Looking to elevate your web applications or ERP systems? As a Full-Stack .NET Developer, I specialize in building scalable, high-performance solutions that drive results. With 7+ years of experience, I bring your vision to life through robust, maintainable code, intuitive user interfaces, and seamless integrations, all while optimizing for speed and efficiency.
Here’s what I offer:
Custom .NET Development – Tailored solutions using ASP.NET MVC, C#, and Entity Framework
ERP System Expertise – Custom modules, reporting, and workflow automation to streamline business operations
Performance Optimization – Fast, efficient code with caching, server tuning, and database optimization
Cross-Platform Mobile Apps – React Native for building mobile solutions alongside web applications
Let’s work together to create solutions that drive your business forward!
.NET Framework
C#
ASP.NET MVC
Entity Framework
Microsoft SQL Server
Desktop Application
API Integration
LINQ
Object-Oriented Programming
Web Application
Entity Relationship Diagram
Performance Optimization
Agile Software Development
Version Control
ASP.NET Web API
Konstantin S.
Pau, France
$60/hr
4.8
44 jobs
Hello! I’m a CTO, Senior .NET Core Developer, AI Developer, and AI Agent Developer with 20+ years of experience in enterprise software engineering, cloud architecture, SaaS development, distributed systems, and AI Development.
I have delivered 150+ AI projects, launched my own production AI products, and created the Managed Code Coding AI Framework (MCAF) — a structured framework for applying AI across the software development lifecycle while preserving engineering quality, governance, security, and predictable delivery.
My work combines advanced AI Development with deep expertise in C#, .NET Core, Microsoft Azure, Orleans, enterprise architecture, and operational automation.
What I Build
• AI agents and multi-agent systems
• AI chatbots, copilots, and intelligent assistants
• OpenAI- and Claude-powered applications
• RAG and enterprise knowledge systems
• AI SaaS products and internal platforms
• Workflow and business process automation
• Scalable .NET APIs and distributed cloud systems
• AI integration for existing and legacy software
I work as an AI Developer, AI Software Developer, AI Chatbot Developer, AI App Developer, OpenAI Developer, Claude Developer, and AI Agent Developer.
AI Agent Architecture
I specialize in the systems layer that transforms an LLM into a reliable production-grade agent.
My expertise includes:
• Agent harness architecture
• Execution, reasoning, and control loops
• Multi-agent orchestration
• Tool calling and task delegation
• Context, memory, and state management
• Guardrails, governance, and access control
• Human-in-the-loop approval workflows
• Validation, retries, fallbacks, and recovery
• Agent evaluation, tracing, and observability
An effective AI agent is not simply a model connected to an interface. It requires a complete operational architecture around the model: tools, permissions, memory, business rules, execution control, monitoring, and failure handling.
Managed Code Coding AI Framework
I created the Managed Code Coding AI Framework (MCAF) to help engineering teams adopt AI in a controlled, measurable, and scalable way.
MCAF provides a structured approach to:
• Integrate AI into software delivery workflows
• Improve developer productivity without reducing code quality
• Introduce governance and validation into AI-assisted development
• Standardize how teams use AI across analysis, coding, testing, and documentation
• Reduce delivery time and repetitive engineering work
• Preserve security, maintainability, and architectural consistency
The framework is designed for organizations that need more than isolated AI tools. It helps transform AI usage into a repeatable engineering capability.
Business Value
My objective is not to add AI for its own sake. I design systems that create measurable operational and financial value.
Depending on the process, my solutions can:
• Reduce manual workflow steps by 40–80%
• Convert hours of repetitive work into minutes
• Reduce AI and token costs by 30–70%
• Improve system reliability through validation and fallback logic
• Accelerate product delivery and internal decision-making
• Increase process consistency and reduce human error
• Extend existing teams without proportional headcount growth
I focus on the full cost of ownership, not only initial development. This includes model usage, infrastructure, maintenance, observability, security, and long-term scalability.
AI Cost Optimization
I optimize AI systems through:
• Model routing
• Semantic and response caching
• Prompt and context optimization
• Selective retrieval
• Context compression
• Token budgeting
• Structured outputs
• Small-model and large-model escalation
• Usage monitoring and cost controls
This allows companies to maintain response quality while reducing unnecessary token usage, latency, and infrastructure expenses.
