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Added 17 days ago
Java Developer
Triunity Software, Inc.
Toronto, ON
Full-time
Should have hands-on experience on Spring Boot, Spring Data/JPA
Added 17 days ago
JAVA TECHNICAL LEAD L1
Wipro
Toronto, ON
Full-time
Added 17 days ago
Junior Java Developer
mthree
Halifax, NS
$61,000 to $67,000 CAD / year
Full-time
Want to start your career as a Java Developer?
Added 17 days ago
Intermediate Backend Developer (Integration)
Robertson & Company Ltd.
Toronto, ON
Contract
RESTful API / microservices backend development in Java / Spring Boot (Maven-based, deployed to Azure/AKS)
Added 17 days ago
Back End Java
Open Systems Technologies
Mississauga, ON
Contract
We are seeking a highly skilled and passionate Senior Java Backend Developer to join our engineering team as a Senior Individual Contributor. In this role, you will be responsible for…
Added 12 days ago
Software Engineer
Providius
Hamilton, ON
Full-time
Backend: Java (Spring Boot), Python, Some components in C and C++
Added 13 days ago
Software Developer I - 4 Month Co-op/Internship (Winter 2027)
Intact FC
Toronto, ON
Full-time
Nice to have: Spring Boot, Experience Building Rest Services, API Scraping, MongoDB, AWS
Added 11 days ago
Développeur logiciel I - 4 mois Coop/Stagiaire (Hiver 2027)
Intact FC
Montreal, QC
Full-time
Technical skills required: Java, Spring Boot, Maven, REST & SOAP APIs, Jenkins, Git/GitHub, OpenShift, Oracle Database
Added 18 days ago
Specialist Developer-Java
CPKC
Calgary, AB
Full-time
Minimum 6 years of Java application development experience, including extensive expertise with Spring Framework technologies such as Spring Boot, Spring Security, Spring Batch, Spring MVC,…
Added 13 days ago
Senior Java Developer – Vice President
Citi
Mississauga, ON
Full-time
Design and develop enterprise shared services using Java, Spring Boot, and MongoDB, ensuring solutions meet performance, reliability, and scalability requirements in high-transactional…
Added 16 days ago
Sr Software Developer
Royal Bank of Canada
Toronto, ON
Full-time
Design, develop, test, and troubleshoot high-performance Java/Spring Boot applications for data ingestion, processing, and delivery across the trading data lifecycle
Added 15 days ago
Senior Data Engineer - Halifax
Royal Bank of Canada
NS · BEDFORD, Nova Scotia
Full-time
2+ years of application development experience in Java and Spring Framework
Added 1 month ago
Senior Java Developer, Applications Development – Assistant Vice President
Citi
Mississauga, ON
Full-time
Expert-level command of Java, RESTful API design, and cloud engineering principles, with hands-on experience building production-grade services using Spring and Spring Boot.
Added 15 days ago
Senior Java Developer with AI Experience
ELITS
Montreal, QC
Full-time
This is a product development role focused on a live software platform. You will combine strong Java and Spring Boot development with technical guidance for a junior and intermediate team,…
Added 20 days ago
Senior Software Developer – Full Stack
Joblinxsapp
Toronto, ON
Full-time
We are seeking an experienced Senior Full Stack Software Developer to join a dynamic Agile delivery team supporting the design, development, enhancement, testing, deployment, and…
Added 21 days ago
Full Stack Developer, AI
RBC
Toronto, ON
Full-time
Develop and maintain full-stack solutions across a diverse tech stack (Java, Python, Node.js, Angular, Spring Boot), contributing to both front-end and back-end features while continuously…
Added 21 days ago
Senior Data Engineer - Halifax
RBC
Bedford, QC
Full-time
2+ years of application development experience in Java and Spring Framework
Added 21 days ago
Sr Software Developer
RBC
Toronto, ON
Full-time
Design, develop, test, and troubleshoot high-performance Java/Spring Boot applications for data ingestion, processing, and delivery across the trading data lifecycle
Added 19 days ago
Lead Software Developer - Java
RBC
Toronto, ON
Full-time
This Senior Developer/Business Analyst role within Quantitative and Technology Services (QTS), consists of developing, improving and supporting strategic applications within the RAMPP…
Added 21 days ago
Developer Lead (AI-Enabled Systems)
BMO
Toronto, ON · FCP
Full-time
Build robust microservices and APIs using Java, Node.js, or Python
Added 18 days ago
Spring Boot Senior Technical Lead
W3Global
Montreal, QC
$60 to $65 CAD / hour
Contract
Design, develop, and maintain scalable applications using Java, JavaScript, and Spring Boot frameworks.
Added 17 days ago
Sr. Software Engineer
eBay
Toronto, ON
Full-time
5+ years of experience with Java, GraphQL, Spring/Springboot, REST APIs, messaging systems and/or or other backend programming languages.
Added 17 days ago
Staff Software Engineer - MTS 2
eBay
Toronto, ON
Full-time
Added 18 days ago
Back End Developer
Pacer Group
Kitchener, ON
$45 to $50 CAD / hour
Contract
Hands-on experience with Java, Spring Boot, Spring Security, and Node.js.
Added 18 days ago
Integration Developer
PLATO
Canada
Contract
Design and implement enterprise integration solutions using Apache Camel (Camel K, Camel Quarkus, or Camel Spring Boot) and established Enterprise Integration Patterns (EIP).

