Loading profile…
Pedro Luis Ramos Calla
Looking for a jobFreelance Fullstack Developer
Fullstack developer at Lotifyx who scaled a marketplace backend to 200+ concurrent users without downtime.
PeruFreelance Fullstack Developer at Lotifyx
Experience
Freelance Fullstack Developer
Refactored a multi-user dashboard and scaled the backend from ~3 to 200+ concurrent users. Fixed an SQL injection vulnerability and migrated persistence to PostgreSQL with TypeORM.
NodeJSTypeScriptPostgreSQLTypeORMCloudflare R2SecuritySQL
Backend Developer
Led emergency migration of payment provider from Fern to Conduit and Rain, integrating both APIs in 5 weeks. Designed and deployed Node.js/TypeScript/Express services for USDT/USDC payments and real-time webhooks.
NodeJSTypeScriptExpressJSRedisEC2VercelSupabasePayment IntegrationWebhooks
Backend Developer
Built a crypto payment gateway from scratch for Smart+ (Mexico) using Node.js and TronWeb, reaching 500–2,000 daily transactions. Designed a microservices architecture and integrated DIDIT KYC to onboard 1,000+ users.
NodeJSTronWebMicroservicesEC2NginxPM2CertbotKYCCrypto Payment Gateway
Freelance Fullstack Developer
Redesigned push notifications for 150+ delivery drivers using Redis queues, eliminating lost orders and reducing notification times. Integrated Stripe, PayPal, Sender, and Twilio for payments and transactional communications.
NodeJSExpressJSRedisFirebaseStripePayPalTwilioREST APIsVPS
Fullstack Developer
Transformed a basic traceability backend into a platform with authentication, data, and analytics. Designed the data layer and business logic to preserve product traceability and provide supply chain visibility.
NodeJSReactAuthenticationData ModelingAnalyticsSupply Chain
Backend Developer
Integrated Stripe and webhooks into an on-demand logistics platform to reliably confirm payments. Developed and documented REST APIs with Node.js, Express, and Swagger.
NodeJSExpressJSStripeWebhooksREST APIsSwagger
Education
Mundos E
Fullstack Diploma with 144 certified hours from Mundos E, completed in 2023.
Fullstack Diploma with 144 certified hours from Mundos E, completed in 2023.
Universidad Nacional de Moquegua
Bachelor of Engineering in Systems and Computer Engineering from Universidad Nacional de Moquegua, Peru, from 2016 to 2022.
Bachelor of Engineering in Systems and Computer Engineering from Universidad Nacional de Moquegua, Peru, from 2016 to 2022.
Krowdy Academy
Software Development Bootcamp with 35 certified hours from Krowdy Academy, completed in 2022.
Software Development Bootcamp with 35 certified hours from Krowdy Academy, completed in 2022.