The operational problem
Federal systems needed a consistent way to exchange sensitive citizen information while moving from legacy SOAP boundaries toward standardized REST APIs.
Built 30+ Spring Boot REST components for secure federal interoperability.
Why this system exists
A layered REST facade could standardize validation, errors, security, mapping, and contracts while preserving required legacy service behaviour during modernization.
Ayub worked inside a large federal program with shared architecture, formal Scrum delivery, protected-data controls, and team ownership.
How the work moves
- Receive service story
- Define contract
- Implement controller and service
- Map and persist
- Apply security and validation
- Test business and error paths
- Review in Scrum team
What shaped the solution
Protected B information and federal security controls.
Interoperability with existing government systems.
Backward-compatible modernization of legacy service boundaries.
Large-program team context with shared ownership.
What I owned
Designed
Owned REST contracts and layered component boundaries
Developed
Controllers, services, repositories, DTOs, mappers, and persistence
Integrated
Legacy SOAP behaviour, PostgreSQL, OpenAPI, Azure APIM, and service security
Tested
Business rules, validation, errors, and owned unit surface
Collaborated
Product, business analysis, development, testing, and coached Scrum team
Decisions that carried the work
Standardize the service shape
Consistent controller, service, repository, DTO, mapping, validation, and error patterns made the API work easier to maintain and review.
Secure every boundary
OAuth 2.0, JWT validation, mutual TLS, and Azure API Management controls were part of handling sensitive service-to-service data.
Test the owned surface completely
Unit tests covered the business and error paths of each owned component, reaching 100% coverage within that explicit boundary.
Verified outcome
Built more than 30 REST components for the interoperability platform.
Maintained 100% unit coverage on owned components.
Contributed to death-notification workflows that helped benefit systems update records.
Supported modernization from SOAP services to REST, JSON, and OpenAPI interfaces.
What I will not overclaim
This was a contribution within a large federal program. The case study does not claim ownership of the full OASIS or Benefits Delivery Modernization platform.
Verified from the ESDC condensed and full professional-history records. Sensitive system details are generalized.