Open Systems Technologies

Back End Java

Mississauga, ON, Canada

Job type: Contract
Apply by: Oct 3, 2026
Experience: Experience: 8+ years of professional experience in application development or systems analysis, with a heavy emphasis on Java-based backend architectures.
Posting language: English
Posted: Sep 3, 2026

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Original job description

Position Overview

We are seeking a highly skilled and passionate Senior Java Backend Developer to join our engineering team as a Senior Individual Contributor. In this role, you will be responsible for designing, building, and optimizing high-performance, robust, and scalable backend applications specialized in batch and real-time data processing.

As a senior technical leader with a strong programming background, you will drive the architecture and implementation of complex distributed systems. You will play a crucial role in analyzing system requirements, designing data flows, and ensuring clean, maintainable, and highly efficient code. This role demands deep technical expertise in Core Java, concurrency, memory management, and modern distributed data frameworks, without the burden of people management responsibilities.

Key Responsibilities

Systems Analysis & Architecture: Analyze complex business requirements and translate them into highly scalable, reliable, and secure backend systems designs. Evaluate trade-offs between different data architecture patterns (e.g., microservices vs. event-driven).

Hands-on Programming: Write high-quality, production-ready, and performant Java code. Leverage advanced software engineering principles such as Object-Oriented Programming (OOP), SOLID design principles, and design patterns.

Technical Project Delivery: Lead the technical implementation and delivery of critical, complex backend and data-processing initiatives. Partner with cross-functional teams to ensure successful project deployment from conception through production.

Subject Matter Expertise (SME): Act as the resident Subject Matter Expert (SME) in high-throughput data processing, stream processing, or JVM performance tuning. Provide guidance on industry best practices and emerging backend technologies.

Performance Optimization: Diagnose, profile, and resolve complex performance bottlenecks, memory leaks, and concurrency issues in high-volume distributed environments.

Quality Assurance & Best Practices: Champion code quality through Test-Driven Development (TDD), comprehensive unit/integration testing, and rigid code review standards.

Mentorship: Provide technical mentorship and architectural guidance to other engineers on the team, fostering a culture of technical excellence and clean code.

Technical Skills & Qualifications

Required Qualifications:

Experience: 8+ years of professional experience in application development or systems analysis, with a heavy emphasis on Java-based backend architectures.

Core Java Mastery: Deep, expert-level understanding of Core Java (Java 11/17/21), including advanced multithreading, concurrency models, Java memory model (JVM garbage collection, heap analysis), and Collections API.

Data Processing & Streaming: Extensive hands-on experience building distributed data processing systems, ETL pipelines, and real-time streaming architectures using tools like Apache Kafka, Apache Spark, Flink, or Hadoop.

Framework Expertise: Strong experience with the Spring Ecosystem (Spring Boot, Spring Cloud, Spring Data, Spring Security) and ORM frameworks (Hibernate/JPA).

Database Management: Proficiency in designing schemas and writing optimized queries for both relational databases (e.g., PostgreSQL, MySQL, Oracle) and NoSQL stores (e.g., Cassandra, MongoDB, Redis).

Distributed Systems: Comprehensive understanding of distributed system design patterns, consensus protocols, caching strategies, and API design (RESTful APIs, gRPC).

CI/CD & DevOps: Practical experience with containerization (Docker, Kubernetes), continuous integration/continuous deployment tools (Jenkins, GitLab CI, or GitHub Actions), and infrastructure-as-code principles.

Testing: Strong advocate for testing frameworks such as JUnit, Mockito, and integration testing tools.

Preferred Qualifications:

Experience with cloud platforms (AWS, Azure, or GCP), specifically managed database and container services.

Experience in financial services, banking technology, or large-scale enterprise transaction systems.

Familiarity with Unix/Linux environments, shell scripting, and network configurations.

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More about this job

Responsibilities

Design and optimize high-performance backend applications specializing in batch and real-time data processing. Lead the architecture of complex distributed systems while ensuring clean, maintainable, and efficient code.

Requirements

Requires 8+ years of professional experience with expert-level mastery of Core Java and distributed data frameworks like Kafka or Spark. Proficiency in the Spring ecosystem, database management, and CI/CD tools is essential.

Skills

Core Java
Spring Boot
Apache Kafka
Apache Spark
Distributed Systems
JVM Performance Tuning
Multithreading
Microservices
RESTful APIs
Docker
Kubernetes
PostgreSQL
NoSQL
TDD
Hibernate
gRPC

Visa sponsorship

Not detected in the job text

Keywords

Java 11
Java 17
Java 21
Spring Cloud
Spring Data
Spring Security
JPA
Cassandra
MongoDB
Redis
Flink
Hadoop
JUnit
Mockito
GitLab CI
GitHub Actions
Jenkins
AWS
Azure
GCP
OOP
SOLID
ETL
Event-driven Architecture
Memory Management
Garbage Collection
Heap Analysis
Linux
Shell Scripting

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