mjcr.dev

What It Is

mjcr.dev is first and foremost the personal full-stack developer portfolio of Manuel J. Coronilla, while also bundling a set of lightweight online developer and utility tools. The site presents the author as based in Spain and available for remote work, with a tech stack covering Angular, React, TypeScript, JavaScript, PHP, Node.js, Python, Flutter, C#/.NET, MySQL, Git, Docker, WordPress, and more.

Core Capabilities

Based on the crawled content, the online tools include a password generator, CSS gradient generator, CSS animation browser/preview/copy tool, regex tester, QR code generator, and PDF tools. The regex tool mentions 150+ examples and real-time highlighting; the QR code tool supports WiFi and vCard presets, custom styling, and logo overlay; the PDF tools cover merging, splitting, compression, rotation, watermarking, and page numbering. The PDF merge page specifically emphasizes that files never leave the device and are processed entirely locally in the browser, and notes that it is built with React, TypeScript, and pdf-lib. Another developer-oriented project is the open-source sftp-deploy, used for SFTP deployment of any web project, with SHA256 hash-based incremental deployment, local caching, and CI/CD compatibility.

Pricing and Openness

The site does not show subscriptions, paid plans, or payment methods. The PDF merge page title includes “Free” and states that no account or registration is required. On the open-source side, only sftp-deploy is explicitly marked as Open Source and provides a repository entry point; whether the other online tools are open source is not stated.

Pros and Cons

The advantages are its lightweight access, no registration requirement, and coverage of frequent small daily needs for developers. Local PDF processing is privacy-friendly, and sftp-deploy has practical value for small web projects that still rely on SFTP. The downsides are also clear: it is more like a personal portfolio with an attached toolbox than a full SaaS platform. It lacks APIs/SDKs, team collaboration, permission management, service SLAs, detailed documentation, and release notes. The limitations, browser compatibility, and maintenance cadence of the online tools are also not disclosed.

Who It’s For and Access from China

It is suitable for individual developers, frontend engineers, and design implementation staff who need to temporarily generate code snippets, debug regex, handle QR codes, or process PDFs. It may also suit developers looking for a simple incremental SFTP deployment solution. Access from mainland China cannot be determined from the crawled text; actual testing of domain connectivity and static asset loading is recommended.