Implementación Ley Antifraude (Ley 11/2021 + RD 1007/2023) en app Flutter + Firebase

@OutsourceMan

⭐⭐⭐⭐⭐ Estimado/a, CnELIndia junto con Raman Ladhani puede ayudarle a implementar la Ley Antifraude en su app Flutter + Firebase asegurando cumplimiento técnico y legal en cada hito. Primero, configuraremos entornos seguros con Firestore Rules, Secret Manager y almacenamiento WORM, validando inmutabilidad de campos críticos y evidencia de retención. Luego, desarrollaremos la cadena de hashes (hashPrev, hashAct, partialHash) e integraremos Invopop en Cloud Functions con validación contra schemas, firma, QR y PDF canónico, todo bajo idempotencia estricta. Posteriormente, construiremos pruebas unitarias y e2e para asegurar reproducibilidad de hashes, cierre Merkle diario firmado y exportaciones AEAT descargables. Finalmente, generaremos el reporte de evidencias para la Declaración Responsable, incluyendo logs inalterables y pruebas deterministas. Nuestra experiencia previa en integraciones con TicketBAI, VeriFactu y sistemas WORM garantiza un enfoque robusto frente a riesgos de concurrencia, errores de proveedor y limitaciones de Firestore.

@idefcoinfotech

I have a few questions based on the shared description: 1) Which compliance mode is the immediate priority for you: VeriFactu, TicketBAI, or both? 2) For the WORM storage, do you already have the retention policy configured in GCS, or should I set up and validate the lock? 3) Should the first milestone focus on hash chain + Invopop integration, or on immutability/WORM setup? I have hands-on experience with Firestore + Cloud Functions v2 and antifraud invoicing projects (TicketBAI/VeriFactu), including chained hashes, digital signatures, and WORM storage with legal retention. I’ve delivered production-ready integrations with external providers (Invopop, AEAT) ensuring regulatory compliance. With 8+ years building critical solutions on Firebase, Node.js, and Flutter, I apply strict idempotency, deterministic testing, and immutable audit logging. If you could open the chat window to continue the conversation, that would be great for me. Warm regards Idefco Before we discuss the project, please note that the price is a placeholder only.

@Rekhathakur

Hello, With a solid foundation in mobile and web application development, I am skilled in all the key areas needed to make your 'Ley Antifraude' project a success. I have extensive experience working with Flutter, Firebase, Cloud Functions (Node 20), Firestore, Storage, and more -- all integral components for your implementation. My proficiency in maintaining Firestore data, implementing secure storage systems like the WORM mechanism you require and generating immutable PDFs with QR codes will ensure that you adhere to the law's requirements while protecting the integrity of your financial data. I have not only completed similar projects involving certified digital signatures, QR codes and WORM storage but also have familiarity with Invopop services for authentication/signing purposes. Additionally, my understanding of tax regulatory frameworks enables me to comprehend the AEAT's access requirement. Our overlapping goals of innovation & profitability align well with what you're hoping to achieve. Addressing concerns around future-compatibility (TBAI/VF) is something I specialize in. As far as concurrency-driven glitches & large XMLs on Firestore are concerned, I have experience designing against them forbidding any operational turbulence. Trust WellSpring Infotech for enhancing your app using scalable and quality-focused strategies! Thank you

@divumanocha

Hello, I am really excited about the opportunity to collaborate with you on this project! It aligns perfectly with my skill set and experience, and I’m confident I can contribute meaningfully to your vision. I genuinely enjoy working on projects like this, and I believe we can create something both functional and visually engaging. Please feel free to check out my profile to learn more about my past work and client feedback. I’d love to connect and discuss the project details further your goals, expectations, and any specific features or ideas you have in mind. The more I understand your vision, the better I can bring it to life. I am ready to get started right away and will put my full energy and focus into delivering quality results on time. My goal is not just to complete the project, but to exceed your expectations and build a long-term working relationship. Looking forward to hearing from you soon! With regards! Divya

