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Staff Software Engineer

NMI is a payments platform that enables partners, SMBs, and fintechs to integrate modern payment capabilities. The company is seeking a Staff Software Engineer to work across Partner Activation and Partner Administration, delivering secure, scalable partner-facing systems and improving onboarding, administration, and long-term platform health through hands-on engineering and cross-team collaboration.

Skills

  • Strong hands-on experience with .NET / C# (preferred) and/or PHP for backend services and APIs.
  • Experience with Microsoft SQL Server or other relational databases, including schema design and performance tuning.
  • Experience designing, deploying, and operating cloud-based solutions on AWS.
  • Experience with distributed systems, focusing on performance, reliability, and maintainability.
  • Knowledge of SDLC and agile development practices.
  • Familiarity with secure coding and compliance-aware development (OWASP, PCI, SOC 2, HIPAA).
  • Understanding of networking fundamentals (HTTPS, DNS, SSL/TLS).
  • Experience improving testing, observability, and production support.
  • Strong debugging, problem-solving, and communication skills.

Responsibilities

  • Contribute to technical design and implementation of partner-facing systems across Partner Activation and Partner Administration.
  • Design and build scalable, secure, and maintainable backend services and APIs using established architectural patterns.
  • Collaborate with engineering managers, product managers, designers, and engineers to translate product requirements into technical solutions.
  • Write, review, and maintain high-quality code with emphasis on reliability and long-term maintainability.
  • Identify technical risks and opportunities for improvement and raise them proactively.
  • Improve testing, observability, and operational readiness for production systems.
  • Mentor junior and mid-level engineers through code reviews, pairing, and technical guidance.

Education

  • Bachelor’s degree in Computer Science, Information Technology, or equivalent practical experience.
  • Or equivalent professional experience in software engineering for commercial environments.

Benefits

  • Annual salary range $120,000 - $140,000 plus bonus
  • Remote-first culture
  • Flexible PTO
  • Health, dental, and vision insurance
  • 13 paid holidays
  • Company volunteer days
  • Diversity, Equity & Inclusion initiatives and employee affinity groups
To read the complete job description, please click on the ‘Apply’ button
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Our mission is to use our expertise to enable more payments, in more ways and more places. We provide ISOs, Fintech Innovators and Technologists the freedom to focus on what they do best, liberating them from restricted payment solutions and givin...

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SENIORITY LEVEL REQUIREMENT
TEAM SIZE
SALARY RANGE
$120,000/yr - $140,000/yr
EMPLOYMENT TYPE
Full-time, remote
DATE POSTED
December 13, 2025
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