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Added 3 days ago
G
Développeur(euse) logiciel / Software Developer - CSOL
Genetec
Montreal, QC
- Full-time
…part of the Development Partner Experience Group. Together with multidisciplinary teams in Paris and Montreal, we create innovative solutions tailored to unique, individual business needs.…
Added 3 days ago
Fullstack Developer
Adastra Corporation
Markham, ON
We are seeking a Full Stack Developer with a strong focus on frontend engineering to help build modern, user-centric web applications that deliver analytics, AI-driven insights, operational…
Added 3 days ago
FG
Software Developer | Banking & Capital Markets
FDM Group
Toronto, ON
- Contract
FDM is seeking a Experienced Software Developer located in Toronto to support a project in the Banking & Capital Markets sector. Involvement in this project is anticipated to last initially…
Added 3 days ago
TF
Software Development Lead
Turner Fleischer
Toronto, ON
- Full-time
Design and develop software solutions using .NET, React, MySQL, APIs, and Linux-based infrastructure.
Added 3 days ago
SH
Software Developer - Enhance Ontario
Scarborough Health Network
EO Head Office
- Full-time
Advanced proficiency in web development technologies such as JavaScript, HTML5, CSS, React/Vue, and backend frameworks (e.g., Node.js, .NET, or Django)
Added 3 days ago
AA
Backend Software Developer
ATS Automation
Cambridge, ON
- $36.54 to $50.24 CAD / hour
Ensure that tasks are appropriately sized for continuous integration and incremental delivery with help from teammates and Staff Software Developer
Added 3 days ago
TT
Senior Full Stack Software Engineer
True Talent Solutions Partners
Canada
- $200,000 to $275,000 USD / year
- Full-time
…product improvements from early prototypes through production, with significant ownership and a focus on AI-assisted…
Added 3 days ago
CO
Application & Integration Technical Analyst
City of Saint John
Saint John, NB
- Full-time
Administer identity, access, and licensing for applications (e.g., roles and permissions, provisioning) in alignment with governance and audit requirements
Added 3 days ago
MT
Full Stack Engineer
MVP Talent Corp
Calgary, AB
- $130,000 to $145,000 CAD / year
- Full-time
We are looking for a Full-Stack developer with extensive expertise in both traditional programming techniques and the use of modern AI-assisted development tools and technologies. Knowledge…
Added 3 days ago
A
Automation Developer - Winnipeg Satellite Office
AutoCanada
Winnipeg, MB
- $75,000 to $90,000 CAD / year
- Other
Experience with full-stack web development (C#, .NET, JavaScript, React, or similar technologies) is a strong asset
Added 3 days ago
FM
Manager, Application Support and Software Development
Farm Mutual Re
Cambridge, ON
- Full-time
Developer certifications such as .Net, React, Node.js, Azure Cloud or related
Added 3 days ago
Manager, Software Engineering
KEV Group
Toronto, ON
Technical Leadership: Set technical direction for teams building on React, .NET, and API-driven microservice architectures on Azure. Work with your Tech Leads to manage cross-team technical…
Added 3 days ago
QC
Senior Software Engineer
Quarry Consulting
Canada
- Full-time
Experience in full-stack development (React/Angular, JavaScript, HTML, CSS, C#, .NET Core)
Added 4 days ago
AT
.NET Developer
Aarorn Technologies Inc
Montreal, QC
- $60 CAD / hour
- Contract
Built a .NET Core web job with Entity Framework Core to automatically pull and process documents, invoices, and service records from Azure Storage and deliver them to end clients.
Added 4 days ago
CO
Application & Integration Technical Analyst
City of Saint John
Saint John, NB
- Full-time
Administer identity, access, and licensing for applications (e.g., roles and permissions, provisioning) in alignment with governance and audit requirements
Added 4 days ago
Senior Technical Delivery Manager - Web & Cloud Platforms
Rogers Communications
Toronto, ON
…and day-to-day operations, using modern technologies such as React, Angular, Node.js, Java/Spring Boot and .NET, deployed on AWS, Azure or Google Cloud with Kubernetes and serverless…
Added 4 days ago
IC
Frontend Developer
IT Connex
Toronto, ON
- Contract
We are seeking an experienced Senior Software Engineer with strong expertise in React, JavaScript, and modern web application development to join a team responsible for building and…
Added 4 days ago
SC
Senior Software Developer
Staples Canada
Richmond Hill, ON
- $73,900 to $92,400 USD / year
- Full-time
We are seeking a highly skilled Senior Software Developer to join our dynamic team. The ideal candidate will have extensive experience in C#, .NET, Web Services, WCF, Web API, Microsoft…
Added 4 days ago
K
Javascript Developer
Kelly
Toronto, ON
- Contract
Job Title: Senior React / JavaScript Developer
Added 4 days ago
SI
Senior Software Developer
Staples Inc.
Richmond Hill, ON
- Full-time
We are seeking a highly skilled Senior Software Developer to join our dynamic team. The ideal candidate will have extensive experience in C#, .NET, Web Services, WCF, Web API, Microsoft…
Added 4 days ago
AS
UI/UX Engineer
Axelon Services Corporation
Toronto, ON
- $74 to $78 USD / hour
- Contract
Partner with multiple teams to ensure appropriate integration of functions to meet goals and identify necessary system enhancements.
Added 4 days ago
LH
2600001909 - Sr. Digital Solutions Developer
Lakeridge Health
Whitby, ON
- Internship
Strong hands-on full-stack development skills, ideally React (TypeScript/JavaScript) and .NET/C#, with REST APIs and relational databases (SQL Server, PostgreSQL, or MySQL).
Added 4 days ago
CO
Application & Integration Technical Analyst
City of Saint John
Saint John, NB
- Full-time
Administer identity, access, and licensing for applications (e.g., roles and permissions, provisioning) in alignment with governance and audit requirements
Added 4 days ago
KS
Dot Net
Kumaran Systems
Toronto, ON
- Full-time
Design and build scalable backend services in .NET 8 / C# and Web APIs.
Added 4 days ago
XI
Senior .NET / Full Stack Developer
XTM International
Remote, Canada
- Full-time
- Remote
We are looking for a Senior Full Stack Developer who works AI-first: someone who uses AI tools and AI-driven development methods as a natural part of how they build software, and who helps…

