Principal Software Developer

Arcadia; Toronto; Hybrid; CAD 170,000 - 175,000; Full time

Benefits offered by this job

10% bonus

RRSP

Full benefits

Flexible hybrid structure

Job summary

Arcadia in Toronto is seeking a Principal Software Developer to lead hands-on backend work using C# and .NET, shaping scalable systems that serve millions of customers in Canada and the US. You will design architectures, mentor engineers, and collaborate across product, QA, and security teams while advancing CI/CD, cloud-native microservices, and data strategies in a hybrid environment.

The ideal candidate has 12+ years of experience, deep system design skills, and a track record of delivering

Qualifications

• Deep hands-on experience with C# and .NET backend development.
• Experience at Principal/Lead/Staff level with system design.
• Cloud experience across AWS and/or Azure.
• Experience building microservices and APIs.
• Knowledge of CI/CD, Docker, Kubernetes, and DevOps.
• Strong secure coding and automated testing practices.
• Bachelor’s degree in CS/SE.

Responsibilities

• Design, build, and maintain scalable backend apps using C# and .NET.
• Lead technical design and implementation of complex software systems.
• Contribute to architecture across AWS and Azure.
• Build and modernize microservices, APIs, and enterprise integrations.
• Develop secure systems protecting customer data.
• Work with SQL and NoSQL databases for high-volume apps.
• Improve performance, reliability, and scalability.
• Support Docker and Kubernetes workloads; strengthen CI/CD.
• Write clean, testable production code and conduct code reviews.
• Mentor developers and set engineering standards.

Skills

C#

.NET

Backend development

Software architecture

Cloud computing

AWS

Azure

Microservices

APIs

DevOps practices

Unit testing (NUnit/MSTest)

Mentoring/leadership

Security practices

Financial services domain knowledge

Education

Bachelor’s degree in Computer Science or related field

Tools

Docker

Kubernetes

AWS

Azure

SQL

NoSQL

Job description

Location: Toronto, ON – flexible hybrid, ideally 1 or 2 day per week

Type: Full-Time

Comp: $170–175K + 10% bonus + RRSP + full benefits

A leading financial services organization in the consumer lending and alternative financial services space is hiring a Principal Software Developer to help modernize and scale its core technology platforms.

This is a deeply hands-on backend engineering role focused primarily on C# and .NET. You’ll design and build secure, scalable applications, contribute to system architecture, and help establish strong engineering practices across a complex cloud environment.

The organization is investing significantly in technology modernization, including cloud platforms, microservices, APIs, data capabilities, and customer-facing digital products. You’ll work closely with engineering, architecture, product, QA, and business stakeholders to deliver systems used by more than one million customers annually across Canada and the US.

What You’ll Do

• Design, build, and maintain scalable backend applications using C# and .NET
• Lead the technical design and implementation of complex software systems
• Contribute to application and platform architecture across AWS and Azure
• Build and modernize microservices, APIs, and enterprise integrations
• Develop secure systems that protect sensitive financial and customer data
• Work with SQL and NoSQL databases to support high-volume applications
• Improve application performance, reliability, maintainability, and scalability
• Support containerized workloads using Docker and Kubernetes
• Strengthen CI/CD pipelines, automated testing, and DevOps practices
• Write clean, efficient, and testable production code
• Conduct code reviews and establish engineering standards and best practices
• Troubleshoot complex production issues and drive long-term solutions
• Mentor senior and intermediate developers while remaining deeply hands-on
• Partner with product, QA, architecture, and business teams to translate requirements into technical solutions
• Evaluate emerging technologies and identify opportunities to improve platforms and development processes

What We’re Looking For

• 12+ years of professional software development experience
• Deep hands-on experience with C#, .NET, and backend application development
• Experience operating at a Principal, Lead, Staff, or Senior technical level
• Strong system design and software architecture capabilities
• Experience building microservices, APIs, and distributed applications
• Strong cloud experience across AWS and/or Azure
• Experience with relational and NoSQL databases
• Knowledge of CI/CD, Docker, Kubernetes, and modern DevOps practices
• Strong understanding of secure coding, automated testing, and code quality
• Experience with unit testing frameworks such as NUnit or MSTest
• Ability to influence technical decisions and communicate with both engineering and business stakeholders
• Experience mentoring developers and raising engineering standards
• Background in financial services, fintech, payments, or consumer lending is an asset
• Bachelor’s degree in Computer Science, Software Engineering, or a related field

Why Apply?

• Principal-level ownership while remaining deeply involved in the code
• Help modernize large-scale financial platforms used by more than one million customers annually
• Work across C#/.NET, AWS, Azure, microservices, APIs, and cloud-native technologies
• Influence architecture, engineering standards, and technical direction
• Flexible hybrid structure, ideally one day per week in Toronto
• Competitive compensation, 10% bonus, RRSP, and comprehensive benefits