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Senior Web Developer Jobs in Innisfil, ON (NOW HIRING)

Flexstaf IT

Senior Web Developer

Toronto, ON

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 ...

Pinterest

Sr. Software Engineer, Web

Toronto, ON · On-site +1

At Pinterest, we're seeking curious, versatile Web Engineers to join our Product Engineering teams. You'll work closely with product managers, designers, and backend engineers to continuously push ...

Reason One

Senior Fullstack Developer

Toronto, ON · Remote

CA$120K - CA$145K/yr

... web applications, websites and components. * Document application architecture, development ... Provide senior-level support to developers on your team through mentoring and helping them debug ...

Targeted Talent

Senior Java Developer

Toronto, ON · On-site +1

$91K - $120K/yr

Are you a Senior Java Developer who loves working with cutting-edge technologies and solving ... Develop and consume RESTful web services using standard protocols and formats. * Understand the ...

Targeted Talent

Senior Java Developer

Toronto, ON · On-site +1

$91K - $120K/yr

Are you a Senior Java Developer who loves working with cutting-edge technologies and solving ... Develop and consume RESTful web services using standard protocols and formats. * Understand the ...

Whiskey Library

Senior Frontend Developer

Toronto, ON · Remote

Senior Frontend Developer We're looking for a Senior Frontend Developer to build and scale the ... This role is responsible for delivering fast, intuitive, and high-quality web experiences that help ...

Cority Software

Sr. Software Developer

Toronto, ON · On-site

Cority is looking for a Sr. Software Developer to be a part of our existing team. We are very ... Knowledge of Web development software including .Net and C# * Experience in the development of ...

Cority Software

Sr. Software Developer

Toronto, ON · On-site

Cority is looking for a Sr. Software Developer to be a part of our existing team. We are very ... Knowledge of Web development software including .Net and C# * Experience in the development of ...

Hootsuite

Senior Salesforce Developer

Toronto, ON · Remote

In the role of Senior Salesforce Developer, you will play a pivotal role within the Business ... Build solutions in Salesforce.com leveraging Force.com, APEX, Lightning Web Components, Web ...

Bentley Systems

Senior Software Developer

Toronto, ON · On-site

Role A Senior Software Developer, Subsurface Information Management is responsible for the end-to ... Design and architect complex software applications, components and web services with the ability to ...

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Senior Web Developer information

What is a senior web developer?

A senior web developer is a highly skilled computer coding professional with fluency in languages such as HTML, JavaScript, and CSS. In this career, your responsibilities include designing, developing, and debugging the backend of software programs for websites, applications, tools, and databases. You also work with JavaScript frameworks, develop tests using testing frameworks, help build and deploy automation scripts, troubleshoot, and resolve app performance issues. As a senior web developer, you may supervise a team of developers and collaborate with user experience designers to determine what the frontend user experience and website layout will look like during the design phase. Other duties may include enforcing coding standards, reviewing the work completed by your team, managing the budget and project schedule, and communicating directly with clients.

What are the key skills and qualifications needed to thrive as a senior web developer, and why are they important?

To thrive as a Senior Web Developer, you need advanced proficiency in programming languages like JavaScript, HTML, CSS, and backend frameworks, supported by a bachelor’s degree in computer science or equivalent experience. Expertise in tools such as version control (Git), CI/CD pipelines, and knowledge of modern frameworks (React, Angular, Node.js) are typically required, along with relevant certifications. Strong problem-solving ability, effective communication, and leadership skills help you collaborate across teams and mentor junior developers. These competencies ensure high-quality, scalable web solutions and support successful project delivery in dynamic development environments.

What are some common challenges faced by senior web developers when leading project teams?

Senior Web Developers often encounter challenges such as balancing hands-on coding responsibilities with mentoring junior team members and ensuring project deadlines are met. They must also navigate evolving technologies and frameworks, which requires ongoing learning and adaptability. Effective communication with designers, backend developers, and project managers is essential to align technical solutions with business goals. Successfully managing these aspects leads to smoother project delivery and professional growth.

What is the difference between Senior Web Developer vs Web Developer?

AspectSenior Web DeveloperWeb Developer
Required CredentialsBachelor's in CS or related, experience, possibly certificationsBachelor's in CS or related, entry-level or junior experience
Work EnvironmentCollaborates on complex projects, mentors juniorsDevelops websites, learns on the job, less responsibility
Employer & Industry UsageTech companies, agencies, startupsSmall businesses, startups, freelance projects
Search & Comparison IntentUnderstanding senior roles, career progressionEntry-level, learning web development

The main difference between a Senior Web Developer and a Web Developer lies in experience, responsibilities, and expertise. Senior Web Developers handle complex projects, mentor team members, and often have more advanced skills and certifications. Web Developers are typically entry-level or junior roles focused on building websites and gaining experience. Both roles are essential in the tech industry, but the senior position involves greater leadership and technical depth.

More about Senior Web Developer jobs

What are the most commonly searched types of Web Developer jobs in Innisfil, ON?

The most popular types of Web Developer jobs in Innisfil, ON are:

What are popular job titles related to Senior Web Developer jobs in Innisfil, ON?

For Senior Web Developer jobs in Innisfil, ON, the most frequently searched job titles are:

What cities near Innisfil, ON are hiring for Senior Web Developer jobs?

Cities near Innisfil, ON with the most Senior Web Developer job openings:

Senior Web Developer jobs near you
Infographic showing various Senior Web Developer job openings in Innisfil, ON as of August 2026, with employment types broken down into 80% Full Time, 13% Part Time, 1% Temporary, and 6% Contract. Highlights an 84% Physical, 4% Hybrid, and 12% Remote job distribution.

Senior Web Developer

Flexstaf IT

Toronto, ON

Full-time

Posted 8 days ago

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)