Software
Engineer and
Designer

for lack of a better word...

with over 7 years of experience building for start-ups in San Francisco, London, Amsterdam, and Barcelona.

Me

what I've built

2025

vanityLabs, an Open Source alternative to outrageously overpriced Hootsuite

Open-source social media management platform designed as an alternative to Hootsuite for most common use cases of non-corporate users, enabling multi-channel orchestration via API integrations with platforms like X, LinkedIn, and Instagram. Built on a microservices architecture, it supports OAuth2 authentication, cron-based scheduling, and real-time analytics with WebSocket-driven dashboards. Containerized deployment (Docker/Kubernetes) for scalable, fault-tolerant workflows.

SelfSend, an Open Source Email Service Provider Up to 6x more cost-effective than Mailchimp

Open-source, self-hosted email platform deployable on AWS, offering a cost-effective (up to 6x cheaper) alternative to Mailchimp, Mailjet or Sendgrid. It addresses technical pain points like complex API integrations, limited deliverability controls, and lack of infrastructure transparency with easy deployment, robust domain authentication (SPF, DKIM, DMARC), and real-time analytics. Designed for users prioritizing control, scalability, and affordability.

2024

UX/UI themes on iamtonysanchez.com/art

ecommerce platform specializing in pixel-perfect web app templates engineered to achieve perfect 100 scores across all Lighthouse categories (Performance, Accessibility, Best Practices, SEO). Built with modern frameworks like Next.js and Tailwind CSS, each template is optimized for Core Web Vitals, responsive design, and semantic HTML, ensuring blazing-fast, accessible, and SEO-friendly websites out of the box. Custom payments gateway integrating Stripe and PayPal APIs, with full control over the checkout flow. More than 120 daily visits.

2023

Writefull, AI for academic writing

Global leaders on AI for academic writing years earlier than Chat-GPT release and trusted by Cambridge University Press and others. Natural language processing (NLP) to deliver real-time, context-aware writing enhancement for technical and academic texts. Integrated with IDEs and text editors via APIs, as well as Microsoft Word and Overleaf. It provides syntax correction, paraphrasing, and terminology suggestions. Built on transformer architectures with fine-tuned language models trained with millions of published papers, it supports LaTeX and Markdown workflows.

UI-Sora & npm package `components-library-boilerplate`

npm package providing a modular, extensible boilerplate for scaffolding React component libraries. It integrates Rollup for tree-shakable ES modules, TypeScript for type safety, Jest/React Testing Library for unit testing, and Storybook for UI documentation. Preconfigured with ESLint, Prettier, and GitHub Actions CI/CD, it supports CSS-in-JS, theming, and atomic design principles for scalable, production-ready libraries. More than 1,000 downloads accumulated.

2022

Folio Wallet and other blockchain solutions by Smartmatic

Technology used in the US elections, Italy regional elections, Philippines and other global governments. Decentralized, non-custodial wallet leveraging smart contracts and Web3.js for seamless interaction with blockchain networks. Built with zero-knowledge proofs (ZKPs) for enhanced privacy, it offers secure key storage, and cross-platform compatibility (iOS, Android, web app and browser extensions).

2021

eEvidence, global leaders on email certification

Platform for email certification and eSignature solutions, leveraging PKI (Public Key Infrastructure) and blockchain-based timestamping for tamper-proof document integrity. It complies with eIDAS regulations, offering AES-256 encryption, multi-factor authentication (MFA), and audit trails for legal admissibility. Trusted by enterprises worldwide, it ensures seamless integration with enterprise systems via RESTful APIs and supports cross-border eSignature workflows with advanced biometric verification.

2020

Browser-Based Network Packet Sniffer

Cutting-edge TypeScript-powered tool designed to intercept, analyze, and visualize HTTP/HTTPS and WebSocket traffic in real-time. Leveraging the Service Worker and Performance APIs, it captures request metadata, headers, and payloads, enabling deep packet inspection. With advanced filtering, real-time updates, and export capabilities, designed for debugging, security auditing, and optimizing web applications.

2019

Internal tool for corporate use in ETL Global

A high-performance, data-intensive solution for automated ledger balancing, tax compliance, and multi-currency support, built on double-entry accounting principles. Features a secure, robust database architecture with AES-256 encryption, TLS 1.3, and Redis caching for optimized performance. Supports real-time forex aggregation and dynamic tax computation. Scalable via sharding and microservices.

2018

API consuming Hobby Web App for Tourism

Integrates with the Viator API to provide a unified platform for searching, comparing, and booking global attractions. Built with GraphQL for efficient data fetching, it features real-time availability checks, dynamic pricing comparisons. Mobile-friendly UX.