Marez Code
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Marez Code — Javier Martínez López

Software developer specialized in .NET and Blazor

I build web applications, PWAs and cross-platform solutions with C#, Blazor, Blazor MAUI, ASP.NET Core, REST APIs and databases.

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C# / .NETBlazorPWABlazor MAUIASP.NET CoreSQL Server

Since 2018Building and evolving web solutions.
Own productsReal applications in production and internal beta.
Web and cross-platformBlazor, PWAs and Blazor MAUI when they fit.
End to endBackend, data, authentication and integrations.

Product and architecture

Software you can open, use and explain

The main case studies cover technical decisions, behavior and real limits, without invented numbers or template screenshots.

Pagueo: A PWA for organizing shared expenses and payments, with offline work and synchronization when connectivity returns.
Own product · Production.NET · Blazor WASM · PWA · IndexedDB

Pagueo

A PWA for organizing shared expenses and payments, with offline work and synchronization when connectivity returns.

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Latens Chat: Private, ephemeral messaging without registration, with encryption on devices and a relay that cannot read content.
Own product · ProductionASP.NET Core · SignalR · X3DH · Double Ratchet

Latens Chat

Private, ephemeral messaging without registration, with encryption on devices and a relay that cannot read content.

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It normalizes locations, queries authorized sources and connects results in a map viewer.
Own product · Internal betaBlazor WASM · PWA · ASP.NET Core · SQL Server

LocTer

It normalizes locations, queries authorized sources and connects results in a map viewer.

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It detects opportunities, proposes content and requires human approval before generation and publication.
Internal tool · ExperimentalBlazor Server · ASP.NET Core · EF Core · OpenAI API

SEO content with OpenAI

It detects opportunities, proposes content and requires human approval before generation and publication.

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Expertise

Connected capabilities, not a logo wall

I work from the interface and offline experience through the data model, authorization and deployment.

01

.NET and Blazor

Blazor Server and WebAssembly for maintainable, product-focused applications.

02

PWAs and Blazor MAUI

Installable experiences, offline work and hybrid cross-platform solutions.

03

APIs and integrations

ASP.NET Core REST APIs connecting clients, data, services and processes.

04

Data and EF Core

SQL Server, modeling, queries, migrations, synchronization and processing.

05

Identity and permissions

Identity, JWT, roles and authorization tailored to each solution's risk.

06

SaaS and multi-tenant

Users, permissions, dashboards and logical isolation for business software.

07

Privacy and real time

Data minimization, SignalR, WebSockets and explicit data lifecycles.

08

Modern web

Native HTML, CSS and JavaScript with performance, accessibility and technical SEO.

09

WordPress as a complement

WordPress and WooCommerce when content or commerce calls for them.

Non-public work

Private business software development

Alongside visible products, I build web applications, PWAs and Windows applications with Blazor MAUI, backed by ASP.NET Core and SQL Server. This experience is presented without identifying companies, industries, clients or modules.

  • 01Web and Windows applications
  • 02Data processing and validation
  • 03Import, export and synchronization
  • 04Roles, permissions and technical traceability
  • 05Automation and document generation
  • 06Error handling and integrations

Backend

APIs as a cross-cutting specialty

I develop REST APIs with ASP.NET Core to connect Blazor applications, PWAs and Blazor MAUI with databases, external services and internal processes. I implement queries, validation, data transformation, document generation, automation and integrations tailored to each solution.

Simplified architecture
Simplified architecture

Stack

Technology grouped by responsibility

Applications

  • C#
  • .NET
  • Blazor Server
  • Blazor WebAssembly
  • PWAs
  • Blazor MAUI

Backend

  • ASP.NET Core
  • REST APIs
  • SignalR
  • WebSockets
  • Integrations
  • Automation

Data and access

  • SQL Server
  • Entity Framework Core
  • IndexedDB
  • Identity
  • JWT
  • Roles and permissions

Web

  • HTML5
  • CSS
  • JavaScript
  • Responsive
  • Accessibility
  • Technical SEO

Complementary web work

Three public sites with different goals

Selected web projects shown as complementary work. The portfolio's primary focus is .NET software and own products.

Working approach

From problem to production system

01

Analysis

Clarify the problem, data, constraints and success criteria.

02

Architecture

Define boundaries, flows, permissions and maintainable decisions.

03

Development

Build complete journeys with tests proportional to risk.

04

Evolution

Deploy, observe, correct and document while preserving rollback.

Profile

From traditional web to .NET software

I have built web solutions since around 2018. My earlier work included more WordPress and traditional web projects; today my work centers on C#, Blazor, PWAs, Blazor MAUI, APIs and data. I develop and collaborate remotely on projects from analysis and architecture through deployment and evolution.

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Shall we discuss the solution you need to build?

Share the context, constraints and current state. The conversation starts with the problem, not a predetermined technology.

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