pepesainz.dev

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< I build things that live in the internet. />

WHERE I'VE WORKED

Junior Front end developer

@ BBVA IT

Jan 2019 - April 2021

Collaborated with a 12-person team to develop and enhance real estate valuation and analytics solutions, integrating cutting-edge platform technologies.
Rebuilt an 8-year-old SaaS application using React 17, leading a full user experience redesign that resulted in the release of a beta MVP within 16 months.
Authored non-technical operational descriptions and workflows, ensuring seamless communication and functionality for non-technical stakeholders and reducing dependencies on technical teams.
Created comprehensive documentation for the company’s component library, significantly reducing onboarding time by eliminating the need for a 3-week training course.
Worked closely with Product Managers and Product Owners to ensure adherence to project timelines, resulting in a consistent reduction of 4 days in communication delays per project.

Front end developer

@ eDreams

April 2021 - October 2023

Developed and maintained high-performance front-end architecture using modern technologies such as ES6, JavaScript, TypeScript, ReactJS, and GraphQL.
Utilized testing frameworks and tools including Jest and React Testing Library to ensure code quality and application stability.
Colaborate in the styling and UI development efforts using SASS, CSS-in-JS, and styled-components, optimizing the user experience across various platforms.
Provided mentorship to junior developers, leading over 10 training sessions and facilitating skill development within the team.
Designed and developed a wide range of reusable components for the company's component library, contributing to scalable and maintainable UI solutions.

Product Engineer (Fe)

@ ioBuilders

October 2023 - Present

Led the development of the frontend of an NFT Marketplace from inception to deployment, ensuring a seamless user experience and high scalability.
Contributed to the development and maintenance of the company's design system, serving as the foundation for a consistent and reusable design system across products.
Developed and maintained two decentralized applications (dApps) on the Hedera blockchain, ensuring security, performance, and seamless integration with the platform.
Leveraged cutting-edge technologies including Next.js, TypeScript, Vite, Chakra UI... to build high-performance, scalable frontend solutions.
Collaborated closely with the design team to enhance the user interface and ensure alignment with business objectives and user needs, improving the overall quality of the products.

THINGS, I WORKED ON

BBVA Online Banking

React

lit-element

TypeScript

SASS

Web Components

A mobile & web app transforming everyday banking by enabling users to manage accounts, make transfers, and payments quickly and securely. Trusted by thousands of customers, it provides an intuitive and safe banking experience with biometric authentication and real-time notifications.

eDreams

React

lit-element

TypeScript

SASS

Web Components

A leading online travel agency offering deals on flights, hotels, car rentals, dynamic packages, and travel insurance. Headquartered in Barcelona, eDreams is one of Spain’s few unicorn companies, providing millions of travelers with convenient and affordable travel solutions through an intuitive and user-friendly platform.

OPIAC - Fondo INDII

React

TypeScript

Next.js

MapboxGL

An innovative blockchain platform supporting indigenous communities in the Colombian Amazon. Features an interactive map for exploring Amazon regions and purchasing NFTs, directly contributing to indigenous life plans, cultural preservation, and environmental conservation across 6 departments and 64 indigenous communities.

OpenBrick

React

TypeScript

Next.js

Contentfull

A revolutionary digital platform transforming real estate financing through tokenization. Features a regulated marketplace for issuing and trading tokenized securities, enabling broader investor access, efficient fundraising, and increased asset liquidity. Backed by industry leaders like BME, Renta4, and Garrigues.

ioPartners

React

TypeScript

Next.js

Contentfull

Landing page for a global leader in blockchain and DLT solutions, specializing in enterprise-grade systems for traditional finance and web3. The company delivers cutting-edge projects, scalable products, and innovative ventures across four key segments: Traditional Finance, Web3 Finance, Regulated Digital Trust, and Decentralized Trust.

ioBuilders

React

TypeScript

Next.js

Contentful

A leading blockchain technology company that builds enterprise solutions based on distributed ledger technology. With over 80 employees, 50+ delivered projects, and 30+ global clients including BBVA, BME, and CaixaBank. Specializes in strategic blockchain consultancy, digital assets, and deep tech innovation.

Madrid Yield Rent

React

TypeScript

Next.js

A pioneering real estate investment platform specializing in rental property management in Southern Madrid. The first SOCIMI (Spanish REIT) to be tokenized using DLT technology approved by CNMV, representing a major innovation in the real estate sector. Managed by Alquiler Seguro, offering a professional solution for rental property investment.

Hedera Stablecoin Studio

TypeScript

Solidity

React

Node.js

A comprehensive toolkit for creating and managing stablecoins on Hedera Hashgraph. Features smart contracts, SDK, CLI, and UI tools for deploying regulated stablecoins with multi-signature support, proof of reserve, and role-based access control. Used by developers worldwide to build secure and compliant stablecoin solutions.