Software architecture
A well-designed foundation for your application. We structure systems, define interfaces and make the reasoning behind technical decisions clear.
ANDREAS KROLL · SENIOR DEVELOPER & ARCHITECT
Grounded in
experience –
built for
today
I have been developing software for demanding business processes since 1992. Today, my focus is C# and .NET, distributed cloud systems and AI. I write the code and help your business bring AI-assisted development into projects and teams.
Senior Software Architect · Lead Developer
From the first interface to a platform in production.
From the first interface to a platform in production.
BUILT TO CONNECT +
Applications ↗Interfaces ↗Data ↗
PROJECT EXPERIENCE SINCE 1992
ARCHITECTURE AND CODE.
WHAT WE CAN DO FOR YOU
Senior expertise.
Hands-on delivery.
Architecture decisions, production code and
knowledge transfer from one partner. For new products
and systems that have been running for years.
Custom development
Hands-on development of backends, APIs and web portals. Using C# and .NET, asynchronous processing and clear business logic – from implementation to testing and refactoring.
Integration & modernisation
Preserve what works and make room for what comes next. We connect data sources, modernise existing applications and support complex migrations.
AI integration & team leadership
Bring AI-assisted development into your projects by connecting suitable tasks, tools and team workflows. With code reviews, coaching and experience leading a team of six developers.
OVER THREE DECADES OF PROJECT EXPERIENCE
Complex systems.
Built for the long term.
From business applications in the 1990s
to today's AI platform. Architecture,
implementation and technical leadership.
CURRENT PROJECT · SINCE NOVEMBER 2019
hivr.ai
From data integration to
an AI-powered hotel platform.
Continuous development of a distributed multi-tier application for several thousand hotels and event venues. It handles the daily volume of meeting, group and event enquiries across different communication channels.
My contribution: Architecture and implementation of integrations, the portal and business logic; ongoing development of distributed services; and AI in both the product and the development process.
Discover hivr.ai- 2019 · DATA & INTEGRATION
Connecting heterogeneous sources
REST, FTP and scraping bring data together in an integration platform. Transformations, rules and asynchronous communication decouple processing.
- 2020 · PORTAL & BUSINESS LOGIC
From requirements to proposals
Meeting enquiries, roles, a product library, rules, prices and calendars in one portal. Booking and pricing information arrives through external interfaces.
- SINCE 2024 · AI IN THE PRODUCT
Understanding unstructured enquiries
AI supports the extraction and mapping of business requirements. Email, booking portals, telephone and websites form the current product context.
- TODAY · DISTRIBUTED PLATFORM
Modernising and developing further
Current work with C#/.NET, Azure, Cloudflare, Keycloak, Aspire, Orleans and Akka.NET. AI-assisted and agentic coding supports ongoing development.
Earlier projects
1992–2019 · Selected projects from the full profile2017–2019PORTAL MODERNISATIONA new platform. A team ready for it.Administration portal · Architecture & lead development
Rebuilt as a Vue.js SPA with ASP.NET Core. Architecture and tool selection, code reviews and coaching a team of six through practical implementation tasks.
Vue.js · C# · ASP.NET Core · JWT · MongoDB
2015–2019HOSPITALITY & INTEGRATIONTaking established systems further.Conference booking portal · Integration portal in 2019
Maintenance, performance optimisation and refactoring of a conference booking portal. In 2019, architecture of an integration portal: detecting database changes, deriving business events and connecting systems through REST, including a return channel for cancellations.
C# · ASP.NET MVC · Node.js · MongoDB · Elastic.IO
2012–2015TELECOMMUNICATIONSInfrastructure. Connected worldwide.Vodafone Group · CapMatrix · Architecture & lead development
A portal for planning server deployments in data centres worldwide. Consolidating infrastructure information, selecting suitable subnets and checking resources such as ports, IP addresses, power and cooling.
C# · ASP.NET MVC · MongoDB · Oracle
2011–2012INSURANCEEnd-to-end claims processes.ControlExpert · PropertyExpert · Development & team leadership
Data model, business layer and workflows for recording and processing claims. Role-based views connect insurers, service providers and end customers.
C# · Entity Framework · SQL Server · WCF
2009–2010LOGISTICS & BANKINGUnderstanding operations. Improving systems.DHL / GFT · Siemens / Deutsche Bank
Analysis, troubleshooting and performance optimisation at DHL. Automated server checks with agents, a scheduler and results management, plus tools for storage migration, DFS monitoring and log analysis in the Siemens/Deutsche Bank project context.
