Full-Stack Application Developer (Java, JavaScript)

Quick Facts

• Role: Full-Stack Application Developer (Java, JavaScript)
• Contract: 1 year; part-time variable hours (10–29 hrs/week)
• Work type: W2 or 1099

Description

Build Java services that ingest public health IT data, observe deployed FHIR endpoints, validate results, and assemble reproducible evidence cases for compliance review. Implement deterministic validators (pass/fail logic) plus retry, rate-limiting, and instrumentation to keep monitoring safe and repeatable—while ensuring AI components do not make final compliance calls. Make test runs replayable so reviewers can re-run evidence for any case.

Responsibilities

• Build ingestion connectors for CHPL and other approved public sources; preserve raw artifacts, timestamps, request metadata, response headers, and hashes.
• Normalize developer, product, version, criterion, CHPL ID, endpoint, organization, and validation records into a common data model in DynamoDB with lineage and source-of-truth precedence rules.
• Implement publication checks to classify endpoint availability failures (URL not found, timeouts, obscuring redirects, malformed responses, non-machine-readable content).
• Observe endpoints safely without authentication for metadata and CapabilityStatement retrieval; detect drift as endpoints change.
• Run FHIR R4 validation against Endpoint, Organization, and Bundle resources and preserve raw and normalized results.
• Assemble evidence case packages with source metadata, request/response logs, validation outputs, severity, and rule traceability; support deduplication, clustering, and export to government-designated systems.
• Design scheduling, retry/backoff, rate limiting, error handling, and audit logging for the pipeline and agentic components.
• Create replayable test runs and develop unit/integration tests with stub and mock endpoints for failure scenarios.
• Participate in code review and keep technical documentation current.
• Ensure the system does not request, collect, or store patient data, PHI, credentials, or tokens unless authorized in writing.

Requirements

• 5+ years Java (17+) development, including concurrency and networked services
• 3+ years Spring Boot or an equivalent framework
• 2+ years JavaScript/Node for tooling and front-end development
• 4+ years building REST APIs and working with JSON
• 3+ years working knowledge of HTTP and TLS fundamentals
• 3+ years AWS SDK, DynamoDB data modeling, and S3
• 2+ years building and running containerized services
• 4+ years automated testing (JUnit, integration tests)
• 3+ years code review and technical documentation
• 1+ year building with LLM APIs or using AI coding assistants in development, including testing and validating AI-generated output
• Authorized to work in the United States

Benefits

• 401(k) and company match
• PTO that grows the longer you stay
• Health, vision, and dental insurance
• Company provided life insurance and voluntary life insurance
• Short-term and long-term disability