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Achievement: YOLOAchievement: QuickdrawAchievement: Pull Sharkx3Achievement: Pair Extraordinairex2

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estebankt/README.md

Mario Guillén

Senior .NET developer with a background in electronic engineering. I've spent the last 7 years building backend systems — mostly in C#, mostly for enterprise clients, and with a growing obsession for clean architecture (DDD, CQRS, event-driven patterns).

Currently working on SpendBear and exploring AI/ML more seriously. Based in Ecuador 🇪🇨

Projects

SpendBear

Personal finance app I'm building as a proper modular monolith — not a tutorial project. .NET 8, Next.js, PostgreSQL, Redis, Kafka, Auth0, and full OpenTelemetry observability. The kind of stack I'd pitch at work.

SonoLens

Upload a photo, get a Spotify playlist. Uses multimodal AI to read the mood of an image and curate music to match. Has a built-in web player so you don't have to leave the page.

Stack

Day-to-day: C# / .NET, TypeScript, Next.js, PostgreSQL, Redis
Architecture: DDD, CQRS, event-driven (Kafka), REST
Infra: Docker, Azure, GitHub Actions, Kubernetes
Also used: Python, Go, Sitecore, Contentful, Auth0

Links

mariocodes.space · LinkedIn

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  1. SpendBearBackEnd SpendBearBackEnd Public

    BackEnd of personal finance management system

    C#

  2. lazyarp lazyarp Public

    Rust 1

  3. SonoLens SonoLens Public

    SonoLens is a web application that transforms how users interact with music through visual and emotional cues. It generates a Spotify playlist after uploading an image.

    TypeScript

  4. toposApp toposApp Public

    A community-driven mobile application that serves as the definitive outdoor climbing guidebook, enabling climbers to discover areas, view detailed route topos, log their sends, and contribute to a …

    TypeScript