alysson victoria
@alyssonvictoria
I build scalable fintech platforms for payments, banking, and crypto wallets.
BrazilWhat I'm looking for
I build and maintain mission-critical financial systems, including Banking-as-a-Service platforms, international payments, and crypto wallets processing millions in monthly transaction volume.
At Onda Finance, I develop full-stack fintech applications with React, Node.js, Express, TypeScript, AWS, REST APIs, CI/CD, and automated testing. I've also delivered secure payment integrations for Stripe, PagBank, and Mercado Pago, plus CNAB 240/400 processing for reconciliation and financial batch workflows.
I've modernized legacy systems, contributed PHP improvements to OpenBoleto, and worked on scalable rAthena server systems using C++, MySQL/MariaDB, Linux, and Git. I use AI-assisted engineering, agent orchestration, and Spec-Driven Development to accelerate delivery while maintaining quality and test coverage.
Experience
Work history, roles, and key accomplishments
Full-stack development and maintenance of financial applications focused on crypto wallets and international payments. Experience in developing new functionalities, financial integrations, and supporting high-availability systems in the fintech sector.
Main Activities and Technical Skills:
• Development of applications using React, Node.js, Express, and TypeScript;
• Implementation and maintenanc
Full Stack Developer (Freelancer)
• Payment Gateway Integration: Implemented various payment APIs (Stripe, PagBank, Mercado Pago), ensuring secure checkout flows and webhook management for real-time transaction processing.
• CNAB Data Processing: Developed systems for reading and generating CNAB 240/400 files, automating bank reconciliation and financial batch processing.
• Refactoring & Troubles
Full-stack development and maintenance of financial systems for a digital white-label bank (BaaS). Responsible for implementing new features and sustaining complex systems in the financial sector.
Main Activities and Technical Skills:
• Development and maintenance of fintech solutions using PHP (Yii2), React and Node.js;
• CI/CD pipelines and automation using Bitbucket;
• Package management and t
Software Developer (Open Source) | OpenBoleto
• Fintech & Payment Systems: Contributed to the OpenBoleto project, an open-source library for generating Brazilian bank slips (Boletos) in compliance with FEBRABAN standards.
• Layout Correction Feature: Developed and successfully merged a feature to fix the HTML-generated layout, ensuring visual consistency and accuracy according to banking requirem
Full-stack development role at a consulting services company.
Software Developer (Open Source) | rAthena Project
• C++ Development: Acted in the development and customization of rAthena, a high-performance emulation framework for MMORPG servers.
• System Architecture: Analysis and modification of source code in distributed systems (Login, Char, and Map servers), focusing on scalability and low latency.
• Data Management: Management and optimization of relat
Education
Degrees, certifications, and relevant coursework
Instituto Federal de Educação, Ciência e Tecnologia de São Paulo - IFSP
Análise de Sistemas de Computação, Análise de Sistemas de Computação
2022 - 2025
Universidade Estadual do Maranhão
Bacharelado em Engenharia, Engenharia Civil
2017 - 2019
Completei as disciplinas base na área de exatas de engenharia como Cálculo, Física, Algebra Linear, Probabilidade e Estatística, assim como algumas disciplinas específicas envolvendo desenho (AutoCAD) e física aplicada a estruturas.
Availability
Location
BrazilAuthorized to work in
Job categories
Skills
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