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Added 19 days ago
Software Developer, Business Engineering
Caivan Development Corporation
Ottawa, ON
Up to $80,000 CAD / year
We are seeking a curious & analytical Software Developer within our Caivan | ABIC Business Engineering Team. This is an entry-level development role responsible for building and testing…
Added 24 days ago
Senior Full Stack Developer (.NET, React & Cloud Technologies)
Cognizant
Halifax, NS
Full-time
As a Senior Full Stack Developer, you will make an impact by designing, developing, and supporting scalable web applications and cloud-based solutions that drive business outcomes. You will…
Added 24 days ago
.Net Developer
J&M Group
Vancouver, BC
Full-time
We are looking for a Senior .NET Developer with 10+ years of experience to build and maintain secure, scalable enterprise applications.
Added 20 days ago
Senior Specialist, Software Engineering
CMHC - SCHL
Ottawa, ON · Montreal, QC
We are looking for an experienced Azure Developer to design, build, and support cloud native integrations and applications that power our enterprise platforms. The ideal candidate has…
Added 24 days ago
Sr. Windows API & Browser Extension Developer
TechDoQuest
Brampton, ON
$55 to $63 CAD / hour
Contract
We are seeking an experienced Senior Windows API & Browser Extension Developer to design, develop, and implement a secure Windows-based integration solution for a standalone enterprise…
Added 25 days ago
System Testing/QA Specialist
Russell Tobin
Toronto, ON
$63 to $68 CAD / hour
Contract
Our client, a public organization sector, is seeking an experienced Senior Systems Testing/QA Specialist to support large-scale application testing and quality assurance initiatives.
Added 25 days ago
Dotnet Developer
Kumaran Systems
Toronto, ON · Greater Toronto Area, Canada
Full-time
A hands-on senior developer role focused on building, integrating, and supporting enterprise applications on the Microsoft/Azure stack. You'll build the solution based on designs from…
Added 21 days ago
Sr. Staff Developer, Architecture
iQmetrix
Regina, SK
Full-time
We are hiring a Principal Engineer, Architecture. This is a senior individual contributor role for someone who is still happiest with their hands on the keyboard, and who thinks in systems…
Added 21 days ago
Consultant senior - Modernisation des applications | Sr. Consultant - Application Modernization, AWS Professional Services
Amazon
Montreal, QC
- Moderniser les stacks technologiques existantes (par exemple, .NET Framework vers .NET Core, Java EE vers Spring Boot, transformation mainframe/COBOL)
Added 21 days ago
Senior Full-Stack Developer
Jonas Software
Markham, ON · Canada - Markham - Ontario
Full-time
We are looking for a highly experienced Senior Full-Stack Developer who thrives in a fast-paced environment and enjoys solving complex business and technical challenges. You will play a key…
Added 21 days ago
RQ11400 - Software Developer - Senior
Maarut
Toronto, ON
Contract
WebSphere, WebLogic, SUN Solaris, Windows 2008/2012, .NET, VPN, PKI, LDAP,
Added 21 days ago
TechLead, Software Development
Univeris
Toronto, ON
Full-time
Tech Leads at Univeris are senior engineers and people managers who are equally accountable for the technical quality of their team's output and the professional growth of every developer…
Added 25 days ago
Offensive Security Engineer
Synechron
Toronto, ON
$110,000 to $120,000 CAD / year
Full-time
Communicate technical design, risk trade-offs, and delivery progress clearly to senior stakeholders including CIO, CISO, 2LOD, and Audit functions.
Added 25 days ago
Full Stack Developer
Tata Consultancy Services
Toronto, ON
$100,000 to $120,000 CAD / year
Full-time
We are seeking a highly experienced Full Stack Developer with Senior years of expertise in designing, developing, and delivering scalable web and enterprise applications. The ideal…
Added 25 days ago
Senior Developer
ESC Corporate Services
Toronto, ON
Full-time
We are seeking a Senior Developer to play a key role in modernizing our core applications with a strong focus on accessibility and compliance with Web Content Accessibility Guidelines (WCAG…
Added 21 days ago
Senior Tech Lead
Maarut
Levis, QC
Contract
contributions to the delivery of medium to large-scale .NET systems. The
Added 20 days ago
Sr. Associate, Front End Developer
Appnovation Technologies
Vancouver, BC
As a Senior Frontend Developer, you will build the user-facing application for a modern operational SaaS platform for K-12 education. The platform helps school divisions automate…
Added 20 days ago
Associate QA
Appnovation Technologies
Vancouver, BC
…get hands-on exposure to API and integration testing against .NET services, multi-tenant permission testing under Keycloak and OpenFGA, and validating data that flows from PostgreSQL into a…
Added 25 days ago
Developer
Java Holdings Ltd
Calgary, AB
Full-time
…Management) services. We are seeking a motivated, detail-oriented Developer to join our growing software development team in the Edmonton or Calgary…
Added 25 days ago
Developer
Java Holdings Ltd
Edmonton, AB
Full-time
…Management) services. We are seeking a motivated, detail-oriented Developer to join our growing software development team in the Edmonton or Calgary…
Added 25 days ago
Senior .NET Developer - Kafka
Tamanna Technology
Toronto, ON · Greater Toronto Area, Canada
Contract
We are seeking a highly skilled .NET C# developer with deep expertise in Kafka, modern .NET (Core/6/7+), and experience across frontend, cloud (Kubernetes), and DevOps. Experience with…
Added 21 days ago
Senior Technology Specialist, Core Systems Developer
Equitable
Waterloo, ON
Prominent level of proficiency in .NET/C#, and at least 5+ years of experience
Added 25 days ago
Dotnet Developer
Kumaran Systems
Toronto, ON · Greater Toronto Area, Canada
Full-time
Seeking a highly skilled Senior .NET Full Stack Developer with 7–10 years of strong expertise in C#, .NET technologies, SQL Server, Angular, and Azure Cloud services. The ideal candidate…
Added 25 days ago
Business Systems & Technology Lead - Manufacturing
Robertson & Company Ltd.
Uxbridge, ON
Full-time
Strong hands-on development experience using C#, .NET, Python, Java, C++ or comparable technologies.
Added 26 days ago
Senior GIS Developer, Federal Sector Services
Esri Canada
Ottawa, ON
Full-time
A Day in the Life of a Senior GIS Developer at Esri Canada:

