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Carlos Ortiz

@carlosortiz1

Senior Android Engineer at Elektra USA who modernized a remittance app, migrated 70% of legacy UI to Compose, and cut load time by up to 1.5 seconds.

Mexico

Message

What I'm looking for

I’m available immediately for remote contract, full-time, or part-time work, with US-hours overlap. I’ve spent the last 1.5 years working as an independent full-time contractor for US-based clients.

At Elektra USA, I modernized a cross-border remittance app by migrating legacy UI flows to Jetpack Compose and Navigation Compose. I cut app load time by 1–1.5 seconds and rebuilt the transaction core, starting without documentation.

At Palo IT, on the Femsa client project, I built a card payment acceptance app that integrated physical mPOS hardware. I owned the charge flow from device connection through transaction and PDF ticket generation, and led a Kotlin Multiplatform core that reduced development time on shared logic by about 40%.

At Invex, I led a full rewrite of an internal app in Kotlin and Jetpack, running it alongside the production version to avoid a maintenance freeze. Earlier, I built an internal credit card delivery app used by 100+ operators and implemented biometric authentication to help prevent identity fraud.

I also shipped Mi Cumple, a Roblox game I designed and built solo, and created a native macOS menu bar app that sends code screenshots to an LLM for live feedback. I’m comfortable taking a feature from discovery through release and production follow-up.

Experience

Work history, roles, and key accomplishments

Senior Android Developer

Elektra USA

Jul 2024 - Jan 2026 (1 year 6 months)

Modernized a cross-border remittance app by migrating legacy UI flows to Jetpack Compose and Navigation Compose. Cut app load time by 1–1.5 seconds through dependency cleanup and restructured dependency injection.

Kotlin Jetpack Compose Compose Navigation Hilt MVVM Clean Architecture Coroutines Flow Android Studio Gemini

Android Developer

Palo IT

Aug 2022 - Dec 2023 (1 year 4 months)

Built a card payment acceptance app for debit and credit cards, integrating physical mPOS hardware. Led the Kotlin Multiplatform core sharing networking, request building, transaction rules, and device state.

Kotlin Kotlin Multiplatform Ktor Kotlinx Serialization Koin Jetpack Compose Navigation StateFlow GraphQL Cocoapods MPOS Software

Android Developer

Covalto

Mar 2022 - Jul 2022 (4 months)

Worked on the credit application flow where entrepreneurs signed documents and attached supporting files. Delivered the documentation attachment flow with PDF and PNG uploads with file-size limits.

Kotlin MVVM MVI (Uniflow)Junit MockK Robolectric REST

Android Lead

Invex

May 2021 - Feb 2022 (9 months)

Led the full rewrite of the internal app into a new Kotlin, MVVM, and Jetpack project. Ran the rewrite in parallel with the production version to avoid a maintenance freeze.

Kotlin MVVM ROOM Navigation LiveData Android Jetpack Code Review Standards

Android Developer

Invex

Aug 2018 - May 2021 (2 years 9 months)

Built an internal credit card delivery app used by 100+ operators nationwide. Implemented biometric authentication to confirm the card was handed to the right person and prevent identity fraud.

Java Kotlin MVP SQLite SharedPreferences Fingerprint API Material Design

Mobile Developer

iGenter

Sep 2015 - Apr 2018 (2 years 7 months)

Built an internal employee app with check-in/check-out, vacation requests, schedules, and payslips. Delivered a two-platform job board app in Android and iOS for candidates to browse and apply to open roles.

Android Java iOS SQLite Volley Google Maps API FacebookSDK