Defense Software Engineer Jobs in Ontario (NOW HIRING)

Build bold. Deliver impact. Win together.
At General Dynamics Mission Systems–Canada, we’re not just engineering technology — we’re shaping the future of defence and security. Our teams design and deliver advanced, mission-critical solutions that enhance national security, strengthen communities, and protect the people we serve.
If you’re looking for meaningful work that contributes to a safer, more secure world, you’ll find purpose here. Every day, your skills will directly impact programs that matter.

General Dynamics Mission Systems-Canada is hiring for a current vacancy but also future Software Engineering openings for upcoming projects in our  Air & Naval (A&N) Sonar division. Join a team developing software solutions that support mission-critical functions.  These systems contribute directly to improving operational effectiveness, situational awareness, and decision-making capabilities for defense partners around the world.

Specific responsibilities will vary depending on the level of the position and project, but may include:

• Developing high-quality, maintainable code while adhering to project and coding standards
• Participating in code reviews and contributing to continuous improvement initiatives
• Troubleshooting and resolving software issues, including root cause analysis and verification of fixes
• Collaborating with cross-functional teams to support system design, integration, and validation
• Providing technical support to internal stakeholders throughout the development lifecycle
• Presenting technical content at design reviews and team meeting
• Performing software requirements analysis, design, development, testing, and integration
• Writing and reviewing software design documentation, test plans, and procedures

• Bachelor's degree in Engineering, Computer Science, or a related technical/scientific discipline
• 3+ years of relevant experience with software development
• Proficiency in one or more modern programming languages (e.g. C++, java)
• Experience with Agile software development, object-oriented design tools, and UML
• Familiarity with Linux as a host environment and software version control systems
• Strong communication, problem-solving, and analysis skills
• Ability to work effectively in a team environment and independently with minimal supervision
• Positive approach to learning, strong work ethic, and enthusiasm for taking ownership of work
• Experience working with or familiarity with AI/ML models is preferred.

It is a requirement that General Dynamics Mission Systems-Canada be registered with the Canadian Controlled Goods program and that all of its workforce be security assessed. Successful applicants must meet all applicable security requirements, including but not limited to the ability to obtain and maintain a Canadian government security clearance. Applicants may be required to meet additional security requirements in order to gain access to technical data, classified areas or information that is subject to international regulations. You must be eligible to work in Canada.

The hiring range for this position is $78,000-$115,000.Our goal is to provide a fair and competitive offer based on an assessment of internal equity and your qualifications, including:

• Relevant experience
• Technical and non-technical skills
• Education and certifications

Benefits
As a full-time employee at General Dynamics Mission Systems–Canada, you’ll enjoy a competitive total rewards package that supports your professional and personal well-being:

• Comprehensive medical, dental, and vision coverage for you and eligible dependents from day one (no cost), including flexible benefits options (HCSA) emergency travel insurance, and 24/7 virtual care services.
• Employee & Family Assistance Program (EFAP), onsite fitness facilities, and employee resource groups.
• Defined Contribution Pension Plan with employer contributions after 3 months, RRSP access from day one, and financial planning support.
• Flexible time off including vacation, holidays, parental leaves with top-up options, sick leave, and disability programs.
• Career development through learning platforms, educational assistance, mentoring, and reimbursement of professional memberships.
• Additional perks such as employee discounts, free onsite parking, social clubs, and an annual scholarship program for employees’ children.

Why join us?

• Purposeful Innovation: You’ll work on innovations that genuinely make a difference. You’ll apply advanced thinking, design expertise, and practical problem-solving to help equip military and allied forces with leading-edge systems. You’ll be surrounded by some of the brightest minds in the defence sector, contributing to next-generation technologies in an environment that celebrates creativity, new ideas, and modern solutions.
• Connection: We believe people do their best work when they feel they belong, and their ideas can flourish. Different perspectives, experiences, and ways of thinking help us innovate and grow. Strong relationships with our teammates help us unite, overcome challenges, and deliver the world-class quality we’re known for. Here, we are committed to inclusivity and ensures every individual feels valued, respected, and empowered.
• Challenging and Rewarding Career Pathways: Your career path matters to us. From mentorship and regular check-ins with your leader to educational support, professional certifications, and continuous training, you’ll have the resources you need to thrive. We encourage internal mobility so you can explore different business areas, broaden your skillset, and expand your network. You’ll be working on high-profile, impactful projects that challenge your skills, expand your expertise, and allow you to both learn from mentors and guide others along the way.

Accommodation 
If you require accommodation during any stage of the application process, please contact Human Resources via recruitment@gd-ms.ca.

Closing Date
We reserve the right to close this vacancy early if we receive sufficient applications for the role. Therefore, if you are interested, please submit your application as early as possible.