Lucas BuchallaSesti
Senior Mobile Developer
Flutter • Swift • Kotlin • Architecture • TDD • Design Systems
Based in Valencia, Spain • Building performant mobile apps for 20,000+ users
About Me
Performance-driven Senior Mobile Developer with 6+ years of experience in creating high-performing and scalable apps. Expertise in Flutter, Swift, Kotlin, and Angular with a focus on architecture, test-driven development, and design systems.
I specialize in building efficient, maintainable solutions that prioritize user experience and code quality. Passionate about mentoring junior developers and establishing best practices across teams.
Experience
Senior Mobile Developer
Lejour
- •Progressively promoted from intern to Senior Developer in 5 years by virtue of persistent technical brilliance
- •Flutter adoption champion: reduced codebase by 25% and builds by 60%
- •Scaled mobile apps to 20,000+ customers with 97% crash-free sessions
- •Established design system and component library: reduced development time by 40%
- •Led TDD initiatives and expanded test coverage from 20% to 80%+
- •Mentored 3 junior engineers; led one from intern to mid-level engineer
- •Maintained consistent commit conventions with Commitizen across 7+ developer team
- •Built internal dashboards with Angular using best practices and latest versions
- •Collaborated closely with product and UX teams on user-centered features
Mobile Developer
Mude Health
- •Established and maintained multi-platform mobile features for wellness experiences
- •Led white-label app development with customization for multiple brands
- •Maintained shared codebase across different brand deployments
- •Organized cohesive Flutter library to ease UI elements and asset reusability
- •Achieved consistency and code reusability through effective modularity
Skills
Mobile
Frontend
Backend
Database
Cloud & DevOps
Practices & Methodologies
Projects
Lejour App
Wedding planning platform supporting 20,000+ customers with high-performance, scalable mobile experience.
Key Highlights:
- 20,000+ customers with 97% crash-free sessions
- Established design system reducing development time by 40%
- Expanded test coverage from 20% to 80%+ with TDD
- Modular architecture for scalability
- Performance-optimized across iOS and Android
Mude Health
Multi-brand wellness application supporting rapid deployment across different health organizations while maintaining a shared codebase.
Key Highlights:
- Led white-label development for multiple brands
- Maintained shared codebase with brand customization
- Organized cohesive Flutter library for reusable components
- Achieved consistency through effective modularity
- Scalable feature delivery across deployments
Onboardly
Open-source Flutter package for building beautiful onboarding flows with spotlight effects and interactive tooltips. Zero external dependencies.
Key Highlights:
- Published on pub.dev with 160 pub points and 197 weekly downloads
- Spotlight effect for highlighting UI elements with customizable overlays
- Interactive tooltips with flexible positioning
- State management agnostic — works with any solution
- Cross-platform: Android, iOS, Linux, macOS, Windows
Languages & Certifications
Languages
Certifications
Basic 2 Arabic Certified
Centro da Língua Árabe
08/2023 - 11/2023
Chinese Certified
Fluency Academy
10/2021 - 08/2023
Get in Touch
I'm always interested in hearing about new projects and opportunities.