Top Java Developer Jobs in Toronto

Design, build, and deploy high-performance asynchronous Java microservices and reactive backend systems. Develop Kafka event-streaming pipelines, Elasticsearch search capabilities, and MongoDB persistence solutions. Lead test-driven development with JUnit, code reviews, coding standards, and engineering quality initiatives. Collaborate with product, infrastructure, and architecture teams to deliver scalable features, while mentoring mid-level engineers and analysts.

Develop and support full-stack Java and Angular applications, participating in feasibility analysis, design, development, testing, implementation, and user support. The role analyzes complex application issues, recommends programming and security solutions, consults with users and technology teams, supports operational standards, assesses risk, and mentors junior analysts. It requires autonomy, stakeholder advising, and experience with Java, Angular, Python, SQL, CI/CD, DevOps, and software systems analysis.

Build and maintain full stack applications, common services, and user interfaces for Citi’s Oracle Ledger Program. Develop Java backend services, Angular or React frontends, REST APIs, and Selenium test automation. Lead software delivery from analysis through implementation, provide advanced L3 production support, resolve complex issues, collaborate with business and technology teams, uphold engineering standards, and mentor developers in a global support model.

Designs, develops, and optimizes high-performance, low-latency Java microservices for an equities electronic trading platform, especially Smart Order Router technology. Responsibilities include routing logic, venue analysis, system architecture, code reviews, testing, deployment improvements, monitoring, reconciliation, recovery, and technical collaboration with product and quantitative teams. The role also addresses complex trading-system challenges while maintaining regulatory compliance and operational risk controls.

Lead the design, development, testing, deployment, and support of enterprise Java applications. Serve as a Java subject matter expert, conduct feasibility and estimation activities, define development standards, improve systems, and ensure security and compliance. Collaborate with business and technology teams, provide technical guidance, and mentor junior developers. The role requires expertise in Java, Spring Boot, cloud-native platforms, distributed systems, databases, messaging, CI/CD, Agile, and software engineering best practices.

Lead the architecture and delivery of mission-critical cloud-native systems using Java, Spring, microservices, event-driven platforms, and distributed system patterns. Build secure, scalable services; establish engineering standards; mentor senior engineers; and guide teams through the full SDLC. Design cloud, data, integration, observability, CI/CD, infrastructure-as-code, and security solutions while partnering with product, platform, SRE, and business stakeholders. Provide technical leadership for architecture reviews, roadmaps, performance, resiliency, compliance, and emerging GenAI patterns.

Develops and supports full-stack applications using Java, Spring Boot, REST APIs, and React or Angular. Responsibilities include application analysis, design, coding, testing, implementation, troubleshooting, performance optimization, security, and user support. The role works with Docker, SQL, CI/CD tools, application servers, automated testing frameworks, and version control. It also advises stakeholders, coaches junior analysts, manages risks and deadlines, and operates with limited supervision.

Build and oversee robust full-stack applications for OTC derivatives within Markets Technology. Responsibilities include participating across the SDLC, reviewing technical solutions, shaping application-development strategies, developing Java-based services and user interfaces, and collaborating with product, business, and support teams. The role requires expertise in microservices, event-driven systems, cloud platforms, distributed systems, testing, clean code, stakeholder management, leadership, and project delivery while maintaining regulatory and risk controls.

Design, develop, and deploy Java and Spring Boot backend applications using MongoDB. Build and integrate AI agents with prompt engineering and Google ADK, support intelligent application features, and contribute to feasibility studies, planning, risk assessment, testing, implementation, security, and operational support. Serve as an application development subject matter expert while managing projects, deadlines, compliance, and stakeholder expectations.

Develop and support scalable full-stack applications for OTC derivatives and markets technology. Responsibilities include feasibility analysis, system design, Java and React development, Spring Boot microservices, testing, implementation, production support, security, risk assessment, and user consultation. The role requires strong software engineering practices, Oracle and PL/SQL expertise, independent judgment, technical leadership, and mentoring of junior analysts.

Design and build Java-based microservices for global reference data platforms. Drive architecture decisions, develop REST APIs and secure cloud-ready applications, establish coding and architecture standards, collaborate with distributed engineering teams, and mentor engineers. The role requires expertise in Java, Spring technologies, databases, messaging, cloud platforms, testing, and secure software development.

Lead architecture and end-to-end delivery of mission-critical, cloud-native distributed systems. Design microservices and event-driven platforms, develop Java and Spring services, establish engineering standards, mentor senior engineers, and guide design reviews. Partner with SRE and platform teams on Kubernetes, CI/CD, infrastructure as code, observability, security, compliance, data integration, and operational excellence. Translate business needs into technical roadmaps and communicate architecture decisions across technical and non-technical stakeholders.

