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Fulltime Freelance Java Developer Jobs in New York, NY

Ninth Wave

AI Java Developer

Manhattan, NY

$56.25 - $72.75/hr

Ninth Wave AI Java Developer Full Time Opportunity New York City, NY Job Summary We are hiring an AI Java Developer to extend the Compass platform: a Spring Boot application backed by OpenSearch and ...

Ninth Wave

AI Java Developer

Manhattan, NY · On-site

$56.25 - $72.75/hr

Ninth Wave AI Java Developer Full Time Opportunity New York City, NY Job Summary We are hiring an AI Java Developer to extend the Compass platform: a Spring Boot application backed by OpenSearch and ...

Ninth Wave

AI Java Developer

Manhattan, NY · On-site

$100K - $125K/yr

Ninth Wave AI Java Developer Full Time Opportunity New York City, NY Job Summary We are hiring an AI Java Developer to extend the Compass platform: a Spring Boot application backed by OpenSearch and ...

HSSSoft

Java EXT JS Developer

Edison, NJ · On-site

$52.75 - $68.25/hr

Java Developer with EXT JS. Location ... Edison, NJ. Duration: Full Time. Thanks and regards Raju Additional Information All your ...

Sarian, Inc.

Sr. Java Developer

Manhattan, NY · On-site

$63 - $80.50/hr

New York City, Jersey City- Fulltime Position Skill: Java Developer * Clear articulate communication skills - We collaborate often and look for developers that are able to break problems down ...

Sonoma Consulting Inc.

Java Developer (J2EE)

Edison, NJ · On-site

$52.75 - $68.25/hr

This is a Full-Time / Permanent job opportunity. Only US Citizen and Green Card Holder can apply. ** All your information will be kept confidential according to EEO guidelines. Titles: Java Developer ...

Sarian, Inc.

Java Developer

Jersey City, NJ · On-site

$53.25 - $69/hr

Java Developer Location ... Jersey City NJ Fulltime position Onsite position ****NO C2C**** JD: * Java web-based technologies.

Serigor Inc.

Core Java Developer

New York, NY · On-site

Fulltime The Client is seeking a technically oriented individual to join the Securities Finance ... Core Java Developer with Strong coding, designing, database and redis experience.

Esolvit Inc

Java Developer

New York, NY

$55.75 - $72.25/hr

Permanent/Full Time Role ? We are looking at well-rounded and hands-on Java Architect with a ... Hands on experience with modern CI, DevOps, Continuous Delivery. ? Experience defining standards ...

Capgemini

Java Developer

New York, NY · On-site

$106K - $145K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Senior Java Engineer * Location: NY * Type: FTE role only no C2C or C2H or Subcontractor. * Mode ... Capgemini offers a comprehensive, non-negotiable benefits package to all regular, full-time ...

United Airlines

Java Developer

Manhattan, NY

$106K - $145K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Senior Java Engineer * Location: NY * Type: FTE role only no C2C or C2H or Subcontractor. * Mode ... Capgemini offers a comprehensive, non-negotiable benefits package to all regular, full-time ...

ACI Infotech

Java Developer - OPT Hiring

Piscataway, NJ · On-site

$51 - $66/hr

Remote Immediate Start Full Time OPT Candidates are accepted ( Will file H1B-2022 in Quota) 5+ years of experience in Java Development / JEE Strong hands-on experience in Java (11), Spring Boot ...

AWSPRODVK1

Java Developer

Jericho, NY · On-site

$2.1K - $3.2K/yr

We are currently seeking an experienced backend developer with 3+ years of experience and expertise ... Job Type: Full-time Schedule: * Evening shift * Monday to Friday * Weekend availability

AWSPRODVK1

Java Developer

Jericho, NY · On-site

We are currently seeking an experienced backend developer with 3+ years of experience and expertise ... Job Type: Full-time Schedule: * Evening shift * Monday to Friday * Weekend availability

Northern Base

Senior Java Developer

Jersey City, NJ · On-site

$59.75 - $76.25/hr

Hiring Alert | Senior Java Developer Location ... Jersey City, NJ (Onsite) Employment Type: Full-Time Experience Required: 10-20 Years Visa Type: USC ...

ACI Infotech

Sr Java Developer / Lead

Somerset, NJ · On-site

Hybrid Duration: FULL TIME Key Skills: Java SQL and Strong MS Azure / AWS Accepting H1B transfer candidates We are seeking an exceptional Sr Java Developer / Lead to join our team, someone who is ...

