Top Java Developer Jobs in Toronto

Develop and maintain enterprise-scale, cloud-based back-end applications using Java and GoLang. Design, integrate, test, debug, and implement cross-platform systems involving APIs, microservices, databases, containerization, and Azure services. Collaborate with developers, business analysts, end users, and technical teams to gather requirements and prepare designs. Serve as a subject matter expert while supporting digital transformation initiatives and mentoring other developers.

Design, develop, test, deploy, and support enterprise full-stack applications. Build React interfaces, Java and Spring Boot back-end services, APIs, microservices, databases, and cloud deployments. Contribute to CI/CD, automated testing, security, troubleshooting, technical documentation, and solution design while collaborating with product, architecture, QA, DevOps, and business stakeholders.

Design, develop, test, debug, and implement Java applications and middleware services using enterprise frameworks and technologies. Lead systems analysis, architecture, documentation, integration, and client application implementation. Support change management, requirements definition, application monitoring, and administration. Migrate applications and data from AS/400 systems while diagnosing complex software issues and developing test procedures and platforms.

Designs, develops, tests, and deploys P&L solutions for FX cash and derivatives products. Collaborates with FX technology teams and business users across sales, trading, controllers, and operations to clarify requirements and deliver solutions. Requires strong Java development, object-oriented programming, multithreading, algorithms, data modeling, database design, performance tuning, and XML skills, with knowledge of FX trading systems and DB2 or Sybase preferred.

Design, build, test, and deliver backend services across the full development lifecycle. Make architecture decisions, write high-quality Java and Spring Boot code, use AI tools, review code, mentor engineers, document decisions, and own problems through resolution. The role emphasizes distributed systems, adaptability, engineering excellence, and potential architecture-level ownership.

Lead the end-to-end development of scalable enterprise applications using Java, Spring Boot, cloud platforms, databases, and messaging technologies. Provide technical leadership, architecture guidance, feasibility estimates, security and compliance oversight, application support, and process improvements. Mentor junior developers and collaborate with business users, product owners, and technology teams. Build and maintain production-grade software using clean code, design patterns, TDD, Agile practices, and CI/CD pipelines.

Leads the design, development, testing, deployment, and support of enterprise Java applications. Provides technical leadership, feasibility estimates, architectural guidance, security and compliance recommendations, and process improvements. Develops Spring Boot services using cloud-native platforms, databases, messaging technologies, and CI/CD pipelines. Mentors developers, collaborates with business and technology teams, and ensures delivery of scalable, maintainable solutions.

Design and deliver secure, scalable Java microservices for Citi’s global reference data platform. Responsibilities include shaping architecture, developing REST APIs, deploying production solutions, partnering with distributed engineering teams, promoting coding and security standards, and mentoring engineers. The role requires expertise in Java, Spring, databases, messaging, cloud platforms, testing, and build tools, with beneficial experience in NoSQL, GraphQL, frontend frameworks, integration tools, API gateways, CI/CD, and Unix/Linux scripting.

Lead development of Citi’s high-performance distributed calculation platform, processing hundreds of millions of daily risk and suitability calculations. Responsibilities include designing Java software, solving distributed computing challenges, improving CI/CD and testing, building customer-facing REST APIs, supporting cloud-native infrastructure, mentoring engineers, and optimizing large-scale workloads with customers. The role operates in a hybrid model with three office days and two remote days weekly.

Build and maintain scalable backend applications and REST APIs using Java and/or Python. Integrate AI-powered workflows, automation, and LLM capabilities into enterprise financial services applications. Develop system integrations, manage technical deliverables from design through implementation, collaborate with business and technology stakeholders, and maintain code quality while adapting to evolving technical environments.

Lead development of Citi’s distributed calculation platform, building high-performance Java software that processes hundreds of millions of daily calculations. Responsibilities include designing platform features, solving distributed computing challenges, improving CI/CD and testing, developing customer APIs, mentoring engineers, and optimizing cloud-based microservice workloads. The role requires expertise in Java, distributed systems, DevOps, cloud platforms, containerization, REST APIs, automated testing, and Agile development.

Leads development of complex full-stack Java applications, microservices, reporting pipelines, and distributed database integrations. Establishes architecture, coding, testing, CI/CD, performance, security, and observability standards while providing hands-on technical leadership. Manages an agile team, sprint delivery, production support, incident resolution, and stakeholder collaboration. Builds modern interfaces with Angular and React, integrates Oracle and MongoDB, mentors engineers, and ensures compliance, reliability, and timely releases.

