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marcOS 1.0 - based on original macOS System 1

Boot complete - Antofagasta, Chile - Remote

Marcos Dávalos

Senior Mobile Developer focused on payments, POS and mission-critical mobile products

Software Engineer with 10+ years building Android/iOS apps, payment systems and POS solutions on PAX devices. I work with Kotlin, Swift, financial SDKs, Bluetooth, App2App, C2C/H2H, EMV/FIME, backend services, Firebase, AWS and CI/CD.

AndroidiOSKotlinSwiftPOS/PAXEMV/FIME

Contact View experience Request resume

10+years of experience

Android/iOSnative mobile development

PAXA920, A920PRO, IM30, A8500, A50, A35

EMV/FIMEpayment flows and certifications

Profile

I focus on mobile products where stability, maintainability and external-service integration really matter. My work spans critical payment flows, legacy modernization, certifications, POS hardware support and personal products with real users.

Professional experience

Transformapp

Android and iOS Developer

Santiago, Chile - Remote

January 2021 - Present

Built native Android/Kotlin and iOS/Swift apps for Transbank MPOS and Android POS solutions.
Integrated Bluetooth communication, provider SDKs and critical payment flows.
Contributed to FIME/Mastercard certifications and functional initiatives focused on compliance and operational stability.
Modernized legacy code through Java-to-Kotlin migration, XML refactoring and performance improvements.
Supported PAX A920, A920PRO, IM30, A8500, A50 and A35 devices across Integrated POS, C2C and App2App modes.

Devoción Matutina App

Full Stack Developer - Personal product

Antofagasta, Chile

March 2013 - Present

Active Android and iOS app for daily readings, dynamic content and cross-platform end-user experience.
Native Android/Kotlin and iOS/Swift development, evolving toward shared architecture and multiplatform components.
Implemented authentication, profiles, favorites, Realtime Database, Firestore, Storage and push notifications.
Created an Angular admin dashboard for content, authors, programs and resources.
Integrated OpenAI to generate audio from devotional text, alongside APIs and content synchronization work.

FabLab Atacama

Technology Tutor

Antofagasta, Chile

July 2014 - August 2017

Supported talks, workshops and new-technology activities at FabLab Atacama, an initiative connected to Antofagasta International School.

Projects

Personal product

Devoción Matutina

Active Android and iOS app with daily readings, dynamic content, authentication, favorites, notifications and an admin dashboard.

KotlinSwiftFirebaseAngularOpenAI

Realtime service

Radio Streaming

Streaming service with realtime chat.

StreamingRealtimeChat

Native iOS

Agenda

Native iOS app for Adventist school students across South America.

iOSSwiftEducation

Hybrid app

Seifrei

Application for laundry order management.

HybridOrdersOperations

Operations

Manufacturing

Odoo-based application for manufacturing management and tracking.

OdooManufacturingWorkflow

Skills

Mobile

AndroidKotlinJavaiOSSwiftXMLMVVMMVCClean Code

POS and payments

PAXMPOSIntegrated POSApp2AppC2CH2HEMV/FIMEFinancial SDKs

Communication

BluetoothSerialRESTWebSocketsMQTT

Backend and cloud

FirebaseAWS LambdaAPI GatewayS3DjangoLaravel

Data

FirestoreRealtime DatabaseSQLitePostgreSQLMySQLDynamoDB

Web and DevOps

AngularReactDockerJenkinsGitHub Actions

Education and certifications

Software Engineering - Universidad Tecnológica de Chile (INACAP), 2019

Android Kotlin Developer Nanodegree - Udacity, 2021

Android Architect - Dev Experto, 2024

PCI Training - Inside Security, 2025

Resume

If you would like to review my background in detail, please request my resume directly at im@marcosdavalos.dev. I will be glad to share it for professional opportunities, technical collaborations or product conversations.

About This marcOS

marcOS 1.0 was built as a fast, bilingual, responsive professional profile prepared for Cloudflare, with an interface based on original macOS/System 1.

AstroTypeScriptTailwind CSSCloudflare Workers Static AssetsCloudflare WranglerCloudflare Web AnalyticsSEO metadataSitemapJSON-LDOpenGraph

Open channel

Contact

If you want to talk about mobile development, POS integration, payment products or technical collaboration, you can reach me directly.

im@marcosdavalos.dev LinkedIn