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Aptino, Inc.

Senior Dotnet Developer

Montreal, QC, Canada

$45 to $50 CAD / hour · Contract

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Job details

Pay: $45 to $50 CAD / hour
Job type: Contract
Apply by: Dec 4, 2026
Experience: 5+ years of hands-on experience in Microsoft .NET technologies.
Posting language: English
Posted: Nov 4, 2026

Original job description

We are looking for an experienced Senior .NET Developer to design, develop, maintain, and modernize enterprise applications. The ideal candidate will have strong hands-on experience with C#, .NET Core, API development, Windows applications, application troubleshooting, and enterprise integrations.

Key Responsibilities

Design, develop, implement, and maintain enterprise applications using C# and .NET/.NET Core.
Support and modernize legacy applications while improving performance, stability, and maintainability.
Develop and integrate REST APIs, SOAP web services, HTTP services, and XML-based integrations.
Troubleshoot application issues, perform root cause analysis, and resolve security vulnerabilities.
Support applications running on Windows 10/11, Windows Server, cloud, and container platforms.
Work with OpenShift and containerized application environments.
Participate in code reviews, testing, deployment, CI/CD, and production support.
Collaborate with Agile teams, infrastructure, SRE, and business stakeholders.

Required Skills

5+ years of hands-on experience in Microsoft .NET technologies.
Strong expertise in C#, .NET, and .NET Core.
Experience with front-end, back-end, desktop, and Windows-based applications.
Strong knowledge of REST APIs, SOAP, HTTP services, and XML.
Experience with OAuth, Active Directory, application certificates, and authentication mechanisms.
Experience in application debugging, troubleshooting, root cause analysis, and legacy code refactoring.
Knowledge of CI/CD, source control, and deployment processes.
Exposure to OpenShift, Kubernetes, or containerized environments.
Strong communication, analytical, and problem-solving skills.

Nice to Have

Experience with Java, Spring Boot, and Spring MVC.
Knowledge of Maven/Gradle, JUnit, and Hibernate/JPA.
Experience with microservices and cloud platforms.
Banking or financial services industry experience.

Important Requirement

Candidates must be willing to work onsite in Montreal 4 days per week. This requirement is non-negotiable.

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More about this job

Responsibilities

Design, develop, maintain, and modernize enterprise applications using C# and .NET, and build integrations through REST APIs, SOAP services, HTTP services, and XML. Troubleshoot and secure applications, support Windows and containerized environments, and contribute to code reviews, testing, CI/CD, deployments, and production support.

Requirements

Candidates need at least five years of hands-on Microsoft .NET experience, strong C# and .NET Core expertise, and experience with application development, integrations, authentication, debugging, and legacy code. The role also calls for CI/CD and deployment knowledge, exposure to container platforms, strong communication and problem-solving skills, and willingness to work onsite in Montreal four days per week.

Skills

C#
.NET
.NET Core
REST APIs
SOAP
HTTP Services
XML
OAuth
Active Directory
Application Certificates
Application Troubleshooting
Root Cause Analysis
CI/CD
OpenShift
Kubernetes
Legacy Code Refactoring

Visa sponsorship

Not detected in the job text

Keywords

C#
.NET
.NET Core
Enterprise Applications
REST APIs
SOAP Web Services
HTTP Services
XML
OAuth
Active Directory
Application Certificates
Windows 10
Windows 11
Windows Server
OpenShift
Kubernetes
Containers
CI/CD
Source Control
Code Reviews
Agile
Application Security
Legacy Modernization
Java
Spring Boot
Spring MVC
Maven
Gradle
JUnit
Hibernate/JPA

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