Develop and maintain Java-based UI and API automation frameworks using Selenium and Playwright for a front-office trading platform. Apply AI and LLM techniques to test generation, synthetic data, self-healing automation, requirements analysis, and defect triage. Define test plans, perform root-cause analysis, manage retesting, report delivery health, troubleshoot infrastructure environments, mentor team members, and collaborate with global QA, development, and product teams.

Leads an applications development team responsible for designing, implementing, and maintaining software systems. Oversees technical issue escalation, system analysis, application programming, project execution, resource planning, compliance, and risk management. Provides technical direction and coaching to developers while making decisions across backend and UI technologies. The role requires strong Java or modern UI development expertise, software engineering leadership, database knowledge, CI/CD experience, and familiarity with messaging, observability, cloud, and containerization technologies.

Develop and support enterprise Java applications throughout analysis, design, development, testing, implementation, and maintenance. Evaluate complex technical and business-process issues, recommend programming and security solutions, collaborate with users and technology teams, manage risks and deadlines, and provide operational support. The role also establishes development standards, advises stakeholders, and coaches junior analysts while working with limited supervision.

Develop and enhance Java-based market risk and valuation applications for derivatives and capital markets. Responsibilities include designing software, building microservices, migrating applications to cloud environments, refactoring legacy systems, integrating APIs and messaging technologies, improving batch and intraday processing, leading software components, and mentoring team members on engineering best practices.

Develop and support enterprise Java applications throughout analysis, design, development, testing, implementation, and post-production support. The role involves building revised systems, analyzing complex technical and business problems, recommending secure solutions, collaborating with users and technology teams, advising junior analysts, managing risks and compliance, and serving as a subject matter expert with limited supervision.

Design and maintain Java-based UI and API automation frameworks using Selenium and Playwright for an investment banking trading platform. Apply AI and LLM techniques to generate tests and synthetic data, enable self-healing automation, analyze requirements, and triage failures. Define test plans, perform root-cause analysis, manage defect retesting, support CI/CD and infrastructure troubleshooting, produce test reports, review runbooks, mentor teammates, and collaborate with global QA, development, and product teams.

Design, develop, test, deploy, and support enterprise full-stack applications using Java, Spring Boot, React, Node.js, Python, and SQL. Build APIs, microservices, databases, and cloud-native solutions while supporting CI/CD, automated testing, security, troubleshooting, and documentation. Collaborate with product, architecture, QA, DevOps, and business teams to deliver scalable and maintainable digital solutions.

Lead the design and delivery of Java and Spring Boot microservices for core banking systems. Build secure, scalable, cloud-native APIs and event-driven workflows while integrating LLMs, RAG, vector databases, and agentic automation. Develop and test production services, define security, caching, and observability strategies, contribute to architecture decisions, and promote AI-assisted engineering practices across development teams.

Lead the design and development of Java and Spring Boot microservices for a major banking client. Build secure, scalable, event-driven, cloud-native systems integrating LLMs, RAG, vector databases, and agentic workflows. Implement architect-designed solutions, develop APIs, manage application security, and establish caching and observability strategies. Promote AI-assisted engineering and GitHub Copilot adoption while contributing to design reviews, technology selection, governance, and developer mentorship.

Lead the design and delivery of Java and Spring Boot microservices for core banking systems. Build secure, scalable, event-driven, cloud-native services integrating LLMs, RAG, vector databases, and agentic workflows. Implement architect-designed solutions, develop APIs, manage security and observability, and support CI/CD deployments. Promote AI-assisted engineering, prompt engineering, and GitHub Copilot adoption while contributing to design reviews, technology selection, and developer mentoring.

Leads the design and delivery of Java and Spring Boot microservices for banking applications. Builds scalable, secure, cloud-native systems incorporating LLMs, RAG, vector databases, agentic workflows, Kafka, and AI-assisted engineering. Responsibilities include API development, application security, containerized deployments, CI/CD, observability, caching, design reviews, technology selection, prompt engineering, and mentoring developers in AI adoption.

Lead the design and delivery of Java and Spring Boot microservices for core banking systems. Build secure, scalable, cloud-native services integrating LLMs, RAG, vector databases, agentic workflows, Kafka, and AI-assisted engineering practices. Implement architect-designed solutions, establish API and security patterns, contribute to design reviews and technology selection, and promote prompt engineering and GitHub Copilot adoption across development teams.

Design, develop, test, deploy, and support enterprise full-stack applications using Java, Spring Boot, React, Node.js, Python, SQL, APIs, microservices, and cloud platforms. Responsibilities include building accessible interfaces, managing databases, supporting CI/CD and cloud deployments, troubleshooting across the technology stack, ensuring security and code quality, collaborating with cross-functional stakeholders, and documenting technical solutions. The role is hybrid, requiring two days weekly in a Toronto office.