Hello, I'm Stoyan Kostadinov
TONSAN1
About Me
I'm Stoyan Kostadinov, a senior full-stack developer with strong hands-on experience building and operating distributed systems with ASP.NET Core and React. I work comfortably across backend APIs, frontend SPA architecture, databases, Kubernetes deployments, observability, and CI/CD pipelines, including Azure DevOps-based delivery flows.
My focus is pragmatic engineering: reliable systems, traceable integrations, production debugging, and automated delivery workflows that hold up under real-world constraints.
Core Strengths
- Advanced ASP.NET Core APIs, integrations, and service-to-service communication
- React SPAs with Vite-style environment configuration and production debugging
- PostgreSQL reporting, EF Core, validation pipelines, and schema operations
- Kubernetes, Helm, Docker, and multi-service deployment workflows
- Prometheus, Grafana, Loki, and practical health-monitoring strategy
- Azure DevOps and automated build pipelines for application delivery
How I Work
- Strong production debugging mindset focused on tracing instead of guessing
- Comfortable moving across frontend, backend, infrastructure, and CI/CD without blockers
- Pragmatic approach shaped by constrained environments, legacy systems, and operational ownership
- Clear emphasis on safe delivery, observability, and solutions that teams can actually run
Backend & APIs
ASP.NET Core95%
REST / Service Integrations90%
SOAP / JSON-RPC / OIDC85%
PostgreSQL / Reporting SQL / EF Core85%
Background Jobs / ETL Pipelines88%
Logging / Diagnostics / Health Checks90%
Frontend
React / Vite / SPA Architecture90%
HTML / CSS / SCSS90%
Bootstrap / Responsive UI88%
MUI / Component-Driven UI84%
JavaScript / API Integration82%
DevOps & Observability
Docker / Helm / Kubernetes88%
Prometheus / Grafana / Loki90%
Azure DevOps / Build Pipelines88%
GitLab Registry / Release Automation82%
+
Cross-Stack Skill Areas
Certificates in History
Education&Certificates
