MK Maroof Khan
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Senior Software Engineer . Full-Stack .NET Architect

Building reliable software systems for healthcare, enterprise, automation, and AI-driven workflows.

I am Maroof Khan, a software engineer with 14+ years of hands-on delivery across desktop, web, mobile, cloud-enabled systems, and modern AI integrations. I help organizations modernize legacy platforms, accelerate delivery, and launch production-grade products with strong engineering discipline.

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Portrait of Maroof Khan
Maroof Khan - Senior Software Engineer.

14+

Years of professional software engineering experience

4.4 / 5

Freelancer rating from 43 completed client reviews

Top 1%

Positioned in high-performing Full-Stack .NET and C++ talent tier

$30/hr

Freelancer profile rate for global project engagements

Profile

Engineering depth paired with practical business outcomes

My work spans Microsoft .NET ecosystems, from .NET Framework modernization to .NET Core 8 and Blazor delivery, including enterprise APIs, desktop applications, scheduling services, reporting pipelines, and full-stack product architecture.

In recent years, I have expanded into AI-enhanced software workflows, including PDF/XML conversion pipelines, automation systems, and intelligent process support. I focus on building systems that are maintainable, secure, and useful in real-world operations.

Services

How I contribute to product and engineering teams

Healthcare Billing Platforms

End-to-end U.S. healthcare billing systems with EDI-driven scheduler services, desktop tools, and web-based modernization to improve throughput and operational reliability.

Desktop and Device Integration

Windows desktop engineering with WPF/XAML, service agents, API-based synchronization, and biometric device integration (Cogent, ZKTeco, eSSL, Mantra) through native wrappers and secure protocols.

Full-Stack Web Product Delivery

ASP.NET MVC, Web API, Blazor, React, SQL Server, and reporting stacks for business-critical platforms including ERP, management systems, invoicing solutions, and booking products.

AI and Automation Solutions

Practical AI workflow integration for document processing, data extraction, validation loops, and agentive process design aligned to software delivery pipelines.

Tech Stack

Primary tools and technologies

Languages

  • C#
  • VB.NET
  • C / C++
  • JavaScript
  • Python

Backend and APIs

  • .NET Framework 3.5-4.8
  • .NET Core / .NET 8
  • ASP.NET MVC / Web Forms
  • Web API / REST API
  • Entity Framework

Frontend and UI

  • Blazor Server
  • React
  • HTML / CSS / Bootstrap
  • Material UI
  • jQuery / AJAX

Desktop and Services

  • WinForms
  • WPF / XAML
  • Windows Services
  • Windows API Integration
  • .NET MAUI

Data and Reporting

  • SQL Server
  • Performance Tuning
  • Crystal Reports
  • Microsoft Reporting Services
  • JSON / XML Workflows

Delivery and Collaboration

  • GitHub
  • Agile / Scrum
  • Azure DevOps
  • Cross-functional Mentorship
  • Remote Global Delivery

Experience

Career timeline

2021 - Present

Senior Software Engineer . 13thjune Infotech Pvt. Ltd.

Architected and modernized U.S. healthcare billing solutions, migrated legacy platforms to modern .NET stacks, delivered Blazor and React web products, optimized SQL performance, and supported team delivery under Agile sprints.

2019 - 2021

Freelancer Software Engineer . Global Remote Projects

Built and delivered software solutions across education, enterprise, compliance, inventory, and automation domains for clients in USA, UK, Australia, and other regions.

2011 - 2019

Software Engineer . Abaris Softech

Developed enterprise web systems, stock data integration libraries, ERP modules, service center platforms, and robust desktop products with reporting and database-backed workflows.

2007 - 2011

Early Career Projects and Consulting

Delivered full-cycle project management, asset tracking, invoicing, appointment booking, and bulk communication applications while building a strong software architecture foundation.

Long-Term Showcase

U.S. healthcare billing ecosystem delivery

Multi-year healthcare billing and claims platform engineering

I have worked for years on healthcare billing solutions used by U.S. service-provider operations, covering desktop workflows, scheduler services, web-based modules, and integrations with clearinghouse systems for claim/invoice processing and status tracking.

Domain workflows handled
  • Provider billing and invoicing lifecycle
  • Claim generation, submission, and reconciliation
  • Background scheduler jobs for high-volume processing
  • Employee service/time-entry capture via mobile and desktop tools
Healthcare EDI and formats
  • EDI 837P and 837I claim submission flows
  • EDI 277 claim status handling
  • EDI 835 remittance and payment response mapping
  • EDI 999 acknowledgment validation
Tools and technology stack
  • .NET Framework 3.5-4.8 modernization to .NET Core 8
  • C#, VB.NET, Blazor, ASP.NET MVC, React, Web API
  • SQL Server optimization and performance tuning
  • Crystal Reports, Microsoft Reporting, GitHub, Azure

Featured Work

Representative portfolio projects

U.S. Healthcare Claim and Billing Platform

Long-term product and engineering ownership across claim lifecycle automation, scheduler-based EDI pipelines, desktop workflow tooling, and web modernization for operational teams.

EDI 837P/I . 277 . 835 . 999

Headless AutoCAD DWG Processor .NET Plugin/worker application

Built a headless AutoCAD automation pipeline using a .NET worker and AutoCAD plugin to process job JSON, run accoreconsole.exe with generated scripts, replace block attributes/DBText/MText placeholders, and export both modified DWG and PDF outputs.

accoreconsole.exe . AutoCAD .NET SDK . DWG/PDF Output

Headless AutoCAD DWG Processor .NET Plugin/worker application with secure REST API and scheduling

Extended the worker to expose secure API-key REST endpoints, persist job payloads/status in PostgreSQL, process queued requests via scheduler threads, generate output paths from JSON parameters, and support IIS hosting or background Windows service deployment with detailed operational logging.

