Fernando Callata

Senior Software Engineer architecting distributed systems that scale in production.

From payroll platforms processing millions in daily transactions to cloud-native integration services — I design and own backend systems across financial services, HCM, and platform engineering using .NET, Node.js, TypeScript, AWS, and Azure.

Trusted by teams at

Dev.Pro / HeartlandWEXEDPUltragazHurbMercado EletrônicoTEAM InternationalHiper

At a Glance

10+ Years

Experience

Core Stack

.NET, Node.js, TypeScript

Cloud Ready

Azure + AWS

Global

Remote-Ready

Selected Highlights

See full history

Senior Software Engineer

Dev.Pro

2022-10 — Present

Own the backend architecture for Auris (formerly Heartland), a payroll platform serving enterprise clients — responsible for service reliability, system design decisions, and production incident resolution.

Senior Software Engineer

TEAM International

2022-08 — 2023-01

Designed a production-grade internationalization framework supporting multiple languages, currencies, and regional compliance — built as a platform capability rather than a per-feature implementation.

Senior Software Engineer

WEX

2021-11 — 2022-08

Resolved critical file-system management vulnerabilities in a high-volume payment pipeline, achieving zero transaction failure rate and full data integrity under load.

Featured Projects

View all projects

Declare Bem

Jan 2022 - Dec 2022

A mobile app to help Brazilian tax payers declare their income to the government at the end of the year.

MobileTaxBrazilFlutter

Jacare Cripto

Aug 2025 - Dec 2025

A bot to monitor crypto currencies and send buy/sell signals on Telegram.

PythonCryptoTrading BotTelegram

Latest Article

View all articles
·7 min read Featured

Node.js Event Loop: The DJ That Never Stops Playing

Node.js is single-threaded — but somehow handles thousands of operations at once. Learn how the Event Loop, Call Stack, and task queues work together, explained through the lens of a DJ at a party.

Node.jsJavaScriptEvent LoopAsyncBeginners
Read article
F
Fernando Callata

© 2026. Excellence in first place.