IT Connex

Frontend Developer

Toronto, ON, Canada

Contract

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Job details

Job type: Contract
Apply by: Nov 26, 2026
Posting language: English
Posted: Oct 27, 2026

Original job description

Senior Software Engineer – React / JavaScript

Location: Toronto, ON

Work Arrangement: Hybrid – 3 days per week onsite

Experience: 10+ years

Job Overview

We are seeking an experienced Senior Software Engineer with strong expertise in React, JavaScript, and modern web application development to join a team responsible for building and enhancing a large-scale Fixed Income trade processing platform.

The platform supports global trading operations across derivatives, cash products, exotics, and securities financing transactions. It processes approximately 200,000 transactions daily and provides real-time position and risk management capabilities.

In this role, you will contribute to the evolution of a next-generation trading application, focusing on modern UI/UX engineering, service-oriented architecture, automated CI/CD pipelines, and improvements to system performance, scalability, and reliability.

Key Responsibilities

Design, develop, and maintain robust, scalable, and testable web applications using React, JavaScript, HTML5, and Node.js.
Collaborate with cross-functional teams to integrate application functionality and deliver new products and process improvements.
Lead technical design and implementation, ensuring solutions align with enterprise architecture standards.
Analyze complex business and system processes to identify issues and develop innovative technical solutions.
Improve application performance, scalability, reliability, and testability through effective engineering practices.
Contribute to the transition toward smaller, modular services and fully automated CI/CD pipelines.
Establish and promote standards for coding, testing, debugging, and deployment.
Identify and implement system enhancements that improve operational efficiency and time to market.
Assess and manage technical and operational risks while ensuring compliance with applicable policies and controls.
Provide technical guidance and mentorship to mid-level developers and analysts, including coordinating development activities when required.

Required Skills and Qualifications

8+ years of experience in software application development.
Strong hands-on experience with React, JavaScript, and HTML5.
Experience with Node.js and modern web development concepts.
Strong understanding of application architecture, system integration, and software design principles.
Experience developing high-quality, testable code and troubleshooting complex application issues.
Knowledge of performance optimization, scalability, reliability, and non-functional requirements.
Experience working in large, collaborative development environments.
Familiarity with automated testing, CI/CD pipelines, and modern software delivery practices.
Demonstrated technical leadership, problem-solving, and mentoring skills.
Ability to manage competing priorities and adapt to changing business requirements.

Nice to Have

Experience with Fixed Income products, trading platforms, or capital markets applications.
Knowledge of C# and the .NET Framework.
Experience with derivatives, cash products, or securities financing transactions.
Exposure to service-oriented or microservices architectures.

Education

Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience.
Master’s degree is preferred.

Ideal Candidate

The ideal candidate is a hands-on senior engineer with strong React and JavaScript expertise, experience building enterprise-scale applications, and the ability to lead technical implementation. Experience in financial services or Fixed Income trading platforms is an advantage.

Please note: This role requires working onsite in Toronto three days per week.

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More about this job

Responsibilities

Design, develop, and maintain scalable React and JavaScript applications for a large-scale fixed-income trade processing platform, while improving performance, reliability, and testability. Lead technical implementation, promote engineering and delivery standards, support modular services and automated CI/CD, and mentor developers and analysts.

Requirements

Requires 8+ years of software application development experience, strong hands-on React, JavaScript, and HTML5 skills, and experience with Node.js, architecture, integration, testing, and complex troubleshooting. Candidates should demonstrate technical leadership, mentoring, and collaboration skills; a bachelor's degree or equivalent experience is required, and a master's degree is preferred.

Skills

React
JavaScript
HTML5
Node.js
Application Architecture
System Integration
Software Design
Performance Optimization
Scalability
Automated Testing
CI/CD
Technical Leadership
Mentoring
Service-Oriented Architecture
Microservices
Fixed Income Trading

Visa sponsorship

Not detected in the job text

Keywords

React
JavaScript
HTML5
Node.js
C#
.NET Framework
Fixed Income
Trade Processing
Trading Platforms
Capital Markets
Derivatives
Cash Products
Securities Financing
Application Architecture
System Integration
Software Design
Service-Oriented Architecture
Microservices
CI/CD Pipelines
Automated Testing
Performance Optimization
Scalability
Reliability
Non-Functional Requirements
Technical Leadership
Mentoring
Enterprise Applications
Risk Management
Toronto

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