Senior Backend Engineer – Platform Modernization & Integration

About Goods & Services Goods & Services is a product design and engineering company. We solve mission-critical challenges for some of the world’s largest enterprises, with deep expertise in highly regulated industries—including life sciences and financial services . Our design-led approach allows us to apply cutting-edge capabilities in AI, Data and Hardware Engineering to companies of any size. Headquartered in the United States , we operate regional development centers in Mexico and the United Kingdom . This global footprint—anchored by our nearshore model—enables us to deliver at scale with the speed, efficiency, and cultural alignment our clients expect. At Goods and Services, we value diversity and are committed to creating an inclusive workplace where everyone can thrive. We are proud to be an Equal Opportunity Employer and welcome qualified applicants from all backgrounds. About the job Goods & Services is looking for a Senior Backend Engineer – Platform Modernization & Integration to help strengthen and evolve the platform’s core services, with a focus on improving security, modernizing legacy components, and developing scalable backend solutions. The role will contribute to key platform initiatives, service optimization, workflow orchestration, and the development of new core capabilities. What you’ll do: Design and implement secure API gateway capabilities, including authentication, authorization, token validation, access controls, rate limiting, monitoring, and caching. Consolidate and modernize backend services and APIs to create unified, scalable, and maintainable service interfaces. Decompose legacy monolithic components into modular services and implement event-driven integrations to improve scalability, flexibility, and maintainability. Design and implement workflow orchestration solutions to automate complex business processes, service interactions, and scheduled activities. Develop core platform services, APIs, integrations, and reusable components that support new business capabilities and partner-facing solutions. Support performance testing, traffic-ramp validation, and production migration activities while safely retiring legacy code paths once replacement services are fully validated. What you’ll need: Strong backend engineering experience with hands-on expertise in RESTful API development, API Gateway, IAM, authentication, authorization, and cloud security. Hands-on experience with AWS cloud services, particularly API Gateway, IAM, S3, EventBridge, and Step Functions. Experience designing and implementing event-driven architectures, including AWS EventBridge, event schema design, asynchronous communication, and service integration. Proven experience modernizing and decomposing legacy monolithic applications, using feature flags, incremental migration strategies, and event-driven integration. Hands-on experience with AWS Step Functions, including state-machine design, workflow orchestration, and asynchronous task-token callbacks. Experience designing OAuth2-secured APIs and partner integrations, including multi-tenant configurations and API/SDK development. Experience with third-party service and external system integrations, including APIs, document platforms, authentication providers, and partner services. Experience conducting performance and load testing to validate backend services, APIs, and cloud-based workloads. Experience with observability and production monitoring, including distributed tracing, logging, metrics, and troubleshooting of distributed applications. Experience supporting production migrations and traffic transitions, including traffic validation, feature flags, and safe retirement of legacy components. Strong JavaScript/SDK development skills and ability to contribute to API and partner-facing platform capabilities. Comfortable working in an Agile environment with two-week sprint cycles, collaborating effectively within a cross-functional engineering team.