# Backend technologies

Canonical: https://gaboesquivel.com/tech/backend

Technologies in the Backend area, each linked to project evidence on the site.

- [AI SDK](https://gaboesquivel.com/tech/ai-sdk): Vercel's TypeScript AI SDK for streaming conversations, tool calling, and model integrations in LegalAgent, Bitlauncher, and Masterbots.
- [Alchemy](https://gaboesquivel.com/tech/alchemy): Blockchain RPC infrastructure used for contract interactions, wallet operations, and EVM data access in Bitlauncher and Opyn.
- [Antelope](https://gaboesquivel.com/tech/antelope): Blockchain infrastructure used for EOSIO validators, exchanges, indexing services, smart contracts, and cross-chain applications.
- [Biometrics](https://gaboesquivel.com/tech/biometrics): Biometric identity and authentication integrations used in Wink's mobile banking application and Bitcash's authentication stack.
- [Content Management Systems](https://gaboesquivel.com/tech/cms): Content-management systems used to publish and maintain corporate websites, marketing content, and operational information.
- [C++](https://gaboesquivel.com/tech/cpp): C++ within EOSIO blockchain infrastructure and smart contracts, including validator software and onchain application logic.
- [Ethereum](https://gaboesquivel.com/tech/ethereum): Ethereum and EVM development spanning token contracts, NFT marketplaces, blockchain integrations, and trading applications.
- [Ethers.js](https://gaboesquivel.com/tech/ethersjs): Ethereum JavaScript tooling for wallet connectivity and contract interactions in NFT marketplaces and virtual-world applications.
- [Faye](https://gaboesquivel.com/tech/faye): Publish-subscribe messaging used to deliver live flight updates to ARINC Microfids' AngularJS information displays.
- [Foundry](https://gaboesquivel.com/tech/foundry): Solidity development and testing tooling used during Opyn Markets' smart-contract integration on Arbitrum testnet.
- [GraphQL](https://gaboesquivel.com/tech/graphql): GraphQL APIs and subscriptions for blockchain indexing, exchange data, onchain ratings, and application backends.
- [Hardhat](https://gaboesquivel.com/tech/hardhat): Solidity development tooling used for compiling and testing Bitlauncher's auction contracts before EOS EVM deployment.
- [JavaScript](https://gaboesquivel.com/tech/javascript): JavaScript engineering across interactive websites, client applications, realtime dashboards, and early full-stack products.
- [MongoDB](https://gaboesquivel.com/tech/mongodb): Document database used for Eat Arcade's subscription service and 4TIUS's wearable fitness-data tracking application.
- [Next.js](https://gaboesquivel.com/tech/nextjs): React application framework used for AI assistants, trading interfaces, auction platforms, NFT marketplaces, and virtual worlds.
- [NFT](https://gaboesquivel.com/tech/nft): NFT integrations across collectible marketplaces, virtual-world transactions, wallet interactions, and Flow minting applications.
- [Niftory](https://gaboesquivel.com/tech/niftory): NFT infrastructure used to mint AI-generated images on Flow in the Wizard World hackathon application.
- [Node.js](https://gaboesquivel.com/tech/nodejs): Server-side JavaScript runtime used for exchange backends, blockchain indexers, APIs, realtime services, and application infrastructure.
- [OpenAI](https://gaboesquivel.com/tech/openai): OpenAI models and APIs used for conversational assistants, realtime voice, document retrieval, and image generation.
- [Ponder](https://gaboesquivel.com/tech/ponder): Blockchain indexing framework used to transform Opyn's Arbitrum protocol events into queryable PostgreSQL data.
- [PostgreSQL](https://gaboesquivel.com/tech/postgresql): Relational database supporting trading applications, blockchain indexers, exchanges, and realtime application data.
- [Ruby on Rails](https://gaboesquivel.com/tech/rails): Ruby on Rails development for TiKR's dynamic-pricing commerce platform and ARINC's flight-information backend.
- [Redis](https://gaboesquivel.com/tech/redis): In-memory data infrastructure used within LegalAgent's AI application and administration services.
- [RxJS](https://gaboesquivel.com/tech/rxjs): Reactive stream processing used in ChainGraph's realtime EOSIO and Antelope blockchain data subscriptions.
- [Serverless](https://gaboesquivel.com/tech/serverless): Serverless application infrastructure for banking integrations, token services, and cloud-based backend applications.
- [Solidity](https://gaboesquivel.com/tech/solidity): Smart-contract development and integration for ERC-20 tokens, EVM auctions, and blockchain trading protocols.
- [Stripe](https://gaboesquivel.com/tech/stripe): Payment processing integrated into Eat Arcade's SMS-based restaurant ordering and subscription application.
- [Supabase](https://gaboesquivel.com/tech/supabase): PostgreSQL and realtime application services for auctions, indexed trading data, and browser-based signing workflows.
- [TanStack Query](https://gaboesquivel.com/tech/tanstack-query): Asynchronous data fetching and caching for AI applications, blockchain dashboards, auction interfaces, and trading systems.
- [TanStack Start](https://gaboesquivel.com/tech/tanstack-start): Full-stack React framework used for LegalAgent's administration dashboard, authentication, and document workflows.
- [Trigger.dev](https://gaboesquivel.com/tech/trigger): Background-job infrastructure used for Bitlauncher's auction processing and indexing workflows.
- [Twilio](https://gaboesquivel.com/tech/twilio): SMS messaging integration for Eat Arcade's daily restaurant offers and text-based subscription ordering flow.
- [TypeScript](https://gaboesquivel.com/tech/typescript): TypeScript application engineering across web, mobile, blockchain integrations, backend services, and AI-powered products.
- [Viem](https://gaboesquivel.com/tech/viem): TypeScript EVM client used for contract interactions, event indexing, wallet operations, and blockchain trading applications.
- [Wagmi](https://gaboesquivel.com/tech/wagmi): React hooks for EVM wallet connectivity, contract interactions, and token balances in Opyn and Bitlauncher.
- [WebAuthn](https://gaboesquivel.com/tech/webauthn): Browser authentication and cryptographic key management used for Bitcash's transaction-signing experience.
- [WordPress](https://gaboesquivel.com/tech/wordpress): Content management and frontend development for editorial, corporate, community, and patient-education websites.
- [Zod](https://gaboesquivel.com/tech/zod): TypeScript schema validation for application inputs, API payloads, and configuration across Next.js products.