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# Backend Developer

- **Company:** Aizon
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Amazon Web Services, Unit Testing, Big Data, Software as a Service, Node.Js, Platform as a Service (PAAS), Web Applications, Scripting, Express.js, AWS Lambda, Indexer, Backend, Git, Information Technology, Code Restructuring, Mocha, Serverless Computing, Jasmine, Programming Languages
- **Published:** September 24, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

+ Bachelor or Master's degree in Computer Science or equivalent knowledge and experience
 + Experience at least 3 years architecting and maintaining large scale web applications (creating REST structures in the Backend, escalating a massive access platform, etc)
 + Understand the importance of testing your code and how it reduces the risk of making changes and refactoring
 + Basic knowledge of Unix/Linux systems, utilities, and scripting
 + Good level and recent experience of NodeJS + ExpressJS
 + Fluency in unit testing (e.g. Jest/Jasmine/Mocha)
 + Good knowledge of GIT
 + Nice-have
 + Desirable knowledge and experience of Indexing and experience managing Big Data, AWS Lambda development and with Serverless Architecture
Skills

 + Proficient in spoken and written English
 + Capable of working with a dynamic product that is ever-changing and evolving rapidly
 + Strong analytical and creative problem-solving skills
 + Ability to take smart risks and champion new ideas
 + Team player, collaborative, innovative, get things done mind
 + Ability to understand business requirements and translate them into technical requirements
 + Show initiative in setting and meeting goals within an environment of managed change
 + Ability to work under pressure, responsible for multiple important tasks in parallel
 + Commitment to quality

## Description

Managing existing and implementing new functionalities based on the most modern technologies required for multi-instance SaaS and PaaS implementations

 - Working with team members to troubleshoot and improve current back-end applications and processes
 - Using his or her understanding of programming languages and tools in order to analyze current trends and industry developments, formulating more efficient processes, solving problems, and creating a better experience for our users
 - Reporting to the Backend Developer Team Lead
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Responsibilities

 + Implementing server side code (AWS Lambdas,…)
 + Assume technical ownership of various services and components of the SaaS and PaaS implementations
 + Implementing unit tests for delivered features
 + Managing documentation for the assigned tasks
 + The job follows a quality system based on efficiency and continuous learning
 + The development has to be oriented towards serverless architecture
 + Cooperate with other team members (developers, architect, testers, product management)


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