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Hi Twine team, I was excited to see your need for a Flutter specialist to refine a fintech app in its final pre-launch phase—this is exactly the high-impact, detail-oriented work I thrive on. My 8+ years as a Senior Software Engineer include optimizing and shipping multiple Flutter apps from concept to production, with a recent focus on fintech platforms like UnDosTres, where I led a hybrid-to-Flutter migration that boosted performance by 60% and slashed customer support tickets by 65% by tackling UI bugs and flow issues. Your deliverables align perfectly with my hands-on experience: - UI Consistency & Onboarding: I’ve implemented reusable component libraries and A/B tested onboarding flows (using Firebase/RevenueCat) to increase retention by 25%. - Debugging & API Integration: I’ve resolved complex state management and API troubleshooting in payment apps, ensuring stable data flow. - Performance & Launch Prep: I regularly optimize Flutter apps for smooth operation across devices—reducing response times by 30% in one project—and prepare apps for production with comprehensive testing and CI/CD. I’m passionate about clean execution and can start immediately, working autonomously to meet tight deadlines. My AI-assisted development workflow (Claude Code, Cursor) also accelerates bug fixes and refinements without sacrificing quality.…Hi Twine team, I was excited to see your need for a Flutter specialist to refine a fintech app in its final pre-launch phase—this is exactly the high-impact, detail-oriented work I thrive on. My 8+ years as a Senior Software Engineer include optimizing and shipping multiple Flutter apps from concept to production, with a recent focus on fintech platforms like UnDosTres, where I led a hybrid-to-Flutter migration that boosted performance by 60% and slashed customer support tickets by 65% by tackling UI bugs and flow issues. Your deliverables align perfectly with my hands-on experience: - UI Consistency & Onboarding: I’ve implemented reusable component libraries and A/B tested onboarding flows (using Firebase/RevenueCat) to increase retention by 25%. - Debugging & API Integration: I’ve resolved complex state management and API troubleshooting in payment apps, ensuring stable data flow. - Performance & Launch Prep: I regularly optimize Flutter apps for smooth operation across devices—reducing response times by 30% in one project—and prepare apps for production with comprehensive testing and CI/CD. I’m passionate about clean execution and can start immediately, working autonomously to meet tight deadlines. My AI-assisted development workflow (Claude Code, Cursor) also accelerates bug fixes and refinements without sacrificing quality.

Damian Diaz

Programmer, App Developer, Full Stack Developer, +3

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Hi Twine team, I was excited to see your need for a Flutter specialist to refine a fintech app in its final pre-launch phase—this is exactly the high-impact, detail-oriented work I thrive on. My 8+ years as a Senior Software Engineer include optimizing and shipping multiple Flutter apps from concept to production, with a recent focus on fintech platforms like UnDosTres, where I led a hybrid-to-Flutter migration that boosted performance by 60% and slashed customer support tickets by 65% by tackling UI bugs and flow issues. Your deliverables align perfectly with my hands-on experience: - UI Consistency & Onboarding: I’ve implemented reusable component libraries and A/B tested onboarding flows (using Firebase/RevenueCat) to increase retention by 25%. - Debugging & API Integration: I’ve resolved complex state management and API troubleshooting in payment apps, ensuring stable data flow. - Performance & Launch Prep: I regularly optimize Flutter apps for smooth operation across devices—reducing response times by 30% in one project—and prepare apps for production with comprehensive testing and CI/CD. I’m passionate about clean execution and can start immediately, working autonomously to meet tight deadlines. My AI-assisted development workflow (Claude Code, Cursor) also accelerates bug fixes and refinements without sacrificing quality.…Hi Twine team, I was excited to see your need for a Flutter specialist to refine a fintech app in its final pre-launch phase—this is exactly the high-impact, detail-oriented work I thrive on. My 8+ years as a Senior Software Engineer include optimizing and shipping multiple Flutter apps from concept to production, with a recent focus on fintech platforms like UnDosTres, where I led a hybrid-to-Flutter migration that boosted performance by 60% and slashed customer support tickets by 65% by tackling UI bugs and flow issues. Your deliverables align perfectly with my hands-on experience: - UI Consistency & Onboarding: I’ve implemented reusable component libraries and A/B tested onboarding flows (using Firebase/RevenueCat) to increase retention by 25%. - Debugging & API Integration: I’ve resolved complex state management and API troubleshooting in payment apps, ensuring stable data flow. - Performance & Launch Prep: I regularly optimize Flutter apps for smooth operation across devices—reducing response times by 30% in one project—and prepare apps for production with comprehensive testing and CI/CD. I’m passionate about clean execution and can start immediately, working autonomously to meet tight deadlines. My AI-assisted development workflow (Claude Code, Cursor) also accelerates bug fixes and refinements without sacrificing quality.

