Senior Software Engineer
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Job Description
Senior Software Engineer building scalable C# and PHP billing systems for NMI, a global payment technology platform. Improving secure payment processing, AI-assisted development, and engineering reliability.
Responsibilities:
- Design, develop, and maintain core billing and invoicing systems using C# and PHP technologies
- Use Claude and Cursor across design, implementation, testing, refactoring, and comprehension of large existing codebases
- Review AI-generated code for correctness, security, performance, and maintainability before production
- Own architectural and design decisions for billing system components
- Lead technical discussions, participate in code reviews, and drive maintainability and performance best practices
- Mentor junior team members, including coaching on effective and safe use of AI development tools
- Lead improvements to CI/CD pipelines and development processes
- Implement monitoring, logging, and alerting systems
- Optimize database queries and system architecture for growing merchant and transaction volumes
- Implement security measures for sensitive payment and merchant data and ensure PCI DSS compliance
- Communicate project status, risks, and technical decisions to technical and non-technical stakeholders
- Collaborate with Product Owners, Developers, and QA teams on product releases
- Identify, assess, and mitigate risks throughout the software development lifecycle
- Provide feedback and resolutions to escalated support issues
- Research and evaluate technologies and methodologies to improve performance and developer productivity
- Report to the Engineering Manager
Requirements:
- 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
- Strong knowledge of security and compliance best practices (e.g. OWASP, PCI)
- 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
- Proven ability to understand, debug, and enhance complex existing systems with limited documentation and evolving requirements
- 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
- Satisfactory background and financial checks required for employment offers
Benefits:
- Competitive compensation package
- 40 hours week with flexi-time
- 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
- Bonusly colleague reward scheme
- Employee referral scheme with generous financial reward
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