Application Developer (Java, JavaScript) (Full-Stack)

Role overview Build backend services and supporting tools for a public health IT monitoring system. The work gathers information from approved public sources, checks published FHIR endpoints, and creates repeatable evidence packages for human review. Validation rules make the final pass or fail determinations; AI components may assist with summaries but do not decide compliance.

Responsibilities - Develop ingestion connectors that retain source artifacts, timestamps, request details, response headers, and hashes. - Normalize product, developer, endpoint, organization, and validation records in DynamoDB, with clear source lineage. - Check endpoint availability and observe public metadata without authentication; detect when endpoints change or disappear. - Validate FHIR R4 Endpoint, Organization, and Bundle resources, preserving both original and normalized results. - Assemble traceable evidence packages and design safe scheduling, retries, rate limits, audit logs, and replayable test runs. - Write automated tests, review code, maintain technical documentation, and prevent collection of patient data or credentials unless expressly authorized.

Requirements - 5+ years developing Java 17+ services, including concurrency and networked applications; 3+ years with Spring Boot or an equivalent framework. - 2+ years using JavaScript or Node.js, plus 4+ years building REST APIs and working with JSON. - 3+ years with HTTP and TLS fundamentals, and 3+ years using AWS SDK, DynamoDB, and S3. - 2+ years building and running containers; 4+ years of automated testing and 3+ years of code review and technical documentation. - At least 1 year building with LLM APIs or using AI coding assistants, including validating generated output. - Authorized to work in the United States.

Nice to have - FHIR R4 validation experience, including HAPI FHIR, US Core, or CapabilityStatements. - Experience instrumenting HTTP clients, designing retries and rate limits, or testing with Testcontainers and mock services. - Familiarity with SMART on FHIR, Inferno, certification testing, health IT, or federal programs.

Benefits and work setup - Part-time contract, variable at 10–29 hours per week, for one year; W-2 and 1099 arrangements are available. - The listing gives hourly ranges of $55–$60 for W-2 and $65–$70 for 1099, subject to contract conditions. - Benefits described include health, dental, and vision coverage, 401(k) match, paid time off, life insurance, and disability coverage. - Applicants must live and work in an eligible U.S. state; several states and jurisdictions are excluded.