The most impressive trait about the Jelvix team is that you can't give them a task or idea too large. No matter how grand a vision you may have, they'll always have a solution or means to accomplish it.
Thank you, Jelvix, making our vision into a reality. You executed, delivered and were responsive through the whole project. The finished product has an awesome look, feel and user experience that will change the way physical therapists and patients interact between visits.
Our application was finished and able to generate revenue within one year as the Jelvix team adhered to the required timeline efficiently and professionally. They were communicative, responsive, and always available to take on feedback and make tweaks or changes as required.
Jelvix delivered digital products that are fit for purpose and, in the case of the mobile apps, award-winning. Led by an engaged project manager, communication with the development team is smooth and purposeful. They contributed conceptually to the solutions and were excited to problem-solve.
Solutions:
Technologies:
Sasha Andrieiev
CEO at Jelvix
Our goal is to build software solutions that truly matter, making the world a better place for everyone while helping entrepreneurs succeed in their journey.
For 16 years, Jelvix has been a strategic tech partner for global leaders and innovators. We leverage high-end design, rigorous QA, and expert consultancy to engineer scalable solutions that turn complex business challenges into market-leading products.
Engineer, modernize, and scale enterprise platforms through .NET software development for web, cloud, and core workflows.
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years in business.
in combined client revenue.
сertified security standards.
Domain-proven delivery across regulated and high-load sectors,engineered for strict compliance, zero-failure data sync, and high-concurrency production demands.
Services
Each .NET development project is always accompanied by some pressure points: the date of the project launch, an old system that your internal developers cannot work with anymore, or the scalability limitation you hit. Our .NET development services are oriented towards helping you overcome whichever issue you are dealing with right now. We have successfully developed .NET applications for fintech platforms processing live transactions, retail apps during the holiday season, and enterprise software used by multiple departments daily. That’s why scoping the project with us implies considering the 3x load on the system.
We build custom ASP.NET Core web applications, business solutions, and software products for customers from scratch. Our specialists decide which .NET framework version, which database, and which hosting to use based on how your business will look in three years, and develop the architecture accordingly. It is custom software development that is done around your process, not the other way around.
Our ASP.NET development services include MVC, Web API, and Blazor applications for those organizations that require high-performance software solutions able to withstand the production environment. By default, we use .NET Core and the latest version of .NET, but in some cases, we will advise that using the .NET Framework longer would be more sensible.
Are you using .NET Framework, Windows Forms, or an old edition of ASP.NET Web Forms? No problem. Our migration services will help you take the next step without writing a single line of code from scratch. The mapping of the legacy application, automatic versus manual porting possibilities, and staged migration allow you to keep your system working during the process.
Through .NET MAUI, the cross-platform development approach we adopt uses the same C# codebase for both iOS and Android applications, as opposed to having two separate teams and two separate lists of bugs for each platform. It implies that there is just one thing to fix and one team that knows both platforms.
As a business built around the Microsoft ecosystem, our Azure services include cloud application development by default, and AWS can be considered an alternative solution in case the customer’s infrastructure resides there. That includes Azure App Service deployments, Azure Functions, moving .NET applications to the cloud without a rewrite, and cloud services built for rapid development and deployment.
REST, GraphQL, and gRPC APIs are developed using .NET, and our integration services allow you to connect your .NET applications with the CRMs, ERPs, and payment systems that you use in your business processes. Most often, the integration work goes beyond the budget and is therefore explicitly scoped by us.
High-quality .NET software development goes beyond development and launching. After your .NET software is launched, our maintenance service will deal with bug fixing, performance management, security patches, as well as software version updates that guarantee development efficiency. We inform you about what we have found.
What We Build
.NET spans more ground than most platforms, which is exactly why picking the wrong piece of it for a given job is easy to do and expensive to undo. Below are the types of software we build with it, separate from the services built around them.
Internal tools, workflows, and enterprise-grade software solutions designed to remain scalable with hundreds of simultaneous users. Here lies the true value of .NET’s strong type system and advanced development environment, even down to its microservices design when scaling is required. We have moved from using spreadsheets and associated macros to software solutions that can be maintained by the whole IT team.
Software subscriptions designed with multiple tenants in mind on shared resources where tenant isolation and billing are inherent in the system design right from the start. This involves usage-based billing, tenant-specific role-based access controls, and onboarding for a new tenant that enables self-serve functionality.
