Senior Software Engineer Full-Stack - Security Platform

About the role

At Vannevar we’re building the next generation of mission software that powers decision-making across the national security defense and intelligence communities.

Protecting the sensitive data and workflows behind those missions is foundational to our platform.

The Security Platform team builds the authentication authorization and identity infrastructure that ensures the right people and services have access to the right resources—securely reliably and with minimal friction.

In this role you’ll join a small cross-functional team and own work across the stack—from frontend permission-management interfaces to backend services authorization engines and data models.

You’ll partner closely with product engineers designers compliance and application security teams forward deployed engineers and mission users to build security capabilities that are intuitive scalable and deeply integrated into the product experience.

This is a high-impact opportunity to shape how Vannevar approaches identity and permissions build reusable platform capabilities and enable new customer workflows across our products.

What you’ll do

• Build and scale Vannevar’s centralized authentication and authorization platform including tenant isolation across customer environments—from development through classified deployments.
• Own the internal self-service platform for user group and permission management; partner with Design to deliver intuitive administrative experiences for developers and mission teams.
• Build tooling and visualizations that help developers administrators and mission users understand and validate access permissions.
• Own and evolve Vannevar’s platform management interfaces including the feature flag system to support new products and customer needs.
• Partner with product engineering teams to build shared authorization and resource-sharing capabilities across the platform.
• Shape the long-term roadmap for the Security Platform team by driving scalable platform capabilities and improving the developer experience.

What we’re looking for

• 7+ years of software engineering experience with a strong track record of designing building and operating scalable backend systems and delivering full-stack features from conception through production.
• Strong backend expertise including proficiency in one or more modern backend languages (e.g.

  Python Java) experience with relational databases (e.g.

  PostgreSQL) distributed systems and API design.

• Comfortable owning end-to-end development including frontend work (e.g.

  React/TypeScript/Node.js) when needed with a focus on delivering polished customer-facing experiences rather than specializing exclusively in backend infrastructure.

• Strong product intuition with the ability to make pragmatic technical decisions balance user needs with engineering tradeoffs and thrive in ambiguous fast-moving environments.
• Experience with identity and authentication concepts and platforms including OAuth 2.0 OpenID Connect (OIDC) SAML JWTs session management RBAC/ABAC SSO Keycloak OpenFGA or other authentication and authorization systems.
• Excellent cross-functional collaboration and communication skills with experience partnering closely with product design security and infrastructure teams driving technical direction and aligning stakeholders through ambiguity.
• Nice to have 
  • Active Security clearance or ability to obtain one and desire to travel to visit users collect feedback and debug issues
  • Prior experience working in a user-facing product role

What we offer

The salary range for this position is $150 000 - $215 000 + equity.

Within the range individual pay is determined by experience relevant education and/or training.

• Health dental and vision insurance
• Remote friendly with WeWork access
• Unlimited PTO shared downtime during the federal holiday calendar and company-wide off time at the end of each year
• 401(k) match
• Lifestyle & wellbeing stipends
• Salary top-up during military reserve duty
• Fully paid parental leave
• Child and pet care reimbursement during travel