Microsoft .NET 9 & .NET 10 • Clean & Onion Architecture Specialists
From mission-critical ASP.NET Core Web APIs, SignalR real-time pipelines, and interactive .NET Blazor platforms to rescuing crashing legacy .NET Framework monoliths—we engineer secure, sub-50ms backend systems built on strict Onion Architecture that scale effortlessly across Azure, Google Cloud, Linux, and Windows Server.
End-to-End Backend & Web Engineering
We architect, build, modernize, and optimize mission-critical web applications and distributed APIs engineered for extreme concurrency and long-term maintainability.
Enterprise B2B/B2C web portals, multi-tenant SaaS platforms, and line-of-business systems engineered with ASP.NET Core MVC, Razor Pages, and strict Clean/Onion Architecture.
Measurable Business Impact: Up to 40% reduction in long-term maintenance overhead through decoupled domain layers.
High-throughput RESTful APIs, lightweight Minimal APIs, gRPC inter-service communication, OpenAPI/Swagger documentation, rate limiting, and idempotent webhook processors.
Measurable Business Impact: Sub-50ms P95 response times and 60% faster partner and mobile client integration.
Interactive Single-Page Applications (SPAs) and enterprise dashboards built entirely in C#—eliminating fragile JavaScript state synchronization and sharing DTOs across client and server.
Measurable Business Impact: 35% faster feature delivery with one unified C# full-stack engineering team.
Seamless, phased upgrades from aging ASP.NET WebForms, MVC 5, WCF, and VB.NET monoliths to modern cross-platform ASP.NET Core (.NET 9/10) using the YARP Strangler Fig pattern and Onion Architecture.
Measurable Business Impact: Up to 300% throughput improvement and 50% lower Linux/container cloud hosting costs.
Bi-directional real-time communication using ASP.NET Core SignalR and WebSockets for live financial tickers, AI worker progress streaming, collaborative dashboards, and instant push notifications.
Measurable Business Impact: Zero-polling real-time UX capable of handling thousands of concurrent connections.
Web.config & Assembly Conflict RescueDeep forensic debugging for unstable ASP.NET and IIS applications—resolving elusive assembly version conflicts (<bindingRedirect>), memory leaks, thread-pool starvation, and deadlocks that stump internal teams.
Measurable Business Impact: Permanent elimination of fatal production crashes without disruptive rewrites.
Advanced data modeling, Entity Framework Core + Dapper hybrid data access, SQL Server tempdb and index tuning, PostgreSQL optimization, and Redis distributed caching.
Measurable Business Impact: Eliminates database bottlenecks and cuts heavy report and API query times by up to 10x.
Integrate LLMs, Microsoft Semantic Kernel, ML.NET, and background PyTorch/ONNX worker queues into your ASP.NET Core backend via asynchronous channels, Hangfire/Quartz.NET, and Cloud Pub/Sub.
Measurable Business Impact: Production-ready AI automation with non-blocking HTTP API responsiveness.
OAuth 2.0, OpenID Connect, Microsoft Entra ID (Azure AD), Duende IdentityServer, JWT/refresh token rotation, OWASP Top 10 hardening (XSS, CSRF, SQLi protection), and GDPR / HIPAA / PCI-DSS compliance.
Measurable Business Impact: Bank-grade identity protection and audit-ready enterprise security posture.
Containerized Linux Docker/Kubernetes deployments, Azure App Services, Google Cloud Run, on-premise Windows Server/IIS optimization, GitHub Actions/Azure DevOps CI/CD, and L1–L3 production support.
Measurable Business Impact: Automated zero-downtime releases and 95%+ critical issue resolution within 24 hours.
Verified Engineering Track Record
When production servers crash under mysterious assembly conflicts, legacy upgrades drag on for months, or database bottlenecks stall operations, our principal-led team delivers decisive architectural fixes.
Web.config Assembly Binding UnificationA business-critical ASP.NET application was suffering from recurring, fatal runtime crashes in production. Despite weeks of effort, no one on the existing engineering team could reproduce the root cause or stop the IIS application pool from crashing under load.
We stepped in and performed a forensic audit of the runtime assembly loader and transitive dependency graph. After deep investigation, we uncovered silent version conflicts between multiple referenced libraries attempting to load incompatible assembly versions at runtime. We engineered precise <dependentAssembly> and <bindingRedirect> version-adoption rules inside Web.config to enforce deterministic assembly resolution across the entire application domain.
The "unsolvable" production crashes vanished permanently on day one of deployment—restoring 99.99% stability without requiring a costly rewrite.
A client needed to modernize aging ASP.NET applications to the latest .NET runtime while untangling tightly coupled business logic and data access code—under an aggressive deadline that traditional agencies quoted at 3 to 4 months.
