Senior Software Engineer - Elixir

Green Light is a healthcare technology company focused on helping health plans maximize the value of healthcare spending through reliable, high-performance systems. The Senior Software Engineer will design, build, and operate Elixir-based full-stack production systems, owning architecture, performance, reliability, and long-term technical direction while supporting healthcare negotiation and dispute resolution workflows.

Responsibilities:

• Design, build, and operate production systems using Elixir, OTP, and Phoenix
• Own services end-to-end: architecture, implementation, deployment, and production support
• Build interactive user interfaces
• Design and evolve systems for high-throughput data processing
• Work with relational database systems
• Improve system performance, observability, and reliability in production
• Participate in incident response, debugging, and root cause analysis
• Contribute to architectural decisions with a focus on long-term maintainability
• Collaborate across engineering, product, and operations to deliver high-impact features
• Mentor engineers and contribute to a strong engineering culture
• Apply secure coding practices and ensure systems meet healthcare data privacy and security requirements
• Designing and implementing systems on top of large-scale data platforms
• Building performant workflows for analyzing and comparing complex reimbursement scenarios
• Partnering with domain experts to translate regulatory and operational requirements into robust software systems

Requirements:

• Strong production experience with Elixir, including OTP and BEAM fundamentals
• Experience building applications with Phoenix
• Experience with Git-based version control workflows and source code management platforms, including branching strategies and merge/pull request processes
• Familiarity with agile development practices, including sprint planning, backlog refinement, and iterative delivery
• Experience working with CI/CD pipelines - maintaining, troubleshooting, and supporting automated build and deployment workflows
• Ability to write clear, well-scoped tickets and manage work items throughout the development lifecycle
• Experience designing and operating distributed systems or high-reliability services
• Experience working with relational databases in production environments
• Strong understanding of functional programming principles
• Experience building APIs and backend systems
• Experience conducting peer code reviews and providing constructive, actionable feedback
• Ability to reason about performance, concurrency, and system trade-offs
• Comfortable owning production systems, including incident response
• Experience working in Linux-based or containerized environments, including Docker
• LiveView experience is a plus
• Experience working with very large datasets or data-intensive systems
• Familiarity with observability tooling (metrics, tracing, logging)
• Experience in healthcare or other regulated domains
• Exposure to interoperability standards (e.g., claims, EDI, HL7, FHIR)