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Desarrollador Javascript Web3

Fecha: 04-feb-2023

Ubicación: MADRID, ES

Empresa: Telefonica S.A.

Area description

The Consumer Innovation team main aim is to ideate and develop innovative products for consumers.



We create useful & desirable consumer experiences by :

· Enhancing existing B2C platforms

· Inventing new platforms and re-defining how audiences engage with them


Main activities


· Development of frontend solutions, microservices and modules to cover the product needs

· Support the rest of the team

· Look for alternatives/improvements/optimizations

· Evaluate third party solutions and decided if fits the project needs

· The candidate must be able to work with a transversal, cross-functional team (Engineering, UX, Commercial, Product Management).

· Ensure the technical feasibility of frontend architecture design

· Turn Product ideas into prototypes

· Hack existing technologies to find new relevant use-cases


Educational Background


Master of Science (MSc). Preferred Tecommunication/Computer Engineering, but any other branch/titulation will be considered given that software development expertise is proven.


Soft Skills

· Highly driven and results oriented

· Ability to adapt according to changes on the team needs

· Ability to work with distributed and heterogeneous teams

· Entrepreneurial thinking and acting, innovative and creative approach

· Consumer oriented mindset

· Used to manage uncertainty, the unknown and deal with the unexpected


Hard Skills

· Javascript stack expert

· Strong knwoledge of Web3 ecosystem

· Wide knowledge of Smart Contracts

· Basic knowledge of REST APIs

· Basic knowledge of Service Workers

· The candidate is used to work with common utilities such as Git, Yarn, NPM...

· Wide knowledge of Docker and the containers paradigm

· Strong SW development skills

· Strong knowledge of HTML5/CSS3

· CSS Pre-processors (CSS Modules, PostCSS, SaaS…)

· Nice to have: Experience setting up CI environments

· Nice to have: Testing tools (Cypress, Puppeteer…)

· Nice to have: Experience using WebRTC

· Nice to have: Experience using Unity

· Nice to have: Experience using WebAR/ARKit


Professional Experience


· At least 1 years experience in a software development

· At least 1 years experience working within a B2C environment

· Experience in developing software for consumers

· Experience in working in a multi-functional team




· Spanish - Full professional proficiency

· English - Working proficiency


If you join Telefónica

You join almost 100 years of history, you join a team of 106 nationalities present in more tan 35 countries. You join a team that works to connect people wherever they are. We are leading the digital revolution with the enthusiasm of the first day in all our businesses, creating the best digital ecosystem for our clients: network, IoT, cloud, security, innovation etc. Here, at Telefónica you count with everything you need to be the best you. We need people like you that wants to take this challenge of creating the Telefónica of tomorrow.

Telefonica is committed to the new working ways. Under our proposition “Disconnect to Reconnect” we have applied the Digital Disconnection.



We strongly believe diverse and inclusive teams become more innovative and they achieve improved results. Telefonica aims to promote and guarantee a place for everyone, just the way we are: gender, age range, sexual orientation and/or identity, culture, creed, disability or any other personal condition.