Years Experience
Enterprise customers
Certifications
Industries Served
Professional Summary
Microsoft Certified Senior .NET Developer with 23+ 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. My cloud-native Azure work has been concentrated on enterprise-grade solutions since 2021.
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 23 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, and 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. My experience extends beyond development alone: requirements analysis, technical design, solution architecture, code reviews, production support and direct communication with business stakeholders. Understanding the business behind the software has always been just as important to me as writing clean, maintainable code.
Technology evolves rapidly, and I've 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'm known for being reliable, analytical and detail-oriented — I take pride in writing clean, well-structured code, considering edge cases carefully, and communicating openly to find practical, long-term solutions rather than quick fixes.
I integrate modern AI development tools, including GitHub Copilot, into my workflow to improve productivity while maintaining full responsibility for architecture, code quality and technical decisions. I use these tools to work smarter and deliver faster — not to cut corners.
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, Key Vault, Application Insights, 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: Responsible use of AI-assisted development tools, including GitHub Copilot, integrated into the SDLC—while retaining full ownership of architecture, code quality and technical decisions.
- 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
References
I'm happy to provide references from former colleagues and managers at Nationale-Nederlanden, ACTUM Digital and T-Mobile — full contact details available on request.
Continuous Innovation
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.
Alongside my full-time engagement, I hold two part-time advisory/ownership roles — these do not affect my full-time availability.
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