Top Java Developer Jobs in Toronto

Lead design and implementation of cloud-native, scalable backend systems for banking using Java/Spring Boot, microservices, APIs and event-driven architectures. Drive modernization to cloud platforms, CI/CD, containerization, Kubernetes, DevSecOps, observability and automated testing. Remain hands-on with coding and architecture, mentor engineers, influence technical strategy, and promote AI-assisted engineering practices.

Design, develop, deploy, and operate secure, scalable backend services. Drive technical initiatives, contribute to architecture, troubleshoot production issues, participate in on-call, and promote observability, CI/CD, and secure engineering practices while mentoring peers.

Senior full‑stack Java developer responsible for designing, building, testing, and deploying React front ends and Spring Boot microservices on cloud platforms (OpenShift/Kubernetes and AWS). Develop RESTful/MCP APIs, integrate with S3 and Oracle, apply CI/CD, mentor junior staff, evaluate new technologies (including generative AI/LLMs), and ensure secure, maintainable enterprise solutions while managing project delivery and risk.

Participate in analysis, design, development, testing, implementation and support of application systems. Provide feasibility studies, estimates, risk assessment, security recommendations, and act as SME/coach. Monitor development lifecycle, consult with users and tech teams, and ensure compliance with policies and controls.

Senior Java engineer responsible for designing, developing, and delivering low-latency exchange connectivity and DMA platforms. Collaborate with global teams, product, QA, and support; improve resiliency and latency; maintain testing frameworks and CI; implement test cases for trading functions; drive Agile, CI, and AI tooling adoption while defining best practices and standards.

The role involves developing and modernizing application systems in Capital Markets and Credit Risk, providing technical leadership, ensuring compliance, and mentoring junior developers.

The Senior Java Developer will lead design and delivery of systems, mentor engineers, and ensure scalable architecture using cloud-native technologies.

Senior Java developer responsible for full lifecycle development, enhancement, and production support of a global equities cash order management platform. Work with trading desks and cross-functional teams to design scalable microservices, improve performance, implement automated integration tests, remediate security/vulnerability issues, and adopt AI toolkits. Mentor mid-level developers and provide second-line and out-of-hours support.

Lead design and development of high-performance, low-latency trading and financial systems using Core Java and Spring. Implement multi-threaded, concurrent, and scalable solutions, tune SQL and caching (MemSQL/Redis), deploy and manage cloud applications (AWS/Azure), collaborate with global teams, perform code reviews, support live trading systems, and drive architecture for distributed capital markets solutions.

Senior individual-contributor responsible for designing, building, and delivering Java backend services (Spring Boot, Hibernate, multithreading, Oracle) for credit risk systems. Sets engineering standards, performs code reviews, mentors developers, architects scalable solutions, collaborates with business and tech teams, and ensures regulatory and data-protection requirements are met.

The Lead Full Stack Java Developer oversees application systems analysis and programming, leads development teams, and ensures integration of business functions.

The Senior Java Engineer will design and develop middleware services, ensure project delivery, analyze systems for performance, and contribute to code reviews while adhering to engineering standards.

Seeking a Senior Java Developer to engage in Agile Scrum processes, collaborate with teams, and develop solutions using Java and SQL. The role requires delivering quality software through effective communication and continuous learning.

As a Senior Java Developer, you will develop web applications using Java and Spring Boot, participate in code reviews, testing, and research new technologies.

As a Full Stack Java Developer, you will work on web application development using Java and Spring Boot, contributing to high-quality software projects.

We are seeking a Senior Java Developer to design and develop web applications and cloud services, enhance developer productivity, and lead improvements in platform technology solutions.

The role involves developing applications, conducting feasibility studies, providing user support, risk assessment, and following agile methodology. Requires Java expertise and managing projects.

Lead hands-on design and development of secure, scalable payment API and event-driven cloud services on AWS. Collaborate with product, QA, architecture, and support teams to deliver production-ready, observable solutions, and promote AI-assisted engineering productivity.

Senior Backend Developer building and maintaining enterprise-scale cloud backend applications in Java and Go. Design, develop, integrate, containerize (Docker), and deploy services on Kubernetes/OpenShift and Azure, collaborate with cross-functional teams, act as SME, and ensure secure, scalable APIs and database integrations.

Design, develop, and maintain Java/J2EE applications. Analyze existing programs, implement features using Servlets/JSP/JSF/Spring/EJB, build web services, perform unit/integration testing, optimize performance, manage CI environments, and provide development guidance.

Develop and maintain Java/J2EE applications and web services (REST/SOAP); work with Oracle/SQL Server databases; deploy on WebSphere; collaborate in an Agile team within banking/financial services; communicate with stakeholders.

Design, build, and optimize low-latency, high-throughput Java microservices and REST APIs for payments. Deploy and scale services on OpenShift/Kubernetes and AWS, integrate with MongoDB and other datastores, drive architecture and performance improvements, and mentor peers.

Perform quality engineering and software testing for core Java and mainframe systems. Design and execute test scenarios using Selenium, Cucumber, and REST Assured; perform mainframe testing (JCL, Copybook, IMS, DB2); track defects in Jira/JTMF; work within SDLC/STLC and Agile processes.

Lead backend application design and development, solve complex system problems, define coding/testing standards, integrate systems, coach mid-level developers, and drive compliance while partnering with management on product and process enhancements.

The role involves designing, developing, and maintaining software applications, ensuring system performance and reliability, and providing support to users. Responsibilities include adoption of best practices in development, security measures, and compliance with architecture standards.