Leveraging over two decades of .NET architectural mastery, we executed a rapid, structured refactoring into strict Onion Architecture (separating the Domain Core, Application Contracts, EF Core Infrastructure, and Presentation/API layers) while upgrading the target framework, NuGet packages, and Dependency Injection container.
Delivered the fully upgraded, unit-testable, Onion-architected ASP.NET Core applications in a record 2-week turnaround—slashing technical debt and accelerating future feature velocity.
Modern cross-platform applications (such as our flagship VisionFlow AI and LuminaEdit restoration systems) require an ultra-reliable backend capable of verifying Apple App Store / Google Play billing webhooks and orchestrating heavy AI tasks via Google Vertex AI without blocking HTTP threads.
We architected a high-concurrency ASP.NET Core Web API proxy paired with SignalR real-time hubs and Google Cloud Pub/Sub webhook endpoints. Incoming store notifications and long-running AI jobs are processed asynchronously with strict idempotency, streaming real-time progress percentages directly to connected clients.
Zero lost billing transactions, instant cross-device credit synchronization, and seamless real-time UX under heavy concurrent workloads.
tempdb Spills, IIS Deadlocks & Multi-Second API LatencyEnterprise ASP.NET systems backed by SQL Server and hosted on IIS were experiencing severe slowdowns, tempdb contention, and connection timeouts during peak business hours.
We audited SQL execution plans, server-level roles, and EF Core query translations—eliminating implicit conversions, adding covering indexes, converting chatty synchronous ORM queries into compiled async AsNoTracking projections, and introducing Redis distributed output caching alongside tuned IIS application pool recycling rules.
Reduced API response latency by over 80% (down to sub-50ms) and stabilized IIS memory and CPU utilization across peak traffic windows.
Phased Modernization Pipeline
Whether you are maintaining a 15-year-old ASP.NET WebForms monolith, MVC 5 portal, or WCF service layer, our 4-stage modernization pipeline transitions your system to modern .NET 9/10 with zero operational downtime.
Web.config AuditWe map all NuGet packages, transitive assembly binding redirects, System.Web session/context couplings, IIS modules, and SQL Server stored procedures to establish a risk-free migration inventory.
We isolate pure C# Domain Entities, Value Objects, and Application Use Cases (CQRS / MediatR) into a clean core with zero external framework or database dependencies—making business rules 100% unit-testable.
We replace legacy WCF/SOAP endpoints and tightly coupled controllers with ASP.NET Core Minimal/Web APIs, gRPC, and Blazor UI while routing live traffic incrementally via Microsoft YARP (Yet Another Reverse Proxy).
We package the modernized solution into lightweight Linux Docker containers or optimized Azure/IIS pipelines backed by xUnit integration test suites, OpenTelemetry tracing, and zero-downtime blue/green deployment.
Enterprise Backend Ecosystem
We master both cutting-edge .NET 9/10 cloud-native architectures and legacy .NET Framework internals—giving you one team that can rescue your past and engineer your future.
ASP.NET Core MVC, Minimal APIs, .NET Blazor (SSR / Server / WASM), Razor Pages, Native AOT, plus full mastery of Legacy .NET Framework 3.5–4.8 (WebForms, WCF, ASMX, Windows Services).
Strict Onion Architecture, Clean Architecture, Domain-Driven Design (DDD), CQRS with MediatR, Modular Monoliths, Event-Driven Microservices, and YARP Strangler Fig modernization patterns.
ASP.NET Core SignalR, WebSockets, gRPC, RabbitMQ, Azure Service Bus, Google Cloud Pub/Sub, Hangfire, Quartz.NET, and high-speed System.Threading.Channels.
Entity Framework Core, Dapper micro-ORM, ADO.NET, SQL Server (T-SQL, tempdb & execution plan tuning), PostgreSQL, Redis Distributed Cache, SQLite, and CosmosDB.
OAuth 2.0, OpenID Connect (OIDC), Microsoft Entra ID / B2C, Duende IdentityServer, ASP.NET Core Identity, hardware JWT token rotation, and RBAC/ABAC policy authorization.
IIS (Internet Information Services), Kestrel, YARP, Docker, Kubernetes, Azure, GCP, AWS, GitHub Actions, BitBucket Pipelines, dotnet-trace, Serilog, and OpenTelemetry.
