👋 Hi, I'm

Martin Penabad

Backend Engineer

Building backend systems and payment infrastructure that power financial transactions.

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01.

About Me

Hi, I'm Martin—a backend engineer passionate about building systems that power the digital economy.

With over a decade in software development, my journey has taken me from building mobile apps and interactive kiosks to architecting payment infrastructure that processes transactions at scale. Since 2014, I've also been helping businesses grow through freelance web development, crafting custom WordPress solutions and e-commerce platforms. Today, I specialize in backend engineering for fintech, where I design and build the secure, reliable systems that enable seamless financial transactions.

I thrive on tackling complex technical challenges and staying ahead of the curve with emerging technologies. When I'm not engineering payment systems or exploring the latest in AI, you'll find me developing game servers, tinkering with Linux, pushing my physical limits with cross training, or breaking things in my homelab to figure out how they really work.

🎮 Game Servers🐧 Linux & Homelab🤖 AI Exploration

Technical Skills

C# / .NET 90%

Java 85%

Relational Databases 85%

Swift 80%

Android Development 75%

JavaScript 70%

AWS Cloud Services 70%

Kotlin 70%

Education & Languages

Certificate in Advanced Java Programming

Fundación Confemetal • 212 hours • 2013

Software Development (CFGS)

San Clemente • Santiago de Compostela, Spain • 2013

Languages

English & Spanish (Native) • Galician (Working) • Portuguese (Conversational)

02.

Projects

Fraud Detection & Compliance Platform

Maintained and enhanced fraud detection and compliance monitoring system for UK-based fintech client. Implemented real-time fraud prevention features and regulatory compliance tools with CI/CD pipeline automation.

C#.NETAWSDockerPostgreSQLJenkins

Gift Recommendation Mobile Platform

Co-founded and built cross-platform mobile application for creating gift recommendation engine. Developed iOS and Android native apps with backend API services and cloud infrastructure on Azure.

JavaKotlinSwiftNode.jsFirebaseAzure

Healthcare Integration System

Designed custom Java frameworks for Galician Government health agencies. Built HL7 messaging integration channels using Mirth Connect for seamless data exchange between healthcare organizations.

JavaMirth ConnectHL7PostgreSQLJasper Reports

Interactive Kiosk & Queue Management

Developed enterprise software for healthcare organizations and government agencies. Built interactive kiosk systems, queue management solutions, and digital signage platforms with integrated backend services.

JavaAndroidJavaScriptMySQLMS SQL Server

WordPress & E-commerce Solutions

Custom WordPress and WooCommerce development for diverse clients since 2014. Built responsive websites, e-commerce backends, and REST API integrations for small to medium-sized businesses.

PHPWordPressWooCommerceJavaScriptMySQL

03.

Experience

Backend Engineer - Acquiring Team

Mews

July 2025 - Present

Backend engineer working on payment infrastructure and financial services
Developing enterprise-scale backend systems
Building secure, reliable financial technology solutions

C#.NETCloud InfrastructureMicroservices

Backend Engineer - Payments Team

Mews

2022 - July 2025

Develop secure financial transaction systems and payment processing infrastructure
Built integrations with global payment gateways for seamless payment operations
Implemented scalable backend services for the hospitality and travel industry

C#.NETPayment APIsSQLCloud Services

.NET Developer

STK GDC SL (Softtek)

April 2020 - 2022

Maintained and enhanced fraud detection and compliance systems for UK-based fintech client
Made improvements to transaction monitoring engine allowing for processing up to 90k transactions a day
Managed application monitoring, alerting infrastructure, and CI/CD pipelines
Mentored junior developers through technical discussion and comprehensive code reviews

C#.NETAWSDockerPostgreSQLMSSQLJenkinsSplunk

Application Management Support

STK GDC SL (Softtek)

October 2019 - April 2020

Provided operations support for major Spanish multinational clothing company
Monitored system health, performance metrics, and service availability
Streamlined operational processes and implemented KPI reporting with automated alerts

Monitoring ToolsSQLOperations ManagementKPI Reporting

Tech Lead / Co-Founder

P-Dub Inc

December 2016 - September 2019

Co-founded and led technical direction for mobile development startup based in Seattle
Architected and developed cross-platform mobile applications for iOS and Android
Built gift recommendation platform with backend services and mobile client applications
Built prototype in iOS and Android to read utility bills with OCR to calculate savings for average households

JavaKotlinSwiftNode.jsAzureFirebaseMS SQL Server

Junior Java Developer

Zemsania - Everis SL

May 2016 - November 2019

Developed custom Java frameworks and applications for Galician Government agencies
Built healthcare integration services with HL7 messaging standards for public health systems
Implemented reporting solutions using Jasper Reports and Mirth Connect integration channels

JavaMirth ConnectHL7PostgreSQLMS SQL ServerJasper Reports

Web Developer

Freelance

January 2014 - Present

Providing PHP web development and WordPress solutions for diverse clients
Building custom WooCommerce backends and e-commerce solutions
Developing responsive web applications with modern JavaScript and CSS frameworks

PHPWordPressJavaScriptMySQLHTML/CSSjQueryREST APIs

Junior Java Developer

Plexus Technologies SL

December 2013 - November 2015

Developed enterprise software for healthcare organizations, government agencies, and private sector
Built interactive kiosk systems and queue management solutions using Java and Android
Created digital signage platforms with integrated backend services

JavaJavaScriptAndroidMySQLMS SQL ServerCSS

04.

Get In Touch

Let's Build Something Amazing Together

I'm always interested in hearing about new projects and opportunities. Whether you have a question or just want to say hi, feel free to reach out!