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# Software Engineer, Applications

- **Company:** Authority LLC
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Salary:** $119,000.0 - $165,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), JavaScript (Programming Language), Amazon Web Services, Data Analysis, Software as a Service, Code Generation, Code Review, Cursor, Software Debugging, Django Web Framework, Python (Programming Language), PostgreSQL, Node.Js, OAuth, Open Source Technology, OpenID, RabbitMQ, Redis, Azure Active Directory, Ruby, Software Engineering, Policy as Code, Okta, ReactJS, Large Language Models, Claude Code, Multi-Agent Systems, Spring-boot, AI Coding Agents, Backend, Agentic-AI, Kubernetes, Docker, Agent2Agent Protocol
- **Published:** October 16, 2026
- **Apply:** https://www.builtincolorado.com/auth/login?destination=/job/sr-software-engineer-applications/11702488

## About the Role

* 5+ years of professional software engineering experience.
 * Deep, hands-on knowledge of OAuth 2.0 and OpenID.
 * Experience with ReBAC systems (OpenFGA, Zanzibar, SpiceDB): modeling schemas, writing and testing tuple-based policies, and reasoning about permission evaluation performance.
 * Experience with Auth0 or a comparable identity provider (Okta, Azure AD, Keycloak).
 * Strong backend skills in Java, Ruby, or Python, with frameworks such as Spring Boot, Rails, or Django.
 * Regular use of AI coding tools (Claude Code, Cursor, Codex) for code generation, debugging, and exploring unfamiliar code, and the judgment to own and vet what they produce.
 * A collaborative approach to design and decision-making, and a commitment to building an inclusive team.

BONUS POINTS

 * Experience building or scaling auth systems for a platform with complex organizational hierarchies (agencies, multi-tenant SaaS, etc.).
 * Familiarity with policy-as-code or attribute-based access control (ABAC).
 * Background in ad tech or programmatic advertising.
 * Contributions to open-source identity or authorization projects.

OUR TECH STACK

 * Languages: Ruby, JavaScript, Java
 * Auth & Identity: Auth0, OpenFGA
 * Infrastructure: AWS, Docker, Kubernetes
 * Data: PostgreSQL, Redis
 * Frameworks & Tools: Spring Boot, Rails, Node.js, React, RabbitMQ, Sidekiq

## Description

Build and maintain authentication and fine-grained authorization systems using Auth0 and OpenFGA. Own OAuth 2.0 and OpenID Connect implementations, identity federation, token flows, and permissions for AI agents. Lead cross-team technical projects, set engineering standards, review code, and mentor engineers. The role requires strong backend development skills and experience with identity providers, ReBAC systems, and complex multi-tenant authorization models.
The summary above was generated by AI
WHO WE ARE
At Basis, we empower agencies and brands with cutting-edge software that automates digital media operations. Our all-in-one platform supports seamless planning, reporting, and financial reconciliation across direct, programmatic, search, and social media.
We're not just building advanced technology; we're also building a culture where passionate, motivated individuals come together to drive meaningful change. Our commitment to inclusivity and growth ensures our employees thrive both professionally and personally.
With our headquarters in Chicago, we offer flexible work options across the U.S. and Canada, including remote, hybrid, or on-site at headquarters.

ABOUT THE TEAM

The Auth team owns the systems that decide who can do what across Basis: authentication, identity, and fine-grained authorization for a platform built on complex agency and org hierarchies. We're an enabling team: every product team at Basis depends on the primitives, policies, and infrastructure we build and own. That now includes authorization for AI agents operating alongside human users, not just human users alone.

WHAT YOU'LL DO

 * Extend our identity layer in Auth0: authentication flows, token issuance, identity federation.
 * Build and maintain our ReBAC authorization model in OpenFGA, the system every authorization decision on the platform runs through.
 * Own the details of OAuth 2.0 and OIDC in our stack: token flows, JWKS validation, scopes, audience restrictions.
 * Define how AI agents authenticate and receive scoped permissions, so non-human actors operate under the same authorization model as people.
 * Drive technical projects that cut across multiple teams and systems, from design through production.
 * Set technical direction and quality standards for the team and review the work that ships against them.
 * Support and mentor other engineers through code review, design discussions, and day-to-day collaboration., Provides administrative, operational, and program support for employee experience, engagement, and business partner teams. Responsibilities include responding to employee and manager questions, coordinating lifecycle processes, maintaining Workday transactions and records, supporting performance and talent programs, analyzing employee feedback, and administering culture, recognition, mentorship, and engagement initiatives. The role also supports communications, events, reporting, scheduling, and cross-functional talent programs while handling sensitive information with discretion., Lead the technical direction, architecture, and development of Compass, an LLM-powered agent platform. Design multi-agent systems, MCP and A2A integrations, orchestration, evaluation, and observability infrastructure. Drive cross-team technical projects, production support, engineering quality, mentoring, and adoption of AI-assisted development practices. Partner with Product, QA, Design, Operations, and Engineering stakeholders to deliver reliable agentic systems.
Top Skills: A2AAg-UiAmazon S3AWSAws BedrockBedrock AgentcoreFastapiFastmcpLangchainLangfuseLanggraphMcpOauth 2.0PythonRagRest ApisSnowflakeVector Databases
Basis