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

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Broadway VenturesHealth IT

Location: Remote - United StatesContractSenior

SalaryW2: pay rate of $55 - $60/hr; 1099: $65 - $70/hr

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Job Details

Experience: 5+ years of Java (17+) development; 3+ years of Spring Boot or equivalent; 2+ years of JavaScript/Node; 4+ years building REST APIs and working with JSON; 3+ years of HTTP and TLS fundamentals; 3+ years with AWS SDK, DynamoDB data modeling, and S3; 2+ years building and running containerized services; 4+ years of automated testing; 3+ years of code review and technical documentation; 1+ year building with LLM APIs or using AI coding assistants.
Required Skills: Node.jsDynamoDBJavascriptSpring BootRESTful APIsJSON

Requirements

5+ years of Java (17+) development, including concurrency and networked services.
3+ years of Spring Boot or an equivalent framework.
2+ years of JavaScript/Node for tooling and front-end development.
4+ years building REST APIs and working with JSON.
3+ years of working knowledge of HTTP and TLS fundamentals.
3+ years with the AWS SDK, DynamoDB data modeling, and S3.
2+ years building and running containerized services.
4+ years of automated testing, including JUnit and integration tests.
3+ years of 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.
Preferred: HAPI FHIR or other FHIR R4 validation experience, including US Core and CapabilityStatements.
Preferred: HTTP client internals, including timing and connection instrumentation.
Preferred: Scheduling, retry and backoff, and rate-limiting design.
Preferred: Testcontainers or stub and mock services for failure testing.
Preferred: SMART on FHIR, Inferno, ONC certification testing, or health IT or federal program experience.

Responsibilities

Build ingestion connectors for CHPL, Service Base URL Lists, developer-published FHIR Bundles, Lantern, and other approved public sources, preserving raw artifacts, timestamps, request metadata, response headers, and hashes.
Normalize developer, product, version, criterion, CHPL ID, endpoint, organization, and validation records into the common data model in DynamoDB, with lineage and source-of-truth precedence rules.
Implement publication checks that fetch endpoint lists and classify availability failures, including missing URLs, timeouts, obscuring redirects, malformed responses, and non-machine-readable content.
Build safe, non-authenticated endpoint observation for metadata and CapabilityStatement retrieval, and detect endpoint drift.
Run FHIR R4 validation against Endpoint, Organization, and Bundle resources, preserving raw and normalized results.
Build evidence case packages containing source metadata, request and response logs, validation outputs, severity, and rule traceability; support deduplication, clustering, and export.
Design scheduling, retry and backoff, rate limiting, error handling, and audit logging for pipeline and agentic components.
Make test runs replayable so reviewers can rerun tests for any evidence case.
Write unit and integration tests, including stub and mock endpoints for failure scenarios; participate in code review and maintain technical documentation.
Prevent code from requesting, collecting, or storing patient data, PHI, credentials, or tokens unless the Government authorizes it in writing.

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