Branded, secure connections to your CRM, ERP, or payment gateway, offering customers and partners a place to access information that they require without sending you emails through support. We start off with role-based access right from the beginning, ensuring that a customer, a reseller, and an internal administrator have a personalized interface tailored specifically for their role, using only one codebase.
For our mobile application development services, we have covered .NET MAUI applications that allow you to develop one app and deliver it for both iOS and Android devices using the same C# codebase, instead of developing two separate applications that might grow dissimilar over time. And with the same codebase, feature parity is no longer a project management issue since whatever gets delivered for iOS is delivered for Android in the same release.
Applications based on WPF and Windows Forms for the team that still performs certain activities through the desktop application and doesn’t have to start with a web app. In most cases, such an approach is relevant for manufacturing and logistics sectors where a terminal or dispatching application should rather be developed as a desktop one.
Software products using .NET to consume sensor and device data generated by IoT solutions, in addition to a reporting and analytics layer to provide data-driven insights for companies. We have built such solutions for Asset and Fleet Management, which can only truly add value by identifying the failure pattern before the machine breaks.
Tech Stack
.NET offers something that few other stacks have when it comes to using the right tool for the job: the ability to use one platform for your web applications, your desktop application, your mobile app, and your backend services. This is something our experts look to and do in accordance with best practices.
.NET 8 and above, .NET Core, ASP.NET Core MVC, ASP.NET Web API, Blazor, and WPF for those companies that still have a need for their Windows desktop applications to be developed properly. Our default is the latest .NET version, while we use .NET Framework only when required by some dependency.
C# is the heart of every single one of our dot net projects, together with the rest of the programming languages involved in our net solutions. Additionally, for those doing data-related and functional-type work, we have support in F#, which is developed in Visual Studio, depending on the way your current team operates. PowerShell completes our development toolset for deployments without the need for a pipeline.
We work with Microsoft Azure as our standard cloud service provider because it comes from the same company as .NET and is thus highly compatible with it. We use Amazon Web Services when the client’s infrastructure lies with it and employ Docker, Kubernetes, and GitHub Actions or Azure DevOps for our CI/CD processes. Our performance monitoring can be done from the get-go through Application Insights and Monitor.
Microsoft SQL Server is perfectly compatible with .NET and is our default choice for all projects, except for those that require PostgreSQL or NoSQL databases, such as MongoDB, where Entity Framework manages the data access. Which database we recommend for your .NET apps depends on the actual access pattern: a reporting-heavy system gets different treatment than a transactional one processing thousands of writes a minute.
xUnit and NUnit are used for unit testing, Selenium automates browser tests, while Postman is used to test APIs, no matter how large or small the project is. Tests are automated and executed as part of the CI pipeline on each pull request, not only before the release.
Who We Serve
.NET varies in implementation due to the different requirements and needs of each industry it caters to. It is the same approach that has led to a standard build requiring a rebuild after eighteen months. Here’s how our implementation relates to the industries that we know.
. NET’s built-in security makes it well-suited for applications that handle patient information and can’t skimp on compliance. We have implemented over 145 healthcare projects, and each conforms to HIPAA standards from the start. We’ve built EHR integration layers specifically to cut down the manual re-entry that eats clinical staff time.
Our portfolio consists of more than 170 fintech solutions. The efficiency and type safety of .NET ensure that it can be used for the development of applications in which any flaw, from rounding to race conditions, will not only be a bug but will also turn into a legal issue. We have created systems that deal with real-time transactions, so that even a two-second delay in fraud detection can be very expensive.
The scalable nature of .NET architecture shows its effectiveness when it comes to managing traffic peaks that occur due to the holiday season, flash sales, and the Black Friday load testing. It is engineered for traffic peaks from the architectural stage on, not as a solution for last year’s website failure.
We have handled over 200 projects in the real estate sector, and the stability of .NET comes in handy for property portfolios where a syncing mistake between your CRM and your accounting software translates into losses. The stability of .NET becomes crucial, especially during the time of lease renewals.
The ability of .NET to work with software applications and IoT through WPF and Azure IoT makes it ideal for developing products used by manufacturing and logistics companies. Software is used on factory floors and in the back of trucks during deliveries, which means that the assumption of sporadic connectivity is made from the beginning.
