Senior .NET Developer

Job title: Senior .NET Developer

Job type: Contract

Contract Length: 6 months

Rate: $25 – $30 USD per hour ($4,333 – $5,200 USD per month)

Role Location: 100% Remote (Argentina)

This is a remote contract for our US-based client. The contractor works from Argentina for a US team. The team operates in English as their working language; Professional Fluency in English (minimum) is required.

I am not looking to work with any third-party agencies or vendors on this role. Seriously guys, please don't call me. Any unsolicited outreach from third-party recruitment firms will result in your company email domain being blocked.

The Company An established US-based aerospace technology company — one of our agency's longer-standing clients. The work supports a mission-critical operational platform.

Role And Responsibilities Maintaining and modernising a mission-critical .NET application — a mixed VB.NET and C# codebase running on IIS / Windows Server, with integrations across SQL Server, Azure DevOps, SharePoint, Excel VBA macros, Power Automate, and BI tools. A partial VB.NET to C# migration is in progress. There is a hard deadline tied to a live operational milestone — it does not move.

• Maintain and extend the existing VB.NET and C# codebase
• Continue the partial VB.NET to C# migration pragmatically — modernise where it matters, leave what's stable alone
• Build and optimise SQL Server queries, stored procedures, and integrations
• Deliver against a hard deadline with minimal onboarding

Job Requirements

• 8+ years .NET experience — BOTH VB.NET and C# required, this is non-negotiable
• Current VB.NET use within the last 12 months — primary screen, no exceptions
• Pragmatic with legacy codebases — knows what to modernise vs what to leave alone
• Strong SQL Server: queries, stored procedures, optimisation

Nice To Have

• Prior experience working alongside teams based in the US, Canada, or Europe
• Prior partial-migration or modernisation project experience
• Mission-critical or safety-sensitive application background

Please note we are unable to offer employer sponsorship for this role.

Accessibility Statement We make an active choice to be inclusive towards everyone every day. Please let us know if you require any accessibility adjustments through the application or interview process.

Our Commitment To Diversity, Equity, And Inclusion Signify's mission is to empower every person, regardless of their background or circumstances, with an equitable chance to achieve the careers they deserve. Building a diverse future, one placement at a time.

Check out our DE&I page here: https://www.signifytechnology.com/diversity-and-inclusion/