Years Experience
Enterprise customers
Completed Projects
Positive feedback
Professional Summary
Microsoft Certified Senior .NET Developer with 25+ years of experience designing and developing enterprise software solutions using C#, ASP.NET Core, Azure and SQL Server.
Experienced in modernizing legacy applications, building cloud-native systems and delivering business-critical solutions for organizations in banking, insurance, telecommunications, automotive and the public sector.
Core Expertise
- Enterprise Web Applications
- ASP.NET Core & C#
- Microsoft Azure
- SQL Server
- REST APIs
- Legacy Modernization
About me
Hi, I'm Petr Nejedlý, a Microsoft Certified Senior .NET Developer with more than 25 years of experience designing, developing and maintaining enterprise software solutions.
I specialize in building reliable web applications and backend systems using C#, .NET, ASP.NET Core, Azure and SQL Server. Throughout my career, I've worked on projects ranging from traditional ASP.NET Web Forms applications to modern cloud-native solutions built on Microsoft Azure with REST APIs, Azure Functions, Blazor and distributed services.
During the past two decades, I have contributed to software projects for international companies in telecommunications, banking, insurance, automotive and public sectors. I enjoy transforming complex business requirements into maintainable, scalable software that delivers real value to both customers and end users.
My experience extends beyond software development alone. I have participated in requirements analysis, technical design, solution architecture, code reviews, production support and direct communication with customers and business stakeholders. Understanding the business behind the software has always been just as important to me as writing clean, maintainable code.
While deeply specialized in robust server-side architecture and cloud infrastructure, I possess strong full-stack capabilities (Blazor, Bootstrap, modern frontend integration), allowing me to seamlessly bridge the gap between heavy data processing and intuitive user experiences.
Technology evolves rapidly, and I genuinely enjoy learning. Over the years I have successfully adapted through multiple generations of Microsoft technologies, from classic ASP and ASP.NET Web Forms to ASP.NET Core, Razor Pages, Blazor and Microsoft Azure. I believe that solid software engineering principles remain valuable regardless of the framework or technology currently in use.
I am known for being reliable, analytical and detail-oriented. I take pride in writing clean, well-structured code, carefully considering edge cases, and delivering solutions that are easy to maintain and extend. Colleagues appreciate that I approach problems methodically, communicate openly and always strive to find practical, long-term solutions rather than quick fixes.
Whether joining an existing team or starting a new project, my goal is always the same: to help build software that is robust, maintainable and delivers measurable business value.
AI-Assisted Software Development: I integrate modern AI development tools into my daily workflow to improve productivity while maintaining full responsibility for architecture, code quality and technical decisions. GitHub Copilot accelerates intelligent code completion and in-editor development, reducing boilerplate and common patterns. OpenCode serves as my agentic assistant for complex refactoring, architectural improvements, and large-feature implementation. OpenSpec enables spec-driven development, transforming complex business requirements into well-structured technical specifications before development begins. This strategic use of AI means you benefit from faster delivery timelines, higher code quality, and better problem-solving, while I maintain complete ownership of all architectural decisions, design patterns, and technical strategy. I don't use these tools to cut corners. I use them to work smarter, stay current with industry practices, and give you more value.
Technologies and tools I am familiar with
Core Technologies: C#, .NET, ASP.NET Core, Blazor, REST APIs. Cloud: Microsoft Azure, Azure Functions, Service Bus, Storage, Bicep. Databases: SQL Server, Dapper, Entity Framework.
Enterprise Engineering Standards
- Architecture & Design: Domain-Driven Design (DDD), Clean Architecture, Microservices, and Cloud-Native patterns.
- DevOps & Infrastructure: Infrastructure as Code (Bicep), CI/CD pipelines via Azure DevOps/GitHub Actions, and secure enterprise cloud networking (VNETs, Private Endpoints).
- AI-Accelerated Engineering: Deep integration of GitHub Copilot, OpenCode, and OpenSpec into the SDLC—delivering high-quality, spec-driven code at an accelerated velocity.
- Methodology: Agile/Scrum framework with a strong emphasis on cross-functional business stakeholder alignment.
Clients
Here is the list of clients I have worked for, both directly and indirectly as a subcontractor.
- Nationale-Nederlanden Life Insurance
- BMW Group
- Komerční pojišťovna
- Komerční banka
- GEALAN Fenster-Systeme GmbH
- Postillion Hotels B.V.
- La Lorraine, Inc.
- Raiffeisen - Leasing
- Allnex
- Pietro Filipi
- The Academy of Performing Arts in Prague
- Prague Boats
- SCHOTT AG
- T-Mobile
Featured Projects
-
Client: Nationale-Nederlanden Life Insurance
Project: Enterprise Payment Platform
Technologies: ASP.NET Core Web APIs, Blazor WebAssembly, Azure Functions, Azure Service Bus, SQL Server
Architected and delivered a secure, cloud-native Enterprise Payment Platform handling high-volume incoming and outgoing financial transactions for a major European insurance company. Leveraged an advanced Azure serverless stack (Azure Functions, Service Bus) and a Blazor WebAssembly frontend to ensure near-zero downtime, robust security compliance, and high throughput. -
Client: BMW Group
Project: Knowledge base Content Management System
Technologies: Kentico Kontent.ai, ASP.NET Core, Azure Storage
Worked on the implementation of the Kontent.ai headless CMS for BMW's internal training knowledge base. -
Client: T-Mobile
Project: Internal Content Management System
Technologies: ASP.NET WebForms, SQL Server, SharePoint, IIS, Active Directory, HTML, CSS, Bootstrap.
