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Added 10 mins ago
S
Senior Software Engineer, Backend - Fraud Prevention
Sardine
Remote, Canada
- $180,000 to $206,000 CAD / year
- Full-time
- Remote
As a backend-focused Senior Software Engineer, you will play a pivotal role in designing, constructing, and maintaining APIs, services, and systems across our engineering team. This…
Added 26 mins ago
KI
Senior Project Manager
KAPP Infrastructure Inc.
Vaughan, ON
- $120,000 to $160,000 CAD / year
- Full-time
We are seeking a qualified and motivated individual to join our Vaughan-based team as a Senior Project Manager. This is an opportunity to join a company with over 40 years of construction…
Added 41 mins ago
M
Staff Software Engineer, AI
Maple
Toronto, ON
- Full-time
This is a hands-on, senior individual contributor role for an engineer who has spent the last few years actively building AI into real products - not just experimenting with models or…
Added 41 mins ago
Senior Engineer, Geotechnical
Elk Valley Resources
Calgary, AB · Sparwood, BC
Reporting to the Manager, Geological Engineering, the Senior Engineer, Geotechnical is responsible for:
Added 41 mins ago
W
Senior Electrical Engineer
WSP
Thornhill, ON
- Full-time
Join our Buildings M&E team as a Senior Electrical Engineer and help shape electrical solutions for diverse projects across Canada. Based in Thornhill/Markham (GTA), you’ll bring…
Added 41 mins ago
W
Senior Mechanical Engineer, Buildings
WSP
Thornhill, ON
- Full-time
Strengthen design quality by participating in internal QA/QC processes and technical reviews, including reviewing and sealing peer-prepared materials where appropriate.
Added 56 mins ago
C
Java Software Engineer
Collabera
Mississauga, ON
- $65 to $80 USD / hour
- Full-time
We are looking for a Senior Java Developer with 5 to 10+ years of experience in Java development. The candidate should have strong experience building distributed, service-oriented,…
Added 56 mins ago
EV
Senior Engineer, Geotechnical
Elk Valley Resources
Sparwood, BC
- Full-time
Reporting to the Manager, Geological Engineering, the Senior Engineer, Geotechnical is responsible for:
Added 56 mins ago
V
Senior Full Stack Engineer
Viamo
Remote, Canada
- $100,000 to $140,000 CAD / year
- Full-time
- Remote
We are looking for a Senior Full Stack Engineer to join our growing, multinational team of engineers. We work passionately to improve the quality of life for people in lower and middle…
Added 1 hour ago
H
Senior Prototype Engineer
Humanoid
Burnaby, BC
- Full-time
We are looking for a Senior Prototype Engineer to drive the development, assembly, integration, and validation of advanced humanoid robotic systems, with a particular focus on robotic…
Added 1 hour ago
HS
Senior Java Software Engineer
Henry Schein One Canada
Surrey, BC
- Full-time
We are looking for a Senior Software Engineer to join our True North team and help build and evolve Dentrix Ascend for the US market.
Added 1 hour ago
K
Senior Project Manager - NET
Kinectrics
Toronto, ON
- Contract
Diversity: The company is dedicated to promoting diversity in its workforce, up to and including the senior management level. Our diversity committee ensures we stay up to date on leading…
Added 1 hour ago
FL
Senior Software Engineer - .NET, C# & APIs
Flexkube Lab Inc.
Toronto, ON · Greater Toronto Area, Canada
- Contract
We are looking for an experienced, hands-on engineer who brings strong backend development capabilities, an understanding of modern frontend frameworks, and experience delivering secure,…
Added 1 hour ago
FT
Power Electronics Engineer
Foreseeson Technology
Richmond, BC
- Contract
Collaborate with the Senior Electrical Engineer and Embedded Systems Engineer to define converter interfaces, control signals, telemetry, and fault-handling requirements.
Added 1 hour ago
Senior Application Engineer
Eclipse Automation
Cambridge, ON
Job Title: Account Manager - Applications Engineer
Added 1 hour ago
C
Sr. Database Automation Engineer
CIBC
Toronto, ON
- Full-time
…secure platforms that support critical enterprise services. As a senior-level database automation professional, you’ll provide operational support for automation platforms such as Ansible…
Added 1 hour ago
N
Sr. Software Engineer
Nascent
Toronto, ON
- Full-time
We’re looking for a Senior Software Engineer who owns the work from idea to production; someone who sees what needs to be built, figures out the best way to build it, and makes it happen.…
Added 1 hour ago
KG
Manager, TMF and Earthworks Area
Kinross Gold Corporation
Red Lake, ON
- Full-time
Review designs, drawings, work packages, changes, and technical queries; coordinate constructability, geotechnical, quality, regulatory, and Engineer of Record matters.
Added 1 hour ago
EI
Senior Project Engineer
ExcelGens, Inc.
Montreal, QC
- Contract
We are seeking an experienced Senior Project Engineer – Montreal Delivery (Principal Advisor Engineering) to strengthen the Vaudreuil Program's engineering delivery capacity and support the…
Added 1 hour ago
B
Senior Mechanical Building Engineer
BPA
Ottawa, ON
- Full-time
BPA is seeking a Senior Mechanical Building Engineer to join our multidisciplinary team and contribute to the delivery of innovative building projects across a variety of sectors. We are…
Added 1 hour ago
G
Senior Quality Assurance Automation Engineer
GryphTech
Mississauga, ON
- Full-time
We are looking for a QA Engineer to join our quality assurance team and help us validate high-quality, reliable web applications.
Added 1 hour ago
TS
Mechanical Designer / Engineer
TalentSphere Staffing Solutions
AB · Edmonton, AB
- Full-time
Manage assigned design tasks and deadlines while maintaining drawing accuracy and project quality.
Added 1 hour ago
G
Building Science Engineer
Go2STAFFING
Vaughan, ON
- Full-time
firm in Vaughan to recruit a Building Science Engineer with strong
Added 1 hour ago
M
RQ11740 - DevOPS/Cloud Engineer - Senior
Maarut
Toronto, ON
- Contract
and operational teams, the Senior DevOps Engineer improves deployment
Added 2 hours ago
H
Senior Software Engineer, Core Product (Hybrid)
Homebase
Remote, Canada
- $130,000 to $200,000 CAD / year
- Full-time
- Remote
As a Senior Software Engineer on the Core Product team, you’ll build the products small business owners rely on every single day: Scheduling, HR Management (HRM), and Payroll. This is where…

Flexkube Lab Inc.