@ixorawebmob

Hola Omar, Entiendo perfectamente la importancia de implementar la Ley Antifraude en tu aplicación Flutter con Firebase. Este tipo de proyecto requiere atención detallada y experiencia en Firestore y Cloud Functions, y estoy aquí para ayudarte a lograrlo con éxito. Ofrezco: - **Desarrollo de apps multiplataforma** utilizando Flutter. - **Backend scalable** con Firebase y Node.js, asegurando un almacenamiento WORM adecuado. - **Interfaz limpia y moderna** con múltiples revisiones para ajustarnos a tus expectativas. - **6 meses de soporte gratuito** post-lanzamiento, asegurando que todo funcione correctamente. Te invito a revisar algunos de mis trabajos anteriores: 1. Aplicación de Entrega de Comida. 2. Aplicación de Reserva de Taxis. 3. Aplicación de Citas. Aquí está el enlace a mi portfolio: (https://www.freelancer.in/u/ixorawebmob) **Cronograma estimado:** - Diseño de UI/UX: 4–5 días - Desarrollo: 14–18 días - Pruebas y Lanzamiento: 3–4 días Me encantaría conectar contigo para discutir más a fondo y responder cualquier duda que tengas sobre el proyecto. Gracias, Arpit

@abhisaini0188

Hello, Thank you so much for posting this opportunity it sounds like a great fit, and I’d love to be part of it! I’ve worked on similar projects before, and I’m confident I can bring real value to your project. I’m passionate about what I do and always aim to deliver work that’s not only high-quality but also makes things easier and smoother for my clients. Feel free to take a quick look at my profile to see some of the work I’ve done in the past. If it feels like a good match, I’d be happy to chat further about your project and how I can help bring it to life. I’m available to get started right away and will give this project my full attention from day one. Let’s connect and see how we can make this a success together! Looking forward to hearing from you soon. With Regards! Abhishek Saini

@Friends4it

Hola Omar, Entiendo que buscas implementar la Ley Antifraude en tu PWA con Flutter y Firebase, garantizando el cumplimiento riguroso en almacenamiento y firmas. - Experiencia en Firestore y Cloud Functions, con proyectos anteriores en firmas digitales y almacenamiento WORM. - Implementación de pruebas deterministas para asegurar la inmutabilidad y el funcionamiento del sistema bajo la Ley. - Atención meticulosa a la integración de Invopop y la generación de PDF canónicos. - Estrategias de mitigación para idempotencia y gestión de errores. Estoy listo para llevar este proyecto a la producción con efectividad. Me encantaría discutir más sobre esto. ¿Podrías detallar más sobre las herramientas actuales y el entorno en el que se desarrolla la PWA? Gracias, Muhammad

@HAZIQ87

My expertise in Flutter and Firebase development, honed over years building robust, compliant applications, makes me ideal for your project. A recent project involved integrating similar anti-fraud regulations (PSD2) into a Flutter app using Firebase Authentication, Firestore, and Cloud Functions (Node.js 16). This ensured seamless compliance and secure data handling. My approach will involve a phased implementation, starting with a thorough audit of your existing application's architecture to identify integration points. I'll leverage Firebase's robust security rules and Cloud Functions (Node.js 20) to implement the necessary validation and reporting mechanisms, adhering strictly to Ley 11/2021 and RD 1007/2023 guidelines. Testing will be rigorous, using unit and integration tests to guarantee compliance and application stability. Let's discuss this further—I'm confident I can deliver a compliant, efficient solution. Could you share specifics on your existing data models and user authentication flow to ensure a smooth and seamless integration?

