Senior Backend Engineer

EWS Group; Toronto; Hybrid; CAD 130,000 - 170,000; Full time

Job summary

Jonas Software in Canada is seeking a Senior Backend Engineer to lead backend design for a new AI-first SaaS platform. You will build event-sourced, CQRS-based services in C#/.NET, craft clean domain models, and implement RabbitMQ-based integrations. The role emphasizes cloud-native delivery on AWS with Docker, ensuring scalability and reliability.

You will mentor others, define standards, and drive architectural decisions in a fast-paced team.

Qualifications

• Senior-level experience building production systems with C#/.NET.
• Hands-on with Event Sourcing and CQRS in real-world systems.
• Strong knowledge of Domain-Driven Design (DDD) and modular boundaries.
• Experience with cloud-native backend services on AWS and PostgreSQL.

Responsibilities

• Own major backend components of a new SaaS platform from design through production.
• Build event-sourced, CQRS-based services in C#/.NET using DDD.
• Design domain models, message contracts, and integration patterns with RabbitMQ.
• Deliver cloud-ready solutions with Docker and AWS; ensure observability and reliability.
• Apply AI-first approaches: agentic AI tools, automated workflows, and code-generation.

Skills

C#/.NET

Event Sourcing

CQRS

DDD

Vertical Slice

PostgreSQL

RabbitMQ

Docker

AWS

MartenDB

Wolverine

Tools

MartenDB

Wolverine

Job description

Senior Backend Engineer### Senior Backend EngineerApply: Remote Canada (ON): Full time: Posted 30+ Days Ago: R49905## ## 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 qualificationsRole Type: New RoleAI 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 asynchronous messaging and integration patterns, ideally **RabbitMQ*** Experience containerizing services with **Docker*** Experience building/operating cloud-hosted applications, ideally on **AWS*** Familiarity with **agentic AI concepts** (autonomous workflows, tool-using agents, orchestration, evaluation/guardrails) and excitement to apply them in day-to-day engineering* Strong ownership mindset: you ship, you improve, you operate, you lead**Nice to Have*** Experience with **MartenDB*** Experience with **Wolverine*** Experience designing multi-tenant SaaS systems (auth, billing, isolation, scaling, observability)* Familiarity with modern DevOps/IaC practices (e.g., Terraform/CDK), CI/CD, and distributed tracing#LI-VL1## ## Business Unit:Computrition - Canada## ## Scheduled Weekly Hours:37.5## ## Number of Openings Available:1## ## Worker Type:Regular## ## **More About Jonas Software:**Jonas Software is a leading provider of enterprise management software solutions, serving a wide range of vertical markets including hospitality, healthcare, construction, education, personal care, fitness, leisure, moving and legal services, to name a few. Within these markets, Jonas is comprised of over 65 distinct brands, each a respected leader in its domain.Jonas’ vision is to be the branded global leader across these verticals and to be recognized by customers and industry stakeholders as the trusted provider of “Software for Life.” We are committed to technology, product innovation, quality, and exceptional customer service.Jonas Software supports over 60,000 customers in more than 30 countries. We employ over 6,000 skilled professionals, including industry experts and technology specialists. Across our broader network, we support a global workforce of more than 30,000 employees.Headquartered in Canada, Jonas Software has a global footprint with offices around the world. We’re a 100% owned subsidiary of Constellation Software Inc., based in Toronto, publicly listed on the TSX (CSU.TO), and a member of the S&P/TSX 60 Index.### About UsAt Jonas we have long realized that our greatest asset is our employee base. As such we strive to provide our team with a fantastic working environment and an enriching career, which we know will translate into world class service to our valued clients. This allows Jonas Software to maintain and extend our lead as the premier software and services provider in each of our markets. If being part of a growing organization that moves at a fast pace and constantly strives to get better each and every day is what you are looking for, then we want to hear from you. Everyone has heard the sports analogy “to be the best, you have to beat the best”; well at Jonas Software we have tweaked that slightly to fit vertical market software. We believe to be the **best you have to hire and retain the best!!!***Jonas Software is an Equal Opportunity Employer.**If you need accommodation for a disability at any stage of the application process or want more information on our accommodation policies, contact recruitment at**[e-mail]**or 905-470-4600.**Jonas Software and its subsidiaries will never request payment, banking information, or sensitive personal documents from candidates at any stage of the application or interview process. Any such requests should be treated as fraudulent.**If you receive suspicious communication claiming to represent Jonas Software or one of our subsidiaries, please contact us at* *[e-mail]**.*Jonas Software is part of a CSI group of companies.