Senior Fullstack Developer; C#​/React), Migrate - ShareGate

About Share Gate

Share Gate is the leading Microsoft 365 migration and governance platform, trusted by over 100,000 IT pros for its unmatched simplicity.

It offers the simplest, most reliable, and most affordable way to move business data to Microsoft 365.

Whether migrating from Google Workspace, file shares, Exchange Online, SharePoint On-Premises, or tenant-to-tenant, Share Gate gets the job done, without surprises. From cloud transformation to M&A integration, it keeps things just damn simple.

Share Gate also helps organizations stay in control once their data is migrated. Its powerful governance features let users assess environments, uncover issues, and apply fixes on the spot, so everything stays clean, secure, and optimized. It lays the groundwork for safe Microsoft Copilot deployment within organizations.

Share Gate is developed by Workleap Technologies, a Montréal‑based software company.

As Senior Software Developer, you'll play a key role in building the new Share Gate Migrate web application. With strong React, C# and Type Script expertise, you'll contribute across the full stack and collaborate closely with the product team to turn user needs into simple, well‑crafted experiences. In this fast‑moving squad, you'll thrive on quality, technical judgment, and continuous learning.

Your impact:

• Ship full‑stack features that meet quality, performance, and UX standards from the first milestones of the new web app.
• Shape the team's technical choices (libraries, API patterns, code structure, test strategy) so each decision accelerates future delivery rather than adding weight.
• Translate user needs into shipped experiences that solve the real problem, in tight partnership with Product and Design.
• Integrate Microsoft APIs (Microsoft Graph, Azure AD / Entra , MSAL) reliably and securely so migration and authentication scenarios work without friction in production.
• Anticipate technical risks before they block the team, and bring concrete solutions that keep delivery moving.
• Raise the team's technical bar through code reviews and mentoring that make others grow, not just validate code.
• Master AI‑assisted development tools (such as Claude and Git Hub Copilot) to deliver a level of quality and output that a solo dev couldn't achieve otherwise.

• You’ll join the Web Experience team, a cross‑functional squad made up of developers, a Product Manager, and a Product Designer. The team is part of the Share Gate Migrate department, a collaborative network of teams with access to staff developers for technical guidance and cross‑team alignment.
• The team is starting an almost greenfield project, which means a strong culture of autonomy and collective decision‑making from the very beginning. A senior developer is expected to have a visible impact not just on what gets shipped, but on how the team works and decides. AI‑assisted development is a core part of how the team operates. Deep familiarity with these tools and the ability to get the most out of them are expected.
• The next challenges awaiting the team:
  • Building the new Share Gate Migrate web application from scratch, laying technical foundations that hold up at scale.
  • Bringing Share Gate's migration capabilities (sites, identities, content) into a fully web‑based experience, with the performance and reliability constraints that entails.
  • Establishing reusable technical patterns that will accelerate the development of each new feature over time.
• The stack:
  Type Script, React, and C# / .NET, with Microsoft APIs (Microsoft Graph, Azure AD / Entra , MSAL) and AI coding tools (Claude, Git Hub Copilot) at the center of the day‑to‑day.

• 5–10 years of experience in software development, ideally in a product‑oriented environment;
• Strong…