Senior .NET developers, based in the US, working your hours
C# and .NET apps, APIs, and modernizations, built by US engineers who move old .NET Framework systems forward without downtime.
- Every engineer lives and works in the US
- Works your hours, joins your standups
- NDA and full IP assignment from day one
Book your call: tell us what you need
"NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag."
"Their R&D tax credit workflow platform paid for itself in the first filing season."
"AI-native from day one. Our IRS transcript pipeline runs 24/7 without a human in the loop."
"Property tax appeals used to take weeks. Their comp analysis tooling turned it into hours."
"The AI intake agent handles our tier-1 patient calls with a hand-off cleaner than our old call center."
"POS, inventory, ordering — all unified. We finally have one source of truth across every location."
"The procurement platform paid for itself in the first quarter of use."
"They shipped our matching engine in 6 weeks. Our old team would've taken 6 months."
"Enterprise-grade delivery without the enterprise-agency price tag."
"Their team plugged into our sprint on day one. Zero ramp time."
"NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag."
"Their R&D tax credit workflow platform paid for itself in the first filing season."
"AI-native from day one. Our IRS transcript pipeline runs 24/7 without a human in the loop."
"Property tax appeals used to take weeks. Their comp analysis tooling turned it into hours."
"The AI intake agent handles our tier-1 patient calls with a hand-off cleaner than our old call center."
"POS, inventory, ordering — all unified. We finally have one source of truth across every location."
"The procurement platform paid for itself in the first quarter of use."
"They shipped our matching engine in 6 weeks. Our old team would've taken 6 months."
"Enterprise-grade delivery without the enterprise-agency price tag."
"Their team plugged into our sprint on day one. Zero ramp time."
Sound familiar?
- Hiring a senior .NET developer full-time is taking months.
- Your .NET codebase has grown messy and every change breaks something else.
- Offshore hand-offs and time-zone gaps turn one-day fixes into week-long threads.
- You need someone senior enough to make decisions, not just close tickets.
What our .NET engineers build
C# APIs & services
ASP.NET Core APIs and services with tests and monitoring.
.NET Framework upgrades
Legacy .NET Framework apps moved to modern .NET safely.
SQL Server & Azure
Data access, reporting, and Azure deployments that hold up.
How it works
- 01
15-minute call
Tell us what you need built or fixed and where it's stuck.
- 02
Matched profiles
You meet US-based engineers with directly relevant work behind them.
- 03
You interview
Run your own technical interview. You only move forward with people you pick.
- 04
They start shipping
Onboarded into your repo, tools, and review process, with a weekly written update.
Hire US-based .NET developers for C# applications, ASP.NET Core APIs, and modernization of existing .NET Framework systems. Projects might involve ASP.NET Core 10 services, Entity Framework Core 10 data access, Blazor interfaces, or Windows desktop software using WPF. The right engineering plan depends on your runtime, Windows dependencies, database behavior, and whether the application can move incrementally rather than through a complete rewrite.
At NextGen Coding Company, engineers are senior, and many have more than ten years of experience. They live and work in the US, join your standups, and follow your working hours without offshore subcontracting. An NDA and full IP assignment come before code access. Book a 15-minute call to review your solution structure, hosting environment, and the responsibilities you need covered.
Frequently asked questions
- Can we migrate .NET Framework 4.8 to modern .NET incrementally?
- Often, yes, but the path depends on dependencies such as System.Web, Web Forms, WCF servers, and Windows-only libraries. Begin by inventorying projects and separating portable business logic from framework-specific code. Some applications can move endpoints gradually into ASP.NET Core, while others need targeted component replacement before a supported modern runtime becomes practical.
- Should a new ASP.NET Core application target .NET 10?
- .NET 10 is an LTS release and a reasonable starting point for new development when your hosting platform and dependencies support it. Check compatibility across NuGet packages, build agents, container images, and Entity Framework Core providers. An existing application should choose its upgrade timing around support requirements and tested dependency readiness.
- How can a .NET developer improve Entity Framework Core performance?
- Start by inspecting generated SQL and measuring database execution rather than assuming LINQ is the problem. Common fixes include projecting only needed columns, using AsNoTracking for appropriate reads, addressing N+1 access, and adding indexes based on query plans. Large result sets, split queries, and transaction boundaries each need workload-specific testing.
- Can a .NET engineer work with our Azure deployment pipeline?
- The scope can include ASP.NET Core deployment to Azure App Service or containers, with builds in Azure DevOps or GitHub Actions. Establish how managed identities, Key Vault references, database migrations, and health checks work today. Deployment changes should include observable startup behavior and a rollback plan appropriate to the application's data changes.
- How quickly can we interview a US-based .NET developer?
- Most teams interview matched engineers within a week of the first call. Share your C# version, target frameworks, database, and application type so the conversation addresses the right skills. An ASP.NET Core API role differs from WPF maintenance or .NET Framework migration; book a 15-minute call to define that scope.
- Are your developers really based in the US?
- Yes. Every engineer lives and works in the United States. No offshore subcontracting and no hand-offs to another team. That's written into the contract.
- How fast can someone start?
- Most teams interview matched engineers within a week of the first call. Start dates depend on your interview process.
Related reading
- How to hire a software developer
What to check before you sign.
- Hiring test for senior engineers
How to vet senior talent fast.
- Senior engineer salary guide 2026
What the market pays.
- Onshore vs offshore vs nearshore
The honest tradeoffs.
- Forward deployed engineers
Need an owner, not just capacity?
- Resource library
Every guide and benchmark we publish.
Start your project request
Tell us what you're building — engineering capacity, AI, QA, cloud, or a fixed-scope software engagement. Our NYC team responds within one business day.
- Response within 1 business day
- 30-minute discovery conversation
- Recommended engagement model & pricing
- NYC-focused — in-person available
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