> Markdown version of [/jobs/ext/1422547-backend-api-s-and-integrations-software-engineer-iii](https://www.wearedevelopers.com/jobs/ext/1422547-backend-api-s-and-integrations-software-engineer-iii). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Backend API's and Integrations Software Engineer III - **Company:** RELX Group plc - **Location:** Philadelphia, PA, United States - **Experience:** Experienced - **Salary:** $78,800.0 - $131,300.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), JavaScript (Programming Language), Application Programming Interfaces (APIs), Proxy Servers, Automation of Tests, Cloud Computing, Cyber Security, Computer Networks, System Configuration, Continuous Integration, Distributed Systems, Domain Name System (DNS), Fault Tolerance, Hypertext Transfer Protocols (HTTP), Traceroute, CURL, Networking Basics, Node.Js, OAuth, OpenID, Swagger, Service Discovery, Software Engineering, Systems Integration, TCP/IP, Management of Software Versions, YAML, Openapi, Data Logging, Transport Layer Security, Load Balancing, Fast Healthcare Interoperability Resources, Caching, Backend, Rate Limiting, Build Management, Kubernetes, Enterprise Integration, Front End Software Development, Api Gateway, Restful APIs, Api Management, Docker, Web Api, Microservices - **Published:** July 24, 2026 - **Apply:** https://dejobs.org/x/x/48AFAF6800C0451F92BE41124EC7D838/job/ ## About the Role * 3+ years of Professional Experience in backend software engineering. * Languages: Proficient in Java; working proficiency in JavaScript/Node.js. * API & Integrations: RESTful API design, OpenAPI/Swagger, contract testing, backward compatibility/versioning. * API Gateway / Kong APIM: Hands-on experience configuring routes, plugins, auth, rate limiting, and declarative YAML configs; CI/CD integration. * Distributed Systems: Understanding of microservices fundamentals: statelessness, service discovery, retries/circuit breakers, caching. * Networking Fundamentals: TCP/IP, DNS, TLS/mTLS, HTTP/2/HTTP/1.1, proxies, load balancing, and common troubleshooting (cURL, traceroute, etc.). * Data & FHIR Facade: Experience working with HL7 FHIR or adapters; familiarity with FHIR resource modeling and transformations (e.g., Patient, Observation, Encounter). * Testing & Quality: Unit, integration, and contract testing; test automation and CI/CD pipelines (YAML-based workflows). * Cloud & Ops: Experience deploying and operating services in a cloud or containerized environment (Docker/Kubernetes). ## Description About the role: We're seeking a Software Engineer III with strong backend engineering skills to design, build, and operate distributed integration services and APIs at scale. You will focus on Kong API Management, backend API lifecycle (setup, testing, maintenance), HL7 FHIR, and enterprise integrations, primarily using Java and JavaScript. The ideal candidate has solid network fundamentals, can work comfortably with YAML (for declarative configs and pipelines), and thrives in pragmatic, production-oriented engineering-no frontend development in this space. About the team, this team is building a generative-AI-powered clinical decision support tool designed specifically to help healthcare professionals quickly find trusted, evidence-based answers at the point of care. It combines a massive curated medical knowledge base with conversational AI so clinicians can ask questions in natural language and get concise, clinically relevant responses backed by real scientific evidence. Responsibilities * Design & Build Distributed Services * Implementing resilient, observable microservices and integration components (Java preferred; Node.js/JavaScript where appropriate). * Applying patterns for scaling, fault tolerance, idempotency, and backpressure in distributed environments. * API Platform & Kong APIM * Configuring and managing Kong Gateway (routes, services, plugins, rate limiting, auth, mTLS, logging) via declarative config (YAML) and CI/CD. * Implementing gateway policies for security, traffic control, blue/green/canary releases, and zero-downtime migrations. * Integrations & Data Facades * Building and maintaining a FHIR data facade that maps internal domain data to FHIR resources (read/search/transform), ensuring correctness and performance. * Developing backend integrations with downstream systems (REST, gRPC, messaging/queues) and handle schema/contract evolution. * API Engineering * Owning the API lifecycle: design (OpenAPI), implementation, automated testing (unit/integration/contract), versioning, and SLO-driven operations. * Creating and maintaining OpenAI specs, mocks, and validation pipelines. * Security & Compliance * Implementing OAuth2/OIDC flows, token introspection, and service-to-service auth. Apply secure coding practices and least-privilege network policies; partner with InfoSec on reviews. ## Related Videos - [Why make use of an integration platform in today's software developments and infrastructure?](https://www.wearedevelopers.com/videos/758-why-make-use-of-an-integration-platform-in-today-s-software-developments-and-infrastructure) - [Don’t Insert Crazy! 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