Senior Backend Engineer - Jonas Software

Job Description:

Senior Software Engineer (AI-First, Agentic AI)

Remote Canada

Compensation & Role Details

Expected Salary Range: $130,000 - $170,000 CAD, depending on experience and qualifications

Role Type: New Role

AI Disclosure: AI is used to screen, assess, or select applicants for this role

Overview

We’re a software company at the start of building a brand-new, highly visible SaaS application. This is a rare opportunity to help shape the technical foundation: you’ll help set technical direction, establish engineering standards, and ship foundational capabilities that will shape the product for years. We’re looking for a motivated senior engineer who thinks and builds with an AI-first mindset —someone excited about agentic AI workflows, automation, and using modern AI tooling to accelerate delivery without compromising quality. This project will be using AI-Development Life Cycle (AI-DLC) to drive the creation, testing and deployment of this application. This is a tremendous opportunity to be fully supported in an AI first approach.

In this role, you’ll design and implement core backend systems using .NET/C# and proven architectural patterns such as Event Sourcing, CQRS, Domain-Driven Design (DDD), and Vertical Slice (vertical event-sourced) architectures . You’ll work in a cloud-native environment leveraging AWS , PostgreSQL , RabbitMQ , and Docker , contributing to a platform built for scale, reliability, and rapid iteration. You’ll also be a technical leader—taking ownership, mentoring others, and helping define best practices for a high-performing team.

Responsibilities

Own major components of a new SaaS platform from design through production

Build event-sourced, CQRS-based services in C#/.NET using DDD principles

Design clean domain models, message contracts, and integration patterns using RabbitMQ

Deliver cloud-ready solutions using Docker and AWS (deployment, observability, reliability)

Apply an AI-first approach to engineering: agentic AI tools, automated workflows, code generation/review, test generation, and productivity accelerators

Partner with product and engineering leaders to define architecture, standards, and delivery practices

Write high-quality, well-tested, maintainable code and raise the bar through reviews and mentorship

Must Have

AI-first mentality with practical experience using AI tools to accelerate development

Senior-level experience building production systems with C#/.NET

Hands-on experience with Event Sourcing and CQRS in real-world systems

Strong working knowledge of Domain-Driven Design (DDD)

Experience with Vertical Slice architecture (or similar modular service boundaries)

Solid experience with PostgreSQL

Experience with