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Alexandre EstanislauAE
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Alexandre Estanislau

@alexandreestanislau

I build secure payment platforms spanning POS firmware, cloud backends, and fintech infrastructure.

Brazil
Message

I've built payment technology across Geopagos, Hash, Perto, and Sicredi, from high-throughput Go microservices and serverless backends to mission-critical POS applications. At Geopagos, I led an acquired fintech platform migration to GCP with zero downtime, built GitHub Actions CI/CD pipelines, and executed cloud migration strategies between GCP and AWS.

My work bridges embedded security and cloud systems: EMV L1/L2 certifications, PCI-aligned firmware, Linux kernel drivers, ISO 8583, DUKPT, TR-31, Go, AWS, GCP, and PostgreSQL. I also mentor engineers, lead architecture decisions, resolve technical blockers, and help teams deliver resilient payment platforms.

Experience

Work history, roles, and key accomplishments

Geopagos logoGE

Technical Lead

Jan 2023 - Aug 2024 (1 year 7 months)

- Technical Leadership: Mentored the engineering team, conducted code reviews, and resolved critical technical blockers to ensure delivery timelines

- Platform Migration: Led the migration of an acquired fintech platform to a new infrastructure on GCP, ensuring zero downtime.

- DevOps: Designed and implemented CI/CD pipelines using GitHub Actions to automate deployment

- Cloud Strategy: E

A. E. Puhl logoAP

Senior Software Engineer

Aug 2022 - Nov 2022 (3 months)

- Consultancy: Provided specialized consultancy for sub-acquiring operations, ensuring business continuity and leading the migration strategy to a modern platform.

Hash logoHA

Software Developer

Mar 2020 - Jul 2021 (1 year 4 months)

- Golang Backend: Designed and implemented high-throughput microservices for the Payments Infrastructure using Go.

- POS Architecture: Developed POS applications and supported complex L3 certifications, ensuring compliance with payment schemes.

- Team Leadership: Served as the Technical Lead for the Terminals Team, guiding the development roadmap and prioritizing features.

Grupo ICTS logoGI

Senior Software Developer

Jan 2019 - Mar 2020 (1 year 2 months)

- Embedded Linux: Developed and troubleshoot complex Linux kernel drivers, ensuring stability for hardware integration.

- Firmware Security: Developed firmware components for the MAX325xx secure MCU family using FreeRTOS, focusing on security and real-time performance.

- Hardware Integration: Collaborated closely with the hardware engineering team to optimize device performance and reliability.

Sicredi logoSI

Senior Software Developer

Aug 2017 - Dec 2018 (1 year 4 months)

- Backend Development: Developed scalable Java backend services for banking solutions.

- Agile Collaboration: Supported the Product Owner and Team Lead in backlog refinement and sprint planning to improve delivery velocity.

Perto S.A. logoPS

Software Developer

Mar 2010 - Jul 2017 (7 years 4 months)

- Embedded Development: Developed mission-critical applications, libraries, and device drivers for POS systems using C/C++ and Embedded Linux.

- EMV Certification: Led the complex certification processes for EMV Level 1 & 2 (Contact/Contactless) across major schemes (MasterCard PayPass, Visa PayWave, AMEX ExpressPay, Discover ZIP).

- Security & Cryptography: Implemented robust key management alg

Ponfac S/A logoPS

Free Lancer

Jan 2007 - Jan 2009 (2 years)

- Computer Vision: Developed image processing algorithms for shape detection and surface classification in the wood processing industry.

- Automation: Created document parsing applications to automate legal notice advisories for corporate clients.

Education

Degrees, certifications, and relevant coursework

UN

Unisinos

Information Systems (coursework, incomplete), Computer Systems Analysis/Analyst

UN

Unisinos

Computer Systems Analysis/Analyst, Information Systems

1999 -

Pursued coursework in Information Systems and Computer Systems Analysis/Analyst.

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