• Actively participate across the entire solution conception and development lifecycle, from the Discovery process—helping to identify the right problem to solve • Contribute to technical refinements to structure solution designs • Interact with interdependent squads to ensure alignment and integration of solutions • Develop frontend (React) and backend (.NET Core) layers as required, including unit tests to ensure quality and security • Ensure proper configurations for DevOps processes, and plan and monitor production deployments • Monitor the post-release environment to ensure stability and performance • Apply advanced AI techniques, using tools such as Python (LangChain, Langgraph), RAG, prompt engineering and agent evaluation (EVALs) • Work with AWS infrastructure (DocumentDB, Lambda, ECS, S3, Redis) and CI/CD tools (GitHub Actions, Terraform, Docker) • Collaborate on the development and integration of intelligent agents; knowledge of MCP and Go is a plus

Role Description We’re looking for an experienced Senior Backend Engineer to design, build, and ship product features end to end across Air’s web platform. - You’ll own every step of the development lifecycle—requirements gathering, architecture, implementation, testing, release, and iteration—while collaborating closely with Product, Design, and fellow engineers. - Collaborate with Product and Design to break down ambiguous problems into clear requirements and thoughtful technical decisions. - Own the entire development cycle, from ideation to deployment - across our React/Node stack. - Participate in on-call rotations, tech-spec reviews, and code reviews. - Continuously improve engineering practices, suggesting and delivering enhancements across both frontend and backend codebases. - Help grow the team by interviewing and mentoring engineers. - Drive projects forward in a high-velocity, resource-constrained environment where requirements may be lightly defined. - Proactively create clarity, seek support from stakeholders, and occasionally wear a product hat to keep initiatives moving. - Work fluidly across frontend and backend technologies, including React, TypeScript, Next.js, Node.js, Vercel, and modern tooling. - Design APIs, architect data models, and implement UI components that scale. - Offer thoughtful feedback on technical designs and code reviews. - Advocate for high-quality technical decisions and best practices, helping to set the standard for Air’s engineering culture. Benefits - Air contributes 90% to medical, dental, and vision insurance and 75% to dependent coverage. - Employees also have life insurance, disability insurance, and membership to One Medical. - 401k program. - Commuter benefits. - Generous work from home stipend. - Professional development reimbursement. - Unlimited vacation days.

• Design and implement back end application components, such as FHIR operations, primarily using Java and related technologies. • Develop and maintain core product code, with a focus on quality, performance, and maintainability. • Participate in code reviews, adhere to team coding standards, and contribute to improving development practices. • Analyze requirements and propose technical solutions at various stages of development. • Build and iterate on proof-of-concept integrations. • Troubleshoot and resolve issues reported by customers or identified during testing. • Research relevant technologies and contribute findings to the team. • Create and maintain technical documentation.

• Be part of a 24x7 on-call rotation supporting all services the Database Engineering teams owns. • Contribute to the technical vision for database engineering in maintenance and Cloud migration of the relational and non-relational databases used at Marqeta. • Contribute to the design of high availability and disaster recovery solutions for database architecture. • Work on initiatives including but not limited to platform architecture, database partitioning, sharding, and the continuous evolution of the database footprint to support business growth. • Keep automation as the primary focus and ensure the design is tightly coupled with various automation to reduce manual work. • Work with the engineers from various teams to execute on short- and long-term technical vision. • Work on the root cause analysis, remediation and document efforts to effectively minimize incidents. • Write clear design documents and articulate technical decisions and trade-offs to peers and stakeholders. • Contribute to monitoring and alerting practices using tools like Datadog. • Mentoring junior engineers and contributing to team standards.