Principal Software Engineer, Software Platform Engineering

Questrade Financial Group•Toronto, ON

1d•CA$135,000 - CA$165,000•Hybrid

About The Position

Questrade Financial Group (QFG) is seeking a Principal Software Engineer to join their Software Platform Engineering team. This role is a hands-on, leadership position where the engineer will define, design, and build the full stack, driving architectural decisions and writing code. The ideal candidate will be a catalyst for change, using AI to transform financial services and deliver unparalleled customer experiences. QFG emphasizes human-centric collaboration and AI-driven innovation in a diverse, inclusive, and hybrid workplace. This position offers real authority over technical direction and involves working closely with senior and principal engineers as peers. The role requires daily use of AI tools like Cursor, Claude, and Gemini to accelerate work and deliver at a high standard. The engineer will translate business problems into architectures, own solutions end-to-end, and collaborate with engineers and product leads to ensure successful implementation. The team ships frequently and takes engineering judgment seriously in product decisions.

Requirements

Active daily use of AI development tools like Cursor, Claude, and Gemini. This is a hard requirement.
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.
Comfortable with in-person collaboration in North York three days per week.

Nice To Haves

Experience with real-time technologies like WebSockets, gRPC, or Firebase.
Hands-on with Google Cloud Platform (GCP).
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.
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.
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.