TechDoQuest

Sr. Windows API & Browser Extension Developer

Brampton, ON, Canada

Pay: $55 to $63 CAD / hour
Job type: Contract
Apply by: Sep 26, 2026
Experience: 8+ years of Software Development experience.
Posting language: English
Posted: Aug 27, 2026

Apply About employer

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Original job description

This job posting is for an existing, active vacancy and we are looking to hire Sr. Windows API & Browser Extension Developer at Brampton, ON (100% onsite).

Job Description:

Role Overview

We are seeking an experienced Senior Windows API & Browser Extension Developer to design, develop, and implement a secure Windows-based integration solution for a standalone enterprise environment. The solution will capture user-submitted data from a web portal through a Microsoft Edge browser extension and securely integrate it with downstream REST APIs using Windows Native Messaging or a locally hosted Windows service.

The role requires hands-on experience in Windows application development, browser extension development, API integration, security engineering, and enterprise-grade software delivery.

Key Responsibilities – Senior Windows API & Edge Extension Developer

Design, develop, and deploy a secure Microsoft Edge (Chromium) browser extension for automated data capture and API integration workflows.
Develop Windows-based integration components using C#, .NET Core, Windows Services, Win32 APIs, and Windows Native Messaging.
Build and integrate secure REST APIs with support for API Keys, TLS/mTLS, certificate-based authentication, and secure communications.
Design solutions to process sensitive business data entirely in memory, ensuring no transaction data is written to disk, logs, or diagnostic files.
Implement robust error handling, retry mechanisms, timeout controls, status tracking, and resilience patterns for API interactions.
Develop and support multi-user Windows Server / Terminal Services environments supporting concurrent user sessions.
Configure and manage Windows security components including Certificate Store, DPAPI, service accounts, access controls, and secure secret management.
Perform unit testing, integration testing, API testing, browser extension testing, and end-to-end system validation.
Ensure compliance with Secure SDLC, secure coding standards, vulnerability scanning, code reviews, and security remediation requirements.
Create and maintain HLD, LLD, deployment guides, operational runbooks, support documentation, and knowledge transfer materials.
Collaborate with customer architects, security teams, infrastructure teams, and project stakeholders throughout the project lifecycle.
Support deployment, production stabilization, warranty support, troubleshooting, and defect resolution activities.
Package and deliver signed release artifacts, installation binaries, and deployment documentation for Windows Server environments.

Mandatory Skills

Windows Server 2019/2022 Administration & Development (Mandatory)
Windows Terminal Services (RDS) Environment Management
C#, .NET Core / ASP.NET Core
Windows API / Win32 Development
Microsoft Edge Extension Development (Manifest V3)
Windows Native Messaging
REST API Development & Integration
TLS / mTLS / Certificate Management
Windows Security, DPAPI, Certificate Store
Secure SDLC & OWASP Secure Coding
Git/GitHub, CI/CD and Release Management
Unit, Integration and End-to-End Testing

Experience

8+ years of Software Development experience.
5+ years of Windows Server, Windows Platform and .NET Development.
3+ years of Browser Extension and API Integration Development.
Experience delivering secure enterprise solutions in Windows Server environments.
Strong troubleshooting, documentation, and customer-facing communication skills.

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More about this job

Responsibilities

Design and develop a secure Microsoft Edge browser extension and Windows-based integration components to capture web portal data. Implement secure REST API integrations and manage Windows security components within a Terminal Services environment.

Requirements

Requires over 8 years of software development experience, with specific expertise in .NET, Windows Server, and browser extension development. Must be proficient in secure coding standards, certificate management, and enterprise-grade Windows application delivery.

Skills

C#
.NET Core
Windows API
Win32
Windows Native Messaging
REST API
TLS/mTLS
Windows Server Administration
DPAPI
Secure SDLC
Git/GitHub

Visa sponsorship

Not detected in the job text

Keywords

C#
.NET Core
ASP.NET Core
Windows Server 2019
Windows Server 2022
Microsoft Edge
Manifest V3
Win32 API
Native Messaging
REST API
TLS
mTLS
Certificate Store
DPAPI
OWASP
Secure SDLC
CI/CD
GitHub
Terminal Services
RDS
Enterprise Software
Security Engineering
Unit Testing
Integration Testing
HLD
LLD
Windows Services
Vulnerability Scanning
IT Consulting
Software Development

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