Top Senior Java Engineer Jobs in NYC, NY

Lead development of scalable Java backend applications and high-availability cloud services. Design architectures, REST APIs, databases, caching systems, and distributed session infrastructure. Mentor engineers, drive technical initiatives, address performance and scalability challenges, and uphold quality and automation practices for endpoint management products.

In this role, you will lead the development of Python-based AI applications, optimizing data ingestion, collaborating with business stakeholders, and mentoring developers.

Architect, develop, and maintain highly concurrent, resilient, low-latency Java backend systems for Citi’s FX eCommerce trading platform. Partner with product and technology teams, define system enhancements, ensure architectural alignment, establish coding and testing standards, analyze complex technical problems, and support new product delivery. Advise and coach mid-level developers while managing risk, compliance, and project priorities.

Design, develop, debug, and operate Java applications, libraries, and distributed systems for capital markets technology. Responsibilities include writing efficient documented code, evolving messaging protocols, testing and benchmarking systems, conducting code reviews, troubleshooting performance issues, and collaborating through pairing and Agile development practices.

Develops, enhances, tests, and maintains enterprise Java applications and RESTful web services. Responsibilities include modernizing legacy systems, building Java EE/JEE applications, implementing authentication and authorization, optimizing PostgreSQL databases, supporting AWS environments and CI/CD pipelines, applying security and accessibility standards, and translating business requirements into application features. Collaborates with technical teams and stakeholders in a remote work environment.

Develop core infrastructure and horizontally scalable APIs for Elasticsearch. Solve complex performance, concurrency, stability, and operational issues; improve observability and developer productivity through automation and AI-enabled workflows. Lead cross-team projects, design APIs, support difficult customer issues, and own investigations through resolution. Collaborate across distributed engineering teams while contributing to open-source projects and maintaining secure, performant, and reliable platform functionality.

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, document, and maintain high-performance Java trading and brokerage systems. Build backend services integrating REST, WebSockets, and FIX; troubleshoot complex issues; provide escalated support; collaborate across product and engineering teams; and deliver reliable, low-latency features within a mature codebase.

Develops and owns scalable personalization software on GCP using Java and Python. Designs cloud-native, microservices, batch, real-time data processing, and distributed systems; writes code and tests, performs architecture and code reviews, supports application availability, and collaborates with product owners. Drives agile engineering practices, technical planning, continuous improvement, innovation, and mentorship across enterprise platforms.

Build and maintain scalable Java backend services and APIs for internal platforms. Integrate services with Salesforce and other systems, contribute to internal web applications, troubleshoot distributed systems, and ensure strong testing, observability, resilience, and CI/CD practices. Collaborate with product, technical program management, and business teams to deliver reliable tools supporting operations, marketing, support, risk, and data functions.

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. Optimize performance, concurrency, throughput, testing, monitoring, reconciliation, and application recovery. Partner with business, product, quantitative research, infrastructure, and support teams; resolve complex technology problems; manage projects; mentor junior engineers; and promote engineering best practices and production resilience.

Lead full‑stack development for hedge fund technology: gather requirements, design and implement Java/Python/React applications, support AWS/Terraform infrastructure and RDS databases, drive AI‑assisted engineering practices, mentor engineers, integrate third‑party vendor systems, and ensure secure, scalable, test‑driven delivery.

Lead software engineering for secure, scalable, production-grade applications in an agile enterprise environment. Design complex solutions and architecture, develop Java microservices and REST APIs, improve reliability through automated testing and CI/CD, analyze system data, and build reusable components. Guide responsible adoption of AI-assisted engineering tools, coach team members on secure validation practices, troubleshoot complex issues, and deliver high-throughput distributed systems across cloud-native platforms.

Design, build, and maintain highly available, performant data systems that record and process billions of market events daily. Drive architecture, support APIs and analytics, automate monitoring/alerting, generate reports, and collaborate with stakeholders to deliver scalable, reliable solutions for FX and UST trading data.