Develop and maintain enterprise full-stack applications using Java Spring Boot, React.js, and TypeScript. Design microservices, RESTful APIs, and MCP services for AI agents; deploy cloud-native solutions using AWS, Kubernetes, OpenShift, Docker, S3, and Oracle. Collaborate with cross-functional teams, conduct systems analysis, ensure secure and maintainable software, support production applications, assess risks, and mentor junior developers.

Leads architecture and development of scalable Java applications for Citi’s regulatory reporting platform. Designs Spring Boot, SQL, microservices, messaging, and big data solutions; establishes engineering standards; resolves complex technical issues; collaborates with architecture, infrastructure, and business teams; mentors engineers; and ensures compliance, data integrity, and regulatory adherence.

Develop and maintain scalable, resilient Java applications for a cloud-native operations workflow and case management platform. Design solutions, write and test code, promote engineering best practices, participate in Scrum ceremonies, and collaborate with product owners, architects, QA, and business stakeholders. The role uses Kubernetes, Docker, Kafka, databases, APIs, security practices, and CI/CD technologies to deliver financial technology solutions.

Design and develop high-performance Java backend services and scalable data-processing architectures using Java 17 and Spring Boot. Build microservices, optimize SQL queries and data pipelines, resolve performance issues, and apply test-driven development, static analysis, and modern architectural patterns. Collaborate with cross-functional teams to deliver business-critical features while using AI-assisted development and prompt engineering to improve delivery and code quality.

Develop and support enterprise Java applications, leading feasibility, design, development, testing, implementation, security, and operational support. The role requires expertise in scalable cloud-native systems, Kubernetes, Docker, Kafka, databases, APIs, application security, and CI/CD. It advises stakeholders, mentors junior analysts, manages risk and deadlines, evaluates business and system processes, and contributes to technology standards and solutions with limited supervision.

Develop server-side applications for Rates trading technology, translating trading desk needs into scalable, high-throughput solutions. Responsibilities include Java development, microservices and API delivery, technical analysis, testing, SDLC improvement, large-scale project delivery, production support, risk and compliance, and collaboration with global business and technology teams.

Design and deliver enterprise reporting APIs and Java-based data pipelines using Spring Boot, Oracle, ETL/ELT workflows, and event-streaming platforms. Responsibilities include API design, application development, testing, deployment, monitoring, security, SQL optimization, data warehousing, user support, risk assessment, and mentoring junior analysts. The role requires independent technical judgment and collaboration with business and technology stakeholders.

Develop and maintain a global Delta One execution platform for ETF trading. Responsibilities include Java architecture and development, requirements analysis, system design, testing, implementation, production support, workflow enhancement, data integration, documentation, and support-team training. The role collaborates with business analysts and development teams in an agile environment, communicates risks and progress, and supports low-latency trading technology across financial markets.

Develop and maintain Java applications and microservices, participating across feasibility, design, development, testing, implementation, and production support. Analyze complex application and business problems, recommend programming and security solutions, collaborate with users and technology teams, and ensure development standards and controls. The role also provides technical guidance to junior analysts and requires independent judgment, risk awareness, and compliance with banking policies.

Design and deliver secure, high-performing Java microservices and REST APIs supporting Citi’s global reference data platforms. Lead architecture decisions, establish coding and security standards, coordinate global engineering teams, and select development tools. The role involves enterprise application development with Spring, relational databases, messaging, cloud platforms, automated testing, and build tools. Preferred experience includes NoSQL, GraphQL, Angular or React, integration frameworks, shell scripting, API gateways, and CI/CD pipelines.

Leads architecture and hands-on development of low-latency, high-throughput risk platforms for global trading desks. Designs distributed Java systems, optimizes multithreaded performance, develops event-driven pipelines with Kafka and Solace, and coordinates integrations with trading, market data, clearing, and regulatory systems. Provides technical leadership, stakeholder advisory, architectural governance, mentorship, and adoption of AI-assisted engineering practices.

Lead development of complex Java and Spring Boot middleware applications, REST APIs, and microservices. Design and optimize Oracle and MongoDB integrations, improve CI/CD pipelines, troubleshoot production systems, mentor engineers, and contribute to technical roadmaps. Apply AI tools such as Devin, Copilot, Claude, Anti Gravity, and Codex for code generation, testing, security analysis, documentation, monitoring, risk assessment, and developer productivity.

Lead the design, development, and implementation of enterprise Java applications. Collaborate across technology teams, define system enhancements, solve complex technical issues, establish coding and testing standards, and ensure scalable, available, secure solutions. Develop APIs and microservices, mentor developers, assess risks, and support deployment using cloud-native technologies. The role requires expertise in Java, Spring, REST, Kafka, databases, testing, containers, CI/CD, and application architecture.