Guillem – Golang, React, Next.js

An online platform designed to assist students in preparing for university entry exams. It offers a suite of study resources, tutorials, and practice materials to help learners enhance their understanding and ace their tests. The platform provides a tailored learning experience with accessible and structured content that's geared toward achieving academic goals.

• Managed a rewrite of the frontend into a decoupled SPA architecture;
• Removed tedious manual jobs using OpenAI chat models;
• Mitigated account sharing using session tracking and device management;
• Integrated with Vimeo video.

This is a data streaming tool for software and data engineers, powered by Meroxa. Its purpose is to help you move data from A to B. You can use the tool to send data from Kafka to Postgres, between files and APIs, between supported connectors, and any data store you can build a plugin for.

Guillem maintained many connectors and processors for the project.

• Built conduit-connector-mysql; it included database locking, opencdc position restoring, and many more features. For reference, this connector competes with mysql debezium;
• Developed and updated 10+ connectors;
• Learned how to use many different queue systems like pulsar, rabbitmq, kinesis;
• Learned how to work in an open-source environment.

B2B ecommerce analytics tool that helps companies such as MercadoLibre and Black & Decker manage and track tens of thousands of product prices. With Spiral Pricing, sellers can study price changes in real time, enabling them to have great market insights in a short amount of time.

• Helped grow the product from a few users to tens of sellers;
• Built a full-stack app with better perceived UX than the previous legacy monolith;
• Trippled the speed of multiple background jobs;
• Integrated with axiom.co to facilitate comprehensive application monitoring and performance analysis;
• Wrote unit and integration tests.

The ideal solution to track current analytics in the MercadoLibre marketplace. Sellers could easily track what was trending in each category and could measure their own sales performance.

• Built extremely performant analytics queries on millions of customer orders;
• Successfully delivered a full-stack web app in time and helped achieve 5k MRR;
• Built concurrent download algorithms to achieve high write throughput;
• Iterated through many UX designs;
• Integrated with Mercadolibre Oauth system.