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

Description

**Company Description** **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.** **Job Description** **Contract Type:** Temporary / Contract (4 months) 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. **Qualifications*** **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. * 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. **Additional Information** * B2B or freelancer contract. * 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\).