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Hire C# / .NET Developers
Kultrix C# and .NET developers build robust enterprise web applications, APIs, and desktop software that scale under real-world load.
Start in 1-2 Weeks
Senior Engineers Only
7+ Years Experience
NDA

HIRE WITH US
Kultrix C# and .NET developers build robust enterprise web applications, APIs, and desktop software that scale under real-world load.
Start in 1-2 Weeks
Senior Engineers Only
7+ Years Experience
NDA

EXPERTISE
WHAT WE DO
We design and build RESTful and gRPC APIs with ASP.NET Core, following clean-architecture principles, proper versioning, and OpenAPI documentation so downstream teams integrate without friction.
We build interactive web UIs using Blazor Server and Blazor WebAssembly, delivering rich single-page experiences without leaving the .NET ecosystem or hiring a separate JavaScript team.
We model relational data with SQL Server or PostgreSQL, manage migrations through Entity Framework, and tune queries, indexes, and execution plans to keep response times under control at scale.
We deploy .NET workloads to Azure App Service, Azure Functions, and AKS, configure pipelines in Azure DevOps, and enforce security through Managed Identity and Key Vault.
We migrate .NET Framework applications to .NET 8, refactor monoliths into modular services, and introduce dependency injection and unit testing to legacy codebases safely.
We connect .NET systems to ERP platforms, payment gateways, and third-party APIs using service clients, message queues, and retry-resilient HTTP patterns with Polly.
WHO THIS IS FOR
Whether you are a startup or enterprise, we have the right engagement for you.
Fast-track your MVP with senior talent. Launch on time and within budget.
Improve performance, UX, and features of your existing product with expert help.
Augment your team with senior specialists to accelerate feature delivery.
OUR APPROACH
Choose the cooperation format that best fits your business goals and development velocity.
Fast launch to test your idea and gather user feedback with minimal investment.
What's included
Timeline Typically 9-16 weeks
Complete cycle from initial strategy and design to final launch.
What's included
Timeline Typically 20-40 weeks
Scale your team with expert developers to accelerate development.
What's included
Timeline Flexible / Long-term
OUR HIRING PROCESS
Tell us about your project goals, timeline, and team needs. We'll set up a free consultation to dive deeper into your requirements.
Based on your project, we recommend the ideal team structure, engagement model, and technology approach - tailored to your goals and budget.
We handpick the best-fit professionals from our senior talent pool. You'll meet them, review their experience, and give the green light.
Your team onboards within 48 hours. We align on workflows, set up communication, and start delivering results from week one.
As your project evolves, we scale your team, add new specialists, or adjust scope - all within your existing partnership.
INDUSTRIES
Our C# Developer professionals build solutions across various sectors.
Data-driven commerce solutions that improve journeys, boost sales, and optimize operations.
Data-driven commerce solutions that improve journeys, increase sales, and optimize operations.
Reliable medical platforms that protect patient data, simplify workflows, and support clinical accuracy.
Product-driven platforms that enhance workflows, automate processes, and scale with your business.





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Expert professionals ready to join your team and deliver results.
CASE STUDIES
Testimonials
What impressed us most was how Kultrix handled the full stack - frontend, backend, and mobile - with one cohesive team. Communication was clear, delivery was predictable, and the final product exceeded what we initially scoped.
Co-CEO
Kultrix built both our web platform and mobile app from scratch. Their team understood the complexity of our industrial workflows and translated them into clean, intuitive interfaces. We launched on time and our operators adopted the tools immediately.
Co-CEO
Kultrix handled everything for us - landing page, dashboard, mobile app, and even a Chrome extension. Having one team own the entire product surface meant everything felt connected and consistent. They shipped fast and the quality speaks for itself.
CEO, Ping Proxies
Kultrix has been our go-to partner for multiple projects - from marketing websites to full mobile applications and backend systems. They scale up when we need speed and maintain consistency across every project. Reliable, fast, and technically strong.
CEO, Volume Apps
Working with Kultrix on our mobile app and backend was seamless. They brought strong product thinking to every sprint, not just code. When priorities shifted, they adapted quickly without losing momentum. Exactly the kind of partner a product team needs.
Product Lead, Pelago
We needed a team that could handle mobile development, server infrastructure, and AI features all at once. Kultrix delivered on all three fronts. Our fitness platform went from concept to production in under four months with zero compromises on quality.
CEO, Fitblast

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FAQ
C# is the programming language; .NET is the runtime and framework ecosystem. In practice, the terms are used interchangeably - all Kultrix .NET developers write C# and work across the full .NET stack including ASP.NET Core, Entity Framework, and the Azure SDK. When we say C# developer, we mean someone fluent in the complete Microsoft backend platform.
Most Kultrix engagements begin within 48 hours of contract signing. We maintain a bench of vetted senior .NET developers available for immediate placement. For larger teams or highly specialised requirements such as Blazor or Azure Service Fabric, a one-week lead time is typical.
Yes - joining a live codebase is standard practice for Kultrix developers. They begin with a code review, map dependencies, identify technical debt, and align with your architecture before writing their first PR. Productive contribution typically begins within the first sprint.
Absolutely. We have completed multiple .NET Framework to .NET 8 migrations, including projects using Web Forms, WCF, and ASMX web services. We assess compatibility, prioritise the migration path, automate what can be automated, and rewrite what cannot be safely ported. Migrations are done incrementally to minimise delivery risk.
Our .NET developers are fluent across Azure App Service, Azure Functions, Azure Service Bus, Azure SQL, Cosmos DB, Blob Storage, AKS, and Azure DevOps pipelines. We apply Managed Identity throughout to eliminate hard-coded secrets, and use Key Vault for configuration management.
Testing is not optional at Kultrix. Our developers write xUnit tests for business logic, use Moq or NSubstitute for mocking, and set up integration tests against a real database using TestContainers. Coverage gates are configured in CI so regressions are caught before they reach production.
Yes. Fixed-scope engagements such as building an API, migrating a database, or implementing a payment integration are scoped after a discovery call and quoted with a fixed price and timeline. Changes are handled through a straightforward change-order process that keeps delivery on track.
All Kultrix .NET developers are mid-to-senior level with a minimum of four years of professional C# experience. Every developer passes a technical interview covering OOP design, async patterns, and SQL before joining our bench. We do not place juniors on client engagements.
We offer monthly retainer and time-and-materials models. Retainer engagements include a fixed allocation of developer hours with a guaranteed response SLA. T&M engagements are billed weekly against tracked hours. Both models include transparent timesheets and a dedicated account manager.
Yes. Kultrix developers structure .NET projects using clean or onion architecture, separating domain, application, infrastructure, and presentation concerns. This makes the codebase easier to test, easier to extend, and easier for new team members to navigate from day one.
Yes. We have experience with both Blazor Server and Blazor WebAssembly, including authentication with MSAL, state management with Fluxor, and publishing optimised WASM bundles. If your team wants to avoid a JavaScript frontend while keeping rich interactivity, Blazor WebAssembly is a strong choice and we can lead that implementation.
Kultrix is a product-focused agency, not a talent marketplace. Every developer is a Kultrix employee or long-term contractor - not an anonymous profile. We manage quality, handle replacements if a fit is not working, and provide a dedicated account manager. You get the flexibility of a freelancer with the accountability of an agency.