ISL Techsolutions

Java Developer

Bronx, NY · On-site

$53.25 - $68.75/hr

Java Developer Location ... NYC, NY Duration : Long term // Full time The Role: As part of our global team you will be ...

ISL Techsolutions

Java Developer

Bronx, NY · On-site

$53.25 - $68.75/hr

Java Developer Location ... NYC, NY Duration : Long term // Full time The Role: As part of our global team you will be ...

Continental Technology Solutions

Java Developer

New York, NY

$55.75 - $72.25/hr

Java Developer Long Island, NY Full Time Candidate should have minimum 4 years of IT experience as a front-end developer The candidate should have prior experience on front end technologies involving ...

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Fulltime Freelance Java Developer information

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

As of Aug 16, 2026, the average hourly pay for fulltime freelance java developer in New York, NY is $62.03, according to ZipRecruiter salary data. Most workers in this role earn between $53.65 and $69.42 per hour, depending on experience, location, and employer.

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Fulltime Freelance Java Developer jobs near you

AI Java Developer

Ninth Wave

Manhattan, NY

$56.25 - $72.75/hr

Full-time

Re-posted 28 days ago

Job description


Ninth Wave

AI Java Developer

Full Time Opportunity

New York City, NY

Job Summary

We are hiring an AI Java Developer to extend the Compass platform: a Spring Boot application backed by OpenSearch and AWS Bedrock that helps U.S. banks publish, monitor, and govern their open-banking / FDX data-sharing APIs. You will build backend services that ingest bank-supplied artifacts (Postman collections, OAS, configuration files), expose them through REST + Thymeleaf admin surfaces, and integrate LLM-driven assistance (Bedrock Knowledge Bases + Agents, RAG over our internal corpus) into the day-to-day operator workflow.

The role is hands-on Java + Spring Boot with meaningful GenAI integration work - not a research role and not a pure prompt-engineering role. You'll own features end-to-end, from OpenSearch index design through Bedrock Agent wiring to the admin UI that exposes them.

Key Responsibilities

  • Design and develop services in the Compass Spring Boot codebase - REST APIs, admin Thymeleaf views, OpenSearch-backed data flows.
  • Integrate AWS Bedrock (Claude family models, Knowledge Bases, Agents) into Java services for RAG, summarization, and operator-assist features.
  • Build and maintain ingestion pipelines that turn bank-supplied artifacts (Postman collections, configuration YAML, FDX mapping spreadsheets) into structured OpenSearch documents.
  • Wire OpenSearch indexing, tenant-scoped routing and vector search for RAG retrieval.
  • Implement CI/CD via the existing GitHub-based pipelines; keep build and deploy times honest.
  • Optimize application performance, scalability, and security
  • Collaborate with the mappings team, the Bedrock / KB content team, and the frontend / Thymeleaf maintainers to define and ship features.
  • Write clean, maintainable, well-documented Java; favor small focused commits and reversible changes.
  • Stay current with the Java ecosystem and the GenAI tooling landscape

Required Skills & Qualifications

Technical Skills

  • Strong proficiency in Java 17+
  • Spring Boot
  • Spring MVC + Thymeleaf
  • REST API design - JSON-in / JSON-out, paginated search endpoints, multipart upload
  • Microservices / service-oriented design within a single deployable
  • Hands-on OpenSearch / Elasticsearch experience
  • Experience integrating LLMs into Java applications via REST clients or SDKs - AWS Bedrock preferred
  • RAG architectures - chunking, embedding, retrieval, citation
  • Vector databases
  • Cloud platform experience - AWS, specifically:
    • Elastic Beanstalk (Compass deploy target - not Kubernetes)
    • Bedrock (KB + Agents)
    • S3, IAM, CloudWatch
    • Multi-account Organization layout
  • Experience with Git, Maven, and CI/CD pipelines
  • Comfortable with relational and unstructured databases

Preferred Skills

  • Prior work in fintech / open banking / FDX / account-aggregation / payment-network connectivity - or willingness to learn the domain fast.
  • Experience with Generative AI and LLM applications in production
  • Familiarity with Python for AI prototyping and one-off data tooling
  • Experience with AI security, prompt-injection defense, and data-privacy standards
  • Exposure to Postman collection parsing
  • Exposure to Atlassian APIs

Educational Requirements

  • Bachelor's or Master's degree in Computer Science, Software Engineering, Artificial Intelligence, or related field - or equivalent demonstrable experience shipping production Java + GenAI systems.

Apply