cross-platform SaaS and mobile products with Flutter, Next.js, and Spring Boot. Our stack includes AWS, Auth0, Clerk, Pinecone, and PostgreSQL. Our clients range from fintech startups to enterprise tokenization projects across LATAM, Europe, and the US. Founded in 2020 by a team with prior exits — Educatina, a Latin American edtech platform sold to Competir, and Kadabra, a last-mile logistics platform sold to Glovo/Delivery Hero — 42i has delivered production systems including compliant security token platforms, crypto Visa card apps, AI-powered visual recognition marketplaces, and Instagram automation SaaS tools. In blockchain and tokenization, 42i builds end-to-end infrastructure for regulated digital assets: smart contract development with ERC-3643 (T-REX) for compliant security tokens, Fireblocks SDK integration for institutional-grade custody and transaction signing, KYC/AML workflows with Sumsub and ZoomSub, and stablecoin card issuing through Rain's Visa infrastructure. We have production experience across Ethereum, Base, Arbitrum, Optimism, Polygon, Solana, and Tron. In mobile and SaaS development, 42i delivers cross-platform applications with Flutter for iOS and Android, web applications with Next.js and React, and backend systems with Spring Boot and Node.js. We handle the full product lifecycle from architecture and UX design through App Store and Play Store deployment, including real-time messaging infrastructure, AI-powered features with vector search and LLM integration, and payment systems with Stripe. 42i works with fixed-price contracts structured around milestones, serving clients remotely across multiple time zones. Our team combines deep technical seniority with a lean operating model — no junior handoffs, direct access to senior engineers and founders on every project.