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Freelance Java Backend Developer Jobs in Flemington, NJ

Monitise

Sr. Backend Engineer

Berkeley Heights, NJ · On-site

Deep expertise in Java and the broader JVM ecosystem. * Frameworks & Microservices: Extensive ... Proficiency with AI-assisted developer tooling (e.g., GitHub Copilot, Cursor, Claude/ChatGPT ...

Fiserv, Inc.

Senior Java Developer

Berkeley Heights, NJ · On-site

$97K - $164K/yr

Design, develop, and maintain backend Java applications and enterprise microservices that support scalable and secure business solutions. Partner with engineering, product, and DevOps teams to ...

Monitise

Senior Java Developer

Berkeley Heights, NJ · On-site

$97K - $164K/yr

Design, develop, and maintain backend Java applications and enterprise microservices that support scalable and secure business solutions. Partner with engineering, product, and DevOps teams to ...

Collabera

Java Developer

Philadelphia, PA

$51.50 - $66.50/hr

Backend technology experience should include Java Enterprise Edition, Enterprise Java Beans 3.0, JPA, and JMS as well as Database experience with Oracle and MySQL. Qualifications * Strong debugging ...

3MK Software Solutions

Sr Java Developer

Bridgewater, NJ · On-site

$58.50 - $74.50/hr

... Java Software Engineer, Server Side Development - EBU Design and develop n-tier applications in ... backend systems. Code refactoring Skills & Experience Required N-Tier design and development.

TMS

Full Stack Java Developer

Fort Washington, PA · On-site

$65 - $70/hr

HTML5, CSS3, JavaScript/TypeScript - Experience with backend development using Java, Spring Boot ... of DevOps practices and CI/CD Pipelines - Experience with version control systems (e.g., Git ...

DEW Softech Inc

Java Application Developer

Trenton, NJ · On-site

$50 - $55/hr

Java Application Developer Location: Trenton, NJ; Candidates must work 3 days a week ON-SITE 8-4:30 ... web applications and backend systems * Develop new upgrades and features for the existing ...

Quantix

Java Engineer

Philadelphia, PA · On-site

$52.25 - $71.75/hr

Java Engineer Location: Philadelphia, PA Type: Direct Hire Client located with offices in ... Responsibilities included full lifecycle development with an emphasis on backend development.

FreshDirect

Sr. Full Stack Developer

Woodbridge, NJ · On-site

$130K - $155K/yr

What You'll Do As a Senior Backend Developer (Java) , you'll help design, develop, and scale backend systems that power FreshDirect's e-commerce and logistics platforms. You'll collaborate with cross ...

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Freelance Java Backend Developer information

See Flemington, NJ salary details

$10

$55

$74

How much do freelance java backend developer jobs pay per hour?

As of Aug 9, 2026, the average hourly pay for freelance java backend developer in Flemington, NJ is $55.22, according to ZipRecruiter salary data. Most workers in this role earn between $49.09 and $63.65 per hour, depending on experience, location, and employer.
What cities near Flemington, NJ are hiring for Freelance Java Backend Developer jobs? Cities near Flemington, NJ with the most Freelance Java Backend Developer job openings:
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Backend API's and Integrations Software Engineer III

RELX Group plc

Philadelphia, PA • On-site

$78K - $131K/yr

Full-time

Re-posted 13 days ago

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.
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