Senior .NET Developer (C#, Java)

Alten; Montreal , Toronto; On-site; CAD 146,000 - 179,000; Full time

Job summary

ALTEN CANADA is seeking a Senior Backend Developer with strong Java and C#/.NET experience to support a large-scale security remediation and modernization initiative across legacy enterprise apps in a heavily regulated financial services environment.

The role focuses on upgrading legacy .NET 4.6 systems, modernizing dependencies, and ensuring secure, compliant migrations across 10–15 backend applications. You will collaborate across teams to deliver end-to-end solutions.

Qualifications

• Seven-plus years of hands-on software development experience delivering end-to-end solutions.
• Strong Java development experience (Java 1.7/1.8 or newer acceptable).
• Strong 7+ years of hands-on development in C# and .NET.

Responsibilities

• Implement changes across Java and C#/.NET components for the mobile work-intake process.
• Integrate mobile-channel requests with existing workflow applications and downstream systems.
• Maintain and enhance Crystal Reports components for customer-facing confirmations and PDFs.
• Modernize legacy Java, Tomcat, and .NET applications and dependencies.
• Perform hands-on end-to-end development, unit testing, troubleshooting, reviews, and documentation.

Skills

Java

C#/.NET

Crystal Reports

End-to-end development

Financial services experience

Tools

Oracle Database

Job description

In just three decades, ALTEN has become a global leader in Research & Development, Engineering, IT Services, Life Sciences, and Network Services. With a presence in more than 30 countries and a team of over 60,000 employees, we are trusted by industry leaders worldwide to deliver pioneering solutions and drive technical excellence.

ALTEN CANADA, a proud subsidiary of ALTEN headquartered in France, is dedicated to serving the Canadian market. With offices in Montreal and Toronto, we combine global expertise with local insight to accelerate innovation across Canada.

At ALTEN CANADA, our consultants thrive on solving complex, highly technical challenges across diverse industries. From Life Sciences to Energy, Automation to Manufacturing, Aviation, Defense. Automotive, Rail and Transportation to Information Systems and Telecommunications, our unwavering commitment to excellence shaping the future of technology and industry.

About the Opportunity

We are seeking a Senior Backend Developer (.NET / Java) to support a large-scale application security remediation and modernization initiative across a portfolio of legacy enterprise applications.

This role focuses on enhancing, securing, and modernizing approximately 10-15 backend applications currently running on legacy .NET 4.6 technologies. The successful candidate will play a key role in vulnerability remediation, framework upgrades, dependency modernization, and application migration activities within a highly regulated financial services environment.

This is an excellent opportunity for an experienced developer who enjoys solving complex technical challenges, modernizing legacy systems, and improving application security.

What You'll Do

• Implement application changes across Java and C#/.NET components supporting the mobile work-intake process
• Integrate requests submitted through the mobile channel with the existing workflow applications and downstream processing systems
• Maintain and enhance Crystal Reports components used to generate confirmations, statements, and PDF reports accessible to customers
• Contribute to the modernization of legacy Java, Tomcat, and .NET applications and dependencies
• Perform hands-on end-to-end development, unit testing, troubleshooting, code reviews, and technical documentation

Required Qualifications

• 7+ years of genuine hands-on software development experience, with the ability to deliver development work end to end
• Strong Java development experience; experience with Java 1.7/1.8 or more recent versions is acceptable
• Strong 7+ years of hands-on development expertise in C# and .NET
• Crystal Reports experience, including the .NET component
• Proven experience migrating or modernizing legacy applications, frameworks, or application-server environments
• Previous experience in financial services, asset management, investment management, banking, or a comparable regulated financial environment

Nice to Have

• Experience working on mobile application or digital application projects
• Experience with application security remediation and vulnerability mitigation
• Experience with Tomcat; versions 8, 9, 10, or 11 are relevant
• Tools / software / methodology / certification: Java, C#, .NET, Crystal Reports, Tomcat
• Soft skills: Team player, collaborative, adaptable, proactive, and comfortable working with evolving technical requirements

Technical Environment

Core Technologies

• C#
• Crystal Reports
• Java
• Oracle Database

ALTEN Canada fosters a dynamic, collaborative work environment where every team member is empowered to reach their full potential. We are deeply committed to investing in our people by offering meaningful experiences and supporting continuous learning, growth, and career development

At ALTEN Canada, your skills are celebrated, your ambitions supported, and your growth continuously nurtured. Join us and discover the difference of working with a company that values innovation, collaboration, and excellence, where endless possibilities await.

ALTEN CANADA is committed to promoting diversity, equity, and inclusion. We strive to provide a work environment where every individual feels welcomed, valued, and respected, allowing them to thrive to their full potential. This includes our dedication to offer accessibility measures to those who require them. Should you require any accommodation during our recruitment process, please reach out to us.

Alten uses artificial intelligence tools to support certain administrative aspects of the recruitment process, such as interview note-taking and résumé formatting. These tools do not make hiring decisions. Candidate consent is always obtained prior to use.

In accordance with our compensation practices, ALTEN is providing the salary range associated with this opportunity. Final compensation will be determined after considering several factors, including professional experience, skill set, educational background, certifications, and geographic market conditions. The current target salary range for this role is $115k/Annum or $85/HR

This job posting corresponds to an active and immediate vacancy currently open with one of Alten's clients.