Principal Software Engineer

Questrade Financial Group•Toronto, ON

10d•Hybrid

About The Position

Questrade Financial Group (QFG) provides securities and foreign currency investment, professionally managed investment portfolios, mortgages, real estate services, and financial services, leveraging cutting-edge technology. The company combines human-centric collaboration with AI-driven innovation to redefine financial services, aiming to deliver unparalleled customer experiences and empower teams through AI. QFG fosters a diverse, inclusive, and hybrid workplace. The Principal Software Engineer role is a hands-on position where the individual will own the full stack, define how it's built, and then build it. This includes leading solution design, driving architectural decisions, and writing production code. The role involves working alongside other senior and principal engineers, with an expectation of daily use of AI tools like Cursor, Claude, and Gemini to accelerate coding, design thinking, reviews, and documentation. The position requires translating business problems into architecture, owning solutions end-to-end, and collaborating closely with engineers and product leads. The Principal Software Engineer will have real authority over technical direction and will work with a team that ships frequently and values engineering judgment in product decisions. The role requires on-site presence at the North York office three days a week for in-person collaboration.

Requirements

Active daily use of AI development tools like Cursor, Claude, and Gemini. This is a hard requirement. If you’re not already using AI to code, review, and design faster, this role is not the right fit.
10+ years of professional software engineering experience with a track record of leading technical initiatives, not just contributing to them.
Demonstrated experience leading solution design for complex systems: facilitating architecture sessions, producing design documentation, and driving teams from ambiguity to executable plans.
Strong hands-on command of C# / .NET / ASP.NET Core and TypeScript, with experience in Angular and React Native (or a documented history of picking up frameworks fast).
Deep practical knowledge of Domain-Driven Design (DDD) and Event-Driven Architecture (EDA) applied in real production environments.
Ability to communicate technical decisions clearly to both engineers and product leads. You can go deep on implementation details with a developer and talk trade-offs with a PM without losing either audience.
Comfortable with in-person collaboration in North York three days per week. This role requires presence, not just availability.

Nice To Haves

Experience with real-time technologies like WebSockets, gRPC, or Firebase.
Hands-on with Google Cloud Platform (GCP), our cloud environment.
Complex query experience in analytical databases like BigQuery or Bigtable.
Contributions to open-source or a portfolio that demonstrates architectural thinking, not just shipping velocity.

Responsibilities

Use Cursor, Claude, and Gemini as part of your daily workflow to accelerate coding, design thinking, reviews, and documentation. Always looking for ways to go faster without cutting corners.
Lead end-to-end solution design for complex initiatives: facilitate technical discovery, define system boundaries, and produce architecture artifacts that the team can build confidently against.
Make the hard technical calls across back-end, web, and mobile, then implement them yourself in C# / .NET, Angular / TypeScript, and React Native. Architecture is not a document you hand off; it’s code you ship.
Work in-person with engineers and product leads to translate requirements into technical strategies, surface trade-offs early, and keep solutions aligned with product direction.
Collaborate with other senior and principal engineers to align on architecture, share ownership of hard problems, and hold each other to a high bar.
Lead design and architectural reviews, produce technical documentation, and hold yourself to a high bar from first design to production.