Backend API’s and Integrations Software Engineer III

Elsevier; City Of London; On-site; GBP 58,000 - 97,000; Full time

Benefits offered by this job

Annual incentive bonus

Country-specific benefits

Job summary

Elsevier is seeking a Backend API and Integrations Engineer III to design, build, and operate distributed services and APIs at scale. The role focuses on Kong API Management, HL7 FHIR, and enterprise integrations using Java and JavaScript.

You will work on YAML declarative configs, CI/CD, OpenAPI specs, and security-driven design while delivering production-grade, observable services with a focus on reliability and performance.

Qualifications

• 3+ years of backend software engineering experience.
• Proficient in Java; working knowledge of JavaScript/Node.js.
• RESTful API design, OpenAPI/Swagger, and contract testing.
• Experience with Kong APIM, YAML configs, and CI/CD.
• Distributed systems fundamentals and microservices.
• Networking basics, TLS/mTLS, HTTP/2/1.1.
• FHIR data and HL7 adapters familiarity.

Responsibilities

• Design and build distributed services and integrations.
• Implement resilient microservices with Java and Node.js.
• Apply scaling, fault tolerance, and backpressure practices.

Skills

Java

JavaScript

API design

Microservices

Cloud

Security

Testing/CI CD

Networking fundamentals

Tools

Kong API Gateway

OpenAPI/Swagger

CI/CD

Docker

Kubernetes

HL7 FHIR

Job description

Backend API’s and Integrations Software Engineer III

Are you a Backend API developer looking to work for a mission driven global organization?

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.

Required Qualifications

• 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).

U.S. National Base Pay Range: $78,800 - $131,300. Geographic differentials may apply in some locations to better reflect local market rates.

This job is eligible for an annual incentive bonus.

We know your well-being and happiness are key to a long and successful career. We are delighted to offer country specific benefits.

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