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Added 2 hours ago
RD
Vb.net Developer
Randstad Digital
Toronto, ON
- Contract
…modernization initiatives moving legacy modules toward modern .NET Core / C#…
Added 7 hours ago
YC
Senior Developer, D365
Yoush Consulting
Toronto, ON
- Full-time
As a Senior Developer, Dynamics 365 your responsibilities will include:
Added 14 hours ago
M
RQ11819 - Software Developer - Senior
Maarut
Toronto, ON
- Contract
experience with .NET web application development (C#, ASP.NET, Web APIs).
Added 15 hours ago
T
Senior .NET Software Developer – Azure, C#, ASP.NET & SQL Server
ThoughtStorm
Toronto, ON
- Contract
We're Hiring: Senior .NET Software Developer – Azure, C# & SQL Server
Added 22 hours ago
S
Senior Full-Stack Web Developer (C#/MS-SQL/Front-end) - Western Canada
Splashdot
Remote, Canada
- $110,000 to $140,000 CAD / year
- Full-time
- Remote
Senior Full-Stack Web Developer (C#/MS-SQL/Front-end) – Western Canada
Added 1 day ago
Software Engineering Team Lead - Industrial Automation & Robotics Platform
Lincoln Electric
Hamilton, ON
Design, develop, and maintain applications using C#, .NET Framework 4.8, .NET Standard 2.0, and .NET 6+.
Added 1 day ago
SC
Senior Environmental Data Engineer
SLR Consulting
Calgary, AB · Vancouver, BC · Guelph, ON
- Full-time
5+ years of professional C# and modern .NET development within collaborative, code‑reviewed teams
Added 1 day ago
Senior Software Developer
Range Group - Job Postings
Toronto, ON
We're looking for an experienced developer to join TripArc as a Senior Software Developer. You'll work on a mature travel platform that thousands of travel professionals rely on every day,…
Added 1 day ago
Senior Software Developer
Range
Toronto, ON
We're looking for an experienced developer to join TripArc as a Senior Software Developer. You'll work on a mature travel platform that thousands of travel professionals rely on every day,…
Added 1 day ago
Senior Software Developer
TripArc
Toronto, ON
We're looking for an experienced developer to join TripArc as a Senior Software Developer. You'll work on a mature travel platform that thousands of travel professionals rely on every day,…
Added 1 day ago
RB
Senior Quality Engineer
Royal Bank of Canada
Toronto, ON
- Full-time
Experience in financial services, banking, or wealth management; Experience with platform conversions, data migrations, .NET technologies (C#, ASP.NET, VB.NET)
Added 1 day ago
LI
Software Developer
Lotus IT Solutions
Toronto, ON
- Contract
The Ministry of Treasury Board Secretariat (Central Agencies Cluster) is seeking a Senior Software Developer to join their team onsite at 222 Jarvis Street, Toronto. In this role, the…
Added 1 day ago
AI
Senior Power Platform Engineer
Aptino, Inc.
Quebec, QC
- Contract
Strong knowledge of Microsoft Azure, Azure DevOps, CI/CD, and C#/.NET.
Added 1 day ago
R
Senior Quality Engineer
RBC
Toronto, ON
- Full-time
Experience in financial services, banking, or wealth management; Experience with platform conversions, data migrations, .NET technologies (C#, ASP.NET, VB.NET)
Added 1 day ago
I
Software Developer - Senior
isgSearch
Toronto, ON · Greater Toronto Area, Canada
- Contract
We are seeking an experienced Software Developer to design, develop, test, and maintain enterprise applications using Microsoft .NET technologies, SQL Server, and Microsoft Azure.
Added 1 day ago
B
Software Developer - Senior-.NET
Bevertec
Toronto, ON
- Contract
Strong experience with .NET web application development (C#, ASP.NET, Web APIs).
Added 1 day ago
TC
Full Stack Engineer
Triton Canada
Toronto, ON · Greater Toronto Area, Canada
- Full-time
We are seeking a highly capable Full Stack Application Developer (Mid–Senior Level) to join our technology team and contribute to the delivery of high-quality, secure, scalable, and…
Added 2 days ago
T
Senior Consultant, Software Delivery Developer - Gen AI and AI-Accelerated Modernization
Toast
Montreal, QC
- $77,000 to $102,000 USD / year
- Full-time
…more than 10,000 people across Canada. We’re looking for a Senior Consultant, Software Delivery Developer to join their Gen AI and Software Delivery team in Montreal or Quebec City. This…
Added 2 days ago
Developer
Insurance Corporation of British Columbia
North Vancouver, BC
JavaScript, Python, C#, .NET, Git, and Azure DevOps experience.
Added 2 days ago
CS
Azure .Net Developer
Cyber Space Technologies LLC
Toronto, ON
- Contract
We are seeking a highly skilled Senior Azure Applications Developer with extensive experience in cloud-based application development, specifically within the Microsoft Azure ecosystem. In…
Added 2 days ago
SS
Senior Event Streaming Engineer (Kafka / Azure Event Hubs)
Syncredible Solutions
Canada
- Contract
Programming proficiency in C#/.NET for Kafka integration or bridge development.
Added 2 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 2 days ago
CS
Senior Technical Architect, Application Development & Support
Canadian Standards Association
Toronto, ON
- Full-time
Develops, enhances, debugs, and supports Java and Microsoft .NET/C# applications and services, including REST/SOAP web services and background/batch processing.
Added 2 days ago
IC
Frontend Developer
IT Connex
Toronto, ON
- Contract
Senior Software Engineer – React / JavaScript
Added 2 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…

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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