Spearheaded the technical architecture and end-to-end development of T-Mobile’s core internal CMS and Intranet framework, scaling to support thousands of internal users. Engineered custom enterprise API integrations mapping critical communication flows across TIBCO, SMS Centers, and IVR systems.
References
If you have a professional obligation to your client and need to reference every candidate you submit to them, here are some contacts you may want to reach out to.
- Miroslav Beneda
Former superior at T-Mobile
https://www.linkedin.com/in/miroslav-beneda-776b03224/ - Jan Pomahač
Former colleague at T-Mobile
https://www.linkedin.com/in/pomahac/ - Michael Sido
Former business partner at T-Mobile
https://www.linkedin.com/in/michael-sido-b100b44/ - Simona Kašturová
Former business partner at T-Mobile
https://www.linkedin.com/in/simonakasturova/ - Tereza Gutierrez
Former superior at ACTUM Digital
https://www.linkedin.com/in/terezagutierrez/ - Ondrej Zubec
Former superior at ACTUM Digital
https://www.linkedin.com/in/ondrejzubec/ - Václav Novák
Former superior at ACTUM Digital
https://www.linkedin.com/in/v%C3%A1clav-nov%C3%A1k-8178a693/ - Jindřich Piroutek
Former colleague at ACTUM Digital
https://www.linkedin.com/in/jindrichpiroutek/ - Filip Zeman
Former colleague at ACTUM Digital
https://www.linkedin.com/in/filip-zeman-8620b937/ - Gianluca Turturro
Chief Solutions Officer at ACTUM Digital
https://www.linkedin.com/in/gianlucaturturro/ - Jan Havel
Co-Founder and Chief Strategy Officer at ACTUM Digital
https://www.linkedin.com/in/janhavel/ - Thijs Wolters
Former superior at Nationale-Nederlanden
https://www.linkedin.com/in/thijs-wolters-2a88a521/ - Gabriel Balogh
Former superior at Nationale-Nederlanden
https://www.linkedin.com/in/gabrielbalogh/
Continuous Innovation & Leadership
With over two decades of navigating the evolving Microsoft ecosystem, I bring a proven track record of rapidly adopting cutting-edge paradigms—from legacy modernization to state-of-the-art AI-assisted development architectures.
Engagement Preferences
I target high-impact, long-term contract or permanent opportunities operating on a fully remote basis. I excel when embedded into agile, high-performing product teams or digital agencies (English or Czech speaking) that value clean architecture, modern cloud practices, and measurable business results.
Certifications
MCSD: App Builder
MCSA: Web Applications
MCSA: Universal Windows Platform
MCP
Sitecore CPAD
Kentico
Work History
NN Group (Nationale-Nederlanden) Insurance company
Architected and delivered a secure, cloud-native Enterprise Payment Platform handling high-volume financial transactions for a major European insurance company. Designed and engineered an advanced serverless architecture utilizing ASP.NET Core Web APIs, Blazor WebAssembly, Azure Functions, and Azure Service Bus.
Established robust cloud infrastructure using Azure SQL, Blob Storage, and secure enterprise networking elements including VNETs, Subnets, and Private Endpoints. Collaborated across cross-functional teams to eliminate performance bottlenecks, ensure strict security compliance, and resolve complex production challenges to guarantee near-zero downtime.
ACTUM Digital
Engineered and delivered large-scale enterprise Experience Management (CMS) and Commerce solutions powered by Microsoft Azure, leveraging leading platforms Sitecore and Kentico.
Consulted and developed high-performance solutions for an extensive portfolio of international and local enterprise clients, including BMW Group, SCHOTT AG, Komerční banka, Komerční pojišťovna, and Raiffeisen - Leasing.
T-Mobile Czech Republic a.s.
Spearheaded the independent technical architecture, end-to-end development, and scaling of T-Mobile’s core internal CMS and Intranet framework, successfully supporting thousands of concurrent internal users across the enterprise using ASP.NET (C#) and high-performance SQL databases.
Engineered and optimized low-latency enterprise API integrations mapping critical communication flows across highly integrated backend systems, including TIBCO, SMS Centers, TIP, IVR, Genesys, and GIS platforms.
Owned the complete software development lifecycle (SDLC)—from translating raw business stakeholder requirements into technical specifications, to solution architecture, testing, automated deployment, and continuous technical evolution.
T-Mobile Czech Republic a.s.
Analyzed, engineered, and maintained bespoke enterprise systems and core web services built on ASP.NET (C#) integrated with high-volume MSSQL and Oracle databases. Partnered closely with external vendors to ensure seamless application delivery and robust long-term reliability for business-critical workflows.
Altermedia
Altermedia is a small digital agency based in Prague, Czech Republic, focusing on production of websites and e-commerce applications, creating text and multimedia content, and managing social networks.
Altermedia helps individuals, small and large companies in their growth, increasing their traffic and sales.
My responsibilities are business consultancy, project management, software design and architecture.
See altermedia.cz
Atlas Česka
Atlas Česka (Czech Atlas) is one of the largest and most recognizable free time activity websites in the Czech Republic with approximately 12.000 unique visitors every day.
My responsibilities are relationship management, business development, contracts negotiation and team management. In the past year I have been in charge of redesigning the website with more than 150 000 content pages (1.000+ working hours).
See atlasceska.cz