Top Java Developer Jobs in Ottawa

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.

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.

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

Design, build, and maintain efficient, reusable Java backend systems; translate business requirements into applications; optimize performance and stability; review and test code for quality and security; identify and fix bottlenecks and bugs; maintain code quality and system responsiveness.

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, and maintain scalable Java backend services using Spring/Spring Boot and microservices. Participate across the full SDLC, implement TDD and CI/CD practices, deploy and manage software, work in Agile/Scrum, mentor engineers, and provide hands-on problem solving to meet deadlines and business 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.

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.

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.

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.

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.

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.

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

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

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