Software Developer · IT Assistant at Kallifon — automation, integrations and internal systems for e-commerce, ERP and logistics.
My work starts with the process: understanding how it works, finding what creates unnecessary work, and turning it into something simpler, connected and easier to operate.
Build • Connect • Improve.
Automation built around a real e-commerce pricing workflow involving product references, color × size variants, stock validation and selective corrections.
The public reconstruction focuses on variant-level validation, stock-aware decisions, recovery after interrupted executions and verification after writes.
In the original workflow, 245 products were audited and 101 listings were corrected — each fix tested, validated and checked.
Python Selenium Pytest
Google Workspace automation built around an HR onboarding document workflow.
It validates spreadsheet records, organizes related documents in Drive and handles repeated executions without blindly recreating folders or shortcuts.
The public reconstruction uses synthetic records and also explores dry-run execution, partial failure recovery, concurrency protection and controlled error handling.
Google Apps Script Google Sheets Google Drive
A browser-based pricing engine that compares loyalty discounts, progressive pricing and a demonstrative PIX scenario.
The main challenge is in the business rules: discounts operate at different levels, cannot be stacked incorrectly, monetary rounding must remain consistent and independent scenarios need deterministic comparison.
The public repository is a portfolio reconstruction using synthetic products, prices and commercial rules.
JavaScript Playwright
A public reconstruction of a consignment workflow involving customers, sellers, batches, returns and pending balances.
The project started from the analysis of a real operational problem. During that analysis, an existing internal solution was identified that already addressed a significant part of the need.
The prototype still served its purpose: clarifying requirements, exploring the workflow and helping inform the final product decision instead of introducing another system unnecessarily.
HTML CSS JavaScript GitHub Actions
My final project for a technical degree in 2023, revisited in 2026 as a record of technical evolution.
The modernized version introduced prepared statements, password hashing, CSRF protection, authorization, transactional stock updates, Docker and HTTP integration tests with MariaDB.
The original academic version remains available under the v1-academico-2023 tag.
PHP MariaDB Docker GitHub Actions
IT Assistant
I joined Kallifon as an IT & E-commerce Intern and later moved into my current role as an IT Assistant.
Most of my work sits between software development and operations: understanding how an existing process works, identifying where systems or manual work create friction, and building tools or integrations around those problems.
That work has involved internal web applications, e-commerce and ERP workflows, APIs, logistics, commercial tooling and process automation.
Currently (private, company projects):
- Kallifon Rastreio — automated shipment-tracking notifications with the TOTVS ERP API, a persistent queue, deduplication and retries. In development.
- Kallifon Carreira — frontend of a recruiting platform in React, Next.js and TypeScript. In development.
- J&T Express integration — authentication, request signing and electronic invoice (NF-e) data. In staging.
- Commercial pricing calculator — isolated, tested discount rules. In production with Docker and Nginx.
Python JavaScript TypeScript React Next.js FastAPI Selenium Playwright Google Apps Script SQL Docker Nginx GitHub Actions REST APIs
Software Engineering — UniCesumar
Expected graduation: 2030
Technical Degree in Information Technology — EEEP Monsenhor José Aloysio Pinto
2023
Based in Sobral, Ceará, Brazil.