Top Java Developer Jobs in Ottawa

The Java Developer will be responsible for developing web-based applications, using Java and related technologies, while collaborating within the team.

Design, develop, and maintain high-performance, secure Java backend services and APIs. Ensure reliability, scalability, and cost-efficiency across microservices, databases, messaging systems, and capacity planning. Troubleshoot, profile, benchmark, and optimize systems (including ML applications) and collaborate with Kazakhstan stakeholders.

Seeking a Java Back-End Engineer for enterprise applications, requiring strong Java and J2EE experience, RDBMS, and secure coding knowledge.

Senior Java engineer responsible for architecture and delivery of high‑scale, cloud‑native platform capabilities. Lead system design, implement critical Java components, drive observability and deployment practices, apply AI‑assisted engineering, produce architecture docs, mentor/hire, and collaborate cross‑functionally to ensure performance, reliability, and long‑term maintainability.

Design, develop, and maintain Java-based distributed applications for Par Loan Trading. Lead feasibility, design, testing, implementation, and post-implementation support. Mentor junior analysts, recommend security measures, consult with stakeholders, and ensure compliance with policies and risk controls.

Design, build, and maintain frontend interfaces and backend services; modernize legacy Spring MVC/JSP architecture; optimize backend performance and databases; build secure REST APIs; configure automated job scheduling; troubleshoot cross-platform issues to ensure platform reliability and scalability.

The Senior Java Engineer will design complex systems, optimize performance, maintain code quality, and ensure application reliability. Responsibilities include translating requirements into applications and troubleshooting issues.

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.

As a Senior Software Engineer, you will develop high-quality software applications, mentor teams, and drive project deliveries while collaborating with various stakeholders.

Design, develop, and optimize high-performance Java backend systems. Contribute to architecture, implement core modules, troubleshoot production issues, perform code reviews, and improve scalability, availability, and reliability of distributed financial or blockchain systems.

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.

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

We're looking for a Staff Engineer with 5+ years of experience in Java and full-stack development to tackle challenges and lead solutions.

Responsible for designing and developing web applications using Java/Spring/Hibernate, collaborating with stakeholders, and leading platform technology improvements within Citi's Financing and Securitization team.

As a Senior Software Engineer, you will build and maintain data framework integrations for ClickHouse, focusing on high-performance database and developer experience. You will manage full lifecycle integrations, ensuring scalability and reliability for real-time data processing and analytics.

As a Backend Software Engineer, you will enhance detection engines and analysis systems, focusing on scalable distributed systems and analyzing mobile applications' behavior and risks.

The Staff Software Engineer will design, develop, and maintain scalable cloud-based solutions, manage data ingestion and retrieval, and lead architectural innovation while collaborating with cross-functional teams.

Design, develop, test and maintain enterprise Java applications and integrations for a digital permitting platform. Implement microservices, REST/SOAP services, Azure-enabled CI/CD deployments, IBM ODM/BAW integrations, WebSphere/Liberty hosting, PL/SQL data work, AODA-compliant UIs, OpenShift container deployments, and support multi-environment releases in Agile teams.

Design, develop, and implement microservice-based components for a derivatives exchange trading platform. Collaborate with product, security, and DevOps teams to optimize products/models, perform code audits, build automated tests and CI/CD pipelines, troubleshoot backend infrastructure, and manage releases and documentation.

The Java Back-End Developer will build and maintain backend applications, ensuring system reliability, collaborating with teams, conducting code reviews, and mentoring juniors.