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Added 1 min ago
HT
Senior Software Engineer (Full Stack)
Hudson Talent Solutions
Toronto, ON
- Full-time
…delivery on Noetica, Thomson Reuters’ AI-powered deal intelligence platform. It is responsible for designing, building, and operating accurate, scalable, and well-architected…
Added 1 hour 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 1 hour ago
HT
Staff Software Engineer, AI
Hudson Talent Solutions
Toronto, ON
- Full-time
We're seeking a Staff Software Engineer, AI to help lead the design, development, and scaling of enterprise AI solutions at Thomson Reuters.
Added 2 hours ago
EI
Software Development Manager
EBlock Inc.
Canada
- $160,000 to $180,000 CAD / year
- Full-time
…Director of Product and Engineering. This is a role for an engineer who leads, not a manager who used to build. You will lead a team of seven to eight experienced engineers who already own…
Added 3 hours ago
Technical Inside Sales Specialist
Nanometrics Inc
Ottawa, ON
Synthesize frontline feedback to recommend hardware or solution improvements to the Solutions Engineer or Product Management, acting as the voice of the customer.
Added 3 hours ago
S
Member of Technical Staff (Fullstack) (Toronto)
Solstice
Toronto, ON
- Full-time
We're building Solstice to automate compliant, reference-backed pharma marketing. As a founding full-stack engineer on our Toronto team, you'll own core parts of the application stack,…
Added 3 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 7 hours ago
DC
Senior Water Resources Engineer
Dillon Consulting Limited
Guelph, ON · Hamilton, ON · Kingston, ON · Kitchener, ON · Oakville, ON · Toronto, ON · Windsor, ON · North York, ON
- Full-time
Dillon's Water Resources team is seeking a Senior Water Resources Engineer to become an integral part of our multidisciplinary group of professionals. This is your chance to dive into…
Added 8 hours ago
R
Senior Director, Program Delivery
RBC
Toronto, ON
- Full-time
…managing dependencies across research teams, engineering teams, platform groups, and business…
Added 8 hours ago
R
Senior AI/ML Engineer
RBC
Toronto, ON
- Full-time
Added 8 hours ago
R
Staff Cloud Security Engineer (Global Security)
RBC
Vancouver, BC · Toronto, ON
- Full-time
…across all tenants. In this role as a Staff Cloud Security Engineer, you will play a crucial role in developing innovative solutions to enhance RBC's Cloud Security posture. You will also…
Added 8 hours ago
R
Lead Full Stack Developer
RBC
Toronto, ON
- Full-time
…written primarily in C# and focused on .Net Core and cloud platform. The group is continuously working to improve our Agile, Engineering, and DevOps practices and this role will be expected…
Added 8 hours ago
W
AI Engineer
Workday
Vancouver, BC · Canada, BC, Vancouver
- Full-time
As an AI Engineer in Agent Factory, you’ll design and build the core ML systems behind Workday’s next generation of AI agents. Working within a small, senior, cross-functional pod, you’ll…
Added 8 hours ago
U
Full Stack Engineer
Ultrassure
Toronto, ON
- Full-time
Our platform, UltraContract, is used by insurance organizations across Canada, the United States, the United Kingdom, Bermuda and the Cayman Islands. More than $10 billion of premium…
Added 10 hours ago
M
Principal Software Engineer
Microsoft
Vancouver, BC
- Full-time
As a Principal Software Engineer, you will provide technical leadership for enabling and optimizing frontier-scale AI models on Microsoft AI accelerators. You will work across hardware…
Added 11 hours ago
L
Principal Engineer - Retail Systems
lululemon
Vancouver, BC
- Full-time
As a Principal Engineer, you will define the technical vision and implementation approach for major technology initiatives across lululemon’s global retail systems landscape. You will serve…
Added 11 hours ago
S
Technical Specifications Coordinator
SYSTRA
Montreal, QC
- Full-time
Professional Engineer (P.Eng.), Registered Architect, CSC certification, or eligibility considered an asset
Added 12 hours ago
Z
Senior Software Engineer, Developer Platform
Zip
Remote, Canada
- Full-time
- Remote
As a Senior Software Engineer on the Developer Platform team, you will be responsible for designing and building scalable architecture, tooling and processes that enable Zip’s engineers to…
Added 12 hours ago
T
Software Engineer I
TD
Toronto, ON
- Full-time
As a Software Engineer in the onboarding and compliancy team in business banking, you will contribute to the delivery and support of OBNC capabilities by owning engineering work across…
Added 12 hours ago
T
Data Platform Engineering Manager
TD
Toronto, ON
- Full-time
The Data Platform Engineering Manager role is responsible for designing, building, and operating the enterprise technology reference data platform that serves as the foundation for…
Added 13 hours ago
T
Data Architect, Technology Data Management
TD
Toronto, ON
- Full-time
Databricks Data Engineer or Architect Certification
Added 14 hours ago
M
Agentic Engineer, Innovation
Manulife
Montreal, QC
- Full-time
The Agentic Engineer, Innovation will design, build, and scale agentic AI solutions for Canada AI, helping translate high-value innovation opportunities into secure, reusable, and…
Added 14 hours ago
M
Senior Cloud Infrastructure Engineer
Mecka
Remote, Canada
- $165,000 to $200,000 CAD / year
- Full-time
- Remote
…builds and runs. We're hiring a Senior Cloud Infrastructure Engineer to help design, scale, and harden Mecka's AWS environment, with a focus on the networking and storage behind global data…
Added 14 hours ago
EM
AV Service Engineer - Control Systems & Device Integration
Evertz Microsystems Limited
Burlington, ON
- Full-time
Evertz AV is looking for a Service Engineer to join our AV Service team with a specific focus on Control System customization and deployment with a specific focus on VUE, our…
Added 15 hours ago
MC
Senior DevOps Engineer
Modern Campus
Canada
- Full-time
Modern Campus empowers institutions to move with confidence across the modern learner journey. Our platform spans web content management, curriculum and catalog management, student…

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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