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Senior mobile engineer with 8+ years of experience and 6+ years shipping Flutter in production across iOS, Android, and web. Specialized in hybrid-to-Flutter migrations (one delivered a measured ~60% performance improvement), modular mobile architecture, and full-stack delivery with Supabase, Stripe, AWS, and Node.js. Currently building Flutter + Supabase + Stripe products as a senior IC. Domain experience spans fintech (UnDosTres consumer payments at scale), telco / e-SIM (AsiaFlare), IoT (Imagined Earth), and EdTech. Comfortable owning features end-to-end, from architecture and data modeling through release, monitoring, and post-launch iteration. AI-first developer: Claude Code and Cursor as daily tools, not as add-ons. Workflow: write detailed Markdown specs first, then drive AI agents through them with tight iteration loops. Useful for multi-file refactors, migrations, and rapid prototyping at senior quality bars. Logistics: based in Madrid, Spain, on a digital nomad visa. B2B contractor with non-Spanish entities (EU non-Spain, UK, US, LATAM). Fully remote, occasional travel OK. Looking for: senior Flutter or full-stack engagements (Flutter, Supabase, Stripe, Node.js, AWS / GCP) where mobile is strategic, ownership is real, and the team values modern engineering practices including AI-assisted delivery.…Senior mobile engineer with 8+ years of experience and 6+ years shipping Flutter in production across iOS, Android, and web. Specialized in hybrid-to-Flutter migrations (one delivered a measured ~60% performance improvement), modular mobile architecture, and full-stack delivery with Supabase, Stripe, AWS, and Node.js. Currently building Flutter + Supabase + Stripe products as a senior IC. Domain experience spans fintech (UnDosTres consumer payments at scale), telco / e-SIM (AsiaFlare), IoT (Imagined Earth), and EdTech. Comfortable owning features end-to-end, from architecture and data modeling through release, monitoring, and post-launch iteration. AI-first developer: Claude Code and Cursor as daily tools, not as add-ons. Workflow: write detailed Markdown specs first, then drive AI agents through them with tight iteration loops. Useful for multi-file refactors, migrations, and rapid prototyping at senior quality bars. Logistics: based in Madrid, Spain, on a digital nomad visa. B2B contractor with non-Spanish entities (EU non-Spain, UK, US, LATAM). Fully remote, occasional travel OK. Looking for: senior Flutter or full-stack engagements (Flutter, Supabase, Stripe, Node.js, AWS / GCP) where mobile is strategic, ownership is real, and the team values modern engineering practices including AI-assisted delivery.

Damian Diaz

Programmer, App Developer, Full Stack Developer, +3

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Senior mobile engineer with 8+ years of experience and 6+ years shipping Flutter in production across iOS, Android, and web. Specialized in hybrid-to-Flutter migrations (one delivered a measured ~60% performance improvement), modular mobile architecture, and full-stack delivery with Supabase, Stripe, AWS, and Node.js. Currently building Flutter + Supabase + Stripe products as a senior IC. Domain experience spans fintech (UnDosTres consumer payments at scale), telco / e-SIM (AsiaFlare), IoT (Imagined Earth), and EdTech. Comfortable owning features end-to-end, from architecture and data modeling through release, monitoring, and post-launch iteration. AI-first developer: Claude Code and Cursor as daily tools, not as add-ons. Workflow: write detailed Markdown specs first, then drive AI agents through them with tight iteration loops. Useful for multi-file refactors, migrations, and rapid prototyping at senior quality bars. Logistics: based in Madrid, Spain, on a digital nomad visa. B2B contractor with non-Spanish entities (EU non-Spain, UK, US, LATAM). Fully remote, occasional travel OK. Looking for: senior Flutter or full-stack engagements (Flutter, Supabase, Stripe, Node.js, AWS / GCP) where mobile is strategic, ownership is real, and the team values modern engineering practices including AI-assisted delivery.…Senior mobile engineer with 8+ years of experience and 6+ years shipping Flutter in production across iOS, Android, and web. Specialized in hybrid-to-Flutter migrations (one delivered a measured ~60% performance improvement), modular mobile architecture, and full-stack delivery with Supabase, Stripe, AWS, and Node.js. Currently building Flutter + Supabase + Stripe products as a senior IC. Domain experience spans fintech (UnDosTres consumer payments at scale), telco / e-SIM (AsiaFlare), IoT (Imagined Earth), and EdTech. Comfortable owning features end-to-end, from architecture and data modeling through release, monitoring, and post-launch iteration. AI-first developer: Claude Code and Cursor as daily tools, not as add-ons. Workflow: write detailed Markdown specs first, then drive AI agents through them with tight iteration loops. Useful for multi-file refactors, migrations, and rapid prototyping at senior quality bars. Logistics: based in Madrid, Spain, on a digital nomad visa. B2B contractor with non-Spanish entities (EU non-Spain, UK, US, LATAM). Fully remote, occasional travel OK. Looking for: senior Flutter or full-stack engagements (Flutter, Supabase, Stripe, Node.js, AWS / GCP) where mobile is strategic, ownership is real, and the team values modern engineering practices including AI-assisted delivery.

Available to hire

Senior mobile engineer with 8+ years of experience and 6+ years shipping Flutter in production across iOS, Android, and web. Specialized in hybrid-to-Flutter migrations (one delivered a measured ~60% performance improvement), modular mobile architecture, and full-stack delivery with Supabase, Stripe, AWS, and Node.js. Currently building Flutter + Supabase + Stripe products as a senior IC.

Domain experience spans fintech (UnDosTres consumer payments at scale), telco / e-SIM (AsiaFlare), IoT (Imagined Earth), and EdTech. Comfortable owning features end-to-end, from architecture and data modeling through release, monitoring, and post-launch iteration.

AI-first developer: Claude Code and Cursor as daily tools, not as add-ons. Workflow: write detailed Markdown specs first, then drive AI agents through them with tight iteration loops. Useful for multi-file refactors, migrations, and rapid prototyping at senior quality bars.

Logistics: based in Madrid, Spain, on a digital nomad visa. B2B contractor with non-Spanish entities (EU non-Spain, UK, US, LATAM). Fully remote, occasional travel OK.

Looking for: senior Flutter or full-stack engagements (Flutter, Supabase, Stripe, Node.js, AWS / GCP) where mobile is strategic, ownership is real, and the team values modern engineering practices including AI-assisted delivery.

Skills

Experience Level

Expert

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Intermediate

Intermediate

Intermediate

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.

Senior Flutter Developer at Undostres

July 20, 2024 - Present

Led Flutter development and end-to-end features across iOS, Android, and web; implemented real-time chat, push notifications, analytics, and custom animations. Delivered multiple Flutter apps and optimized performance.

Flutter Developer at Flexport

November 1, 2020 - April 1, 2022

Launched a Flutter mobile app that acquired ~40 new users daily, lifting retention by 42% and contributing to 20% annual business growth. Migrated and optimized cross-platform delivery of features.