Top Java Developer Jobs in Toronto

Senior Java developer working on multi-tier J2EE applications with strong SQL/Oracle 11g skills. Requires WebSphere 7, Jython and KSH/Bash scripting, Linux experience (RHEL preferred), and experience with Mantas or equivalent FCCM systems. Responsible for system build documentation and documenting solution architectures in Visio/PowerPoint.

The Java Integration Developer will work in an Agile environment, focusing on team collaboration, task management, and software integration using Java and related technologies.

Design and develop complex, scalable applications in an Agile team. Collaborate on features, estimate tasks, and maintain clear code.

Design and develop scalable applications in an Agile team, collaborating closely on features while learning and applying new technologies.

Join a cross-functional Agile team to design and develop backend systems and REST APIs. Build low-latency, high-throughput services, apply Core Java, SQL, big-data tools, NoSQL stores, CI and automation testing, and collaborate on product roadmap and system improvements.

Design, develop, modernize, and support Java-based applications and integrations for Prime Brokerage. Optimize SQL and integrations, improve reliability and performance, resolve production incidents, ensure secure coding and compliance, conduct code reviews, and collaborate with stakeholders to deliver scalable enterprise solutions.

Develop and enhance a low-latency, distributed Java-based risk management platform. Integrate with trading systems, design and implement microservices, ensure architectural alignment, mentor junior engineers, and troubleshoot complex system issues.

The role involves developing and maintaining web APIs and backend services using Java and Spring Boot, focusing on microservices and CI/CD in an agile environment.

Own and optimize the Java OLAP cube engine (Atoti/ActivePivot-like), ensuring correctness and low-latency aggregation across large, complex financial models. Collaborate with .NET consumers, define service contracts, profile and tune JVM performance, resolve OLAP-specific defects, and deliver thorough unit and integration tests.

Senior Java developer to build and maintain Java services for Global Regulatory Reporting. Work on large-scale, low-latency systems and big data with bi-temporal support, integrate middleware (Solace, IBM MQ, Apache ActiveMQ), collaborate across teams, and support regulatory/trade reporting in an Agile environment.

Participate in design, development, testing, debugging, and implementation of application systems. Consult with users and teams to define enhancements, troubleshoot issues, recommend solutions, mentor junior analysts, and ensure compliance and risk-aware decision making.

Develop and enhance full-stack Java applications, build server-side Java and modern front-end components, implement Microservices and APIs, troubleshoot and remediate security issues, collaborate with cross-functional teams, and coach junior analysts while ensuring solutions meet performance, risk, and control requirements.

Design, develop, test, and maintain scalable web applications using Java, Spring Boot, and Angular. Build RESTful APIs and microservices, create responsive front-end interfaces, perform unit testing and debugging, participate in code reviews and Agile ceremonies, and optimize performance, security, and reliability.

Senior Java Big Data Developer with 8+ years building applications on Cloudera/Hadoop ecosystems using Spark and MapReduce. Responsible for designing performant Java (1.8+) solutions, data analysis of large datasets, unit testing (JUnit), and collaborating with/managing global technology teams. Preferred skills include Unix/Python scripting and familiarity with Hive, Impala, YARN, and Kafka.

The role involves leading application systems analysis, programming, and managing development teams to implement new systems in coordination with the technology team, while ensuring compliance and best practices.

Senior full-stack developer responsible for end-to-end design, development, testing, and deployment of features on the Citi Velocity platform. Solve complex UI and server-side problems, champion information security, collaborate with users and tech teams, and mentor junior developers in an agile environment.

Lead design and hands-on delivery of low-latency, high-throughput trading platform components. Drive engineering excellence with TDD, CI/CD, observability, secure coding, AI-assisted tooling, and platform modernization while mentoring teams and partnering with product, risk, and operations to meet SLAs and regulatory requirements.

Design, build and maintain Java-based risk and valuation applications. Migrate systems to cloud, create/refactor Spring Boot microservices, integrate REST/gRPC and messaging (Kafka), work with Big Data tools, ensure low-latency scalable performance, collaborate with global stakeholders, mentor teammates, and support CI/CD and automated processes for market risk and trade valuation workflows.

Senior full‑stack developer responsible for designing, developing, and maintaining enterprise‑scale React.js frontends and Java (17+) Spring Boot microservices. Modernize Angular apps to React, build REST APIs and event‑driven pipelines with Kafka, integrate SQL and NoSQL databases, support CI/CD and containerized deployments (Docker, Kubernetes, OpenShift), and monitor production systems using ELK/Grafana.

Design, implement, and maintain Elasticsearch distributed-systems components to ensure scalable, performant, and resilient indexing, coordination, replication, and cluster communication. Diagnose and fix concurrency and performance issues, push scalability limits, and lead projects end-to-end while supporting support engineers and mentoring engineers across multi-node deployments.

Lead development of core Elasticsearch infrastructure and shared platform features. Design scalable APIs, solve performance and concurrency issues, improve observability and CI/CD, support cross-team projects, and own operational investigations end-to-end.

The Senior Java Developer will enhance Elasticsearch's distributed systems, maintain high performance, and solve complex problems related to data indexing and coordination across multiple machines.

Develop and maintain Finance Desk applications (position management, trade capture, risk processing). Own full SDLC: analysis, design, coding, testing, deployment, L3 production support. Improve CI/CD pipelines, collaborate with global teams, coordinate testing and rollouts, and drive secure, maintainable solutions.

Seeking a Senior Engineer with 5+ years in Java, familiar with Spring, microservices, and agile principles to solve client challenges.

Design, build, and maintain scalable, highly available backend services in Java. Own backend architecture, optimize performance, develop APIs and integrations, support production, conduct code reviews, and contribute to AI engineering tools and infrastructure.