NMI is looking for a passionate Senior Software Engineer to join our Development team as a result of NMI's continued growth and investment in the underlying systems. As a senior developer with strong experience in C# and/or PHP, you will join a team of industry-leading experts that are talented, ambitious and want to drive the continued development of our payment processing services. Our developers are responsible for software services and deliverables that support the processing of billions of transactions for hundreds of thousands of merchants every year. These applications have to be efficient, reliable, redundant, secure, highly-available and scalable. A background in the development of accounting or billing systems is preferred for this specific role.

AI-assisted development is core to how we build at NMI. Our engineers work with Claude and Cursor every day, and we expect you to use them fluently: to move faster, to raise quality, and to spend more of your time on the problems that need human judgement.

NMI, a global leader in payment technologies, allows software and sales professionals to deliver payment innovations to their clients without having to build payment expertise in house. We're the platform that powers success for innovative tech created by SMBs, entrepreneurs and fintech startups. We're creative problem solvers who help visionaries smash through boundaries and think beyond what's possible so they can think about what's next. But we're not just built for the tech savvy. We democratize the latest payments technology so that everyone can realize the benefits of easy payments across the full spectrum of commerce. We take the time to understand each other and our customers. And we serve with care, because customers are never a transaction, and always our focus

Once we decide, we move forward together - holding ourselves accountable to our commitments, and focusing on what matters most to our customers. Raise the Bar. When we raise the bar, our customers feel it too.

Design, develop, and maintain core billing and invoicing systems using C# and PHP technologies.

Use AI-assisted development tools, specifically Claude and Cursor, as a core part of your daily engineering workflow across design, implementation, testing, refactoring, and comprehension of large existing codebases.

Remain fully accountable for everything you ship:



review AI-generated code with the same rigor you apply to any other contribution, verifying correctness, security, performance, and maintainability before it reaches production.

Take ownership of architectural and design decisions for billing system components.

Lead technical discussions, participate in code reviews, and drive best practices in maintainability and performance.

Mentor and support the growth of junior team members, including coaching on effective and secure use of AI development tools.

Lead improvements to CI/CD pipelines and development processes.

Implement monitoring, logging, and alerting systems to proactively identify and resolve issues.

Optimize database queries and system architecture to handle growing merchant and transaction volumes.

Implement robust security measures to protect sensitive payment and merchant data and ensure compliance with PCI DSS standards, including when working with AI development tools.

Communicate project status, risks, and technical decisions effectively to both technical and non-technical stakeholders.

Identify, assess, and mitigate risks, including security risks, throughout the software development lifecycle.

Research and evaluate new technologies and methodologies to improve system performance and developer productivity.

Bachelor's degree in Computer Science or equivalent experience.

Minimum of 5 years of experience developing complex software applications in a collaborative, agile environment.

Advanced proficiency in C# and/or PHP, with a strong understanding of object-oriented design principles and design patterns.

Advanced experience with database design, optimization, and performance tuning.

Excellent communication skills, with a proven ability to mentor others, contribute to a strong team culture, and work with others across teams to move projects forward.

Experience designing and architecting scalable, distributed systems with consideration for performance, reliability,



and maintainability.

Ability to translate complex business requirements into technical solutions.

Proven track record of code reviews and maintaining code quality standards.

Hands-on experience building production software with Claude and Cursor, our standard toolset, and a willingness to make them a daily part of how you work.

Sound judgment about where AI tooling adds leverage and where it does not, including an understanding of how these tools fail in large, legacy or sparsely documented systems.

Experience with monitoring and alerting systems (e.g. Experience with CI/CD pipelines, automated testing, and deployment processes.

Health and Dental Insurance

- Life, ADD, Short-term and Long-term Disability insurance
- Extended Health Care/Emergency Travel Assistance
- Employee Assistance Program
- Work Remotely
- Vacation, Personal Wellness and Sick time
- 10 Paid Holidays
- We're focused on making NMI more diverse and welcoming with initiatives such as having a dedicated Diversity, Equity & Inclusion action group, diversity goals for hiring, anonymized resume screening, affinity groups such as our Women's network and LGBTQ+ Network, open forums for discussions on diversity and social justice, and measuring inclusion and belonging as part of our regular employee engagement surveys.

NMI is committed to providing equal employment opportunity for all persons regardless of race, color, religion, sex, age, marital status, national origin, sexual orientation or sexual identity, genetic information, citizen status (except those that do not have the legal right to be employed in the United States), disability, military service, service member, veteran status, or any other basis protected by applicable law.

Please note that in compliance with the data protection regulations within your jurisdiction, any personal information submitted with your job application may be collected and used by NMI for the purpose of recruitment and employment-related activities. By submitting your application, you acknowledge and provide explicit consent to the processing of your personal information as described in our privacy policy found on our website. For more information on how we process your information, please read our privacy policy here:

100,000 - $120,000 CAD

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📌 Senior Software Development Engineer - Remote (Toronto)
🏢 NMI
📍 Toronto