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Added 13 mins ago
Group Manager – Flow Monitoring
AECOM
Markham, ON
$130,000 to $160,000 CAD / year
Full-time
…multidisciplinary team of approximately 15 staff members - including senior engineers, data analysts, and field technicians - while driving business growth and maintaining high-level client…
Added 27 mins ago
Senior Engineer
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Canada
Contract
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Added 27 mins ago
Senior Backend Engineer, NodeJS | LATAM
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Senior Data Engineer, Analytics
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Added 44 mins ago
DevOps Manager
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Added 57 mins ago
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Added 58 mins ago
Sr. Full Stack Developer, TD Securities
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We are looking for a Senior Engineer to join the Equity Derivatives Technology Team and embrace a broad range of tasks associated with developing application and systems solutions to…
Added 58 mins ago
Senior Quality Assurance Automation Engineer, Guidewire
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Added 58 mins ago
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Montreal, QC
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Strong hands-on expertise in load and performance testing of web applications and REST APIs.
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Director, Maintenance
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Senior Software Engineer
Autodesk
Toronto, ON · AMER - Canada - Ontario - Toronto - University Ave
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Senior Service Designer
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Toronto, ON · Montreal, QC · Laval, QC · Calgary, AB
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Sr. Integration Architect - Automation
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Added 2 hours ago
Senior Cybersecurity Engineer
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Added 2 hours ago
Senior Java Software Engineer (Backend / Systems-Focused)
Collabera
Toronto, ON
$90 to $95 CAD / hour
Contract
Title: Senior Java Software Engineer (Backend / Systems-Focused)
Added 2 hours ago
Sr. Software Engineer (Salesforce), Specialty Health Technology
Loblaw Companies Limited
Brampton, ON
Full-time
Senior Software Engineer (Salesforce) - Specialty Health Technology

Collabera

Senior Java Software Engineer (Backend / Systems-Focused)

Toronto, ON, Canada

Pay: $90 to $95 CAD / hour
Job type: Contract
Apply by: Oct 28, 2026
Experience: 8-10+ years of experience as a Java Backend Engineer
Working hours: 37.5 hours/week
Posting language: English
Posted: Sep 28, 2026

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Original job description

Title: Senior Java Software Engineer (Backend / Systems-Focused)

Type: 6-Month Contract (with possibility to extend)

Location: Toronto, ON - Mon-Thurs Onsite (4 days/week), 37.5 hours/week

Start Date: ASAP

Interview Process: Approx. 2 rounds - 1 technical deep dive + 1 onsite/team fit

Compensation: $90-$95/Hour

Day-to-Day Responsibilities:

The Senior Java Engineer will focus on designing and building scalable backend systems while driving modernization efforts across a complex application landscape.
A significant portion of the role involves analyzing, decomposing, and re-architecting legacy systems, including migrating workloads to AWS (EC2, RDS) and improving overall system performance, reliability, and maintainability.
They will build services responsible for data ingestion, transformation, validation, and distribution, working with data-heavy workflows (including market data).
The engineer will also play a key role in system design and architecture, making pragmatic tradeoffs (e.g., scalability vs simplicity) and ensuring solutions are production-ready.
Additional responsibilities include troubleshooting complex production issues (e.g., memory leaks, concurrency issues, latency bottlenecks), implementing observability practices (logging, metrics, tracing), and building resilient systems (retries, failure handling, circuit breakers).
The remaining portion of the role includes collaborating with engineers and stakeholders, helping clarify ambiguous requirements, shaping solutions, and providing technical leadership through code reviews and mentorship.

Must-Haves:

8-10+ years of experience as a Java Backend Engineer
Strong expertise in Core Java (collections, concurrency, JVM internals, memory model)
Experience with performance tuning, garbage collection, and profiling
Hands-on experience with Spring (Boot, MVC, Data) and Hibernate/JPA
Strong system design and distributed systems knowledge (caching, messaging, eventual consistency)
Experience with AWS or cloud-based architectures
Strong SQL and data handling experience
Proven ability to troubleshoot complex production issues
Experience building systems beyond simple CRUD APIs (data pipelines, processing systems, etc.)
Ability to operate in ambiguity and define solutions—not just execute tasks

Pluses:

Experience with data-intensive systems or data pipelines
Exposure to microservices architecture (Spring ecosystem)
Background in capital markets / financial services
Experience modernizing or replacing legacy systems at scale
Familiarity with CI/CD pipelines and DevOps practices

We may use AI-enabled and/or automated tools to support parts of our recruitment process, including application screening, interview scheduling, and candidate communications. These tools are used to enhance consistency and efficiency. All hiring decisions involve human review and are not based solely on automated processing.

The Company offers a total rewards package in accordance with all applicable federal, provincial, and local laws and requirements. Benefit eligibility and offerings vary based on role, employment status, and work location. For contractor positions, benefits are limited to those entitlements and protections required by applicable law, which may include (as applicable) vacation pay, public holidays, leaves of absence, and other legally mandated benefits or payments.

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More about this job

Responsibilities

Design and build scalable backend systems, modernize and re-architect legacy applications, and migrate workloads to AWS. Develop data ingestion and processing services, improve performance and reliability, troubleshoot production issues, implement observability and resilience practices, and provide technical leadership through collaboration, code reviews, and mentorship.

Requirements

Requires 8–10+ years of Java backend engineering experience, strong Core Java and JVM expertise, and hands-on experience with Spring, Hibernate/JPA, SQL, AWS, and distributed systems. Candidates must be able to tune performance, resolve complex production issues, build systems beyond basic CRUD APIs, and define solutions amid ambiguity.

Skills

Java
Core Java
Concurrency
JVM Internals
Performance Tuning
Garbage Collection
Profiling
Spring Boot
Spring MVC
Spring Data
Hibernate
JPA
System Design
Distributed Systems
AWS
SQL

Visa sponsorship

Not detected in the job text

Keywords

Java
Core Java
Spring Boot
Spring MVC
Spring Data
Hibernate
JPA
AWS
EC2
RDS
SQL
JVM Internals
Concurrency
Memory Model
Garbage Collection
Performance Tuning
Profiling
System Design
Distributed Systems
Caching
Messaging
Eventual Consistency
Data Pipelines
Data Ingestion
Market Data
Microservices
Legacy System Modernization
Observability
CI/CD
DevOps

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