Senior Software Engineer, Mortgage Engineering

Questrade Financial Group; Toronto; Hybrid; CAD 100,000 - 130,000; Full time

Benefits offered by this job

Health & wellbeing resources

Paid vacation and sick days

Competitive compensation and benefits

Hybrid work environment with at least

3 days in office

Career growth opportunities

Community involvement

Diverse, inclusive team

Job summary

Questrade Financial Group is hiring a Senior Software Engineer to own the end-to-end domain for Questbank's Secured Lending platform. You will design, implement, and review REST APIs in .NET/C#, work across a distributed microservices stack on GCP, and shape architectural choices that balance business needs with technical excellence.

You will influence architecture, lead design reviews, and collaborate with frontend teams using Angular/TypeScript, while implementing robust tests and CI/CD

Qualifications

• 5+ years of senior-level experience building backend REST APIs in .NET and C# in production.
• Strong knowledge of software design patterns including DDD, Event Sourcing and CQRS.
• Experience delivering distributed, microservices-based systems on cloud platforms (preferably GCP) with NoSQL/MongoDB.
• Proficiency in asynchronous (Pub/Sub) and synchronous (HTTP/REST) integration patterns.
• Frontend development experience with Angular/TypeScript; exposure to micro frontend architecture is a plus.
• Proven ability to write unit, integration, and automated tests and to maintain CI/CD workflows (GitLab).
• Hands-on production support and observability experience using tools like DataDog.

Responsibilities

• Own domain end-to-end including architecture decisions, code reviews, and production incidents.
• Lead design reviews and contribute to cross-team architectural decisions.
• Build and maintain production-grade REST APIs using .NET/C# across the stack, including micro frontends.
• Drive technical debt reduction while balancing short-term delivery with long-term maintainability.
• Champion testing standards with unit and integration tests as part of regular delivery.
• Own incidents and production issues end-to-end; use DataDog and observability tooling.

Skills

.NET

C#

DDD

Event Sourcing

CQRS

Microservices

GCP

Angular

TypeScript

Observability

Tools

MongoDB

GitLab

DataDog

Playwright

Cypress

Job description

Questrade Financial Group (QFG), through its companies - Questrade, Questbank, Questrade Wealth Management, Community Trust Company, Zolo, and Flexiti, provides securities and foreign currency investment, professionally managed investment portfolios, mortgages, real estate services, financial services and more. We use cutting‑edge technology to help Canadians become much more financially successful and secure.

At QFG, we combine human‑centric collaboration with AI‑driven innovation to redefine financial services. The ideal candidate will be a catalyst for change, using AI to transform and deliver unparalleled customer experiences and shaping a future where AI empowers our teams to do their best work.

Join our diverse, inclusive, and hybrid workplace to unleash your creativity and nurture your curiosity without limits. If you share this sense of infinite possibility, come shape your future at QFG.

This job posting is for an existing vacancy.

What’s in it for you as an employee of QFG?

• Health & wellbeing resources and programs
• Paid vacation, personal, and sick days for work-life balance
• Competitive compensation and benefits packages
• Work-life balance in a hybrid environment with at least 3 days in office
• Career growth and development opportunities
• Opportunities to contribute to community causes
• Work with diverse team members in an inclusive and collaborative environment

We’re looking for our next Senior Software Engineer. Could It Be You?

We're building the next-generation Loan Origination System for Questbank's Secured Lending business — a distributed, event-sourced platform that powers how we take a loan from application to funding. It's a microservices architecture on Google Cloud Platform (GCP), designed from the ground up with Domain-Driven Design, Event Sourcing, and CQRS. As a Senior Software Engineer on this team, you'll be a senior individual contributor who owns a domain end to end — from technical decisions, architecture, and code reviews to production incidents. You'll work across a .NET backend and an Angular frontend, shaping the technical direction of your domain and influencing architecture decisions across services. Operating in a complex, regulated financial services and mortgage servicing environment, curiosity about business context matters as much as technical skill: we need someone who thinks like an owner, understands the business problem behind the ticket, and helps shape the product rather than just executing work.

Need more details? Keep reading…

• Owning your domain end-to-end, taking direct accountability for architecture decisions, technical quality, code reviews, and production incidents.
• Owning the technical architecture within your domain — leading design reviews and contributing to cross-team architectural decisions
• Building and maintaining production‑grade REST APIs using .NET and C#; work across the stack including micro frontend components where needed
• Driving resolution of technical debt while balancing short-term delivery with long-term maintainability
• Championing testing standards and helping define the team's test culture — unit and integration tests are expected, not optional
• Owning incidents and production issues end-to-end; useing DataDog and observability tooling as standard practice
• Serving as the reference point for architectural patterns like CQRS, DDD, and event‑driven architecture — expected to evaluate and introduce tooling where there's clear benefit

So are YOU our next Senior Software Engineer? You are if you…

• Have 5+ years of senior-level experience building backend REST APIs in .NET and C# in production.
• Have strong expertise in software design principles and patterns, including Domain-Driven Design (DDD), Event Sourcing, and CQRS.
• Have experience architecting and delivering distributed, microservices-based systems with cloud infrastructure (ideally GCP) and NoSQL/MongoDB databases.
• Are proficient in both asynchronous (Pub/Sub messaging) and synchronous (HTTP/REST) integration patterns.
• Have frontend development experience with Angular or TypeScript (exposure to micro frontend architecture is a plus).
• Are committed to quality with a strong track record of writing unit, integration, and automated tests as part of regular delivery.
• Have hands‑on production support and observability experience, including CI/CD workflows (GitLab) and monitoring tools (DataDog).
• Have a product and business mindset: curiosity about business context in a complex, regulated domain (financial services / mortgage servicing) and the ability to clearly articulate technical and architecture decisions.
• Are familiar with AI‑assisted dev tools (GitHub Copilot, Claude, etc.) — the team actively uses these
• Tech stack at a glance
  • Backend: .NET
  • Frontend: Angular
  • Cloud: Google Cloud Platform (GCP)
  • Architecture: Distributed microservices, Domain-Driven Design, Event Sourcing, CQRS
  • Communication: Async (Pub/Sub), Sync (HTTP)
  • Testing: Automated tests across the stack; Playwright / Cypress an asset

Additional Kudos If You…

• Have experience with Playwright and/or Cypress for end-to-end testing.
• Have experience in financial services, fintech, lending, or mortgage/secured‑lending domains.
• Have experience in Micro frontend / module federation.

Compensation Information:

• Base salary range: $100,000 - $130,000
• The final compensation package will be commensurate with the successful candidate's experience, skills, and geographic location (Canada). It includes a comprehensive benefits plan and a competitive incentive (bonus) program for Full-Time Permanent roles.

At Questrade Financial Group of Companies, with multiple office locations around the world, we are committed to fostering a diverse, inclusive and accessible work environment. This is an environment where individuals are treated with dignity and respect. Here, the unique skills and experience you bring will be valued. You will be supported and motivated, so that you can harness your unlimited potential. Our team reflects the diversity of the communities we serve and operate in. Having a collaborative and diverse team helps us push boundaries to bring the future of fintech into existence—not only for the benefit of our customers, but for those who build their career with us. Questrade Financial Group of companies Applicant Tracking System utilizes artificial intelligence (AI) for application screening. The AI system operates on predetermined criteria, with final decisions subject to human review. Candidates selected for an interview will be contacted directly. If you require accommodation during the recruitment/selection process, please let us know and we will work with you to meet your needs.