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

Talan; España; Presencial; EUR 46.872 - 72.540; Jornada completa

Descripción de la vacante

Talan Spain is seeking a Fullstack Developer for a 4-month contract to deliver a React-based mobile project with a strong focus on performance, offline capability, and efficient data synchronization.

You will design, implement, and deploy a mobile-first PWA using React and TypeScript, build APIs with Python/FastAPI or Node.js, and work with PostgreSQL while ensuring a smooth user experience.

Formación

• 3+ years of experience in mobile-first PWA development with React and TypeScript.
• Experience developing APIs with Python/FastAPI and/or Node.js.
• Experience with PostgreSQL.
• Experience with offline-first PWAs and data synchronization.
• Hands-on with Service Workers and IndexedDB.
• Experience with OAuth 2.0 and Microsoft Entra ID.
• Deployments on AWS or Azure.
• Strong mobile-oriented UI/UX understanding.
• Ability to work autonomously and influence architecture.

Responsabilidades

• 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 image management and storage processes.
• Enable client-server synchronization and offline functionality.
• Analyze and optimize performance and architecture.
• Define mobile-oriented UI/UX solutions.
• Integrate OAuth 2.0 with Microsoft Entra ID.
• Handle deployment of the solution.

Conocimientos

React

TypeScript

PWA

OAuth 2.0

Offline-first

Herramientas

Python/FastAPI

Node.js

PostgreSQL

Service Workers

IndexedDB

AWS

Azure

Microsoft Entra ID

Microsoft Graph API

Descripción del empleo

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).