Diego Perez Giordán — Backend Engineer

Background

I'm a Backend Engineer with 4+ years of experience, currently working at Cencosud (top-3 LATAM retailer). I build Go microservices for a multi-banner e-commerce platform that serves 5+ countries, optimizing highly concurrent APIs handling massive retail traffic.

Beyond my daily work, I contribute to Apache DataFusion in Rust, diving deep into columnar processing and high-performance execution plans. I strongly advocate for compile-time safety, clean architecture, and TDD.

Uruguay

Canelones

Core Technologies

Languages

Go (Production)
Rust (OSS & Personal)
Node.js / TS

Backend

gRPC & Protobuf
PostgreSQL & MySQL
Clean Architecture

Infrastructure

Docker & Kubernetes
GCP
Tilt & CI/CD

Environment

Linux (Arch)
Neovim / Zellij
Claude Code / Agents

Experience.

Backend Engineer

Cencosud S.A. — Digital Commerce

Dec 2025 — Present

Develop Go microservices and REST/gRPC APIs powering the WhiteLabel platform serving 5+ countries (Jumbo, Disco, Paris).
Migrated 15 legacy endpoints to a decoupled architecture, reducing response latency by up to 60% through concurrent execution with goroutines and semaphore-based rate limiting.
Apply TDD and clean architecture principles with PostgreSQL as the primary data store.

GogRPCKubernetesGCPPostgreSQL

QA Automation Engineer

Cencosud S.A. — Digital Commerce

Apr 2023 — Dec 2025

Designed and maintained automated test suites for multi-banner mobile applications across LATAM.
Built scripts and automated test flows that improved coverage and reduced regression cycle time.
Developed deep understanding of the platform's architecture and APIs, enabling a smooth transition into backend engineering.

QATest AutomationAPI Testing

Backend Developer Trainee

Cencosud S.A. — Digital Commerce

Aug 2022 — Apr 2023

Built REST APIs in Node.js (Express, Nest) with MySQL for the Paris Chile e-commerce platform.

Node.jsExpressMySQL

Open Source.

Active contributor to high-performance and privacy-focused tools in the Rust ecosystem. Focus on Apache DataFusion and ApiArk.

berbicanes/apiark

Active Core Contributor

Tauri Privacy-First API Client

10+ merged and open PRs to ApiArk — a lightweight Postman alternative with no cloud sync and low memory footprint (~60 MB). Implemented major features including the "open requests" tab system, gRPC server reflection discovery, custom borderless title bars, environment variable interpolation, and JSONC parsing support.

TauriRustTypeScriptgRPC

2-arg ceil() for Spark Compat

Extended datafusion-spark's ceiling function to accept a scale parameter (ceil(3.145, 2) → 3.15), matching Apache Spark SQL semantics exactly. Rewrote function signatures and dynamic return types.

RustSQLQuery Engine

apache/datafusion

Merged

Fix flaky sqllogictest filter

Made parallel aggregate plan tests deterministic by removing content-dependent snapshot assertions from DynamicFilter EXPLAIN outputs. Fixed same-day as reported.

RustTesting

Projects.

diegoQuinas/oxidia

Active

Oxidia Game Server

An Open Tibia server written in Rust (protocol 10.98, OTClient Redemption). Uses Tokio async runtime for networking, custom protocol packet handling, and highly concurrent in-memory world state management.

RustTokioMMORPG Architecture

Personal Learning

In Progress

Minifusion

Building a DataFusion-inspired analytical query engine from scratch in Rust. Focused on deepening my understanding of columnar memory processing, vectorized expression evaluation, and physical execution plans.

RustColumnar Databases

diegoQuinas/liturgia-horas-tui

Liturgia Horas TUI

Terminal UI application built in Rust for praying the Liturgy of the Hours. Offline-first design with a clean, fully keyboard-driven interface using Ratatui.

RustRatatuiTerminal UI

diegoQuinas/test_case_manager

Test Case Manager

CLI-based test case manager that generates clean Markdown and CSV reports. Built in Rust to bridge my QA automation background with systems programming.

RustCLITooling

Let's Connect.

diegoperezgiordan@gmail.com LinkedIn Profile GitHub @diegoQuinas Bluesky