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Added 26 days ago
AT
Java Full stack Developer
Aarorn Technologies Inc
Toronto, ON
- $50 CAD / hour
- Contract
Extensive experience in developing and maintaining applications using Scala/Java. Proficient in building scalable and robust applications using Spring Framework (Spring Core, Spring MVC,…
Added 26 days ago
AT
Core Java Developer
Aarorn Technologies Inc
Montreal, QC
- $50 CAD / hour
- Contract
Well-versed in Core Java (1.8 and above preferable, with knowledge of new features like Executor framework, Generics, etc.)
Added 1 month ago
MP
Quality Management and Data Support Specialist
Municipal Property Assessment Corporation
Pickering, ON
- Full-time
Experience in at least one general programming and/or scripting language such as Java, Python, C++, SQL, etc; and proficient with GIS and visualization tools such as QGIS, ArcView,…
Added 1 month ago
AE
Application Engineer, Integrations (SAP)
Arc'teryx Equipment
North Vancouver, BC
- $80,000 to $100,000 CAD / year
- Full-time
If you were the Integration Developer (SAP) now, here are some of the core activities you would be doing:
Added 1 month ago
ID
Senior Java Software Engineer
Intellect Design Arena Ltd
Toronto, ON
- $105,000 to $120,000 CAD / year
- Full-time
We are seeking a strong Java Tech Lead with proven experience in delivering scalable microservices and cloud based applications. The ideal candidate will be responsible for leading…
Added 1 month ago
H
Architecte logiciel
Highspring
Montreal, QC
- Full-time
Added 1 month ago
TC
Full stack Developer
Tata Consultancy Services
Mississauga, ON
- $100,000 to $120,000 CAD / year
- Full-time
1. Backend Expertise: Strong proficiency in Java with comprehensive hands-on experience Spring boot, Microservices,
Added 1 month ago
TP
Developer, Digital Team
Toronto Police Service
Toronto, ON
- Temporary
The Toronto Police Service is looking for a candidate that shares our core values:
Added 1 month ago
P
QE with Contact Center Tools & Amazon Connect
PeoplePilot
Toronto, ON
- Full-time
The ideal candidate will have hands-on experience with contact center technologies and automation testing across UI and APIs, along with strong Java programming skills.
Added 25 days ago
A
Curam Development Lead
Accenture
Calgary, AB · Vancouver, BC · Winnipeg, MB · Ottawa, ON · Toronto, ON · Montreal, QC
- Full-time
Proficiency in Java, J2EE, and web technologies.
Added 1 month ago
V
Sr. Staff Infrastructure Engineer
VGS
Canada
- Full-time
…with a highly consistent modern stack (e.g. AWS, Kubernetes, Java, TypeScript, Python) and world-class AI-augmented SDLC tooling. We strip away the friction so you can focus on the problems…
Added 26 days ago
E
Software Developer
Ericsson
Mississauga, ON · Ottawa, ON
- Full-time
We are currently seeking a passionate and skilled Software Developer to join our multi-functional Research and Development team and part of a larger Global Organization to developing…
Added 26 days ago
C
Senior Java Full Stack Developer - Vice President
Citi
Mississauga, ON
- Full-time
…brokerage, transaction services, and wealth management. Our core activities are safeguarding assets, lending money, making payments, and accessing the capital markets on behalf of our…
Added 26 days ago
C
Senior Java Full Stack Developer – Vice President
Citi
Mississauga, ON
- Full-time
…brokerage, transaction services, and wealth management. Our core activities are safeguarding assets, lending money, making payments, and accessing the capital markets on behalf of our…
Added 26 days ago
R
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 26 days ago
R
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 25 days ago
Software Engineer (Full Stack)
Synpulse
Toronto, ON
Our core values – Embrace, Drive, Achieve – shape how we work and evolve. We don’t just offer jobs – we offer the chance to develop, make an impact, and be part of a team that’s redefining…
Added 25 days ago
VV
Java Developer 1015
Veracity Ventures Inc.
Remote, Canada
- Full-time
- Remote
We’re hiring an experienced Java Developer to join a high-performing technology team working on scalable, secure, enterprise-grade applications within a fast-paced financial services…
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 26 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 25 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
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 26 days ago
Research Intern, PhD, Summer 2027
Google
Montreal, QC
Experience with one or more general purpose programming languages (e.g., Python, Java, JavaScript, C/C++, etc.).
Added 27 days ago
M
Senior Software Engineer
Microsoft
Vancouver, BC
- Full-time
…pioneering conversational search experiences. We build the core systems behind Microsoft 365 Copilot, a groundbreaking AI assistant used by hundreds of millions of people worldwide. Our…
Added 1 month ago
ZT
Software Engineer, Professional Senior (Android + NFC/RFID +AI )
Zebra Technologies
Mississauga, ON
- Full-time
In-depth understanding of Core Java, C, C++, and OOP concepts.

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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