Senior Android Engineer
Saul Cintero
I design and modernize mobile platforms using Kotlin, focusing on architecture, reliability and delivery systems. 14+ years building and evolving production mobile applications across finance, retail, media and public sector.
About me
I'm a Senior Android Engineer specializing in Kotlin and modern Android architecture.
My work focuses on building scalable mobile platforms and improving long-term maintainability through clean architecture, reliable delivery processes and pragmatic engineering practices.
Throughout my career I have worked both on greenfield projects and on modernizing existing mobile applications, helping teams adopt current Android standards, improve production stability and ship features more efficiently.
Beyond coding, I enjoy collaborating across teams — mobile, backend and product — to turn complex requirements into stable and maintainable systems.
More recently, I’ve been working with Kotlin Multiplatform to apply the same architectural principles across Android, iOS and other platforms.
Work experience
Mobile & DevOps Engineer
Hiberus - Spain & Argentina
2021 - Present
Delivering Android solutions across finance, public sector, media, retail and entertainment, supporting applications with 100K+ users.
• Modernized legacy Android applications by introducing dependency injection, ViewModels and modern navigation patterns.
• Implemented Adyen payment integration on Android POS terminals operating in kiosk mode.
• Designed and implemented new CI/CD pipelines (GitHub Actions → GitLab CI + Fastlane on Docker), reducing deployment time by 55%.
• Improved production stability by eliminating recurring crashes and resolving complex device-specific issues.
Software Engineer
ALCAD Electronics - Irun, Spain
2020 - 2021
Worked on projects combining AI-based video analytics systems and web platform modernization.
• Developed a high-performance C++ daemon for real-time person detection on embedded hardware (Intel NUC), processing video streams from 20+ IP cameras per node under strict memory constraints.
• Modernized an internal management platform by migrating it from ActionScript3 to TypeScript, redesigning the interface using Material Design principles.
CTO & Co-Founder
Kinendu - Irun, Spain
2017 - 2023
Co-founded a technology startup and led the technical strategy, designing the system architecture and delivering the first product from concept to production.
• Designed the system architecture, including REST APIs, database model and backend services.
• Led cross-platform development across Android, iOS and Web, ensuring consistent product delivery.
• Managed AWS infrastructure, deployments and operational costs.
• Represented the technical vision in discussions with investors and stakeholders.
Software Developer & Network Administrator
TransNatur Norte - Irun, Spain
2002 - 2019
Developed internal systems for a large logistics company while managing enterprise IT infrastructure supporting daily operations.
• Built native Android (Java) and iOS (Objective-C) applications for real-time logistics tracking and proof-of-delivery.
• Developed backend integrations and third-party API connections to automate logistics workflows and reduce operational errors.
• Administered IT infrastructure for 500+ employees, improving system security, uptime and data reliability.
Featured Projects
Explore some of my recent work and creative solutions.
MeteoMate:
Weather forecast with AI-powered outfit suggestions
Description:
Weather application combining multiple forecast sources with AI-powered outfit recommendations.
Role:
The project was developed end-to-end, including architecture, design, testing and Play Store deployment.
Skills
Core technical areas that shape the mobile platforms and systems I build
Kotlin & Android
Building production Android apps using modern Android tooling and Jetpack libraries.
Mobile Architecture
Designing scalable, maintainable architectures for long-term product evolution.
CI/CD & Delivery Systems
Automating build, testing and release pipelines for reliable deployments.
Platform Modernization
Refactoring legacy applications to modern Android standards.
Kotlin Multiplatform
Sharing business logic across Android, iOS and other platforms using KMP.
Performance & Reliability
Improving production stability through debugging, profiling and architectural improvements.
Get in touch
Send me a message and I'll follow up as soon as posible. Let's talk!