Software Engineer - Platform Foundation

Blend is a financial technology company that provides a cloud banking platform to financial services firms to deliver digital financial experiences. The Senior Software Engineer will build and evolve foundational backend systems, including identity, access control, APIs, asynchronous workflows, shared services, and secure AI-assisted automation. The role also involves leading technical design, improving reliability and security, partnering across teams, mentoring engineers, and driving platform architecture.

Responsibilities:

• Design, build, and operate reliable backend services and shared platform capabilities
• Lead technical design for APIs, distributed systems, data storage, workflow orchestration, and service integrations
• Build secure authentication and authorization systems for users, partners, services, and API clients
• Develop and maintain login flows including SSO, OAuth/OIDC, MFA, session management, token lifecycle, and role- or scope-based access control
• Improve platform security through strong access controls, auditability, secrets management, tenant isolation, and secure service-to-service communication
• Build background-agent systems that automate support and operational workflows while maintaining clear safety controls and human oversight
• Develop integrations with collaboration, ticketing, source-control, and internal operational tools
• Create safe AI-agent execution patterns, including isolated runtimes, scoped permissions, tool allowlists, approval workflows, and output-safety checks
• Improve reliability and operability through monitoring, tracing, incident response, testing, and performance engineering
• Partner with product, security, infrastructure, and support teams to turn complex requirements into scalable platform capabilities
• Mentor engineers, contribute to technical standards, and lead design discussions across teams
• Lead complex projects, make strong architectural decisions, and improve the systems around them
• Set technical direction for broader areas, align teams around platform investments, and create leverage through mentorship, standards, and architecture

Requirements:

• 6+ years of professional software engineering experience
• Strong backend engineering experience in Go, TypeScript/Node.js, Java, Python, or a similar language
• Experience designing and operating production distributed systems, APIs, databases, and asynchronous workflows
• Strong understanding of authentication, authorization, sessions, tokens, identity protocols, and secure API design
• Experience building secure, reliable systems that handle sensitive data and enforce access controls
• Familiarity with cloud infrastructure, containers, Kubernetes, CI/CD, and production observability
• Strong system-design skills and the ability to make sound technical tradeoffs
• Clear written and verbal communication skills, including the ability to influence across teams
• A practical ownership mindset: comfortable debugging production issues and improving systems end to end
• Experience with AI agents, LLM tool use, automation platforms, or human-in-the-loop systems
• Experience designing secure agent runtimes, sandboxing, permission models, or safety controls
• Experience with enterprise identity integrations and SSO
• Experience with workflow engines, event-driven architectures, or platform engineering
• Experience in fintech, security, healthcare, or another regulated industry
• Experience mentoring engineers or leading cross-team technical initiatives