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

New

Remote work arrangement within eligible U.S. states.ContractSenior

Salary55 - 60 USD per hour

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Job Details

Experience: At least 5 years of Java 17+ development experience; at least 3 years with Spring Boot or an equivalent framework; at least 2 years of JavaScript/Node.js experience; at least 4 years building REST APIs and working with JSON; at least 3 years working knowledge of HTTP and TLS fundamentals; at least 3 years with the AWS SDK, DynamoDB data modeling, and Amazon S3; at least 2 years building and operating containerized services; at least 4 years of automated testing experience; at least 3 years conducting code reviews and producing technical documentation; at least 1 year building with LLM APIs or using AI coding assistants.
Required Skills: Node.jsDynamoDBJavascriptJUNITSpring BootRESTful APIsJSON

At least 5 years of Java 17+ development experience, including concurrency and networked services.
At least 3 years of experience with Spring Boot or an equivalent framework.
At least 2 years of JavaScript/Node.js experience for tooling and front-end development.
At least 4 years of experience building REST APIs and working with JSON.
At least 3 years of working knowledge of HTTP and TLS fundamentals.
At least 3 years of experience with the AWS SDK, DynamoDB data modeling, and Amazon S3.
At least 2 years of experience building and operating containerized services.
At least 4 years of automated testing experience, including JUnit and integration testing.
At least 3 years of experience conducting code reviews and producing technical documentation.
At least 1 year of experience building with LLM APIs or using AI coding assistants in software development, including testing and validating AI-generated output.
Preferred: experience with HAPI FHIR or other FHIR R4 validation tools and standards, including US Core and CapabilityStatements.
Preferred: experience with HTTP client internals, scheduling and retry strategies, rate limiting, Testcontainers or stub and mock services, SMART on FHIR, Inferno, or ONC certification testing.

Build ingestion connectors for CHPL, Service Base URL Lists, developer-published FHIR Bundles, Lantern, and other approved public sources.
Preserve source artifacts, timestamps, request metadata, response headers, and hashes for traceability and reproducibility.
Normalize developer, product, version, criterion, CHPL ID, endpoint, organization, and validation records into the common data model in DynamoDB.
Implement publication checks that retrieve endpoint lists and classify availability failures.
Build non-authenticated endpoint observation capabilities for metadata and CapabilityStatement retrieval, and detect endpoint drift.
Run FHIR R4 validation against Endpoint, Organization, and Bundle resources, preserving raw and normalized results.
Assemble evidence case packages with source metadata, request and response logs, validation outputs, severity assessments, and rule traceability.
Design and maintain scheduling, retry and backoff, rate limiting, error handling, and audit logging for pipeline and agentic components.
Develop unit and integration tests, including stub and mock endpoints, and ensure test runs can be replayed.
Participate in code reviews, maintain technical documentation, and keep AI-generated summaries separate from deterministic compliance validation.

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