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Added 1 month ago
ES
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 1 month ago
N
Software Developer - Applications
Nakisa
Montreal, QC
- Full-time
As a Software Developer at Nakisa, you will design, build, and maintain scalable, cloud-native applications used by Fortune 1000 companies around the world. Working within an Agile team,…
Added 29 days ago
IS Product Support - EDI Specialist
Farrow
North Dumfries, ON
Added 29 days ago
RE
Engineer, DevOps
Recurrent Energy
Kitchener, ON · CA Kitchener
- Full-time
Proficiency in scripting languages (e.g., Python, Bash, Java, Ruby, PHP, PowerShell).
Added 29 days ago
Resident Maintenance Technician
KION Group
Montreal, QC · DEMATIC Montreal
Added 29 days ago
GP
Senior Software Engineer
Generac Power Systems
Toronto, ON · Canada - Toronto
- Full-time
We also use Java, Python, and JavaScript, and value choosing the right tool for the job.
Added 1 month ago
E
Geographic Information System Developer
Elastify
Toronto, ON
- Full-time
We're hiring a Senior GIS Full Stack Developer on behalf of one of our clients. This is an opportunity to join a collaborative technology team building and supporting enterprise web…
Added 1 month ago
PG
Salesforce (FSC) QA Analyst
Pacer Group
Toronto, ON
- $45 to $48 CAD / hour
- Contract
Hands-on expertise in QA Automation using Selenium with Java/JavaScript.
Added 1 month ago
ET
Android Developer
Envision Technology Solutions
ON · Ontario, Canada
- Full-time
· At least 5 years of experience developing native Android applications and 3+ years of Java development experience
Added 1 month ago
JG
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 1 month ago
E
Spécialiste en gouvernance et qualité des données
EXFO
Quebec, QC
- Full-time
Connaissances de base en programmation ou en scripting (Python, Bash, Java, ou similaire).
Added 1 month ago
R&
Intermediate Backend Developer (Integration)
Robertson & Company Ltd.
Toronto, ON
- Contract
Robertson is seeking a skilled Intermediate Backend Developer (Integration) Lending Platforms to join our client in support of an existing vacancy.
Added 29 days ago
Software Development Engineer, Tax Engine
Amazon
Vancouver, BC
…building highly scalable and reliable systems or a software developer who likes to solve business problems, Amazon Tax Platform Services is the place for…
Added 29 days ago
IC
Application Security, Senior Specialist
Interac Corp.
Toronto, ON · Interac Corp. Head Office
- Full-time
Identify opportunities to improve automation, reduce friction, and enhance developer experience.
Added 28 days ago
N
Associate Principal Engineer - Snowflake AI Architect
Nagarro
Brampton, ON
- Full-time
Drive adoption of Snowpark (Python/Java/Scala) for advanced data engineering and ML workflows.
Added 1 month ago
VE
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 1 month ago
OS
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 29 days ago
VE
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 29 days ago
HP
Helical Pile Operator
Helical Pile Solutions
Nisku, AB
- Full-time
…30 years of experience in the industry, recently acquired by Java Holdings Ltd. (“Java”). Java staff have over 50 years of experience building some of Canada’s largest electrical…
Added 29 days ago
G
Technical Account Manager
Glia
Remote, Canada
- Full-time
- Remote
Mobile Technologies (e.g., Swift, Java, Kotlin)
Added 1 month ago
A
Senior Full Stack Engineer (Application + Data)
Article
Vancouver, BC
- $165,000 to $175,000 CAD / year
- Full-time
Build backend applications, APIs, integrations, and services using Java.
Added 1 month ago
C
Coop AI Developer
CGI
Calgary, AB
- Full-time
Winter 2027 Co-op: AI Software Developer (4 - 8 Months)
Added 1 month ago
C
Specialist Developer-Java
CPKC
Calgary, AB
- Full-time
At CPKC, technology drives the safe and efficient movement of freight across North America. As a Specialist Developer-Java, you will play a key role in designing, developing, implementing,…
Added 28 days ago
Senior Director, Engineering - Innovation Tribe
Fitch Group
Toronto, ON
Added 29 days ago
C
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…

Open Systems Technologies

Back End Java

Mississauga, ON, Canada

Contract

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Job details

Job type: Contract
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

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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