617SW

.NET Custom Development ยท Boston, MA

The systems your business actually runs on.

Mobile apps get the spotlight, but the .NET backend is where the work happens โ€” the APIs, integrations, and internal tools that keep orders moving and books balanced. We build those in C# and .NET, and we build them to last.

Capabilities

C# and .NET, wherever it needs to run

Cloud, on-prem, or the hybrid reality most businesses actually live in.

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ASP.NET Core APIs

REST and gRPC services that power your mobile apps, partner integrations, and web frontends โ€” documented and versioned.

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Line-of-business systems

Internal tools, dashboards, and workflow software tailored to how your operation really works โ€” not how off-the-shelf software assumes it does.

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Integrations

QuickBooks, Salesforce, ERPs, payment processors, EDI โ€” we make the systems you already own talk to each other.

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Azure & cloud architecture

App Services, Functions, SQL, and messaging on Azure or AWS, with infrastructure-as-code and sane cost profiles.

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Legacy modernization

Migrating aging .NET Framework and WinForms systems to modern .NET without stopping the business to do it.

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Security & reliability

Authentication done right, least-privilege access, audit trails, backups, and monitoring baked in from day one.

How we work

Built like infrastructure, delivered like a product

  1. 01

    Map the system

    We document what exists โ€” data, integrations, pain points โ€” before proposing anything.

  2. 02

    Design the architecture

    A plan sized to your business: no microservice sprawl for a ten-person company.

  3. 03

    Build in increments

    Working software every couple of weeks, deployed to a staging environment you can poke at.

  4. 04

    Operate & support

    Documentation, hand-off or ongoing support โ€” your call. Either way, you own the code.

Need custom .NET work?

New system, stalled project, or a legacy app on life support โ€” describe where you are and we'll map a route out.

Get in touch โ†’