Core Technologies
C#, .NET Core, ASP.NET Core, Microsoft Azure, Azure OpenAI, OpenAI API, Claude API, Orleans, Aspire, RAG, vector and hybrid search, REST APIs, microservices, Docker, Kubernetes, DevOps, CI/CD, and MCAF.
I can take a project from discovery and architecture to implementation, deployment, optimization, and long-term support—whether the goal is to build a new AI product, modernize an enterprise platform, introduce AI-assisted development, or automate complex business operations.
C#
Artificial Intelligence
Machine Learning
Python
Computer Vision
Natural Language Processing
Deep Learning
ASP.NET
Artificial Neural Network
Retrieval Augmented Generation
Data Analysis
Microsoft Azure
API Integration
AI Model Integration
JavaScript
Neural Network
Data Science
Solution Architecture
AI Agent Development
Rust
Muhammad Haseeb T.
Paris, France
$30/hr
5.0
22 jobs
Thank you for considering my profile. I’m a passionate and pragmatic software engineer with 7 years of professional experience, specializing in full-stack development and App development using Microsoft technologies on the backend and JavaScript framework on front-ent.
Strong in object-oriented analysis and design and experience with a wide range of front-end and back-end frameworks (see below). Also, being an artist in nature, I have a good sense of design, colors, and usability and can build beautiful and modern interfaces that people love.
I can assist in all stages of the software development lifecycle and deliver working software with clean architecture, clean code, and automated tests. I have been working remotely on Upwork for more than 2 year, and within less than a year, I am top rated with 100 percent Job Success Score.
✔ If you never try, you'll never know
✔ I love to convert user requirements into working functionality.
✔ Let's get started.
I have experience in different areas of programming and tools.
✔ Server-side apps (Asp.net core, NodeJS)
✔ SPA (Angular, React/Redux)
✔ App development (Xamarin Forms, React-Native)
✔ Unit testing and Integration testing
✔ Cross-platform Xamarin (C#, .NET) apps,
✔ Cross-platform React-Native apps,
✔ Architecture
✔ HTML/CSS
✔ Bootstrap
✔ Support and Maintenance
Best regards
ASP.NET Web API
Entity Framework
SQL
React
NestJS
.NET Core
Mobile App Development
Angular
TypeScript
Redux
Bootstrap
ASP.NET Core
JavaScript
React Native
Xamarin
Microsoft SQL Server
Reda H.
Paris, France
$10/hr
5.0
4 jobs
I am an experienced Software Engineer and Agility Coach with a strong background in full-stack development and collaboration with international teams on complex, multi-domain projects spanning E-commerce, public organizations, telecommunications, ERP, and more. I actively contribute to designing and building scalable products using diverse technologies.
With an open mind, agility, and a deep understanding of software testing, I prioritize quality and efficiency, ensuring robust and reliable solutions.
technologies: c#, .net, typescript, react, html, css, javascript, python, SQL, docker, APIs, jenkins, CI/CD, Git, jira, redmine.
.NET Framework
Script
Web Development
Ecommerce Website
API Development
.NET Core
React
Microsoft SQL Server
TypeScript
Python
Java
CSS
Back-End Development
Front-End Development
Database
Hassani M.
Garches, France
$45/hr
5.0
1 jobs
I’m a Full Stack Software Engineer with over 8 years of hands-on experience delivering enterprise-grade, secure, and scalable web and mobile solutions. I specialize in .NET (Core, 6, 7, 8), Angular, Azure, DevOps pipelines, SQL Server, PostgreSQL, and Flutter for mobile.
I’ve built and delivered systems for leading banks and multinational corporations, including:
🏦 CIH Bank (Morocco) – financial service applications, secure APIs, and automation systems.
🏦 Société Générale (France) – scalable backend systems and microservices for financial operations.
🏦 AXA (France) – insurance automation, data integration, and cloud modernization.
🏦 Natixis (France) – internal banking tools and data management platforms.
🚗 Nissan (UK) – production and logistics-related applications.
I’ve also worked with multiple startups and B2C clients, helping them go from idea to live MVPs in record time.
