.NET Developers in the US

About .NET Developers

Senior C# engineers for ASP.NET Core APIs, Blazor front ends, Entity Framework data layers, and Azure workloads, available as a dedicated developer or a small product team. This is a newer service line for us, so we will be honest about where our shipped experience is deepest and back every .NET build with written scope, tests, and CI. Flat INR quotes, W-8BEN and LUT on file, and a reply within 24 hours.

What the engagement includes

• Senior engineers only, no interns, and one named owner for the whole engagement.
• Modern .NET by default: .NET 8 or the current LTS .NET 10, ASP.NET Core, and EF Core, not a fresh WebForms project.
• Tests and CI are part of the build, not a later cleanup: xUnit or NUnit, integration tests, and a green pipeline before merge.
• You own the GitHub or Azure DevOps repo, the cloud accounts, and the IP from day one, with full transfer on payment.
• Flat INR quotes with GST for Indian clients, and USD, GBP, CAD, or AED via Wise for overseas teams, with W-8BEN and LUT on file.
• A 24-hour response including weekends, and a paid trial sprint on request so you can judge the work before a longer commitment.

SEC recordkeeping, HIPAA transaction standards and CISA's Microsoft 365 baselines for US .NET developers

At a US broker-dealer, the .NET tools that touch Microsoft 365 are recordkeeping systems whether or not anyone designed them that way. SEC Rule 17a-4(b)(4) requires a broker-dealer to keep originals of all communications received and copies of all communications sent relating to its business as such, for at least three years, the first two in an easily accessible place. The SEC showed what that means on 27 September 2022, when it charged fifteen broker-dealers and one affiliated investment adviser over failures to maintain and preserve electronic communications, with combined penalties of more than $1.1 billion. Internal tools are channels too. A Bot Framework bot that posts trade confirmations into a Teams chat, an Outlook add-in that emails clients through its own SMTP relay, or a WPF utility that pushes alerts through a third-party SMS gateway each creates or carries business communications, and if they bypass the archive the firm has approved, the firm has built its own off-channel problem. The rule also sets terms for storage. Under its current text an electronic recordkeeping system must keep either a complete time-stamped audit trail of every modification and deletion, including who made it, or the records in a non-rewriteable, non-erasable format, must verify its storing processes automatically, must be able to produce a record and its audit trail in human-readable and usable electronic formats on request, and needs a backup set or equivalent redundancy. So the design rule on these engagements is that every outbound message from custom code travels through a channel the firm's capture already covers, Graph calls that post to Teams use identities the compliance archive monitors rather than a service account nobody enrolled, and any store a tool keeps of its own is either never the record of a communication or meets the audit-trail standard. What counts as a business communication for your firm is for your chief compliance officer.

In US healthcare the format of an electronic claim is set by federal regulation, which is why so much revenue cycle code is .NET written against X12 rather than a vendor's JSON. Under 45 CFR 162.923 a covered entity that conducts an electronic transaction with another covered entity, where HHS has adopted a standard for it, must use the standard transaction, and a clearinghouse or other business associate doing it on the entity's behalf must comply too. For professional, institutional and dental claims the standard has been the X12 837 in version 5010 since 1 January 2012, and the CAQH CORE operating rules for electronic funds transfer and remittance advice have applied since 1 January 2014, including the rule for reassociating an ACH payment with its 835. Retail pharmacy claims are mid-change: the NCPDP Telecommunication standard moves from version D.0 to F6, with both permitted from 14 August 2027 and F6 alone from 14 April 2028, so a pharmacy claims module written now has to speak both. The other lesson of the decade is operational. HHS's Office for Civil Rights called the 2024 ransomware attack on Change Healthcare unprecedented in its impact on patient care and on providers nationwide, and Change told OCR on 31 July 2025 that about 192.7 million individuals were affected. Providers that reached payers only through that clearinghouse had no second route. So on a .NET claims engine the X12 generation and parsing live in a library you own, tested against the implementation guides rather than one clearinghouse's acceptance quirks, and the clearinghouse sits behind an adapter with its own enrollment and acknowledgment handling, so a second connection can be stood up quickly. The 999 and 277CA acknowledgments are stored and reconciled per batch, because an unacknowledged file is a claim nobody has received. Which standards and payers apply to you is for your compliance and revenue cycle teams.

For a .NET developer working inside a federal civilian agency's Microsoft 365 tenant, the tenant's settings now come from a directive rather than local preference. CISA's Binding Operational Directive 25-01, issued on 17 December 2024, required agencies to deploy its SCuBA assessment tools by 25 April 2025 and to implement the mandatory Secure Configuration Baseline policies by 20 June 2025, with deviations accepted only by the agency's authorizing official and reported to CISA. Several of the mandatory policies decide how custom code gets built. Only administrators may register applications, user consent to applications is restricted and an admin consent workflow must exist, so a developer cannot create an app registration or grant Microsoft Graph permissions to a tool alone; the request goes through the agency's administrators with each permission justified. Legacy authentication is blocked and SMTP AUTH is disabled in Exchange Online, so a .NET service that still sends mail through SmtpClient or MailKit with a username and password stops working and moves to Graph under an application identity. Phishing-resistant multi-factor authentication is mandatory for all users, which reaches a contractor's account too, and Teams external access is enabled only domain by domain, so working with an outside team needs the agency to allow that team's domain. Power Platform environment creation is restricted to administrators, which affects anyone planning to extend a .NET system with Power Automate flows. The baselines also recommend, without making it mandatory, that guest invitations go only to authorized external domains and only from holders of the Guest Inviter role. The workable sequence on an engagement is to list the app registrations, Graph permissions, mail paths and guest access the work needs on day one, get them approved through the consent workflow, and write the code against identities that actually exist. Outside federal civilian agencies the directive is not binding, though CISA recommends the same policies to everyone. Which deviations your authorizing official has accepted is for your agency's security team.

How we work with US clients

A US engagement gets agreed twice. Once with the person who wants the thing built, and then again with legal, security, procurement and finance, who arrive separately and rarely in the same week. That second round is where a supplier outside the country loses the calendar: a master services agreement to redline, a security questionnaire, a certificate of insurance, and a vendor portal that assumes everyone it onboards can sign a W-9. Send all of it while the scope is still being written rather than in the week you wanted to start, and where the honest answer to a row is that we do not hold something, we write that in rather than leaving it blank.

You are also buying from a company you cannot drop in on, so the evidence has to do the work an office would otherwise do. What we send is live production URLs rather than a deck, a written scope with one fixed number against it, and the names of the people who will do the work rather than a bench that changes after signature. What we will also tell you is the shape of what you are hiring: a small team in Noida that has been building since 2021, not a firm that can put four more people on your project next Monday. If that is what your timeline needs, we say so before the contract rather than after it.

Questions US clients ask

.NET Developers: common questions

Other markets we work in