Available to hire

Madrid, Spain

Hi Twine team,

I was excited to see your need for a Flutter specialist to refine a fintech app in its final pre-launch phase—this is exactly the high-impact, detail-oriented work I thrive on. My 8+ years as a Senior Software Engineer include optimizing and shipping multiple Flutter apps from concept to production, with a recent focus on fintech platforms like UnDosTres, where I led a hybrid-to-Flutter migration that boosted performance by 60% and slashed customer support tickets by 65% by tackling UI bugs and flow issues.

Your deliverables align perfectly with my hands-on experience:

UI Consistency & Onboarding: I’ve implemented reusable component libraries and A/B tested onboarding flows (using Firebase/RevenueCat) to increase retention by 25%.
Debugging & API Integration: I’ve resolved complex state management and API troubleshooting in payment apps, ensuring stable data flow.
Performance & Launch Prep: I regularly optimize Flutter apps for smooth operation across devices—reducing response times by 30% in one project—and prepare apps for production with comprehensive testing and CI/CD.

I’m passionate about clean execution and can start immediately, working autonomously to meet tight deadlines. My AI-assisted development workflow (Claude Code, Cursor) also accelerates bug fixes and refinements without sacrificing quality.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Spanish; Castilian

Fluent

Work Experience

Senior Flutter Developer at Ruvik Group

July 1, 2024 - Present

Increased application response speed by 30% through efficient state management and performance optimization. Built, optimized and deployed two Flutter applications across iOS and Android platforms. Improved user retention by integrating new UI/UX features and contributed to a more robust app architecture.

Senior Flutter Developer at Nuvo Energy

June 1, 2023 - Present

Enhanced database performance by leveraging AWS resources to optimize PostgreSQL queries, resulting in a remarkable tenfold improvement in query speed. Implemented triggers, functions, and cron jobs for automated data processing, leading to significant efficiency gains. Drove architecture and feature development for a versatile mobile application offering a wide range of payment and service options, including cinema ticket booking and mobile recharges.

Senior Flutter Developer at Edu Cup

January 1, 2023 - Present

Spearheaded productivity improvements by implementing features for a versatile mobile application offering a wide range of payment and service options. Demonstrated expertise in engineering and developing features for cross-platform mobile apps, driving faster delivery and improved user experiences.

Senior Full Stack Developer at Imagined Earth

May 1, 2022 - Present

Led compelling presentations to executives and stakeholders, increasing buy-in by 20% and improving project approvals by 15%. Executed the successful launch of a cutting-edge Flutter mobile app, attracting an average of 36 new users daily and increasing user retention by 42%, contributing to 20% annual business growth. Architected a reusable component set and transitioned to a more robust MVC architecture using Node.js, Express, and AWS for scalability and maintainability.

Full Stack Developer at Flexport

November 1, 2020 - April 30, 2022

Led the seamless migration of a monorepo legacy system to the AWS cloud, delivering 60% annual cost savings. Conducted comprehensive re-engineering across platforms (Angular web app, Django backend, Flutter mobile app), improving performance and contributing to 20% annual user growth.

Senior Flutter Developer at Undostres

July 20, 2023 - June 20, 2024

Architected migration to MVC architecture using Node.js, Express, and Apollo Server on AWS; improved stability, scalability, and maintainability; collaborated with distributed teams across multiple projects; achieved ~60% performance gains and streamlined maintenance.

Senior Software Engineer at EduCup

January 20, 2023 - June 20, 2023

Designed content creation workflows in Flutter, driving a 20% revenue boost and 30% operational efficiency gains; engineered reusable components and code modules, accelerating development velocity.