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I am a Full Stack Engineer with over a decade of experience in designing and securing mission-critical, scalable enterprise systems. My expertise lies at the intersection of robust back-end engineering, data security, and financial operations, making me adept at analyzing and integrating complex components like payment processors. I have a proven track record of implementing secure, compliant, and resilient solutions, including direct experience with POS systems and developing PII-scrubbing proxies to protect sensitive data in regulated environments.…I am a Full Stack Engineer with over a decade of experience in designing and securing mission-critical, scalable enterprise systems. My expertise lies at the intersection of robust back-end engineering, data security, and financial operations, making me adept at analyzing and integrating complex components like payment processors. I have a proven track record of implementing secure, compliant, and resilient solutions, including direct experience with POS systems and developing PII-scrubbing proxies to protect sensitive data in regulated environments.

Javier Martinez

Developer, Programmer, Full Stack Developer

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I am a Full Stack Engineer with over a decade of experience in designing and securing mission-critical, scalable enterprise systems. My expertise lies at the intersection of robust back-end engineering, data security, and financial operations, making me adept at analyzing and integrating complex components like payment processors. I have a proven track record of implementing secure, compliant, and resilient solutions, including direct experience with POS systems and developing PII-scrubbing proxies to protect sensitive data in regulated environments.…I am a Full Stack Engineer with over a decade of experience in designing and securing mission-critical, scalable enterprise systems. My expertise lies at the intersection of robust back-end engineering, data security, and financial operations, making me adept at analyzing and integrating complex components like payment processors. I have a proven track record of implementing secure, compliant, and resilient solutions, including direct experience with POS systems and developing PII-scrubbing proxies to protect sensitive data in regulated environments.

Available to hire

I am a Full Stack Engineer with over a decade of experience in designing and securing mission-critical, scalable enterprise systems. My expertise lies at the intersection of robust back-end engineering, data security, and financial operations, making me adept at analyzing and integrating complex components like payment processors. I have a proven track record of implementing secure, compliant, and resilient solutions, including direct experience with POS systems and developing PII-scrubbing proxies to protect sensitive data in regulated environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

Spanish; Castilian

Fluent

English

Advanced

Work Experience

Principal Engineer & Solutions Architect at Independent Professional

December 1, 2025 - Present

Ensured Enterprise Security & Compliance (SOC2/HIPAA): Engineered a fail-secure Data Loss Prevention (DLP) proxy using Microsoft Presidio for real-time PII scrubbing, enforcing application-level encryption for all sensitive data at rest to meet strict regulatory requirements. Implemented Distributed System Resilience (SRE): Deployed enterprise stability patterns, including Redis-backed distributed circuit breakers to prevent cascading failures during vendor outages. Optimized System Cost & Performance: Designed intelligent routing logic to dynamically select optimal compute resources based on real-time budgets, significantly reducing operational costs. Built High-Performance Data Pipelines: Developed asynchronous data ingestion and processing pipelines using FastAPI and Arq.

Technical Product Manager at Freelancer

September 1, 2017 - December 1, 2025

Managed the full software development lifecycle (SDLC) for digital products, from system analysis and requirements gathering to deployment and iterative improvement. Implemented data analytics dashboards to monitor key performance indicators (KPIs) and optimize system performance.

Logistics and Operations Automation at Freelancer

July 1, 2019 - May 1, 2024

Designed and deployed RPA workflows to automate inventory management and supply chain logistics. Implemented real-time KPI dashboards to monitor profit margins and optimize stock turnover.

Technical Developer at Reading Room

December 1, 2014 - October 1, 2015

Built, deployed, and maintained web projects as a .NET Programmer. Improved the design and usability of existing web pages as a Front-End Programmer.

Junior Software Engineer at Cetel Systems Engineering

October 1, 2012 - August 1, 2013

Installed and implemented a Point-of-Sale (POS) system, managing system configuration and data interfaces. Designed, modeled, and implemented databases and interfaces for various web projects using ASP.NET.