PHP Software Engineer

Senior Software Engineer (C# / PHP) – Remote First NMI is seeking a passionate Senior Software Engineer to join our Development team, supporting NMI's continued growth and investment in core systems. This role is crucial for driving the development of our high-volume payment processing services. As a senior developer with deep experience in C# and/or PHP , you will join a team of industry-leading experts. Our applications process billions of transactions annually for hundreds of thousands of merchants, requiring them to be efficient, reliable, redundant, secure, highly-available, and scalable. Experience developing accounting or billing systems is preferred for this specific position. Key Responsibilities Design, develop, and maintain core billing and invoicing systems utilizing C# and PHP technologies. 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. Actively mentor and support the growth of junior team members. 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 . Communicate project status, risks, and technical decisions effectively to both technical and non-technical stakeholders. Collaborate closely with Product Owners, Developers, and QA teams to ensure successful product releases. Proactively identify, assess, and mitigate risks, including security risks, throughout the software development lifecycle. Provide feedback and resolutions to escalated support issues. Research and evaluate new technologies and methodologies to improve system performance and developer productivity. Skills and Experience 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). Experience designing and architecting scalable, distributed systems, focusing on 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. Excellent communication skills, proven ability to mentor others, contribute to a strong team culture, and collaborate across teams. Preferred Experience Experience with logging systems (such as Logz.io) and optimizing logs. Experience with containerization (e.g., Kubernetes , Docker , etc.). Experience with monitoring and alerting systems (e.g., DataDog, NewRelic, etc.). Experience with CI/CD pipelines, automated testing, and deployment processes. NMI Overview NMI challenges the one-size-fits-all approach to payments, enabling choice for our partners. We are the platform powering success for innovative tech created by SMBs, entrepreneurs, and fintech startups, democratizing the latest payments technology across the full spectrum of commerce. Benefits Competitive annual salary + bonus. A remote first culture . Health and Dental Coverage. Company paid Life and Disability insurance. 11 paid holidays.')