Hire the Best .NET Framework C# Engineers in New York

As an engineering leader and full-stack engineer with a backend focus, I bring a wealth of experience in leading teams and hands-on coding for scalable enterprise solutions. My expertise spans across Web2 and Web3 technologies, having contributed significantly to projects in diverse industries such as document management, blockchain, legal, telecommunications, and finance. I'm highly proficient in NodeJS, NestJs, ReactJs, NextJs, GraphQL, Dot Net, C#, and DevOps among others. My proficiency extends to blockchain engineering, with a solid understanding of Ethereum and Smart Contracts. I'm also adept at managing SQL as well as NoSQL databases and have significant experience with MSSQL, Postgres and MongoDB, and deploying CI/CD pipeline using Git Actions, Docker and Kubernetes. My passion lies in leveraging these skills to create robust, efficient, and innovative solutions.

I build the systems, then document them for compliance. Most AI governance help is one or the other: policy consultants who can't read your codebase, or engineers who've never mapped a control. I do both, and I hold the IAPP AIGP. What I work on: EU AI Act readiness. Article 50 transparency obligations took effect 2 August 2026 and apply now to anyone shipping generative, conversational, or synthetic-media systems into the EU. Article 50(2) marking requirements reach existing systems on 2 December 2026. High-risk obligations were deferred to December 2027, which is a readiness window rather than a reprieve, and the inventory and classification work has to start well before then. Conformity documentation. I built a .NET application that generates structured conformity documentation from model artifacts, with a calibration harness that scores output against reference documents so reliability is measured rather than assumed. I can do this work manually for your systems or help you stand up something similar internally. Framework mapping. Hands-on NIST AI RMF assessments and ISO/IEC 42001 control mapping, including where the two overlap so you're not maintaining parallel evidence for both. The engineering underneath. Production C#/.NET services, Azure, Kubernetes, and Terraform, delivered under regulated change control with enforced separation of duties and tamper-evident change history. Governance advice that ignores how software actually ships tends to produce documents nobody can implement. Good fits: AI Act gap assessments, model documentation and technical files, RAI program setup for teams without a dedicated function, or a second opinion on governance work already underway. Send me what you're building and what regulation you're worried about, and I'll tell you honestly whether it's a fit.

Software Engineer with over eight years of experience developing products and features using the .NET ecosystem and deploying using cloud services such as AWS and Microsoft Azure. Specializes in backend systems, relational database operation and management, 3rd party integrations, and cloud service integrations.

Turning Software engineering into scalable cloud infrastructure and Rest API design. My journey started in data science & analytics, where I built Python tools to clean. process, and analyze complex datasets. While working with data pipelines and automation, I developed a strong interest in backend systems and cloud infrastructure, which led me to specialize in Python engineering and Cloud DevOps. I now design and automate scalable AWS infrastructure using Python and Infrastructure as Code (IaC) to support modern application and data-driven systems. I previously worked as an AWS Infrastructure & CDK Engineer at TrendzAct, where I designed and deployed production-grade cloud environments and automated provisioning using Python-based AWS CDK projects and AI-based applications. Instead of manual setup, I focus on automated, repeatble, and secure infrastructure that allows teams to deploy faster and scale efficiently. What I Can Help With • Design scalable AWS cloud architectures • Build Infrastructure as Code using Python and AWS CDK, Terraform, Kubernetes • Automate deployment pipelines and cloud provisioning • Design VPC networks, VPN connectivity, and secure cloud environments • Migrate on-premise systems to AWS • Deploy backend systems using Lambda, ECS, EC2, and API Gateway • Optimize infrastructure for cost, scalability, and performance Technologies & Tools Programming Python (Automation, Cloud Engineering, Data Science), .NET, Java, Node.js Cloud Platforms AWS • GCP • Azure AWS Services EC2 • Lambda • API Gateway • ECS • RDS • VPC • IAM • S3 • Cognito • CloudFront • SNS • SES • SQS • CloudWatch Infrastructure as Code Python CDK • Terraform • Kubernetes • SAM • Cloud Automation Databases MSSQL • MongoDB • SQL • Aurora • DynamoDB • MongoDB Front End React •  Angular •  Vue • React Native • Flutter Other Skills Linux • Networking • Cloud Security • Solution Architecture, Zoho CRM, HubSpot, Mailchimp AI Claude • N8N • OpenAI • LLM If you need AWS infrastructure automation, cloud migration or scalable backend systems, feel free to reach out.

My specialty and proven track record is enabling founders to go from idea to production rapidly using an AI-driven, agentic software development process built around the following AI-centric pipeline: Discovery → AI Transcription → AI-Optimized Spec → Test-first Development → AI and Human Code Review → Iterative Delivery → Production Claude Cowork was written in 10 days utilizing this process. My background: I’m a US based Fractional CTO & Software Architect with 20+ years of experience leading startups to funding. This combined with extensive experience leading mission-critical initiatives at large organizations like The Federal Reserve and Fannie Mae. I work best with founders who want to move fast, stay lean, and get to a real, working product without unnecessary complexity. Let's build something great.

