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Added 19 days ago
Solution Architect – Enterprise Architecture | Cyber Security | Cloud | AWS | Azure | GCP
Astra-North Infoteck Inc. ~ Conquering today’s challenges, achieving tomorrow’s vision!
Toronto, ON
Full-time
Proven ability to deal with complexity and ambiguity, and demonstrated capability to lead/manage cross-functional partnerships.
Added 13 days ago
Senior Manager QE
RBC
Toronto, ON
Full-time
…breadth of Windows, Linux and Cloud environments, Python / Java, Big data/Hadoop and ML platforms. Leads and hands on in the quality control and QE testing of cross-functional,…
Added 13 days ago
Senior Manager QE
RBC
Toronto, ON
Full-time
…breadth of Windows, Linux and Cloud environments, Python / Java, Big data/Hadoop and ML platforms. Leads and hands on in the quality control and QE testing of cross-functional,…
Added 13 days ago
Technical Lead, Reporting Platform
TD
Toronto, ON
Full-time
Position Title: Technical Lead, Reporting Platform
Added 17 days ago
Lead IAM Quality Assurance Engineer
EPAM Systems
Canada
Full-time
The Lead IAM Quality Assurance Engineer is responsible for ensuring the quality, security, and compliance of Identity and Access Management (IAM) solutions across enterprise applications…
Added 17 days ago
Lead Java Developer
EPAM Systems
Canada
Full-time
We are looking for a hands-on Lead Java Developer with 12+ years of experience to drive the backend architecture and development of a key Dynamic Portfolios platform for a leading Wealth…
Added 13 days ago
IS Product Support - EDI Specialist
Farrow
North Dumfries, ON
…Electronic Data Interchange (EDI) environment at Farrow. They will lead various EDI projects by collaborating with vendors, customers and Farrow Operations and IT team member’s to design…
Added 18 days ago
Salesforce QA Automation Engineer
Astra-North Infoteck Inc. ~ Conquering today’s challenges, achieving tomorrow’s vision!
Toronto, ON
Full-time
Develop and execute UI and API automation using Selenium, Java, JavaScript, or equivalent automation tools and frameworks.
Added 18 days ago
Senior Java Developer (ETL)
Synechron
Montreal, QC
$100,000 to $110,000 CAD / year
Full-time
Synechron is seeking an experienced backend developer with strong Core Java and Spring Boot skills to lead the understanding, enrichment, and enhancement of existing ETL processes. This…
Added 18 days ago
Software Engineering Manager
Groom & Associés / Associates
Montreal, QC · Greater Montreal Metropolitan Area
$175,000 to $190,000 CAD / year
Full-time
The team is hiring a Manager of Engineering to lead the engineering group that builds and operates our research data management platform. Reporting to the CTO, you will lead how the…
Added 18 days ago
JAVA TECHNICAL LEAD L1
Wipro
Toronto, ON
Full-time
Added 18 days ago
Java Backend Lead
J&M Group
Toronto, ON
Contract
We are hiring for a Java Backend Lead. The role focuses on Java backend development, enterprise application development, and relational database technologies.
Added 13 days ago
Senior Embedded Software Developer
ZTR
London, ON
Full-time
Lead code reviews and collaborate across all phases of the Software Development Life Cycle
Added 13 days ago
Associate Principal Engineer - Snowflake AI Architect
Nagarro
Brampton, ON
Full-time
Architect and lead the design of enterprise-scale Snowflake Cortex AI solutions, including Cortex AISQL, Cortex Analyst, Cortex Search, Cortex Agents, Document AI, and fine-tuning.
Added 13 days ago
Investor Services Technology - Tax Solutions Lead - Senior Vice President
Citi
Mississauga, ON
Full-time
Citi's Investor Services Technology group is seeking a transformation focused Tax Reclaim Transformation Technology Lead the end-to-end digitization and automation of Citi's global…
Added 18 days ago
Data Steward
EXFO
Montreal, QC
Full-time
Connaissances de base de Git et en programmation/scripting (Python, Bash, Java).
Added 18 days ago
Project Manager
Victor Energy
Winnipeg, MB
Full-time
As part of the Java Group, Victor Energy's staff have over 50 years of experience building some of Canada's largest electrical infrastructure projects. As our team grows and projects are…
Added 18 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 13 days ago
Quality Coordinator (Site)
Victor Energy
Remote, Canada
Full-time · Remote
As part of the Java Group, Victor Energy’s staff have over 50 years of experience building some of Canada’s largest electrical infrastructure projects.
Added 13 days ago
Android Software Developer – Infotainment OnStar
General Motors
Markham, ON
Full-time
…in software engineering for the position of Android Software Developer – Infotainment OnStar within GM’s Digital Vehicle Experience…
Added 13 days ago
Technical Account Manager
Glia
Remote, Canada
Full-time · Remote
Lead complex troubleshooting and provide proactive technical guidance
Added 12 days ago
Senior Director, Engineering - Innovation Tribe
Fitch Group
Toronto, ON
Fitch Ratings is seeking a visionary Senior Director of Engineering to lead our Innovation Tribe in Toronto - a bold, strategic investment in defining the future of AI-powered financial…
Added 13 days ago
Senior Java Developer – Vice President
Citi
Mississauga, ON
Full-time
Citi is looking for a Senior Java Developer to design, build, and evolve enterprise-grade shared services that underpin high-volume, mission-critical financial systems. In this role, you…
Added 18 days ago
Software Engineer, Professional Senior (Android + NFC/RFID +AI )
Zebra Technologies
Mississauga, ON
Full-time
You’ll have opportunities to learn and lead in a forward-thinking environment, defining your path to a fulfilling career while channeling your skills toward causes you care about - locally…
Added 18 days ago
Senior Specialist, Item File
Walmart Canada
Mississauga, ON
Full-time
Lead and support projects focused on improving Data set up /maintenance, clean up and governance processes, tools, systems, and ways of working.

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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