We're looking for an Application (.NET) Developer & IT Support Analyst to join our client's IT team in a hands‑on role that combines .NET development, SQL, application support, and IT support .

You'll develop and maintain internal business applications, troubleshoot SQL and application issues, and provide hands‑on technical support for employees across Canada and the United States.

This is a great fit for a developer who enjoys variety, is confident with basic SQL , and is comfortable troubleshooting both applications and everyday hardware/software issues.

Who You Are

A hands‑on developer who enjoys troubleshooting and problem‑solving

Confident writing basic SQL queries from scratch

Comfortable working across application development, application support, and IT troubleshooting

Someone who enjoys understanding how systems work together and finding the root cause of an issue

Comfortable working directly with both technical and non‑technical users

Patient and service‑oriented when helping users resolve technical issues

Resourceful and willing to jump into different types of technical problems

Able to work independently and take ownership of issues through to resolution

Location: Markham, ON (Fully Onsite - 5 days a week in‑office)

Vacancy Type: This role reflects an existing vacancy

What You’ll Do

Support and maintain a portfolio of custom business applications used across the organization

Troubleshoot application issues, bugs, and system integrations

Write, modify, and troubleshoot complex SQL queries and stored procedures

Investigate issues across multiple integrated systems, including ERP and custom web applications

Develop enhancements and improvements using C#/.NET and Visual Studio

Work directly with employees to understand technical issues and provide practical solutions

Support business users through phone, email, and remote support tools

Assist with application deployments, upgrades, and modernization initiatives





Collaborate with vendors and internal stakeholders to resolve application issues

Provide occasional support for office hardware, printers, mobile devices, and sales technology when needed

Recommend improvements to existing applications, reporting tools, and business processes

What We’re Looking For

3-5+ years supporting business applications in a Microsoft environment, ideally as a software developer, application support or hybrid development/support role

Strong experience with SQL Server, including writing and troubleshooting queries and stored procedures

Experience working with C#/.NET applications

Experience with Microsoft Visual Studio

Excellent troubleshooting and analytical skills

Strong communication skills with both technical and non‑technical usersComfortable supporting multiple applications simultaneously

Ability to work independently and take ownership of issues through resolution

Solid customer service mindset and willingness to help wherever needed

Comfortable working in a role that combines application support, development, and business user interaction

Nice‑to‑Have

Experience with REST APIs and system integrations

Experience with Angular or other modern web technologies

Experience supporting warehouse, sales, or distribution environments

Exposure to POS systems or label printing software

Paid Time Off: Competitive vacation and personal days to maintain a healthy work‑life balance

Health Benefits: Comprehensive benefits package with coverage to support your individual and/or family needs

Career Growth: Opportunity to work alongside an experienced developer while contributing to modernization initiatives and learning new technologies

We're proud to support diversity and inclusion. Need accommodation during the hiring process? Just let us know—we’re here to support you!

AI Use Disclosure:
STACK IT uses AI‑enhanced tools to support initial candidate screening and interview note analysis. All assessments and hiring decisions remain human‑led.

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📌 Application Developer & IT Support Analyst (Ontario)
🏢 STACK IT Recruitment
📍 Ontario