workday
Vancouver, BC · Canada, BC, Vancouver
- Full-time
We’re obsessed with making hard work pay off, for our people, our customers, and the world around us. As a Fortune 500 company and a leading AI platform for managing people, money, and…
Added 11 hours ago
U
Full Stack Engineer
Ultrassure
Toronto, ON
- Full-time
We are a small, focused team in downtown Toronto. We ship every day, work closely with our customers and care more about building useful software than process for the sake of process.
Added 11 hours ago
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Principal, Total Portfolio Management Trading Desk
OPTrust
Toronto, ON
- Full-time
…a meaningful impact. Our culture is driven by team members with different backgrounds and perspectives creating an inclusive and fulfilling place to work for everyone. We work in a…

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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