Fullstack Engineer - React & Node/Python (PWA Specialty)

We are looking for a Fullstack Developer with at least 3 years of experience in mobile application development using Progressive Web Apps (PWA) to participate in the end-to-end delivery of a React-based mobile project. Please note this is a 4-month temporary contract.

The selected candidate will work on a solution with a strong focus on performance, user experience, offline functionality, and efficient data synchronization.

Responsibilities

• Analyze, design, and develop the project end-to-end.
• Develop a mobile-first PWA using React and TypeScript.
• Design and develop APIs connected to PostgreSQL.
• Implement processes for efficient image management and storage.
• Implement client-server synchronization processes and offline functionality.
• Analyze and optimize application performance and architecture.
• Define mobile-oriented UI/UX solutions.
• Integrate authentication using OAuth 2.0 with Microsoft.
• Handle the deployment of the solution.

3+ years of experience in mobile-first PWA development with React and TypeScript.

• Experience developing APIs with Python/FastAPI and/or Node.js.
• Experience working with PostgreSQL.
• Experience with offline-first applications or limited connectivity environments.
• Experience with caching strategies and offline functionality in PWAs.
• Hands-on experience with Service Workers and IndexedDB.
• Experience in image management and optimization for web/mobile applications.
• Experience in client-server synchronization and offline data management.
• Experience with OAuth 2.0 and/or Microsoft Entra ID (Azure AD).
• Experience with deployments on AWS and/or Azure.
• Experience in web/mobile performance optimization.
• Strong understanding of mobile-oriented UI/UX.
• Spanish at fluent or native level is Mandatory
• Ability to work autonomously and contribute to architectural decisions.

Nice to Have / Optional

• Experience with offline-first architectures and data synchronization conflict resolution.
• Experience with Microsoft Graph API, particularly integration with Microsoft Teams and email services for sending notifications.

• Remote position working in the Spain time zone.
• Be part of a multicultural team working on international projects.
• Temporary / Contract (4 months)

If you are passionate about data, development & tech, we want to meet you!

• Talan Spain's commitment to non-discrimination based on gender, race, ideology, or any other reason, in accordance with the company's "Equality Plan" and the current regulations on gender equality between women and men (Royal Decree-Law 6/2019).

Talan - Positive Innovation Talan is an international consulting group specializing in innovation and business transformation through technology. With over 7,200 consultants in 21 countries and a turnover of €850M, we are committed to delivering impactful, future-ready solutions. Talan at a Glance Headquartered in Paris and operating globally, Talan combines technology, innovation, and empowerment to deliver measurable results for our clients. Over the past 22 years, we've built a strong presence in the IT and consulting landscape, and we're on track to reach €1 billion in revenue this year. Our Core Areas of Expertise * Data & Technologies: We design and implement large-scale, end-to-end architecture and data solutions, including data integration, data science, visualization, Big Data, AI, and Generative AI. * Cloud & Application Services: We integrate leading platforms such as SAP, Salesforce, Oracle, Microsoft, AWS, and IBM Maximo, helping clients transition to the cloud and improve operational efficiency. * Management & Innovation Consulting: We lead business and digital transformation initiatives through project and change management best practices (PM, PMO, Agile, Scrum, Product Ownership), and support domains such as Supply Chain, Cybersecurity, and ESG/Low-Carbon strategies. We work with major global clients across diverse sectors, including Transport & Logistics, Financial Services, Energy & Utilities, Retail, and Media & Telecommunications.