@jmvdesignsohio

Hello, I'm a developer specializing in Firebase (Auth, Firestore, Storage, Cloud Functions v2) and Flutter, with experience in legal and tax compliance projects (TicketBAI, VeriFactu, digital signature, WORM storage, and generation of canonical PDFs with QR codes). For your PWA, I'll implement the entire anti-fraud checklist: immutable fields, chained hashes, integration with Invopop (/sign, /sign-and-send), secure storage in a WORM bucket with 10-year retention, generation of canonical PDFs with QR codes/§5bis legends, and daily Merkle-root signing. In a previous project, I integrated digital signatures and invoice traceability with hashPrev/hashAct, verifiable PDFs with QR codes, and immutable storage, achieving official validation with fixtures and e2e testing. I'll replicate that approach here, ensuring idempotence, concurrency control, and immutable logs in accordance with Law 11/2021 and Royal Decree 1007/2023. I'll deliver clear milestones with deterministic tests, documentation, fixtures, and evidence reporting for the Responsible Declaration. Best, Joseph

@mobiwebsolutions

¡Hola! He estudiado su proyecto completo sobre la implementación de la Ley Antifraude en Flutter + Firebase y comprendo plenamente los requisitos legales críticos y la complejidad del hashing, WORM, el acceso AEAT y el cumplimiento de extremo a extremo. Soy el candidato ideal para este proyecto porque he implementado sistemas antifraude similares con QR, firmas digitales y Firestore en aplicaciones financieras. 1. Experiencia real en Firestore, Cloud Functions (Node.js) y cumplimiento de bloqueo WORM. 2. Manejo de hash encadenado, PDF canónico, firmas Invopop y validación QR. 3. Control total de idempotencia, Merkle-root y pruebas deterministas. Me encargaré de la configuración del diseño, las reglas de Firestore, la lógica del backend, las pruebas (unitarias y e2e) y proporcionaré el código fuente completo y los hash fixtures con documentación. Tengo más de 9 años de experiencia como desarrollador full stack y más de 4 años en Flutter + Firebase, con proyectos firmados legalmente en sectores como fintech y antifraude de tickets. Proyectos similares: API antifraude para TBAI + PDF QR/Hash, sistemas WORM con exportación AEAT. Espero poder hablar contigo para cerrar un trato. Saludos cordiales. ¡Elisha Mariam!

@rbtech1984

Hola!!! ⭐⭐⭐⭐( Implementación Ley Antifraude en Flutter + Firebase )⭐⭐⭐⭐ Tu proyecto es claro y desafiante: implementar todo el cumplimiento de la Ley 11/2021 y RD 1007/2023 sobre tu app Flutter + backend Firebase. Ya tener la especificación técnica es un gran punto de partida — y me entusiasma trabajar con un entorno moderno y bien estructurado como este. Mi enfoque: desarrollo paso a paso según los hitos que propones, comenzando por campos inmutables y WORM, hasta cerrar con Merkle-root, exportaciones legales y pruebas deterministas. Uso funciones en Node.js (Cloud Functions v2) con total control sobre idempotencia, firmas, hashes encadenados y validaciones. Puntos clave: * Firebase Functions (Node 20) con reglas estrictas de idempotencia y seguridad * Integración robusta con Invopop (sign y sign-and-send) * Hashes encadenados, Merkle daily root y export legal verificable * Bucket WORM con lock comprobable * PDF canónico con QR exacto y leyenda legal Con 9+ años de experiencia y amplio recorrido en proyectos fiscales (TicketBAI, VeriFactu), garantizo código claro, bien probado, y documentación completa para la Declaración Responsable. ¿Te parece si empezamos revisando juntos el primer PR técnico? Best Regards, Farhin B.

@devbaloni1983

Hello, I am an expert with 15+ years of experience in the technical world, delivering simple to complex websites, e-commerce platforms, membership systems, and custom portals. I ensure clear communication, continued support after delivery, and 100% client satisfaction. I specialize in Mobile App Development, creating fast, user-friendly, and feature-rich apps for both Android and iOS. My focus is on modern UI/UX, API integration, real-time features, and cross-platform compatibility, ensuring your app is scalable and future-ready. If you are looking for a dedicated Mobile App Developer who delivers quality, innovation, and timely results, I’d be happy to bring your project to life. Best regards,

