Flexstaf I.T. Inc.

Senior Web Developer

Flexstaf I.T. Inc.  •  Toronto, CA (Onsite)  •  5 hours ago
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Job Description

We are seeking an experienced Web Services & Application Developer with strong C#, ASP.NET, and SQL Server capabilities to maintain, modernize, and enhance legacy web applications, REST services, and SOAP web services. In this role, you will bridge the gap between web application maintenance and backend service integration, ensuring system stability, building secure APIs, and optimizing complex database workflows.

Key Responsibilities

  • Application & API Development: Design, build, and maintain Web API services, REST Services, SOAP web services, and existing ASP.NET applications using C#, .NET Framework, HTML5, CSS3, JavaScript, and AJAX.
  • Service Integration & Modernization: Develop and consume RESTful APIs and SOAP/WCF web services to enable seamless integration across enterprise platforms and legacy architectures.
  • Backend Data Engineering: Write complex SQL queries, stored procedures, user-defined functions, triggers, and views in T-SQL, optimizing database performance and data exchange workflows.
  • Legacy Refactoring & Security: Identify performance bottlenecks in web applications and web services; refactor and optimize C# code and database scripts for performance, scalability, and security (e.g., OWASP compliance, SQL injection prevention).
  • System Support & Integration: Support system integration testing, debug web service communication, resolve production issues, and document technical architecture and API endpoints.

Required Qualifications

  • Experience: 5+ years of professional software development experience with C#, ASP.NET, Web Services, and Microsoft SQL Server.
  • Core Tech Stack: Deep proficiency in C#, ASP.NET, REST Services (Web API), and SOAP Services (WCF / ASMX), alongside front-end fundamentals (JavaScript, jQuery, HTML5, CSS3).
  • Web Services & API Design: Strong hands-on experience designing, consuming, and securing RESTful JSON endpoints and XML-based SOAP contracts (WSDL, XSD, SOAP envelopes).
  • T-SQL Mastery: Advanced skills in writing and optimizing complex T-SQL queries, stored procedures, execution plans, and database indexing to support service payloads.
  • Version Control: Experience with Git, Azure DevOps, or Team Foundation Server (TFS).

Preferred Qualifications

  • Experience migrating legacy ASP.NET applications and SOAP services to modern frameworks ( ASP.NET Core, RESTful microservices, Angular, or React).
  • Deep understanding of IIS server configuration, SSL/TLS certificates, and API security authentication models (OAuth 2.0, JWT, API Keys, Basic Auth).
  • Knowledge of cloud platforms (Azure Web Apps, Azure API Management, Azure SQL) or C# unit testing frameworks (xUnit, NUnit, Moq).
Flexstaf I.T. Inc.

About Flexstaf I.T. Inc.

Flexstaf IT is an Approved Vendor for The Ministry of Government Services, Task - Based Information and Information Technology (I&IT) Services - VOR # OSS - 00430429. FlexStaf I.T. is a Canadian based organization specializing in providing various organizations across all industries, the best qualified I.T. personnel for short or long term contract assignments, permanent placement positions, or fully managed end to end I.T. project solutions. Specialized I.T. professionals include resources skilled in Application Development, Infrastructure Support, Business Analysis, Quality Assurance, Management and Senior Executive level, from all I.T. technical domains.

With 17 years of I.T. Sales Management and Recruitment experience, our management team's strength include the instinct to deliver professional candidates to respective employers efficiently, effectively and most importantly, successfully ensuring complete satisfaction.

"Flexible people, delivering flexible solutions"​

Industry
IT & Software
Company Size
1-10 employees
Headquarters
Whitby, CA
Year Founded
Unknown
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