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Backends and APIs Python (FastAPI) and .NET (C#) services on PostgreSQL or SQL Server, with tested contracts. Also maintenance and incremental modernization of legacy .NET. |
Deterministic validation 3D and CAD checks that give the same verdict every time, with reproducible reports and AI tools that work under human oversight (MCP). |
Complete web apps Accessible Vue 3 and TypeScript frontends (WCAG 2.2 AA), delivered with Docker and continuous integration. |
The portfolio applications operate as an integrated platform of autonomous Bounded Contexts (DDD):
- Enterprise Context Map & Topology: C4 Level 1/2 architectural blueprints, asynchronous domain event routing over RabbitMQ, and boundary contracts.
- Architectural Fitness Functions: Automated CI checks (
NetArchTestin .NET, AST inspection in Python) enforcing layer boundary isolation. - FinOps & Production Capacity Model: Two-tier cost modeling from 0,00 EUR portfolio demonstration to 10k req/min enterprise production.
 ParametriCAD AI Deterministic CAD engine and 3D viewer. Exact solids, mesh topology checks, GLB, STEP and STL export. Live demo · Code |
 3D AI Conformance Demo 3D asset validation gateway with byte-level checks and reproducible reports. Live demo · Code |
 NainProspect B2B prospecting gateway with AI categorization and a legal opt-out gate (FastAPI, Vue 3). Live demo · Code |
 NainOrder E-commerce order engine on Clean Architecture, tactical DDD and CQRS (.NET). Live demo · Code |
 NainNotify Asynchronous email dispatch with the HTTP gateway separated from the worker (.NET, RabbitMQ). Live demo · Code |
 NainConfigurator Catalog-driven B2B product configurator with multi-company isolation (ASP.NET Core, React). Live demo · Code |
More projects (10)
| Project | What it is | Links |
|---|---|---|
| NainLegacyModernizer | Zero-downtime legacy .NET modernization harness. Strangler Fig reverse proxying via YARP with dual-write shadow running (.NET 10). | Code |
| nain-mcp-validator | Standalone Model Context Protocol (MCP) server for deterministic 3D mesh invariant checks (C1-C10) and content addressing. | Code |
| NainPolicy | Policy lifecycle API with per-organization isolation and optimistic concurrency (.NET 10, SQL Server, Vue 3). Uses synthetic data. | Live · Code |
| NainTAI | Civil service exam simulator with server-side marking and an offline-capable client (.NET 10, PostgreSQL, React 19). | Live · Code |
| NainDrive | Deterministic billing engine with decimal arithmetic that reconciles exactly (Python, Vue 3). | Live · Code |
| NainWrite | Spanish text rewriting workbench with semantic preservation checks (TypeScript, Web Workers). | Live · Code |
| HaveTickets | Cinema ticketing and seat reservation (.NET 10, Blazor WebAssembly). | Live · Code |
| GameHaven | Indie game storefront modernized from a desktop app to the web (.NET 10, Vue 3). | Live · Code |
| Orbe Runner 3D | 3D arcade runner without a game engine (TypeScript, Three.js). | Play · Code |
| Pong Arcade 3D | Browser 3D game with reproducible matches (TypeScript, Three.js). | Play · Code |
How I work
- Spec first. Every change starts in a specification, never directly in code.
- Nothing claimed without a test. A requirement without a test that proves it is not done.
- Human in the loop. AI agents act through MCP tools with deterministic checks and human approval, and fail closed when unsure.
Open to part-time, remote projects in backend and API development, legacy .NET modernization and deterministic validation.