Software Engineer - Authentication - Eleven

We Move Fast, Think on Our Feet, and Have Fun Doing It!

At Eleven , we thrive on solving complex challenges and pushing boundaries. We work at a rapid pace, embracing change, and staying laser-focused on delivering exceptional value to our customers.

We’re looking for visionary problem-solvers who excel in dynamic environments, embrace AI tools in streamlining work processes, adapt quickly, and drive innovation. If you love thinking outside the box, collaborating with top-tier talent, and having fun while making an impact—let’s talk!

Position Overview:

In this Software Engineer-Authentication role you will build and maintain AWS serverless integrations that connect our captive portal WiFi platform with hotel Property Management Systems (PMS) and loyalty programs worldwide. Using primarily C#/.NET and AWS Serverless, you'll develop integrations that enable hotel guests to authenticate via room number lookups, post charges to guest folios, and enroll in loyalty programs — all through our captive portal. Every day, tens of millions of hotel guests across major hospitality brands benefit from the services we provide.

Reporting Relationships:

This role reports to an Engineering Manager and has no direct reports.

Essential Job Functions & Core Responsibilities:

• Develop, test, and maintain AWS Serverless applications (C# / .NET) that connect our platform with third-party PMS and loyalty APIs
• Implement SQS-triggered message processing pipelines that handle guest inquiry, room charge, configuration, and loyalty enrollment work units
• Integrate with third-party REST, SOAP, including OAuth2/Cognito authentication flows, token caching, and credential management via AWS SSM Parameter Store
• Build and maintain DynamoDB data models for device configuration, session caching, and authentication token storage
• Write comprehensive unit tests using mocking frameworks
• Leverage AI-assisted development tools (e.g., GitHub Copilot, agentic coding assistants) to accelerate development, improve code quality, and automate repetitive tasks
• Collaborate with other development, product management, and UX team members to turn user stories into performant, scalable capabilities within the ecosystem
• Troubleshoot production issues across distributed serverless architectures
• Participate in code reviews and contribute to consistent patterns across the team's portfolio of integrations
• Work within Agile methodology with two-week sprints
• Identify and incorporate security requirements in the software development lifecycle, including PII handling, data obfuscation, and secure credential storage
• Participate in on-call rotation
• Other duties as assigned

Working Conditions

This role routinely uses standard office equipment such as computers, phones, and printers. This job opera