Senior Full Stack Software Engineer

About Brim

Brim Financial is a category defining fintech, building the operating system for credit cards and payments. Our platform powers card programs for banks, credit unions, fintechs, and global brands across North America. We are backed by EDC Growth Equity, Epic Ventures, Vistara Growth, and Impression Ventures and have been recognized as a CB Insights Fintech 100 company and Deloitte Fast 50 and Deloitte Fast 500 winner.

We are looking for a Senior Engineer to lead the architecture and development of core platform systems. This is a high-ownership role - you'll design and scale the services that process credit card transactions, power real-time rewards at every merchant globally, and integrate with banking cores and payment networks. The systems you build will directly serve major financial institutions and their millions of end customers.

What You'll Do

• Lead the architecture, development, and optimization of services across the full stack using PHP and Python, with a focus on scalability, security, and long-term maintainability
• Design and implement RESTful APIs and microservices that integrate with banking cores, payment networks, and institutional partner systems
• Optimize MySQL performance through query tuning, schema design, and data modeling for high-throughput financial transaction systems
• Drive engineering standards for quality, testing practices, and CI/CD workflows across the team
• Provide leadership and influence the team's AI tooling strategy - evaluating, adopting, and establishing best practices for AI-assisted development across the engineering organization
• Champion security and compliance best practices appropriate for a regulated financial services platform
• Bring deep business understanding to technical decisions - the best solutions come from engineers who understand the full picture, from cardholder experience to settlement
• Mentor mid-level and junior engineers on system design, full-stack fundamentals, and professional growth

What You'll Bring

• 6+ years of professional development experience with deep expertise in application architecture and production systems at scale
• Strong command of MySQL including query optimization, schema design, and performance tuning
• Extensive experience with RESTful API design and microservices architecture
• A track record of making sound technical decisions under ambiguity - designing systems, evaluating tradeoffs, and leading through influence rather than authority
• Comfort working across the full stack - you're not boxed into backend or frontend, you go where the problem is
• Comfort with remote-first, sync and async collaboration and strong written communication skills
• Comfort with remote-first, sync and async daily collaboration with fluid times
• Ability to balance long-term architectural thinking with pragmatic delivery in a fast-moving environment

Bonus If You Have

• Experience in fintech, payments, credit card infrastructure, or regulated financial services
• Familiarity with multi-tenant platform architecture or real-time transaction processing
• Experience with AI-assisted development tools or integrating LLM APIs into production systems
• Background with PCI DSS, SOC 2, or financial compliance requirements

What We Offer

• Competitive compensation and equity
• Remote-first workplace
• Comprehensive health plan and PTO
• A team that treats AI as a force multiplier, not a threat
• Real ownership - you'll shape the systems and standards that define how we build
• Direct influence on the technical direction of a platform serving major financial institutions

Other Information

• Remote (US/Canada) | Full-Time
• Reason for vacancy: New vacancy
• Salary range: CAD $130,000-$160,000