Backend Architecture Benchmark
An objective evaluation across throughput, type safety, cloud infrastructure cost, and full-stack code reuse showing why ASP.NET Core leads modern enterprise engineering.
| Enterprise Evaluation Metric | ASP.NET Core (.NET 9/10) | Node.js (Express / NestJS) | Python (Django / FastAPI) | Java (Spring Boot) |
|---|---|---|---|---|
| 1. Raw HTTP Throughput & TechEmpower Benchmark | Top-Tier — Kestrel Native AOT & Span<T> Zero-Allocation delivering millions of requests/sec with sub-15ms P95 latency. |
Single-Threaded Event Loop — Degrades rapidly on CPU-bound tasks, complex serialization, or heavy cryptographic workloads. | GIL / Interpreter Overhead — Orders of magnitude slower on raw HTTP and CPU throughput; requires horizontal server sprawl. | High Throughput, Heavy Warmup — Strong JVM performance, but suffers from slower cold starts and large memory footprints. |
| 2. Type Safety & Enterprise Refactoring | Strict C# 13 Static Typing + Source Generators — Compile-time guarantees, true generics, records, and fearless solution-wide refactoring. | TypeScript Compile-Time Only — Types are erased at runtime; vulnerable to JSON payload drift and npm supply-chain breakage. |
Optional Type Hints — Dynamically typed at runtime; large codebases require extensive runtime testing to catch type regressions. | Strict Java Typing — Strong compile-time safety, though more verbose and lacking modern C# value-type ergonomics. |
| 3. Architectural Enforceability | Native DI, Middleware Pipeline & Clean/Onion Solution Templates — First-class architectural boundaries built into the SDK. | Unopinionated / NPM Sprawl — High risk of inconsistent folder structures and abandoned third-party middleware packages. | Batteries-Included Monolith — Fast for initial CRUD prototypes, but harder to enforce strict Onion/DDD boundaries at scale. | Heavy Annotation Boilerplate — Strong enterprise patterns, but complex XML/annotation configuration overhead. |
| 4. Shared Full-Stack & Mobile Code | 100% Shared C# Models — Share entities, validation rules, and DTOs directly with .NET MAUI (iOS/Android) & .NET Blazor Web. | Web / JS Mobile Only — Shares TypeScript interfaces with React/React Native, but cannot compile to native C# desktop/mobile handlers. | Backend & AI Scripts Only — Zero code sharing with native iOS, Android, or browser frontend UI layers. | Backend & Android Only — Cannot share domain models directly with iOS, web frontends, or Windows/macOS desktop apps. |
| 5. Memory Footprint & Cloud Hosting Cost | Ultra-Low on Linux Alpine Containers — Handles 5x–10x more concurrent requests per vCPU/GB of RAM, slashing Azure/AWS/GCP bills. | Medium Memory Usage — V8 heap grows quickly per worker process under high concurrent connection counts. | Medium-High Cloud Cost — Requires spawning multiple Uvicorn/Gunicorn worker processes per core to handle concurrency. | High RAM Consumption — JVM heap and metaspace requirements drive up container memory costs in Kubernetes clusters. |
| 6. Long-Term Enterprise Support | Microsoft LTS + 20+ Year Backward Compatibility Track Record — Predictable annual releases and rock-solid enterprise security patches. | Fast-Churning Ecosystem — Frequent breaking changes across community packages require constant dependency maintenance. | Community-Driven — Great for data science, but framework upgrades often break third-party async extensions. | Vendor Licensing Complexity — Fragmented JDK distributions and Oracle licensing considerations. |
Verified Client Testimonials
Real feedback from enterprise and international clients who partnered directly with Principal Architect Zeeshan Dad Khan.
“Zeeshan was an Excellent contractor. Available, Reliable and Knowledgeable. No hesitation in recommending.”
“Zeeshan Dad Khan has been an absolute pleasure to work with; patient, kind, informative, creative and efficient. He is truly an expert in his field. I continue to work with him and recommend him with the utmost confidence.”
“Zeeshan produced quality results for our Windows Phone 8 application. He was able to understand what was needed, make the correct assumptions and also recommend other solutions. Will hopefully get the opportunity to engage him again on future projects.”
Sector Expertise
High-availability ASP.NET Core backends engineered for strict regulatory compliance, financial accuracy, and heavy transactional throughput.
High-concurrency transaction ledgers, cryptographic webhook verification, automated reconciliation pipelines, and PCI-DSS compliant financial APIs.
HIPAA-compliant ASP.NET Core APIs, HL7/FHIR interoperability gateways, encrypted audit logging, and role-based patient and clinician web portals.
Isolated or shared-schema tenant databases, automated Stripe / App Store / Play Billing webhook processors, and real-time SignalR analytics dashboards.
Sub-50ms product catalog APIs backed by Redis distributed caching, multi-warehouse stock synchronization, and custom order-fulfillment engines.
High-frequency geolocation ingestion APIs, route optimization backends, and conflict-free offline synchronization endpoints for mobile field crews.
Hybrid ASP.NET Core + Python/PyTorch worker orchestration, Cloud Pub/Sub queues, and enterprise Microsoft Office/Outlook add-in backend services.
Collaboration Framework
Choose the engagement structure that fits your engineering urgency—from a 2-week modernization sprint to full turnkey platform delivery.