Senior Software Engineer - .NET, C# & APIs

Toronto, ON, Canada
Greater Toronto Area, Canada, Canada

Contract

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Job details

Job type: Contract
Apply by: Nov 25, 2026
Experience: 8+ years of professional software engineering experience, with strong hands-on development expertise in C# and .NET.
Posting language: English
Posted: Oct 26, 2026

Original job description

In this role, you will design, develop, modernize, and maintain enterprise applications and APIs that support business-critical solutions for our clients.

We are looking for an experienced, hands-on engineer who brings strong backend development capabilities, an understanding of modern frontend frameworks, and experience delivering secure, scalable, and reliable software.

You will collaborate with cross-functional engineering teams, contribute to technical design decisions, and leverage modern development practices, including AI-assisted engineering tools, to improve software quality and delivery efficiency.

Why This Role Is Open

We are currently hiring for this role due to an existing or newly created vacancy within our organization. This position is open as part of our ongoing business needs, and we are actively reviewing applications to fill this role with a qualified candidate who can make an immediate impact.

What You’ll Do

Design, develop, and maintain scalable backend services and enterprise applications using C#, .NET, ASP.NET Core, and SQL Server.
Build, enhance, and integrate secure RESTful APIs, including authentication, authorization, data validation, and error handling.
Contribute to the modernization of existing applications, including refactoring legacy code, improving performance, and enhancing system reliability.
Work across the application stack, collaborating on frontend development using React, Angular, or similar JavaScript/TypeScript frameworks.
Apply secure coding principles and API security practices, including OAuth2, JWT, and common application security standards.
Participate in technical design discussions, code reviews, automated testing, troubleshooting, and performance optimization.
Support CI/CD pipelines, containerized deployments, and development workflows using tools such as Docker.
Collaborate with engineers, product teams, and quality specialists to deliver high-quality solutions in Agile environments.
Leverage AI-assisted development tools responsibly to support coding, testing, debugging, and documentation while maintaining security and engineering standards.
Share technical knowledge and contribute to continuous improvements in development practices and software quality.

What We’re Looking For

8+ years of professional software engineering experience, with strong hands-on development expertise in C# and .NET.
Solid experience building and maintaining applications using ASP.NET Core, Web API, and RESTful services.
Strong understanding of backend architecture, API design, system integrations, and object-oriented programming principles.
Experience working with SQL Server or comparable relational databases, including data access technologies such as Entity Framework Core or Dapper.
Experience with modern frontend development using React, Angular, or similar JavaScript/TypeScript frameworks.
Understanding of application security principles, including authentication, authorization, OAuth2, JWT, and secure coding practices.
Experience working with Git, code reviews, automated testing, CI/CD pipelines, and Agile software delivery.
Strong problem-solving and troubleshooting skills, with the ability to investigate and resolve complex technical issues.
Ability to collaborate effectively with cross-functional teams and communicate technical concepts clearly.

Bonus Points For

Experience modernizing legacy .NET applications or migrating enterprise systems to modern architectures.
Exposure to Azure or AWS cloud environments, Docker, Kubernetes, or cloud deployment troubleshooting.
Experience with performance optimization, application monitoring, and production support.
Familiarity with accessibility standards such as WCAG or AODA.
Experience with Snowflake, data warehouses, or enterprise data integrations.
Experience with Tailwind CSS, shadcn/ui, or other modern frontend component libraries.
Experience using AI-assisted software development tools such as GitHub Copilot, ChatGPT, or other AI-powered coding and testing solutions.
Experience mentoring developers, contributing to technical documentation, or improving engineering standards.

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More about this job

Responsibilities

Design, develop, modernize, and maintain enterprise applications and secure, scalable APIs using C#, .NET, ASP.NET Core, and SQL Server. Collaborate across engineering and product teams on frontend work, security, testing, CI/CD, troubleshooting, performance improvements, and responsible use of AI-assisted development tools.

Requirements

Requires 8+ years of software engineering experience and strong hands-on expertise in C# and .NET, including ASP.NET Core, Web API, RESTful services, backend architecture, and relational databases. Candidates should also have frontend framework experience, knowledge of application security, and experience with Git, code reviews, automated testing, CI/CD, and Agile delivery.

Skills

C#
.NET
ASP.NET Core
RESTful APIs
SQL Server
Entity Framework Core
Dapper
React
Angular
OAuth2
JWT
Docker
CI/CD
Automated Testing
Agile
Application Security

Visa sponsorship

Not detected in the job text

Keywords

C#
.NET
ASP.NET Core
Web API
RESTful APIs
SQL Server
Entity Framework Core
Dapper
React
Angular
JavaScript
TypeScript
OAuth2
JWT
Git
Code Reviews
Automated Testing
CI/CD
Docker
Kubernetes
Azure
AWS
Agile
Legacy Application Modernization
Performance Optimization
Application Monitoring
Snowflake
WCAG
Tailwind CSS
GitHub Copilot

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