Telefonica CTO-Novum is seeking talented engineers to join our Engineering team. The challenges faced every day in extending and improving the Telefonica user experience require vast knowledge in how to produce highly maintainable and extensible object-oriented code. Our engineers must feel the need to build a product that works fast and flawlessly, be passionate about eliminating any problems as soon as they are discovered, and take pride in doing so.  The CTO-Novum group builds and operates the main application for Telefónica customers worldwide reaching more than 30 million active users. We work to build new and innovative products and to ease the access to all the services that Telefónica offers. 

- Develop and maintain software components in the language most appropriate to the problem. The main languages in use are Java/Kotlin, PHP and Javascript, but there are multiple other ones.  - High-quality design of product and infrastructure components for maintainability, robustness and scalability.  - Optimize application performance, with respect to CPU utilization, network traffic, data storage size, response time, and concurrency.  - Writing and maintaining effective automated test suites for delivered components.  - Analyze and eliminate security vulnerabilities, and bottlenecks in system performance.  - Working together with Site Reliability Engineers to deploy components and monitor them.  - Debug issues on the web and mobile websites, based on user reports.  - New features requisites understanding to design a solution to cover them. 

##  EDUCATION REQUIRED  - Computer Science, Telecommunication Engineer, etc.   ## SPECIFIC SKILLS  - Extensive knowledge of object-oriented programming and software architecture (preferably Java/Kotlin, other OOO languages are acceptable).  - Experience solving challenging performance problems, preferably related to web applications and distributed architectures based on microservices.  - Strong will to adhere to best practices in OO development and a need to leave well-structured code in your tracks.  - Knowledge of relational databases (MySQL) and other approaches to data management, particularly performance aspects.  - Strong analytical and problem-solving skills.  - Mobile and Javascript development experience is a plus.   ## TECHNICAL KNOWLEDGE  Nice to have:  - Frontend: ES6 (EcmaScript 6), React, Redux, npm, yarn.  - Backend: Java & Kotlin, Retrofit REST client, JAX-RS (Jersey) REST server, Dependency injection systems (Guice), Experience with unit/integration testing (JUnit/Spock)  - Automated build tools: Maven, Docker and Kubernetes  - Tools: Git; metrics and log tools as Graphite, Prometeus, Grafana and Kibana