Staff Engineer/Tech Lead (FinTech)

We’re looking for a Staff Software Engineer to serve as the lead engineer for our Extensions team. In this role, you’ll balance hands-on coding with technical leadership, shaping the architecture and direction of systems built in C# and PHP. You’ll be responsible for ensuring our applications are scalable, reliable, and observable in production, while also improving the developer experience so the team can deliver effectively. As the team’s technical lead, you’ll mentor engineers, guide design decisions, and influence practices across the organization, helping us deliver high-quality software that supports the business long-term.

Key responsibilities: 

• Write, review, and maintain high-quality, production-grade code in C# and PHP.
• Set the bar for code quality through design reviews, mentoring, and hands-on contributions.
• Define and evolve the architecture of our services and applications to ensure scalability, maintainability, and performance while allowing us to deliver at speed.
• Introduce new tools, frameworks, and practices that improve developer experience, boost productivity, and make success a default outcome.
• Advocate for “you build it, you run it” culture — ensuring the team owns the end-to-end lifecycle of their software.
• Mentor and coach engineers, helping them grow technically and professionally.
• Guide planning and estimation by breaking down complex technical work, identifying risks, and aligning scope with delivery goals.
• Communicate complex technical concepts to varied stakeholders, enabling informed decision-making.
• Shape long-term technical strategy in partnership with product and engineering leadership.
• Identify risks and opportunities in the team’s technical direction and proactively recommend solutions.
• Influence broader engineering practices across the organization, amplifying impact beyond your immediate group.

Skills and experience: 

• Extensive professional experience building and supporting production systems in C# and/or PHP, including modern frameworks and libraries.
• Proven experience as a technical leader, setting direction, making architectural decisions, and guiding a team toward long-term goals.
• Demonstrated ability to mentor, coach, and elevate other engineers, raising the overall effectiveness of the team.
• Proficiency with databases (e.g., SQL Server, MySQL), including schema design, optimization, and query tuning.
• Strong knowledge of CI/CD pipelines, automated testing, and modern DevOps practices.
• Strong knowledge of caching strategies and technologies (e.g., Redis, Memcached) for improving performance and scalability.
• Experience with messaging and queuing systems (e.g., RabbitMQ, Kafka, SQS) to build resilient, decoupled, and scalable architectures.
• Hands-on experience with containerization/orchestration (Docker, Kubernetes).
• Track record of ensuring production systems are reliable and observable, with practical expertise in instrumentation and monitoring practices (Datadog, New Relic).
• Track record of establishing and enforcing engineering best practices (testing, code reviews, observability, alerting, security).
• Demonstrated ability to balance hands-on coding with high-level technical leadership, acting as both an architect and an implementer.
• Strong collaboration and communication skills, with experience working across product, QA, operations, and business stakeholders.
• Bachelor’s degree in Computer Science or related field, or equivalent practical experience

As well as being a part of something exciting everyday, you will also receive the following benefits:

• • Annual salary + bonus
  • A remote first culture!
  • Flex PTO 
  • Health, Dental and Vision Insurance
  • 13 Paid Holidays
  • Company volunteer days

What we do!

NMI enables our partners with choice, and challenges the one-size-fits-all approach to payments. You've probably used NMI in the last 24 hours without even realizing it. We’re the platform that powers success for innovative tech created by SMBs, entrepreneurs and fintech startups. We’re creative problem solvers who help visionaries smash through boundaries and think beyond what’s possible so they can think about what’s next. But we’re not just built for the tech savvy. We democratize the latest payments technology so that everyone can realize the benefits of easy payments across the full spectrum of commerce. We’re all about enabling more payments in more ways and more places.

We believe that having a diverse group of employees strengthens both our work and our workplace. We’re focused on making NMI more diverse and welcoming with ini