Technical Architect / Senior Full-Stack Engineer
Konrad Gajda.
I turn unclear integration, identity and modernization work into systems teams can explain, test and operate.
I modernize enterprise applications, design secure integrations and improve delivery and performance while staying close to implementation.
18+ years across NATO, financial services, insurance, industrial engineering and railway environments taught me to protect business behavior while moving platforms forward.
Evidence at a glance
Credibility before claims
Selected architecture work
Decisions, delivery and outcomes
Three examples showing how I work through constraints, implementation and validation without exposing confidential project details.
.NET Web API
Legacy Modernization and Performance Recovery
Modernization of legacy PHP and data-heavy workflows toward .NET Web API, Blazor and faster application/database behavior.
Evidence
Reduced selected response times from around 12 seconds to under 500 milliseconds.
- .NET Web API
- Blazor
- SQL Server
- Performance
React
Enterprise Authentication and Authorization Flow
Identity-aware application flow across primary React frontend delivery, Web API contracts, identity-provider callbacks, logout, refresh and security boundaries.
Evidence
Clarified React frontend, Web API and identity-provider responsibilities across login, refresh and logout paths.
- React
- .NET Web API
- OpenAPI
- Microsoft Entra ID
Azure Event Hubs
Azure Event Hubs Integration Adapter
Event-driven integration adapter for railway GIS workflows using Azure Event Hubs, hexagonal architecture, provider abstraction and independent validation tooling.
Evidence
Separated domain behavior from provider-specific GIS integration concerns.
- Azure Event Hubs
- Hexagonal architecture
- Integration
- GIS
How I help
Capabilities organized around delivery
Technologies support the work. The capability and the decision remain the point.
Architecture and modernization
Legacy analysis, target boundaries, API architecture, migration planning and decisions that reduce delivery risk.
- Legacy modernization
- API architecture
- Architecture decisions
- Migration strategy
Application engineering
Hands-on delivery across modern frontends, .NET services, explicit contracts and automated validation.
- .NET and ASP.NET Core
- React and Angular
- OpenAPI
- Automated testing
Cloud and delivery
Containerized delivery, infrastructure coordination, pipelines and operational readiness close to the application.
- Azure and AKS
- Docker and Kubernetes
- GitLab CI/CD
- Monitoring and observability
Data and performance
Relational data, query investigation, caching decisions and measurable application performance recovery.
- SQL Server
- PostgreSQL and Oracle
- Query optimization
- Performance measurement
Technical writing
Architecture notes from delivery
Practical writing about modernization, contracts, infrastructure and engineering with AI.
Frontend architectureContract-first frontend delivery with OpenAPI and MSWA pragmatic pattern for keeping frontend teams productive while backend contracts are still moving.
ModernizationLegacy modernization without losing business behaviorModernization succeeds when contracts, data, validation and operational knowledge are treated as first-class design inputs.
SecuritySecure integration starts with exposure windowsFor file exchange and operational integrations, the key architecture question is often how long access exists and how it is audited.
AI-assisted developmentAI-Augmented Development Is Not Free AnymoreAI-assisted development has financial, mental, ethical, environmental and professional costs. The responsible engineer needs cost awareness, verification and judgment.
AI-assisted developmentWhy Abstraction Matters in AI-Augmented DevelopmentAI can generate code quickly, but abstraction keeps change controlled, contracts stable and generated output aligned with the wider system.
AI-assisted developmentDocumentation in AI-Augmented DevelopmentDocumentation is becoming context infrastructure: the shared memory and verification surface that helps humans and AI agents build coherent systems.Selected experience
Enterprise delivery across systems and sectors
2025/01 - Present
Technical Architect / Senior Full-Stack Engineer
0101 BV - Client assignment for Ypto (SNCB/NMBS Group)
Current assignment combining hands-on full-stack delivery with increasing solution-architecture responsibility for business-critical railway applications in the SNCB/NMBS environment.
2022/11 - 2024/12
Senior Full-Stack Developer
0101 BV - Client assignment for Euroclear via ProjectiveGroup
Contributed to Euroclear's strategic Business Activity Monitoring application in a complex, event-driven financial-services environment.
2022/01 - 2022/10
Senior Full-Stack Developer
0101 BV - Client assignment for Atlas Copco via Moebius
Developed engineering applications for research and sales teams to analyze compressor performance and identify optimal compressor configurations.
Start a focused conversation
Planning a modernization or architecture initiative?
Share the system constraint, delivery risk or outcome you need to achieve. A short description is enough to begin.