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Pedro Luis Ramos CallaPC
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Pedro Luis Ramos Calla

@pedroluisramoscalla

Fullstack developer at Lotifyx who scaled a marketplace backend to 200+ concurrent users without downtime.

Peru
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At Lotifyx, I refactored a legacy marketplace dashboard and scaled its backend from about three to more than 200 concurrent users without downtime. I also fixed an SQL injection vulnerability and migrated persistence to PostgreSQL.

At Coral Finance, I led the emergency migration from Fern to Conduit and Rain, integrating both payment APIs in five weeks. I also developed services for USDT and USDC payments, real-time webhooks, and balance monitoring.

At Flexbit, I built a crypto payment gateway for Smart+ using Node.js and TronWeb that reached 500–2,000 daily transactions. I also designed four domain-based microservices and integrated DIDIT KYC to onboard more than 1,000 users.

Across my work with BTRazer, Justo A Tiempo, and DevITM, I developed traceability, logistics, and payment systems. My personal projects include an event-driven payments backend on AWS Lambda and a TRON-based e-commerce platform.

Experience

Work history, roles, and key accomplishments

LO

Freelance Fullstack Developer

Lotifyx

Aug 2026 - Sep 2026 (1 month)

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.

FL

Backend Developer

Flexbit

Dec 2024 - Oct 2025 (10 months)

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.

JT

Freelance Fullstack Developer

Justo A Tiempo

Jul 2023 - Oct 2025 (2 years 3 months)

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.

BT

Fullstack Developer

BTRazer

May 2024 - Oct 2024 (5 months)

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.

DE

Backend Developer

DevITM

Jan 2023 - Jul 2023 (6 months)

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.

Education

Degrees, certifications, and relevant coursework

ME

Mundos E

Fullstack Diploma, Fullstack Development

Fullstack Diploma with 144 certified hours from Mundos E, completed in 2023.

UM

Universidad Nacional de Moquegua

Bachelor of Engineering, Systems and Computer Engineering

2016 - 2022

Bachelor of Engineering in Systems and Computer Engineering from Universidad Nacional de Moquegua, Peru, from 2016 to 2022.

KA

Krowdy Academy

Software Development Bootcamp, Software Development

Software Development Bootcamp with 35 certified hours from Krowdy Academy, completed in 2022.

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