Álvaro Carvajal Castro

Idle web browser game with a backend made in Go. Actor based game state handling users with periodic saves to a fine-tuned MySQL setup with replication. Handling more than 20,000 concurrent users with a single backend service using an actor model.

Worked on some game systems and mainly the whole backend architecture. Sharing user states between multiple backend instances using Redis. Simulating more than 24 hours of game time in less than 30 milliseconds.

Immutable zkEVM block explorer for RavenQuest. Tracks every single log emitted by any of the game related smart contracts. Token transfers, Seaport sales, mints, etc.

Every asset metadata is stored and parsed in real-time, all blocks are indexed and bloom filters are used to quickly search for game related logs. Tracking all transactions and blocks in real-time.

SaaS remote team synchronization tool. Timezone IANA database parsing, timezone synchronization for more than 339 timezones, timezone shapefile parsing for coordinate lookup in real-time (latitude and longitude based).

Backend made using Laravel, timezone parser made in Go, it was deployed on AWS Beanstalk. Frontend with Vue.js.

IANA tab and shapefile parsing tool. Provides timezone UTC offsets and the current time for every timezone in the database.

Quickly look up timezone information using multiple parameters including timezone name, country code and UTC offset. Made in Go with a Cloudflare Workers frontend.

Leading Blockchain development team. Focused on Ethereum and EVM compatible chains with a Go backend. Made smart contracts for land sales, NFTs, ERC20 tokens, handled more than 1,000,000 USD in transaction volume.

Implemented custom NFT and token ownership model allowing users to quickly transfer ownership of their assets between in-game and the blockchain.

Backend development and server management. Handling multiple public facing servers handling more than 1 million monthly requests. Implemented multiple API integrations, including Twitch Drops for streamers handling campaigns and drops with more than 45,000 unique viewers.

Handling payments with multiple gateways. Achieved high AWS SES deliverability rate sending more than 30,000 monthly emails. Multiple backend services interconnected with the game servers, player loading/unloading, marketplace analytics, etc.

Full website backend and frontend made in Go. Stripe integration for payments, real-time shipping quotes using UPS and DayAndRoss APIs.

Implemented dealer locator using Google Maps API. Dealers portal for managing orders and quotes. Simple CMS for managing pages and news.

Full website backend and frontend made in Go. Implemented custom CMS for managing news, pages, and store items. Added multiple payment gateways for purchases, including PayPal, PIX, PagSeguro and Coinbase.

Systems handling more than 100,000 USD in monthly transactions during peak seasons. Backend handling more than 50,000 monthly users, reaching more than 1,000 concurrent users.