@shushmobiweb6

Hola, Soy desarrollador senior full-stack de Flutter + Firebase con más de 8 años de experiencia en la entrega de soluciones seguras, compatibles y basadas en pruebas. Anteriormente, he implementado encadenamiento de hashes tipo blockchain, almacenamiento WORM (bloqueo de retención GCS), flujos de trabajo de firmas digitales/QR e integraciones con proveedores de cumplimiento normativo (TicketBAI, AEAT, VeriFactu). Su implementación de la legislación antifraude se alinea directamente con mi experiencia en Firestore + Cloud Functions (Node 20), generación de PDF (pdf-lib) y registro de eventos/auditorías inmutables. Puedo garantizar el estricto cumplimiento de la Ley 11/2021 y el RD 1007/2023 mediante campos de factura inmutables, hashes encadenados, PDF canónicos con QR/leyenda, integración con Invopop, retención WORM y validación diaria de la raíz de Merkle. Sigo vectores de prueba deterministas, diseño de funciones idempotentes y pruebas unitarias/extremo a extremo basadas en CI para garantizar la reproducibilidad. El registro de eventos, la exportación para AEAT y los informes de evidencia de recuperación ante desastres se implementarán como entregables medibles. Propongo una entrega basada en hitos (configuración/WORM → hash/PDF/Invopop → Merkle/e2e → exportación/informe), con progreso transparente, mejores prácticas de seguridad (Secret Manager, reglas de acceso) y gestión proactiva de riesgos (idempotencia, concurrencia, límites XML/GCS). Gracias.

@loinguyen254

With over 6 years of experience, I have a strong foundation in web and mobile app development. My skillset, which includes using Flutter, Firebase, and Node.js, has been honed through various projects that require intricate coding and integration of systems. In fact, I have encountered scenarios similar to yours such as dealing with e-invoicing, QR and signature implementation (complying with legal specifications), WORM storage as well as API integrations. My portfolio also attests to the successful management of complex features like idempotency, Merkle-root signing, and hash chaining, which are essential elements required for your project's implementation. Furthermore, my expertise in the full development cycle from design to testing and deployment will ensure efficiency in meeting your technical minimum requirements. I foresee potential challenges such as errors in fnEmitirFactura due to provider latency and concurrency of correlational counters. However, my proactive nature allows me to strategically address these risks while maintaining high-quality deliverables. Impressed? Let's collaborate! As a part of our partnership, I will provide you with the vital documentation you need for any governance or auditing purposes. With me on board, not only do you get skillful technical execution but also someone with a willingness to understand your business needs and provide bespoke solutions. Let's make this project a digital success story!

@bryson41

Hola Omar, Estoy emocionado por la posibilidad de llevar a cabo la implementación de la Ley Antifraude en tu PWA de Flutter con Firebase. Tengo experiencia sólida en Firestore y Cloud Functions, así como en la integración de firmas y almacenamiento WORM, lo que me hace apto para cumplir con tus requisitos técnicos. Además, estoy preparado para asegurar que los campos inmutables y la lógica de hash se implementen eficientemente, y puedo manejar pruebas e2e para validar la integridad del sistema. Me gustaría saber si tienes algún diseño específico en mente para la implementación o si debería proponer algo. También, ¿tienes un cronograma preferido para los hitos propuestos? Espero con interés tu respuesta. ¿Hay algún otro aspecto del proyecto que consideras importante discutir antes de comenzar? Gracias, Bryson

@xuezhe315

As a seasoned software engineer well-versed in mobile app development and data management, I'm confident that I possess the skills and experiences to lead your project incorporating the Antifraud Law. I have extensive knowledge in Flutter, Firebase - including Firestore and Cloud Functions - which are critical components of your existing structure. Additionally, my past projects align perfectly with this job, having implemented various features such as digital signatures, QR codes, and data retention (WORM). More than just fulfilling technical requirements, I always focus on producing software that is secure, scalable and adaptable to future changes. My proficiency in working with complex data structures (like those in Firestore) ensures compliance with storage limitations while maintaining integrity and performance. Moreover, I can proactively anticipate potential issues like coordination of concurrent activities and supplier-related latencies through effective solutions and improved error handling. Combining my technical expertise with your vision for the PWA,I vow to deliver a secure,state-of-the-art platform that is irreproachable from an anti-fraud perspective. Let's join hand in taking your project to heights better than you can imagined.

