Top Senior Java Developer Jobs in NYC, NY

Lead a team modernizing a core Aladdin analytics and reporting service using scalable, API-first Java solutions. Design backend systems, data models, APIs, and integrations; collaborate with engineering, product, business, and clients; and oversee production delivery. Mentor junior engineers, apply AI-native development tools, and solve large-scale data challenges involving client-server systems, inter-process communication, relational and NoSQL databases, distributed caching, and high-performance services.

Senior individual-contributor backend engineer responsible for designing, building, and operating production-grade, highly available, strongly consistent services for wallet operations, transaction orchestration, blockchain integrations, and event-driven workflows. Implement secure, scalable APIs, cryptographic key management, Kafka-based event systems, observability with OpenTelemetry, CI/CD pipelines, and produce tests, API specs, and operational runbooks.

Develop and maintain scalable enterprise Java applications and Spring-based microservices. Responsibilities include hands-on coding, unit and system testing, debugging, technical documentation, performance optimization, troubleshooting distributed cloud environments, and adherence to software development and security standards. Collaborate with technical leads, architects, and cross-functional Agile teams to design and implement complex global applications.

Build and maintain scalable Java backend services for internal platforms, integrating with Salesforce and other distributed systems. Design APIs, data flows, and event-driven architectures; write tested, maintainable code; troubleshoot complex integrations; and improve reliability, observability, performance, and CI/CD practices. Contribute to internal web applications and Salesforce development as needed. Collaborate with engineers, product managers, technical program managers, and business teams in an agile environment. This is a US-based remote role.

Lead and contribute to design, develop, and maintain scalable Java/Spring Boot services on AWS. Drive adoption of enterprise-authorized AI-assisted engineering practices, ensure operational stability and monitoring (Prometheus/Grafana), troubleshoot complex issues, participate in architecture and code review, automate remediation, and mentor/lead software engineers.

Lead backend engineering for cloud-native, multi-cloud fintech products. Design scalable, reliable, and secure systems using domain modeling. Build testable, operable code, resolve production incidents, optimize performance and data access, and enable zero-downtime releases. Mentor teammates, drive technical direction, and continuously modernize technologies and patterns.

Maintain and support Java-based healthcare SaaS applications across multiple customer environments. Responsibilities include bug fixes, feature delivery, refactoring, deployments, security remediation, SQL and data migrations, code reviews, configuration improvements, and production support. The role requires a generalist software engineer comfortable with Java, Angular, SQL, REST APIs, enterprise applications, and customer-facing environments.

Leads the design, development, support, and performance tuning of Java/J2EE web applications and backend systems. Provides technical guidance, mentors developers, interfaces with databases using SQL and PL/SQL, troubleshoots issues, participates in code reviews, and collaborates with business and IT stakeholders. The role spans the full software development lifecycle and may involve microservices, cloud services, CI/CD, automation, and financial data systems.

Leads the design, development, testing, and deployment of scalable Java applications and distributed systems for an indices prototyping platform. Responsibilities include building microservices, using AWS cloud services, implementing containerization, improving performance and reliability, developing user interfaces, fixing defects, maintaining code quality and automation, and mentoring junior engineers.

Develop and maintain secure, scalable Java EE applications supporting NYC’s CITYTIME automated timekeeping system. Responsibilities include full software development lifecycle ownership, requirements collaboration, coding, testing, code reviews, performance optimization, production troubleshooting, technical documentation, and technology evaluation. The role requires Java and JEE expertise, MVC and ORM experience, web services and API development, SQL and relational database knowledge, Agile familiarity, and experience with build and version-control tools. Blaze Advisor rule-engine experience is preferred.

Build and deliver equity derivatives trading applications focused on risk and parameter management. Responsibilities include designing applications using Agile methods, gathering business requirements, collaborating with production support, and delivering hands-on Java server-side development. The role requires extensive financial services and equity derivatives experience, with expertise in Core Java, caching technologies such as GemFire or Coherence, distributed computing, and SQL.