✅ I HELP SOLVE YOUR TECH PROBLEMS, SIMPLE AS THAT. ✅ I'LL LEVERAGE MY DECADES OF EXPERIENCE AS A FULL-STACK WEB DEVELOPER / SYSTEMS ARCHITECT / TECHNICAL LEAD / TECH MANAGER / FRACTIONAL CTO – WITH TOP COMPANIES – to get your project done correctly and cost effectively, using a problem-solving approach honed over decades of experience in the industry, capped off with excellent communication skills. ✅ IF YOU NEED AN ENTIRE TECH TEAM ASSEMBLED, LARGE OR SMALL... – If, instead of my individual services, you’re looking for a team to be built out to work on your project, I will use my many years of tech management experience to assemble and personally manage that team, ensuring the highest quality of delivered work, following industry best practices, and engaging my personal philosophy of software development that I have fine-tuned over my decades-long career. ————————————————————————— MY NAME IS MICHAEL R. KLOSNER, AND I'M HERE TO HELP YOU: ➠ OVER 15 YEARS EXPERIENCE IN THE INDUSTRY ➠ UPWORK EXPERT-VETTED (TOP 1% FREELANCER) STATUS ➠ 100% 5-STAR REVIEWS FROM ALL MY CLIENTS. ✅ I’VE DEVELOPED / MANAGED FOR WORLD-FAMOUS COMPANIES / ORGANIZATIONS JPMorgan • March of Dimes • MultiView • Cartier • SEI • Festo • More... ✅ I’M A TOP 1% RATED FREELANCER, EXPERT-VETTED BY UPWORK The Upwork Expert-Vetted program identifies the top 1% of talent on the platform. All Expert-Vetted freelancers undergo a rigorous screening process. ✅ I HAVE A 100% 5-STAR RATING ⭐⭐⭐⭐⭐ 100% satisfaction and 5-Star ratings from every single one of my Upwork clients, who trust me with their most sensitive software products and executive-level decision making for their companies. ✅ HERE'S WHAT A RECENT MAJOR UPWORK CLIENT HAD TO SAY "Working with Michael was a seamless experience. He is highly skilled, timely, and brings a great deal of technical talent to the table. What stood out most was his ability to provide practical advice that saved us time and resources. He navigated every challenge we threw at him with a 'problem-solver' mindset. I will definitely be hiring him again for future software needs!" ✅ YALE-EDUCATED COMPUTER SCIENTIST I hold a B.Sc. in Computer Science from Yale University and an M.Sc. in Marine Biology from the University of the Algarve in Faro, Portugal. I have studied directly under leading experts in Computer Science, including winners of the Turing Award, the highest distinction in the field. ✅ EXCELLENT COMMUNICATOR Top clients specifically choose to work with me because they value the clear and concise communication that I provide throughout the entire lifecycle of the project. Whether with my clients themselves, with senior or junior developers, non-technical staff, investors or potential customers, I have a proven track record of excellent written and spoken communication skills, both with individuals and small or large groups. ✅ LET’S GET YOUR PROJECT DONE THE RIGHT WAY! Take a moment to text me with answers to the following 3 questions, and I’ll get back to you, within 24 hours, with a detailed response: 1. What is the nature (scope) of your project and what is the ultimate goal of your business / organization? 2. What is the single major technological block you are facing right now that prevents you from completing the project? 3. If you could have your project done the right way, what exactly would that look like to you? ————————————————————————— MICHAEL R. KLOSNER ➠ Upwork Expert-Vetted / 100% Client Satisfaction ➠ Full Stack Developer ➠ Systems Architect ➠ Tech Manager ➠ Fractional CTO ➠ 15+ Years Experience SELECTED TECHNICAL EXPERTISE ➠ Technology Management, CTO, VP Engineering, Lead Developer ➠ NET Core (7,8,9) / .NET Framework, MVC, C#, C++, C ➠ JavaScript, React.js, Node.js, Express.js, jQuery, TypeScript, Angular, Wix Blocks (Velo) ➠ SQL, SQL Server, MySQL, Stored Procedures, NoSQL (MongoDB), Entity Framework ➠ eCommerce Integration, Stripe, Amazon Payments, PayPal, Shopify ➠ SSO, OAuth, Okta, OpenID Connect (OIDC), JWT, 2FA ➠ DevOps, Azure Cloud, AWS (EC2, RDS, EBS), SDLC, Git, Atlassian ➠ HTML 5, CSS 2/3, XML, XSLT, JSON, AJAX / Fetch / Axios ➠ REST API, Web API, Zapier, Webhooks, ActiveCampaign, SendGrid, Lucene / SOLR, WordPress, PHP, Java ➠ Agile, Scrum, Clean / SOLID Architectures, Headless Stack / CMS ➠ Systems Architecture, Mathematics, Matlab, Signal processing, R (Statistics) / RStudio