The robustness of .NET, as well as the media capabilities provided by Azure, make this platform suitable for those who require the system to remain operational when the crowd appears simultaneously. We have developed a ticketing application that manages the peak traffic resulting from selling tickets for a major event.
Featured projects
.NET projects that produce results you can measure.
Challenge
A payment services company required modernizing its legacy core to comply with the deadlines for SEPA Instant and DORA.
What we built
A rebuilt payment processing core on a .NET Core/C# backend, engineered for SEPA Instant’s high-load, real-time requirements.
Result
The client achieved SEPA Instant efficiency and full DORA compliance without operational disruption.
Each new provider location on this diabetes care platform required custom EHR integration to be done from scratch, taking 16 to 20 weeks per location, meaning that the platform could not scale.
A reusable .NET microservices architecture with FHIR and HL7 interoperability to integrate with Epic and Oracle Health, plus an audit of site capabilities in each deployment.
Go-live time per site was cut from 20 weeks to 6.
A real estate operator was losing money to sync errors and manual reporting work across a portfolio running on Yardi.
A custom C#/.NET API integration layer connecting Yardi to the client’s existing systems, with automated reporting built in across the portfolio.
$1.8M in annual losses eliminated. Automated reporting across 250+ properties.
Testimonials
We staff each sprint based on what the project needs. The client experience, though, stays consistent.
Founder & Co-Founder, Real Estate Company
Jelvix built a centralized integration layer connecting Yardi Voyager with Salesforce and NetSuite. Their work included solution architecture, API integrations, and audit logging. The integration eliminated more than 40 hours of manual reconciliation each week and significantly reduced operational losses
Co-Founder & Executive Chairman, PUSH DOCTOR
They had a strong grasp of both the regulatory landscape and the engineering detail required to navigate it.
Managing Director, Financial Services Firm
Jelvix automated a complicated lease process without forcing us into a full replacement. Their API-first platform integrated our CRM, ERP, and Yardi systems, reducing processing time by 75% and data errors by 85%. Their understanding of cross-system architecture was invaluable.
Why Jelvix
When you’re evaluating a .NET development company, the pitch usually sounds the same: senior talent, on time, on budget. Software development services are easy to promise and hard to deliver consistently. Here’s what that looks like at Jelvix as a development partner, and how it differs from a development company offering the same three bullet points as everyone else on this search page.
A .NET services company that accepts all projects is not helping you out. If your usage scenario suits another stack, or it is better to update your existing system than to rewrite it, we will inform you about this during the discovery call before signing the contract and while there is still time to change the decision.
The process of migrating your .NET application doesn’t mean that you stop developing new features of your software for half a year. We do migrations step by step so that your development doesn’t stop.
Supported by extensive practical experience in working with Microsoft technologies, Jelvix is certified according to ISO/IEC 27001 for information security management systems and ISO 9001 for its quality management system, with HIPAA-compliant development for healthcare .NET projects. This compliance is embedded in the system right from the first sprint.
84% of our developers possess technical expertise at an intermediate or advanced level, while 62% of the team has worked for Jelvix for more than three years. The technical know-how is critical when migrating to .NET or for multi-stage software engineering, because it enables a developer to keep the context even nine months after the first week of the project.
Engagement Models
There is no one-size-fits-all answer to outsourcing your .NET project. The decision depends on whether you lack certain skills, a team of people, or capacity to take care of building on top of all your responsibilities. All of the following models address these particular needs.
A full .NET development team, backend developers, QA, and DevOps, assigned to your build full-time and managed by either your PM or ours. Best suited to a long-term or large-scope engagement where you want direct control without hiring in-house.
Jelvix’s business analysts, architects, developers, and QA specialists own the .NET project from requirements through delivery. Best for teams that want to outsource end-to-end delivery without managing day-to-day execution.
One or several experts with .NET skills become a part of your current team, working under your supervision to fill a particular skill gap: an ASP.NET Core developer or a DevOps developer with cloud expertise on a non-permanent basis. This helps your team have enough development capacity to meet a particular deadline without making your employees work overtime. Perfect for short-term staffing and skill-specific issues. The majority of development projects begin within 7 working days after signing the contract.
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