Senior Software Engineer - Money Movement

NMI

2h•$90,000 - $130,000•Remote

About The Position

As a Senior Software Engineer on the Money Movement - Innovation team, you'll build the systems behind NMI's bank-to-bank payments: public APIs, internal tools, and third-party integrations, using Scala, TypeScript, and C#, with TDD and containerized microservices on AWS (Docker, Lambda, ECS). You'll work AI-first, using tools like Claude Code daily and helping the team sharpen how it uses them. We're looking for someone who digs into ambiguous, high-stakes problems and owns them end to end. About the team: The Innovation team sits at the center of NMI's money movement strategy. Formed through NMI's acquisition of Dwolla, we build and evolve the bank payment platform NMI's partners rely on, spanning open banking, push-to-card, account verification, and new payment rail integrations. We work asynchronously, communicate often, and expect blockers to be surfaced early. Psychological safety and continuous improvement are how we keep our high pace sustainable.

Requirements

Strong grasp of programming languages, techniques, security, and architecture
Ability to take ownership of assigned work and complete it without close oversight
Experience with AI-first coding tools (e.g., Claude Code, Codex, Copilot)
Experience mentoring and participating in code reviews
4+ years developing applications with object-oriented or functional languages
Bachelor's degree in Computer Science (or related field), or 4+ years of additional equivalent experience

Nice To Haves

Working knowledge of distributed system design: event-driven microservices, containerized apps, service discovery
Experience with Agile practices
Experience with TDD and Continuous Integration
Experience with paired programming or mobbing
Experience with Scala, cats, or other functional programming tools and libraries
Experience building and sharing AI skills or similar
Exposure to ACH, payments, or other reliable/secure systems is a plus

Responsibilities

Design and develop applications in Scala, TypeScript, and C#
Use AI-first tools like Claude Code to research approaches, generate code, and strengthen review and testing
Own code quality and production issues: reviews, bug reports, and troubleshooting
Translate business needs into technical solutions with stakeholders and your team
Participate in agile ceremonies (refinement, planning, standups, retros) and help improve how the team works
Apply system design expertise across messaging (RabbitMQ), data at scale (SQL, S3), database/caching (RDS, Redis, DynamoDB), and CI/CD (Git, Jenkins, CloudFormation, Terraform)
Design, build, and enhance features within FeeNavigator using PHP/Laravel and Vue
Develop efficient database queries and optimize MySQL performance as needed
Own the quality of your work end-to-end through developer-led testing — writing unit, integration, and end-to-end tests, and validating your own changes through to production
Improve the health of a large, established codebase by refactoring complex areas and decomposing high-complexity components into maintainable, well-structured code
Document critical business logic, application workflows, and key architectural decisions
Collaborate with Product Managers to refine requirements and contribute to technical solution design
Participate in code reviews to maintain high engineering standards and share best practices
Work with SRE to ensure software is observable, resilient, secure, and production-ready
Diagnose and resolve incidents, defects, and performance bottlenecks in collaboration with cross-functional teams
Contribute to continuous improvement of development processes, tooling, and engineering practices