Top Senior Java Developer Jobs in NYC, NY

Develop and maintain full‑stack web and enterprise applications using Java and modern JavaScript stacks. Build REST/SOAP services, design data models, implement responsive UIs (AngularJS/React), work with relational and NoSQL databases, apply design patterns, perform testing and debugging, and support deployment on cloud and app servers.

Senior Java developer responsible for designing and implementing server- and client-side web applications using Java/J2EE, frameworks (Spring, Hibernate, JSF/Struts), rich UI frameworks, SOA/Web Services, and automation tools. Collaborate in agile/TDD environments to build APIs, frameworks, and core business logic for distributed, real-time systems.

Lead backend architecture and implementation for Citi's FX eCommerce trading platform. Build high-performance, multithreaded Java services, integrate with product teams, resolve complex system issues, coach mid-level developers, and ensure resilient, low-latency, production-ready solutions that meet regulatory and risk standards.

Design, develop, test, and deploy Web3 components and backend services for Citi's digital asset platform. Build smart contracts, blockchain protocol connectors, event-driven systems, wallet integrations, and custody/tokenization integrations. Collaborate in a distributed Agile team, perform code reviews, maintain security best practices, and contribute architecture and documentation for production-grade institutional Web3 infrastructure.

Design, develop, unit test and maintain features for a business-critical website as a full-stack developer. Collaborate with product owners, security, QA and stakeholders within a SAFe agile team. Follow release/build/configuration management and project governance, maintain documentation, and work on microservices and front-end technologies.

The Senior Software Engineer will develop APIs and microservices for Disney's commerce platforms, collaborating with product teams and overseeing the end-to-end software development lifecycle.

Design, develop, and optimize low-latency, high-throughput Java backend services and RESTful microservices for payments. Deploy and scale on OpenShift/Kubernetes and AWS, integrate with MongoDB and other datastores, improve performance, observability, and fault tolerance, and mentor peers while driving architectural best practices.

Design, build, and maintain scalable J2EE business applications. Implement features, fix bugs, participate in code reviews, automate tests, optimize performance, and produce documentation.

Lead backend Java development and architecture for enterprise applications. Design and deliver scalable, resilient microservices and APIs, mentor developers, lead technical decisions, support production incidents, and implement CI/CD and cloud-native solutions on AWS.

Develop and maintain web applications using GWT, Java and J2EE. Collaborate with team to implement features, troubleshoot issues, and integrate with backend systems. Familiarity with Spring, Hibernate and SQL is desired.

Develop and implement J2EE web applications using Java and Spring on WebSphere. Participate in full lifecycle: requirements, design, coding, testing, performance tuning, deployment, production support, and mentor junior developers.

Contract Java Developer (12-16 month contract) to develop and maintain applications using GWT, Java and J2EE. Must have GWT expertise; Spring, Hibernate and SQL are desirable. Located in New York; requires 5+ years of relevant experience.

Design, develop, and maintain scalable backend systems and microservices for fintech products. Build REST APIs, support greenfield projects and improve existing systems (card payments, treasury, transactions, crypto liquidity). Use Java and Spring Boot with Postgres, practicing TDD, DDD, and CI/CD to deliver maintainable, high-performance services.

Design, develop, and maintain scalable backend systems and microservices (payments, treasury, transactions, crypto). Build REST APIs, use Java and Postgres, apply Spring Boot, TDD, DDD, and CI/CD to deliver maintainable, high-performance services.

Develops high-quality, maintainable Java software with a small team. Provides guidance to client teams on modern software development practices and scalable application design. Uses test-driven development, collaborates on digital solutions, and participates in ongoing training and professional development.

Design, develop, and modernize full-stack web applications using Java and Angular in a cloud microservices architecture. Build and deploy Dockerized services on AWS (ECS/ECR), implement REST APIs, write unit and automated tests, enforce code quality in GitLab pipelines, collaborate in Agile teams, and mentor teammates. Participate in sprint ceremonies, manage user stories, perform testing (functional, exploratory, performance), and resolve defects to deliver reliable production software.

Design, develop, and maintain Java-based backend services and APIs for KeeperApp. Own backend components, optimize MySQL schemas/queries, ensure performance and reliability, apply secure coding practices, participate in code reviews, and collaborate with product and engineering teams to deliver features iteratively.

Lead design, development, testing, and maintenance of enterprise Java microservices and front-end applications. Build APIs, CI/CD pipelines, and containerized deployments; troubleshoot production, ensure security/compliance, mentor junior developers, and collaborate within Agile teams.

Design, build, and maintain scalable enterprise full-stack applications using Java, Spring Boot, microservices, and modern front-end frameworks. Implement cloud-based solutions on AWS, contribute to CI/CD and DevOps automation, optimize performance and security, and integrate AI-driven capabilities using Python and orchestration tools like LangChain and LangGraph.

Hiring 18 Java developers for three on-site locations (NY, Chicago, Dowingtown PA). Candidates must have 6-8 years Java experience, SCJP certification, and strong skills in Oracle, UML/design, Hibernate, Spring, Servlets, Struts, and front-end technologies (JavaScript/HTML/CSS/AJAX).

Senior developer responsible for design and development of multi-tier applications using Java, C++ and Python. Must have strong object-oriented skills, standalone development experience, domain knowledge in derivatives/fixed income and regulatory reforms (Dodd-Frank), and strong communication with business and testing teams.

Lead and develop enterprise Java applications in a WebSphere environment. Design and build REST/SOAP services, ensure thread-safe concurrency, tune high-volume systems, use J2EE/Spring frameworks and ORMs, work in Agile teams, write automated tests, integrate with MQ and databases, and mentor a small development team.

Develop, support and integrate Vertex tax applications using Java/J2EE. Perform design reviews, deployments, troubleshooting, on-site client support, and 24x7/beeper escalation. Work with Vertex Central components, web services, databases, application/web servers, and integration tools to resolve customer issues and implement packaged n-tier systems.

Develop and maintain Java middleware applications using Spring and Struts. Implement Spring Integration and RESTful services, build web UIs with JavaScript/jQuery/HTML/CSS, perform SQL work with MS SQL/Oracle, participate in design/architecture reviews, SDLC and project lifecycle activities, and work within financial services in a global delivery environment.

Design and develop scalable applications, collaborate in Agile teams, and utilize various technologies like Java, React, and AWS.