Developer - Integration​/API Development - Contingent

About Aretum

Aretum is a mission‑driven organization committed to delivering innovative, technology‑enabled solutions to our customers across defense, civilian, and homeland security sectors. Our teams work at the intersection of strategy, technology, and transformation, helping agencies solve their most critical challenges. We believe in investing in our people and creating a culture where collaboration, inclusion, and professional growth are at the forefront.

Design, develop, and test secure integration interfaces connecting vendor‑supplied containerized applications with 10+ disparate client data systems in a Federal cloud environment. This is for a polypharmacy solution in a complex, multi‑system cloud integration solution for Department of Veterans Affairs healthcare system that services millions of veterans. Focus on building robust APIs, data orchestration workflows, and integration patterns that enable risk analysis and service coordination for millions of clients while meeting strict federal security and compliance requirements.

Due to the nature of our work as a federal consulting organization, employees may be expected to handle Controlled Unclassified Information (CUI) and must adhere to applicable safeguarding and compliance requirements.

• Design and implement secure integration interfaces (RESTful APIs, SOAP, message queues, file‑based) connecting vendor applications with client data systems
• Use VA‑endorsed interoperability standards including FHIR R4, CDS Hooks, and SMART on FHIR
• Build error handling, retry logic, and dead‑letter queue patterns for distributed system reliability
• Implement data transformation and validation logic to reconcile disparate source system formats
• Create reusable integration patterns and libraries for scaling to 130+ system instances
• Work with vendor‑supplied containers to understand integration points and API requirements
• Design and implement fault‑tolerant integration patterns with automatic retry, circuit breaker, and graceful degradation strategies
• Develop idempotent APIs and workflows to handle duplicate processing and enable safe retries
• Implement health checks, readiness probes, and self‑healing mechanisms for integration endpoints
• Create disaster recovery procedures including backup strategies, failover mechanisms, and recovery time objective (RTO) compliance
• Design for horizontal scalability to handle variable workload demands across millions of client records
• Implement secure integration patterns including encryption (at‑rest and in‑transit), authentication/authorization (OAuth, API keys, IAM roles), and input validation
• Apply least‑privilege IAM policies for cross‑service and cross‑account access
• Implement audit logging and traceability for compliance requirements
• Handle PII, PHI and other sensitive client data according to federal data protection standards
• Support RMF/ATO process by documenting security controls and providing evidence for assessment
• Create test data sets and mocking strategies for isolated component testing
• Perform load and performance testing on integration endpoints
• Support security testing and vulnerability remediation activities
• Document test plans, test cases, and test results for compliance review
• Build serverless integration workflows using Lambda functions and Step Functions state machines
• Configure API Gateway for RESTful endpoint exposure with throttling and authorization
• Implement event‑driven architectures using Event Bridge, SNS, and SQS
• Manage secrets and configuration using Secrets Manager and Parameter Store
• Monitor integration health using Cloud Watch metrics, logs, and alarms
• Deploy infrastructure‑as‑code using AWS SAM, Cloud Formation, or Terraform

• Bachelor's degree in Computer Science, Software Engineering, Information Technology, or related field
• Relevant professional certifications and demonstrated experience may supplement education
• 8+ years software development experience with focus on integration and API development
• 5+ years hands‑on AWS development experience
• 3+ years in a senior development role
• Experience integrating with COTS/vendor applications (not building from scratch)
• Background…