Senior Software Engineer
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Job Description
Senior Software Engineer building scalable billing and invoicing systems for NMI, a global payment technology platform. Using C#, PHP, Claude, and Cursor to support high-volume merchant transactions.
Responsibilities:
- Design, develop, and maintain core billing and invoicing systems using C# and PHP
- 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
- 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 AI tool usage
- 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 software-development-lifecycle risks
- Provide feedback and resolutions to escalated support issues
- Research and evaluate technologies and methodologies to improve performance and developer productivity
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
- 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, including OWASP and PCI
- Excellent communication skills and proven ability to mentor others and work across teams
- Experience designing and architecting scalable, distributed systems
- 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
- Sound judgment about appropriate use and limitations of AI tooling
- All offers subject to satisfactory background and financial checks
- Must have the legal right to be employed in the United States
Benefits:
- A remote first culture!
- Competitive compensation and benefits
- Personal growth and advancement opportunities
- Flex PTO & dedicated sick time
- Health, Dental and Vision Insurance
- Life, ADD, Short-term and Long-term Disability insurance
- 401k matching up to 4% after two months of service
- Flexible Spending Account
- Paid Parental Leave
- Company volunteer days
- Employee referral program
- Bonusly colleague recognition
- Diversity, Equity & Inclusion initiatives, affinity groups, open forums, and inclusion and belonging surveys
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