End-to-end delivery of enterprise web portals, multi-tenant SaaS platforms, Blazor applications, and distributed APIs under predictable, milestone-based deliverables.
Fast-track upgrade of outdated ASP.NET (.NET Framework, MVC 5, WebForms, or WCF) applications to modern .NET 9/10 with clean architectural separation.
Forensic debugging for crashing IIS/ASP.NET applications, elusive Web.config assembly binding conflicts, memory leaks, and slow SQL Server queries.
<bindingRedirect> unificationtempdb tuningEmbed senior C#, ASP.NET Core, Blazor, and SQL Server architects led by Zeeshan Dad Khan directly into your internal engineering team.
Frequently Asked Questions
Direct answers to the architectural, performance, and modernization questions CTOs and engineering leaders ask before engaging our team.
Yes. Modern ASP.NET Core (.NET 9 and .NET 10) consistently ranks at the top of independent TechEmpower web framework benchmarks, outperforming Node.js, Python, and Java in raw HTTP throughput and low memory allocation. Combined with Native AOT compilation, Span<T> zero-allocation pipelines, ultra-lightweight Linux Docker container support, and Microsoft's predictable Long-Term Support (LTS) lifecycle, ASP.NET Core delivers unmatched speed, security, and cloud cost efficiency for enterprise systems.
Yes. Forensic production rescue is one of our signature specialties. Unexplained IIS application pool crashes and intermittent runtime failures are frequently caused by silent transitive assembly version conflicts, broken binding redirects, thread-pool starvation, or unmanaged memory leaks. We audit your dependency graph, IIS dump files, and runtime assembly loader—implementing deterministic <dependentAssembly> and <bindingRedirect> version-adoption rules in Web.config or refactoring async bottlenecks—to permanently eliminate production crashes without requiring a costly ground-up rewrite.
While traditional consultancies often quote 3 to 6 months for legacy modernizations, our senior architects have completed full upgrades of legacy ASP.NET applications to the latest .NET runtime with strict Onion Architecture in a record 2-week turnaround for focused enterprise modules. By systematically isolating Domain Entities and Application contracts from EF Core infrastructure and presentation layers, we deliver a modernized, unit-testable codebase in weeks rather than quarters.
Legacy ASP.NET (.NET Framework 3.5–4.8) is tightly coupled to Windows Server, IIS, and the heavyweight System.Web pipeline configured via Web.config. Modern ASP.NET Core is a complete, cloud-native redesign that runs cross-platform on Linux, Docker, Kubernetes, and Windows via the high-speed Kestrel web server. ASP.NET Core features built-in dependency injection, a modular middleware pipeline, side-by-side runtime versioning, and 3x to 10x higher request throughput with up to 50% lower cloud hosting costs.
In traditional N-tier architectures, business logic becomes tightly coupled to database tables, EF Core contexts, and third-party libraries, making upgrades painful and unit testing nearly impossible. Onion Architecture places pure C# Domain Entities and business rules at the core, with all dependencies pointing inward via interfaces. Databases, external APIs, Redis caches, and web controllers live in outer infrastructure rings that can be swapped, upgraded, or mocked effortlessly—cutting long-term maintenance costs by up to 40%.
Yes. We architect ASP.NET Core as the unified central nervous system of your product ecosystem. It can share 100% of C# domain models and DTOs directly with .NET MAUI iOS and Android apps and .NET Blazor web clients, expose strongly typed OpenAPI/REST and gRPC endpoints for React, Angular, or Vue frontends, stream live updates over SignalR WebSockets, and orchestrate heavy Python/PyTorch AI background workers via Google Cloud Pub/Sub, RabbitMQ, or Azure Service Bus.
For high-concurrency, mission-critical enterprise systems, ASP.NET Core holds decisive advantages over Node.js and Python. Unlike single-threaded Node.js event loops or Python's Global Interpreter Lock (GIL), ASP.NET Core utilizes true multi-threaded, compiled C# 13 execution across all CPU cores. Combined with strict compile-time type safety, built-in architectural patterns, and dramatically lower RAM usage under heavy load, ASP.NET Core scales smoothly without the runtime type errors or npm dependency sprawl common in dynamic ecosystems.
Simply submit your project details through the consultation form on this page, email info@kcodecrafters.com, or message +92-3142003065 on WhatsApp. Every inquiry is reviewed directly by Principal Architect Zeeshan Dad Khan within 24 hours on business days. We can immediately initiate a forensic codebase/Web.config audit, kick off a 2-week modernization sprint, or embed dedicated senior ASP.NET Core engineers directly into your Git and CI/CD workflow.
Direct Principal Consultation
Discuss your greenfield ASP.NET Core API, Blazor web platform, 2-week legacy upgrade, or production crash rescue directly with Principal Architect Zeeshan Dad Khan. We reply to all inquiries within 24 hours on business days.
Zeeshan Dad Khan