Secure REST API . PostgreSQL Job Queue . Scheduler . IIS/Service

Windows Desktop Agent (.NET/C#) - eSSL Biometric Device Integration via zkemkeeper.dll -- 2

Engineered a lightweight Windows tray agent for SaaS gym workflows with eSSL/ZKTeco integration over TCP/IP (port 4370), COM interop via zkemkeeper.dll, command polling through REST APIs, first-run setup wizard support (API key and LAN device discovery), and automated sync for user updates, validity windows, and device logs.

.NET Desktop . COM/ActiveX Interop . TCP/IP 4370 . REST Sync

Cost-Reducing Supply Chain Management

Delivered a full-stack supply chain optimization solution focused on reducing operational cost through reliable workflows, clear communication, and production-ready implementation across complex requirements.

Full-Stack Engineering . Process Optimization . Enterprise Delivery

MedSchedule Pro

Enterprise-grade clinic management and appointment scheduling platform designed for secure, streamlined healthcare operations.

Web Platform . Healthcare

Calcufin Invoice Generator

Multi-tenant, multi-lingual Blazor invoicing platform with subscription management, Stripe integration, reminder automation, and dynamic layout management.

Blazor . FinTech

SIPCA PDF Conversion Assistant

AI-assisted PDF-to-XML/CSV conversion workflow with S1000D-standard XML transformation for Aerospace/Defense documentation, including schema validation and self-correction feedback loops.

S1000D XML . Aerospace/Defense . AI Workflow

School Management Desktop App

Complete school operations suite covering admissions, attendance, exams, fee modules, ID cards, vehicle, and front-office workflows.

Desktop . Education

Digital Signature and Verification

C#/.NET cryptography implementation for secure remote signing, verification, and trusted document workflows.

Security . Compliance

Biometric Integrations

Device integrations and wrappers for fingerprint hardware workflows used in attendance and secure-access systems.

C++ Wrapper . Device APIs

Specialized Stack

Advanced integration capabilities for devices and communication layers

Biometric Device Integration

Hands-on integration with Cogent (3M), ZKTeco, eSSL (F22), Safran, and Mantra devices using native SDKs, wrappers, and desktop service agents.

ZKTeco and eSSL Agents

Implemented Windows desktop agents and protocol handlers for device sync, attendance events, and secure data exchange, including zkemkeeper.dll-driven workflows.

NFC and RFID Workflows

Built identity and access modules around NFC/RFID token reading, user mapping, event logging, and enterprise system synchronization.

Communication Protocols

Strong experience with TCP/IP socket communication, serial communication, and resilient retry logic for reliable device-to-server data pipelines.

Windows API and Utility Tooling

Developed Windows utility tools and API-level integrations for service orchestration, system monitoring, and controlled background operations in mission-critical environments.

Native Interop and Wrappers

C++ and .NET interop layers for native DLL wrapping, driver-compatible integrations, and performant managed API surfaces consumed by web and desktop applications.

Client Feedback

Rated client reviews by platform

Freelancer.com ★★★★★ 5.0 / 5 featured client rating
Upwork.com ★★★★★ 5.0 / 5 with 100% Job Success
Freelancer.com ★★★★★ 5.0 / 5

"Maroof has a strong command of .NET and delivered with speed and precision. He pays attention to details, explores innovative approaches, provides proactive updates, and explains technical concepts clearly."

Client review by Naveen M on Headless AutoCAD .NET Processing Plugin
Freelancer.com ★★★★★ 5.0 / 5

"Maroof was accommodating and helped debug deployment issues. His MS Windows knowledge supported timely delivery, and his documentation plus code walkthrough made the implementation easy to validate."

Client review by Naveen M on Headless AutoCAD DWG Processor
Freelancer.com ★★★★★ 5.0 / 5

"Marroof is an exceptional full-stack developer with deep technical expertise and a highly professional approach. He delivered quality work on time, understood requirements clearly, and provided smart solutions throughout the project."

Client review by Umesh K on Cost-Reducing Supply Chain Management
Freelancer.com ★★★★★ 5.0 / 5

"Maroof is a kind-hearted and highly knowledgeable person. He has deep expertise in Android app development, APIs, and AI, and consistently completed projects before the deadline with great precision."

Client review on Android App Screen Reader Optimization
Freelancer.com ★★★★★ 5.0 / 5

"Maroof did a very good job identifying protocols and delivering our biometric desktop agent on time. He provided updates on every step and showed strong desktop software expertise."

Client review by Bishwanath S on eSSL Biometric Device Integration
Upwork.com ★★★★★ 5.0 / 5

"Once again: fantastic job - within time, highly skilled programmer, always top-notch and pro-active. Highly recommended!"

Client feedback on L19 reporting Austria for enterprises (March 2026)
Upwork.com ★★★★★ 5.0 / 5

"It was a pleasure working with this freelancer. The website developed for my tool demonstrated exceptional quality in both design and technical execution."

Client feedback on website creation and tool integration (February 2026)

Contact

Let us build your next product

Available for remote consulting and development engagements across web, desktop, enterprise integrations, and AI-enabled software systems.

Email khanmaroof787@gmail.com Phone +91 82992 79070 Freelancer Profile freelancer.com/u/mkh559a5a1fd66e9 Upwork Profile upwork.com/freelancers/maroofk5 LinkedIn Profile linkedin.com/in/maroof-khan-1494931b7 Detailed Profile PDF Profile_MaroofKhan_DotNet_1.pdf