Top Senior Java Engineer Jobs in NYC, NY

Design, develop, deploy, and maintain secure, scalable Java and Spring Boot services for a multi-tenant ecommerce SaaS platform. Build REST APIs, optimize MySQL data access, operate AWS workloads, and support CI/CD, observability, testing, and production troubleshooting. Contribute to architecture and technical decisions, mentor engineers, use AI-assisted development tools responsibly, and help maintain PCI DSS compliance.

Leads full-stack engineering and AI modernization initiatives, designing scalable enterprise applications and architecture. Responsibilities include coding, testing, technical discovery, application modernization, security and privacy integration, engineering standards, mentoring, stakeholder consulting, and strategic technology leadership. The role requires collaboration across product, operations, data, and security teams while balancing innovation, platform stability, and delivery commitments.

Evaluate AI coding agents such as Codex, Claude Code, and Cursor for reasoning quality, engineering judgment, explanations, and usefulness. Provide detailed written and recorded feedback, distinguish response quality levels, and help define standards for effective AI-assisted development workflows. This remote contract requires 10–20 hours weekly, with ongoing projects lasting two weeks to several months.

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.

Build enterprise workforce management software for forecasting, staffing, scheduling, adherence, intraday management, and operational reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven workflows, PostgreSQL data models, integrations, and cloud-native deployments. Support CI/CD, production troubleshooting, performance optimization, architecture discussions, code reviews, and stakeholder collaboration across product, QA, DevOps, UX, and operations.

Lead design and delivery of scalable, resilient distributed systems. Act as technical authority across teams, mentor engineers, drive architecture and CI/CD best practices, troubleshoot production issues, optimize performance, and enhance observability while writing production-grade Java.

Develop and operate low-latency Java connectivity platforms for equities electronic trading, including exchange and client connectivity, order management, algorithmic access, and direct market access. The role involves performance optimization, concurrency, high-throughput architecture, automated testing, monitoring, reconciliation, application recovery, stakeholder collaboration, project execution, and mentoring junior engineers.

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

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

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.

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.

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.

Senior Java developer responsible for designing, implementing and testing Java/J2EE web applications. Work with Spring, Hibernate, JMS, web frameworks (Struts/JSF), frontend technologies (Angular, Bootstrap), relational databases (Oracle/SQL Server/MySQL), CI/build tools (Maven/Ant), testing tools, and application servers. Participate in Agile ceremonies, estimations, design sessions, and full SDLC activities.

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.

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 reverse-engineering of TIBCO BW/MFT processes, document business rules, and reimplement them as modular Java/Spring Boot microservices. Migrate protocols to Kafka/RabbitMQ/REST, ensure data consistency, and perform performance testing to match legacy SLAs.

Design and build Java/J2EE solutions using Spring and APIs; develop webservices, DB schemas, PL/SQL and transactional SQL in DB2/Oracle; collaborate with architects, developers and DevOps to implement CI/CD (Jenkins, uDeploy), ensure code quality (Sonar), perform code reviews and testing, resolve technical roadblocks, and drive process improvements. Requires strong communication and teamwork.

The role involves improving Elasticsearch's distributed components, maintaining cluster coordination systems, and addressing complex issues to optimize performance and scalability.

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.

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.