Lead full-stack development and modernization of cloud-based investment platforms supporting portfolio management and trading. Design secure APIs, user interfaces, AWS infrastructure, and CI/CD pipelines; oversee production operations, testing, releases, documentation, and code reviews. Partner with business teams, vendors, and global stakeholders to define solutions, troubleshoot issues, and improve reliability. Provide technical leadership, mentorship, governance, security assessments, and root-cause analysis across development teams and investment technology systems.

Leads full-stack development and modernization of cloud-based investment technology platforms. Designs APIs, user interfaces, AWS infrastructure, integrations, CI/CD pipelines, and production support processes. Oversees code reviews, testing, security, documentation, root-cause analysis, and operational improvements. Partners with investment, product, operations, vendors, and technology stakeholders to define requirements and deliver scalable solutions. Provides technical leadership, mentorship, governance, and delivery oversight across employees, contractors, and vendor teams.

Build enterprise workforce management software for forecasting, capacity planning, scheduling, adherence, intraday management, and operational reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven integrations, and PostgreSQL data models. Support cloud-native deployments, CI/CD, testing, performance optimization, production troubleshooting, and technical design. Integrate WFM capabilities with CX, ACD, HR, payroll, identity, and data platforms while collaborating with cross-functional and client stakeholders.

Leads full-stack Java engineering and enterprise application modernization for BNY’s Data Solutions & Services team. Responsibilities include designing scalable applications, implementing AI-powered solutions with LLMs and vector databases, establishing engineering standards, leading technical discovery and architecture, developing automated tests, improving platform performance, mentoring engineers, and advising technology leadership. The role requires collaboration across product, operations, data, and security teams while balancing innovation with reliable delivery.

Lead development and delivery of pricing and yield-curve systems for fixed-income and repo products. Integrate live market and futures data, standardize curve risk buckets, implement consistent pricing via pricers and curve builders, roll out Fast Pricer APIs, and collaborate with traders, quants, and technology teams to ensure accurate risk and P&L in a real-time Java graph framework.

Design, build, and optimize high-performance, low-latency Java services and protocols for exchange and matching-engine systems. The role includes modeling orders and accounts, developing automated testing and benchmarking strategies, profiling performance, diagnosing production issues, collaborating with clients and internal engineering teams, and supporting deployments. After six months, the engineer will independently own technical workstreams through production readiness while delivering observable, maintainable systems and communicating technical trade-offs effectively.

Build enterprise workforce management software for forecasting, capacity planning, scheduling, adherence, intraday management, and reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven workflows, integrations, and PostgreSQL data models. Support cloud-native deployments, CI/CD, testing, performance optimization, production troubleshooting, and technical design. Collaborate with product, operations research, QA, DevOps, UX, and client stakeholders.

Develop and maintain Java applications, RESTful services, and Angular frontends using Spring Boot and NgRx. Deploy applications to cloud platforms, practice TDD, manage CI/CD with Jenkins, and work with Oracle and PostgreSQL databases. Participate in agile processes, collaborate with cross-functional teams, mentor engineers, and independently lead technical initiatives and feature delivery.

Hands-on senior engineer responsible for designing, building, and operating a multi-threaded, Linux-based, real-time Java platform for Equity Swaps. Drive architecture, mentor engineers, own core components (including cashflow calculator), operate and tune sharded MongoDB, improve CI/CD and test automation, lead L3 support, and use AI tooling to accelerate the SDLC.

Design and build scalable media platform systems for uploading, processing, managing, and serving image, video, and audio assets. Own complex backend projects, develop reliable distributed systems and REST APIs, integrate cloud services and GenAI technologies, collaborate across engineering teams, mentor teammates, and participate in production on-call rotations.

Develop and maintain Java-based applications, integrations, workflows, and services supporting an Oracle Identity Manager IAM platform. Responsibilities include troubleshooting production issues, performing root cause analysis, developing SOAP and REST integrations, configuring connectors, supporting Oracle SOA workflows, assisting with upgrades and modernization, and maintaining security and change-management documentation. The role collaborates with government stakeholders and requires the ability to obtain an IT-II security clearance.