⚙️ My Core Technical Stack
🔹 Backend Development
.NET 6 / 7 / 8, ASP.NET Core, C#, Entity Framework Core
RESTful APIs, gRPC, Microservices, WebSockets
Domain-Driven Design (DDD), CQRS, Clean Architecture
Authentication & Authorization (JWT, OAuth2, Azure AD)
Background services, scheduled jobs, and event-driven systems
🔹 Frontend Development
Angular (v10+), TypeScript, RxJS, TailwindCSS, Material Design
Reactive state management and component-driven architecture
REST API integration, modular routing, lazy loading, performance optimization
🔹 Cloud & DevOps
Azure App Services, Azure Functions, Azure SQL, Blob Storage
Azure DevOps CI/CD Pipelines, GitHub Actions, Docker, Kubernetes
Infrastructure as Code (IaC), ARM templates, Terraform basics
Application monitoring, logging, and deployment automation
🔹 Databases
SQL Server, PostgreSQL, Azure SQL
Database design, optimization, indexing, complex queries, stored procedures
Data migrations, backup & restore strategies, replication
🔹 Mobile Development
Flutter cross-platform development (iOS & Android)
Riverpod state management, in-app purchases, Firebase integration
Subscription systems, onboarding workflows, offline support with SQLite
🚀 My Work Philosophy – Ship Fast, Ship Smart
I focus on delivering results quickly and efficiently without compromising code quality or scalability.
I apply a "Ship Fast" methodology for MVPs: short development cycles, fast iterations, and production-ready code within weeks.
For larger projects, I lead with Agile/Scrum principles:
Sprint planning, backlog prioritization, and roadmap management
Team coordination (devs, QA, designers, PMs)
Code reviews, CI/CD automation, and continuous improvement
Whether you need a solo full-stack developer or a technical lead to guide your team through an enterprise project, I can help you achieve predictable, scalable delivery.
🧠 Why Clients Hire Me
Bank-Grade Reliability: Years of experience with financial institutions where security, compliance, and uptime matter most.
Technical Depth + Management Experience: I can code, architect, and manage — ensuring the entire project stays on track.
MVP to Scale: I’ve helped startups and established businesses launch new digital products in record time.
Clean, Maintainable Code: SOLID principles, modular architecture, and best DevOps practices built into every delivery.
End-to-End Ownership: From planning, design, and development to deployment and maintenance — I handle it all.
💬 What You Can Expect When Working With Me
✅ Transparent communication — daily or weekly updates, clear timelines, and total visibility.
✅ Fast and reliable delivery — I don’t just promise, I deliver production-ready results.
✅ Long-term mindset — I build systems designed to evolve, scale, and perform over time.
✅ Collaboration — I can work independently or manage and mentor a small development team.
✅ Full technical documentation and deployment guidance provided at every stage.
🧩 Industries I’ve Worked In
Banking & Financial Services
Insurance
Automotive
Healthcare
SaaS & Subscription-based Apps
Education & Learning Platforms
Retail & B2C Mobile Solutions
🧰 Key Strengths
End-to-end product development (Web + Mobile + Cloud)
Scalable architecture for high-traffic systems
Cross-platform development (Flutter + Web APIs)
Azure cloud deployment, monitoring, and cost optimization
SQL performance tuning and data consistency
Leading teams through modern Agile and DevOps processes
🌍 Let’s Build Something Impactful
If you’re looking for a reliable full-stack engineer who can design, implement, and deploy robust systems — and who understands what quality and delivery really mean — I’d love to collaborate.
I can:
Architect and build secure .NET & Angular platforms
Integrate complex APIs and databases
Launch Flutter mobile apps with subscription models
Set up CI/CD pipelines and cloud infrastructure
Manage a development team and ensure on-time delivery
📩 Let’s discuss your project.
Whether it’s a large enterprise platform or a startup MVP
C#
.NET Core
Angular
Azure DevOps
Clean Architecture
Domain-Driven Design
SQL
PostgreSQL
Agile Software Development
Microsoft Azure
ASP.NET Web API
Authorize.Net
TCP/IP
GraphQL
Microservice
M-Waseem A.
Nantes, France
$20/hr
4.9
22 jobs
I have proficiency in Embedded Systems, and Artificial Intelligence (Machine Learning & Data Mining). Contact me for freelancing projects or consultation!
.NET Framework
C#
Arduino
C++
Python
JavaScript
HTML
React
CSS
.NET Core
MVC Framework
Microservice
Angular
AngularJS
SQL
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