Build and deliver equity derivatives trading applications, including risk and parameter systems, using hands-on server-side Java development. Responsibilities include designing applications in an agile environment, gathering business requirements, supporting production operations, and collaborating with front-office teams. The role requires extensive financial services experience, equity derivatives expertise, strong Core Java skills, distributed computing knowledge, and familiarity with caching and database technologies.

Develop and maintain scalable Java and Spring Boot backend applications, microservices, and RESTful APIs. Responsibilities include database integration, code reviews, performance optimization, production troubleshooting, testing, CI/CD, cloud deployment, and collaboration with product, QA, and DevOps teams.

Develop and maintain scalable Java and Spring Boot backend applications and REST APIs. Optimize CPU, memory, and overall application performance; identify bottlenecks; resolve production issues; and contribute to architecture, code reviews, reliability, and scalability. The role also involves Node.js or Python FastAPI services, cross-functional collaboration, and potential work with GraphQL, generative AI, cloud platforms, containers, CI/CD, and monitoring tools.

Designs, develops, tests, documents, and operates large-scale distributed software products for Allstate’s Enterprise Payments organization. Responsibilities include building Java and Spring Boot REST APIs, designing microservices, collaborating on system architecture, practicing paired programming and test-driven development, establishing CI/CD pipelines, improving performance, securing APIs, supporting production applications, and contributing to Agile planning, retrospectives, and knowledge sharing.

Design, develop, test, and deliver scalable full-stack Java and microservices solutions for critical ETF technology platforms. Partner with product, business, QA, infrastructure, and support teams throughout the software lifecycle. Drive modernization, secure development, automated testing, DevOps delivery, observability, resiliency, and performance improvements. Troubleshoot production issues, perform root cause analysis, support incident resolution, and provide technical guidance while applying AI-assisted development tools responsibly.

Develop and remediate Java backend applications for Oracle database and JDBC driver upgrades. Responsibilities include updating code, dependencies, configurations, and connection settings; troubleshooting connectivity, SQL, transactions, performance, and compatibility issues; conducting testing; validating REST APIs; supporting deployments and production stabilization; and coordinating with DBA, DevOps, QA, infrastructure, security, application, and client teams.

Develop and maintain brokerage platform software across the full lifecycle, including design, coding, implementation, testing, documentation, deployment, debugging, and user requirements gathering. Work may involve Java Swing front-end trading platforms or Core Java back-end data and transport layers requiring multithreading and high throughput. Candidates should understand complex systems, propose solutions, and collaborate effectively with users and the development team.

Develop Java and J2EE business software applications, with a primary focus on designing and supporting SOAP and REST web services. The role requires more than six years of overall Java/J2EE experience, at least four years working with web services, and experience with Oracle SQL. This is a full-time position located in Long Island, New York.

Develop and maintain applications using Java and related technologies, while also working with Angular JS and Node JS frameworks.

The Core Java Developer will build applications in a Web Sphere environment, collaborate in Agile teams, and ensure high performance and security for applications.

Leads the entire application lifecycle, translating requirements into solutions, designing, developing, testing, and implementing technology solutions aimed at improving operations.

Build and enhance Citi's Integrated Digital Assets Platform backend. Collaborate on blockchain-based web applications, deliver functional scope, apply enterprise and web3 design patterns, maintain documentation, support solution engineering, and follow best practices for reliability, scalability, and performance in a distributed Agile team.

Investigate and resolve data-quality issues in large-scale distributed systems. Design Java-based repair pipelines and idempotent correction jobs for high-volume datasets, debug existing code, use AWS services for queue-driven and batch workflows, optimize performance and concurrency, and communicate technical findings and risks to stakeholders.

Lead design, development, testing, deployment and support of cloud-native Java microservices and APIs. Build event-driven data pipelines using Kafka, work with AWS EKS/ECR/EC2/Beanstalk, implement CI/CD and containerization, collaborate in Agile teams, and drive technical alignment and innovation across IB Tech & CRM/Analytics.