Jonathan Sansó

Hi there!

Jonathan Sansó Ssr Full-Stack Developer (React-Next.js + Node.js) • Higher Degree in Programming

💻 Ssr Full-Stack Developer building multi-tenant SaaS and POS/Orders platforms with React, Next.js, TypeScript, backed by Supabase/PostgreSQL (RLS) and NestJS/Node.js.

Data integrity: stock/units, triggers, RPC workflows, and safe lifecycle flows (edit/void/restore) with idempotent adjustments.

Security-first delivery: MFA, CSRF, rate limiting, plus HMAC/JWT verification and secure integrations.

AI document automation: Python for OCR/NLP/STT to extract, summarize, and assist human review from real-world operational data.

Resume - C.V. Projects
profile picture

About me

🖐 Hi, I’m Jonathan Sansó

React · Next.js · TypeScript · Tailwind · Node.js · NestJS · Prisma · Supabase (PostgreSQL RLS) · Triggers/RPC · MySQL · MongoDB · Docker · NGINX · Debian · Git · GitHub · AWS (EC2, RDS, S3, CloudFront) · Terraform (IaC) · Python (FastAPI, Pandas) · AI (OCR/NLP/STT)

I build production-grade platforms end-to-end: frontend with React, Next.js, TypeScript and backend with NestJS/Node.js, plus Prisma and Supabase/PostgreSQL. I focus on clean architecture, maintainability, and fast, reliable delivery.

Multi-tenant SaaS: tenant isolation and role-based permissions with RLS/Policies, and data integrity via triggers, indexes and RPC workflows for stock/units and operational automation.

Security-first: MFA, CSRF, input sanitization, rate limiting, and hardened HTTP controls. I also build verification flows using HMAC + JWT for time-limited access and integrity checks.

I currently work on multi-tenant restaurant SaaS and institutional platforms with national scope in Argentina, delivering secure systems, automation, and operational tooling with a strong emphasis on reliability.

Skills

Technical skills

react next css bootstrap bootstrap typescript nest express git html5 html5 postgres

Soft skills

🤔

Problem analysis

🤓

agile learning

🤝

Collaboration

🧠

Logical thinking

📅

Planification and organization

🤜🤛

Teamwork

🎯

Tenacity

MY PROJECTS

[Private] Ocean Stack — Multi-tenant Restaurant SaaS

[Private] Ocean Stack — Multi-tenant Restaurant SaaS

Multi-tenant SaaS for restaurants & bars built with Next.js, TypeScript, Tailwind and Supabase/PostgreSQL (RLS, Policies, Triggers, RPC). Delivered back-office flows (products, ingredients, stock, counts, suppliers) and a resilient POS/Orders system with table sessions + split checks. Ensures tenant-safe isolation, role permissions, and strong stock integrity via transactional workflows and idempotent adjustments. Includes PDF/Excel exports and ES/EN i18n.


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Project: Social Basic — Technical Challenge

Frontend Instagram — Technical Challenge

Built with Next.js 15, Tailwind CSS 4, Redux Toolkit and TypeScript. A full social platform prototype featuring SSR + CSR hybrid rendering, Google OAuth authentication and persistent global state. Users can post, comment, like, save, and view a detailed profile activity history. Includes Storybook documentation and automated deployment with Vercel CI/CD.


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[Private] Public Web Verification Portal

[Private] Public Web Verification Portal

Developed with React (Vite), TypeScript, Tailwind, NestJS, Prisma, MariaDB, Docker and NGINX. Public extension of the institutional platform providing secure document verification for national and international entities. Implements CV + CRC validation (HMAC-SHA256), JWT view-grants (HS256), anti-exfiltration controls (copy, print, capture disabled), watermark overlay, and TipTap JSON → HTML rendering. Uses signed push API with HMAC, idempotency keys, and SHA-256 integrity checks.


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Platform for complex events V2

[Private] V.2: Platform for Complex Events

Lead developer of a national-scale internal platform across multiple penitentiary units. Replaced Excel workflows with a centralized MySQL database using Python (Pandas) ETL scripts to normalize raw Excel files and NestJS/Prisma import scripts to load structured data. Implemented dynamic forms with complex validations, modals, file uploads, and image croppers. Integrated Leaflet + Google Maps for event mapping and geospatial zones. Automated PDF/Excel/Word reports with statistical charts and temporal-spatial filters. Added WhatsApp alerts and coordination tools. Secure stack: TypeScript, Next.js, Tailwind, NestJS, Prisma, MySQL, Docker, NGINX on Debian. Includes Auth0 2FA, CSRF protection, session handling, input sanitization, rate limiting, and automated backups.


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Platform V1

[Private] V.1: Platform for Complex Events

Built with EJS, JavaScript, Bootstrap, Express, MySQL, Google Maps API and Auth0. Early version of the events platform enabling CRUD operations with multimedia content, downloadable as PDF or Word, and shareable via WhatsApp.


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VirtuaState Client

VirtuaState Client

Corporate client project built with HTML, CSS and JavaScript Vanilla. Focused on responsive layout, optimized media rendering, and brand-aligned UI/UX design.


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Ticket Platform

[Private] Ticket Platform for Internal Repairs

Built a ticket management system using PHP, SQL and Google Auth to coordinate IT hardware and software repairs within the company.


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React E-Commerce

React E-Commerce

Developed a ReactJS E-Commerce app using HTML, CSS, Bootstrap, JavaScript, React and Firebase. Features cart logic, real-time sync and modular components.


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+Art +Tech

+ Art + Tech

Designed a sound website and JavaScript Vanilla E-Commerce using HTML5, CSS3, SASS, and Bootstrap. Emphasis on UI animation and responsive performance.


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HomeSite

HomeSite for Company

Corporate website in progress built with HTML, CSS, Bootstrap and JavaScript, focused on clean responsive design and client brand integration.


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Backend Chat E-Commerce

Back-end Chat and Multi-user E-Commerce

Built a real-time E-Commerce chat with Node.js, Express, Handlebars, Socket.io, Bootstrap and JSON/MongoDB storage, supporting live product and message updates.


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Digital Library Project

Digital Library for Educational Client

Team project with Scrum Master, Project Manager, and Full Stack Developers. Built with HTML, CSS, Bootstrap, PHP, MySQL, and JavaScript. Enables digital book cataloging and student access management.


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