C# · WCF · REST · SQL Server · Active Directory
2005–2009TRAVEL & LAB AUTOMATIONPortals, booking systems and build pipelines.Poolside Reise · Expedia Deutschland · Olympus
Architecture and lead development of a travel portal, dynamic booking integration with parallel requests and a plugin bus, and CRM data consolidation. In laboratory automation: component development, unit tests and automated builds.
C# · ASP.NET · WCF · NUnit · MSBuild
2000–2005SALES & INFRASTRUCTUREConnecting new applications to existing systems.START Amadeus · Vodafone · Media Saturn · Siemens
Travel sales and offer searches, TCP/IP communication and host integration. Infrastructure and email migrations, permissions and archiving tools, and operational monitoring.
C++ · MFC · COM · C# · VB.NET · SQL Server
1992–1999BUSINESS APPLICATIONSThe foundation: software for real workflows.R+V Versicherung · Heimservice 2000 · other project clients
Electronic document management with inboxes, search and workflows; inventory management with branch synchronisation and CAD interfaces. Business applications, data conversion, printer drivers and hardware integration since 1992.
C/C++ · Visual Basic · Pascal · Delphi · IBM MQ
Selected content from the consultant profile, September 2026. Company names indicate project contexts. Product description: hivr.ai and integrations.
CURRENT DEVELOPMENT PRACTICE
Senior Engineering.
Making AI work in practice.
A broad foundation for selecting
the right technologies – and the experience
to integrate them into existing systems.
C# & Cloud Engineering
Backends, APIs and web applications. Clear business logic, asynchronous processing, containers and cloud deployment.
Distributed systems & identity
Service composition, stateful and message-driven processing, and identity and access management.
Web, data & integration
Portals and interfaces backed by robust data models. Consolidating heterogeneous sources and connecting business systems through APIs.
AI THROUGHOUT THE DEVELOPMENT PROCESS
From prompts to
orchestrated coding agents.
AI for analysis, implementation, refactoring, testing and documentation. With defined context, traceable changes and technical responsibility remaining with the developer.
- Prompts & contextClarify tasks, incorporate domain knowledge and structure outputs.
- AI-assisted CodingAnalyse and develop code; verify results through builds, tests and reviews.
- Agentic coding & orchestrationCoordinate multi-step tasks, connect tools through MCP servers and shape workflows with skills and harnesses.
OpenAI · Anthropic · Claude Code · Cursor · Codex · Gemini · DeepSeek
Make AI-assisted development part of your business.
I help you turn individual coding assistants into a development process you can understand and verify – suited to your codebase, your teams and your requirements.
Opportunities & pilot project
Select suitable tasks in analysis, development, testing and documentation. Start with a clearly scoped pilot and assess results against your existing quality standards.
Project knowledge & tools
Provide repository context, architecture rules and domain knowledge. Integrate MCP servers, skills and harnesses in line with your tools and access permissions.
Quality & responsibility
Connect reviews, tests and CI/CD with AI-assisted steps. Agree on rules for data access, approvals and accepting changes.
Teams & collaboration
Support developers on real tasks, establish reusable workflows and share knowledge within the team. Use agent orchestration where tasks and checks are clearly defined.
TECHNOLOGY CHANGES.
Good solutions
start with
understanding.
AKAndreas KrollSenior Software Architect · Lead Developer
PERSONAL. PRAGMATIC. COLLABORATIVE.
Your senior developer.
Working alongside you.
I'm Andreas Kroll, managing director of NTT-SolutionWare. I have been developing business applications since 1992 – for travel and hospitality, telecommunications, insurance, banking, logistics and industry.
As a software architect and lead developer, I stay close to the code, taking responsibility for technical decisions, implementation and knowledge transfer. Supporting projects over many years also means understanding how those decisions play out in production.
Full profile · WordExpertise and project history · September 2026
↗ One direct point of contact↗ Architecture and development from one partner↗ Based in Mettmann. Ready for your challenge.
THE NEXT STEP STARTS WITH A CONVERSATION.
What are
you planning?
Need senior support for your project or AI-assisted development for your team?
Let's talk about where you are today.
[email protected] +49 2104 175759-0NTT-SolutionWare GmbH
Am Hang 1/g · 40822 Mettmann
Germany
Am Hang 1/g · 40822 Mettmann
Germany
Personal collaboration. Shared solutions.