I build and run production SaaS on my own infrastructure: backend, frontend, database and deployment. Most of my work is a single operator carrying a system end to end: designing the schema, writing the API, shipping the UI, and keeping it alive on a server I administer myself.

Currently focused on multi-tenant SaaS, third-party API orchestration, and data pipelines that have to stay fast under real load.

crmsolid.com

Omnichannel CRM and outreach platform. Sole developer.

Five services behind Traefik on Docker: a .NET 8 API (EF Core + PostgreSQL, Redis, SignalR), a Next.js 15 / React 19 panel with its own design system, a landing site, a health monitor, and a .NET 9 / Photino desktop agent. Deployed from GitHub Actions with tests as a gate.

A few parts I'd point at in an interview:

• A 1.79M-row business catalogue built with DuckDB over Overture Maps parquet on S3. Querying the remote parquet directly did not stream: 2.5 GB of RAM and zero rows after fifteen minutes. Splitting it into a country download joined province by province brought the same query from 277 seconds to 15 milliseconds. Along the way: Overture ships 109 province rows for Türkiye rather than 81, and real company names contain lone surrogates that abort an Npgsql binary COPY unless they are sanitised first.
• An MCP server exposing the CRM's tools and prompts to LLM clients, with published .NET and Node SDKs.
• 516 unit tests over the parts that actually break: rate limiting and flood-wait backoff, outreach safety, email bounce detection, and agent routing.
• Payments and billing through LemonSqueezy and WeePay; integrations for ikas, WordPress and Zapier.

It is a modular monolith, not microservices. One deployable API with a few separate services around it. For a single maintainer that was the cheaper correct answer, and I can explain where I'd split it if the team grew.

Multi-tenant white-label platform.

Resellers host branded panels on their own domains from a shared database with row-level security. Custom DNS orchestration over PowerDNS and Nginx handles automatic SSL and routing, and the React frontend injects tenant branding at runtime from the request host.

Kernel patches that bring up speaker output on the Huawei MateBook HVY-WXX9 (AMD Renoir with an ES8316 codec the mainline driver does not wire correctly). DKMS packaged, GPL-2.0.