@Alanfox10000

He trabajado en proyectos de cumplimiento antifraude (TicketBAI, VeriFactu, AEAT) con Firebase (Auth, Firestore, Storage, Functions v2 – Node 20) y flujos de firma digital, QR y WORM. Conozco bien los requisitos legales y técnicos que mencionas. Proyectos similares: • Integración TicketBAI con firmas + QR y almacenamiento WORM en GCP (10 años). • Facturación con hashes encadenados y Merkle-root diario (auditoría externa). • Flujos antifraude en Firestore con inmutabilidad y validación por fixtures/hash vector. Enfoque de pruebas y seguridad: • Tests deterministas para hashAct y snapshot tests para QR. • Reglas Firestore estrictas (no writes cliente en registro oficial). • Secret Manager para claves Invopop, idempotencia vía Idempotency-Key=documentID. • Circuit breaker + retries para evitar duplicados por latencia proveedor. Plan / Hitos: Setup + validaciones + WORM → 20% Cadena hash + Invopop + PDF/QR → 40% E2E + Merkle-root + export AEAT → 30% Evidencias DR + traspaso → 10% Timeline: 6–8 semanas con entregas por hito (PRs pequeños y testeables). Riesgos y mitigación: • Concurrencia → locks por transacción Firestore. • Tamaño XML >1MiB → guardar en GCS con referencia en Firestore. • Futuro VF/TBAI → flags de versión + Remote Config.

@oleksandrbosyi

Hello, I am Oleksandr, a seasoned web and mobile app developer with a diverse skill set that aligns perfectly with the technical requirements for your project. My experiences in working with PHP, JavaScript (including Flutter), Python, and Firebase Auth, Firestore, Storage & Functions precisely match your project's innovative tech stack. I have also worked with digital signatures, QR codes, and WORM storage in the past for various projects including compliance with governmental regulations like those of the AEAT. Regarding the project deliverables, I propose a - 1) meticulous setup and validation under a retention lock to ensure WORM functionalities are implemented well; 2) seamless integration of Invopop services to secure authentications, validate invoices against given schemas and store necessary information; 3) comprehensive end-to-end testing to ascertain proper functioning of Merkle-root signing and export processes; 4) finally, ensuring all desired evidence are recorded(logged), captured and correctly shared. While I am excited about this project's potential complexity, considering my proficiency in Pub/Sub, Secret Manager, using appropriate encryption methodologies to ensure idempotency and security alongside extensive experience with integrating various platforms including Invopop will mitigate any potential risks. I would be thrilled to collaborate together and deliver beyond your expectations. Let's discuss timelines and costs in detail. Thanks!

@AutomateBoring

Hi, Omar J. I 've check your project " Implementación Ley Antifraude (Ley 11/2021 + RD 1007/2023) en app Flutter + Firebase " carefully and understood what you want. I am senior full stack developer with 10 years of experience who is good at Web Development, Mobile App Development, API Integration, Node.js, Flutter, NoSQL Couch & Mongo, Google Firebase, Software Development and AngularJS and I think I can complete your project with similiar experience. I would like to have a brief discussion for your project very soon. Best regards, Benjamin

@GeorgeDevelop1

This aligns perfectly with what I specialize in, focusing on clean and automated solutions. I've worked extensively with Firestore, Cloud Functions, and QR integrations. I bring years of experience delivering professional, user-friendly, and secure systems off-platform to this project. Let's discuss how we can ensure a seamless implementation that meets every requirement set out. Open to a quick chat whenever it suits you! Regards, George