Senior Staff Software Engineer

As a Senior Staff Software Engineer at NMI, you operate beyond the scope of a single team, providing technical leadership and driving meaningful impact across systems, teams, and partner experiences. You lead through deep technical expertise, strong collaboration, and a commitment to engineering excellence.

In this role, you will work across both the Partner Activation and Partner Administration teams, helping shape and deliver scalable, secure, and cohesive partner-facing platform capabilities. You will collaborate closely with Engineering Managers, Product Managers, Designers, and fellow Staff+ engineers to ensure our systems enable partners to integrate with NMI efficiently and confidently.

This role balances hands-on engineering with technical strategy, focusing on improving partner onboarding, integration experiences, and the long-term health of the partner platform.

Key Responsibilities

Technical Leadership & Architecture

• Provide technical leadership for the team, influencing architecture and design decisions that span multiple teams.
• Own and evolve critical platform areas including partner onboarding, developer tooling, authentication, user management, and the unified partner portal.
• Identify long-term technical risks and opportunities, and lead initiatives to address scalability, reliability, security, and maintainability.
• Set and reinforce engineering standards, patterns, and best practices across teams.

Cross-Team Collaboration & Influence

• Collaborate closely with Engineering Managers and Directors to align technical strategy with delivery plans and team goals.
• Partner with Product Managers, Directors, and Designers to translate product vision into technically sound, scalable solutions.
• Act as a trusted technical advisor across teams, helping resolve complex cross-team dependencies and tradeoffs.
• Drive alignment and consistency across partner-facing systems and experiences.

Hands-On Engineering & Delivery

• Design, implement, and review high-impact code, particularly in complex or high-risk areas.
• Lead technical discovery and execution for ambiguous or strategically important initiatives.
• Ensure solutions are well-tested, observable, and production-ready.
• Balance short-term delivery needs with long-term platform health.

Mentorship & Engineering Excellence

• Mentor senior and mid-level engineers, helping them grow in technical depth, system design, and scope of impact.
• Raise the quality bar through thoughtful code reviews, architectural guidance, and knowledge sharing.
• Foster a culture of continuous improvement, learning, and technical curiosity.

Platform Quality, Security & Reliability

• Champion secure-by-design principles, particularly around authentication, authorization, and partner data access.
• Work closely with SRE and platform teams to ensure systems meet reliability, availability, and performance expectations.
• Improve observability, operational readiness, and incident learnings across partner-facing systems.

Skills and Experience

• Bachelor’s degree in Computer Science, Information Technology, or equivalent practical experience.
• 8+ years of experience developing complex software applications in a commercial environment, with demonstrated impact at the Staff or Senior Staff engineer level.
• Advanced, hands-on experience building and maintaining large-scale systems using .NET Framework / C# (preferred) and/or PHP, with a strong understanding of object-oriented design principles and software architecture.
• Strong experience working with relational databases, particularly Microsoft SQL Server, including schema design, query optimization, performance tuning, and maintaining data integrity in production systems.
• Proven experience designing, coding, deploying, and operating cloud-based solutions hosted on AWS, with an understanding of scalability, fault tolerance, security, and cost-aware design.
• Experience designing and architecting scalable, distributed systems, with consideration for performance, reliability, and long-term maintainability.
• Deep understanding of the Software Development Life Cycle (SDLC) and agile development methodologies.
• Strong knowledge of security best practices, including secure coding principles and compliance requirements (e.g., OWASP Top Ten, PCI DSS, SOC 2, HIPAA, or similar).
• Solid understanding of networkin