Role Description As Marqeta’s Principal Software Engineer on the Core Issuing & Processing team, you will work across the entire domain to stand up and drive high-impact projects for our customers from inception to completion. You will take on highly technical initiatives that optimize our issuing and processing engines, own the technical roadmap for the core platform, and partner with engineering leaders to drive engineering and operational excellence throughout the organization. The Core Issuing and Processing team owns the foundational stack that powers Marqeta's core business. We develop and maintain the systems that span six critical domains: - Onboarding - Issuing - Digital Wallets - Authorization & Clearing - Transaction Controls - Ledger Together, these systems form the backbone of Marqeta's card issuing and payment processing platform. Qualifications - 12+ years of hands-on software engineering experience. - Demonstrated passion for software engineering excellence, including design principles, fault tolerance practices, scalability, cost, security & privacy considerations, and test-driven development. - Experience partnering with product teams to ideate and bring innovative solutions to market. - Experience developing and scaling microservices using modern cloud technologies, preferably AWS. - Experience working with high volume / low latency data infrastructures. - Solid understanding of security engineering best practices and demonstrable experience in designing solutions that adhere to those standards. - Passion for non-functional challenges, namely: Scale, Cost, Reliability, Performance, High Availability. - Experience building systems running in multiple regions. - Team-oriented approach – can effectively lead a project, participate as an influential team member, and work cross-functionally with other organizations. - Experience with our tech stack, namely Java, Springboot, Kubernetes, Terraform, Helm, Kafka, JPOS, and AWS services. Requirements - Own the technical roadmap and author system designs that enable scalable, secure, and operationally efficient card issuing and payment processing products for our customers. - Spend significant time in the codebase – writing, reviewing, and optimizing code across the issuing and processing stack. - Identify and drive high-impact technical initiatives that improve the performance, reliability, and cost-efficiency of our core processing engines. - Collaborate with Product Managers to analyze requirements and provide technical recommendations across onboarding, issuing, digital wallets, authorization & clearing, transaction controls, and ledger. - Mentor and guide technical leads, influence stakeholders, and establish success metrics to drive organization-wide technical excellence. - Apply and evangelize modern best practices in your software designs and implementations to increase the platform's resiliency and scalability. Benefits - Multiple health insurance options - Flexible time off – take what you need - Retirement savings program with company contribution and after tax contributions - Equity in a publicly-traded company and an Employee Stock Purchase Program - Family-forming benefits, fertility support, and up to 20 weeks of Parental Leave - Free therapy sessions, financial and professional coaching, and legal advice - Monthly stipend to support our remote work model - Annual “development dollars” to support our people growth and development - Through Flex First, the freedom to live and work wherever you and your family thrive

• Design, develop and evolve APIs and integrations using the MuleSoft Anypoint Platform. • Implement integration flows between Salesforce and corporate systems, ensuring scalability, security and high availability. • Develop connectors and components for integration with legacy systems, ERPs, customer service platforms and other business applications. • Work on API governance and lifecycle management using features of the Anypoint Platform. • Ensure data consistency and synchronization between Salesforce and corporate systems. • Implement observability strategies, error handling, resilience and monitoring for integrations. • Participate in architectural decisions, supporting technical choices and promoting integration best practices and reuse of assets.

• Design and develop mobile applications (SuperApp) using AI agents, ensuring senior-level execution of the deliverables under your responsibility. • Modernize Android, iOS, and Java backend platforms, preserving current functionality while reorganizing customer journeys.

• Architect and build applications and SDKs for the iOS platform • Manage releases and SDK versioning • Maintain a public facing API documentation for working with our SDKs • Ideate and propose platform specific improvements for our SDKs • Maintain code quality and high standards of development • Unit-test code for robustness, including edge cases, usability, and general reliability • Build and maintain CI/CD infrastructure along with internal tooling and reporting infrastructure • Work with product team to translate business requirements into smaller work units for the engineering team • Collaborate with other engineers to plan, build and test new features • Understand existing tech debt, and work with team leads on proposals to manage tech debt • Participate in technology roadmap discussions