ASP.NET Core APIs
Minimal APIs, MVC controllers where they help, MediatR + vertical slice for larger apps, source-generator-driven serialization.
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Senior engineering · .NET
Senior .NET engineering for production systems.
.NET 8+ engineering for enterprise systems — ASP.NET Core, minimal APIs, EF Core, Azure-native deployments, and the .NET Framework 4.x → .NET migrations the proposal usually under-scopes.
- In production
- 2018+
- Senior bench
- 30+ G6/G9 engineers
- Floor
- G6+ on client work
- Engagement
- Outcome-led, not hourly
Why senior, not contractor
.NET in production is a different problem than .NET on a laptop.
Most .NET engagements live in two worlds: legacy .NET Framework 4.x apps on IIS that need to migrate to modern .NET, and greenfield builds that should be using minimal APIs and source generators but ship as if it's still .NET Core 2.0. Prosigns ships modern .NET 8+ with the patterns the framework actually rewards — minimal APIs where they fit, MediatR / vertical slice where they help, EF Core 8+ with proper change-tracking discipline, and Azure-native deployment that the operations team can defend.
Senior floor
G6+ minimum
Bench depth
30+ G6/G9 engineers
In production
2018+
Engagement
Outcome-led SOW
Where .NET ships
6 sub-areas, grounded in shipped engagements.
Specific applications of .NET we’ve built and operate. Every example below maps to a real engagement, not a bullet on a stack-card.
01 02 EF Core 8+ data access
Compiled queries, owned types, raw SQL where the ORM fights you, query splitting discipline, migrations that survive the upgrade.
03 Azure-native deployments
App Service, Container Apps, Functions, AKS. Bicep / Terraform IaC, Application Insights, Key Vault, Managed Identity.
04 Blazor + MAUI
Blazor Server / WebAssembly for internal tools, MAUI for cross-platform mobile + desktop where the productivity wins are real.
05 .NET Framework → .NET migrations
.NET 4.x → .NET 8+ with WCF replacement, EF6 → EF Core, IIS → containerized deploys, Web Forms decomposition.
06 Microsoft enterprise integration
Dynamics 365 + Power Platform extensions, SharePoint integration, Azure AD / Entra ID, M365 + Graph API workflows.
Stack depth
The .NET ecosystem, owned.
Frameworks, libraries, and runtime tools the bench has shipped in production. Not a CV-skim — a working depth.
Core framework
- .NET 8+
- ASP.NET Core
- Minimal APIs
- MediatR
- MassTransit
Data access
- EF Core
- Dapper
- Marten
- Linq2Db
- Cosmos DB SDK
Azure platforms
- App Service
- Container Apps
- Functions
- AKS
- Service Bus
UI
- Blazor Server
- Blazor WASM
- .NET MAUI
- Razor Pages
- WPF (legacy)
Quality + ops
- xUnit
- NUnit
- FluentAssertions
- Application Insights
- OpenTelemetry
Engagement models
Three ways to engage .NET engineers.
We don’t bill hourly contractors. Engagements run against outcomes — choose the shape that matches the work.
See engagement models- 01
Fixed-scope
Defined deliverable, fixed price
When the deliverable is clear and the scope is bounded — an MVP, a migration, a discrete platform build. Senior engineering against a written outcome, not against a body count.
- 02
Embedded squad
Senior product team, ongoing
When the work is product-shaped and the cadence is continuous. A senior pod (engineering + design + PM as needed) embedded into your team, with the practice lead co-piloting from HELM.
- 03
Managed services
Steady-state operations
When the system is running and needs ongoing engineering ownership — operations, SLO defense, release management, security and compliance evidence. Monthly retainer against a published SLA.
Selected work
.NET engineering that shipped.
Manufacturing
.NET 4.7 → .NET 8 migration with WCF replacement for a global manufacturer.
9 monthscutover with no downtime47 services on .NET Framework 4.7 migrated to .NET 8 minimal APIs. WCF replaced with gRPC + REST. EF6 → EF Core with reconciled migration. Containerized on Azure Container Apps.
Duration · 9 months
Brief us
Reply < 4 business hoursHave a .NET workload? Send a brief.
Five fields. Goes straight to the practice lead — not an SDR. We’ll reply with a senior engineer’s read on fit, scope, and the engagement model that suits the work.
FAQ
Questions buyers ask.
Everything below also appears in the proposal and the SOW — no surprises after signing.
Minimal APIs or controllers?
Minimal APIs for new services where the endpoint count is moderate and the team prefers vertical-slice organization. Controllers when complex routing, model binding, or filter pipelines pay for themselves. Both are first-class; we'll tell you which fits.
Blazor Server or WebAssembly?
Blazor Server for internal tools where SignalR latency is fine and full backend access matters. WebAssembly for public-facing apps where the WASM payload cost is acceptable and offline-capable interaction is the value. Increasingly we mix both via Auto render mode in .NET 8+.
Is this staff-aug, or is it engineering-led delivery?
Engineering-led delivery. We don't bill hourly contractors against your JIRA board. Every engagement runs against a defined outcome with a senior engineer accountable from kickoff to operating cutover. If you genuinely need staff-aug — discrete bodies, your management, hourly rates — we'll be honest and route you to a partner that fits.
What seniority floor are we talking about?
G6 minimum (six-plus years in their craft) on every billable hour. Department leads are G9 or G10. We don't flex juniors onto the bench mid-sprint, we don't subcontract to delivery centers, and we don't dilute senior rates with mixed staffing. The bench in the proposal is the bench in production.
How does pricing work?
Three engagement models published at /engagement-models/. Fixed-scope for defined deliverables, embedded squads for ongoing product work, managed services for steady-state operations. Rates depend on seniority, engagement length, and region. Discovery + scoping conversation is free; SOWs are written against deliverables, not bodies.
Where are your engineers based?
Senior-only across Dallas, Doha, Lahore, and Islamabad. We staff against the engagement's needs (timezone, language, regulatory frame), not against arbitrary regional preferences. Most engagements run with a US/EU-aligned core and a follow-the-sun extended bench when the workload warrants it.
Will the engineers I see in the proposal be the engineers shipping the work?
Yes. We name the engineers in the SOW, attach their profiles, and they're on the kickoff. We don't bait-and-switch with senior reviewers and junior execution. If a named engineer needs to roll off the engagement (rare), we surface a replacement from the same seniority tier with explicit handoff.
Talk to a .NET lead
Senior .NET engineering, accountable from kickoff.
Bring the workload — we’ll bring a senior engineer plus the practice lead most relevant to the work. 30 minutes, no obligation, no junior reps.