Francisco Sierra

Delivered Android features for multiple client projects including BAZ Negocio, Bradescard, Realtor.com, and an entertainment AI initiative. Refactored QR payment flows, built Compose-based installment flows, and modernized legacy screens.

Worked on Wallet features for balances, transaction details, payment methods, and transfer flows in a global fintech app. Rebuilt Wallet UI sections and integrated payment-method validation with a third-party compliance provider.

Owned large parts of Kanto's Android app, leading feature development, maintenance, Play Store releases, and production support. Led Kanto Score, an interactive karaoke scoring feature, and improved video upload reliability with Cloudinary chunked uploads.

Improved a Java Android app for gas delivery operations, stabilizing Bluetooth communication with proprietary hardware and supporting GitLab CI/CD workflows.

Modernized CineQC/Cine Control, an enterprise tablet app for cinema operations using NFC-based location scanning, checklists, local persistence, and local API control. Stabilized a legacy MVP codebase into a Jetpack-based app.

Built and maintained internal Android apps used by field employees for operational workflows and socioeconomic visit data collection.

Grade: C1 Advanced, 64/100

Earned an EF SET English Certificate at the C1 Advanced level with a score of 64/100.

Pursued a degree in Software Development Engineering, focusing on software engineering principles and practices.