Senior Platform Engineer — Backend, Security & AI

Blend; North Carolina; On-site; USD 124,000 - 146,000; Full time

Benefits offered by this job

Equity RSUs

Base salary and bonus eligibility

Comprehensive benefits

Flexible PTO

Job summary

Blend is hiring a Senior Software Engineer to design and evolve the backend platform that powers our cloud banking platform used by major financial brands. You will focus on authentication, APIs, and secure AI-assisted automation across high-impact systems used throughout the organization.

You will mentor engineers, shape technical standards, and lead architectural decisions while partnering with product and security teams to deliver scalable platform capabilities.

Qualifications

• 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.

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.

Skills

Go

TypeScript/Node.js

Distributed systems

Authentication

Cloud infrastructure

CI/CD

Observability

AI agents

Tools

Docker

Kubernetes

PostgreSQL

MongoDB

Job description

Blend is hiring a Senior Software Engineer to design and evolve the backend platform that powers our cloud banking platform used by major financial brands. You will focus on authentication, APIs, and secure AI-assisted automation across high-impact systems used throughout the organization.

You will mentor engineers, shape technical standards, and lead architectural decisions while partnering with product and security teams to deliver scalable platform capabilities.