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Senior Software Back-end Developer in Madrid


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Job Description

Job Purpose

We are hiring a software developer with knowledge about Javascript technologies and especially Amazon serverless, AWS stack products and cloud architectures, with at least 6 years of experience and a good level of English, written and spoken.


The candidate will join to an international and high technical level team, with responsibilities and objectives on a local and global software projects. Key responsibilities include the following:

  • Maintain the business backend Web platforms code, solving bugs.
  • Develop the new features according improvements planning and CoStar best practices.
  • Test and document the new features developed.
  • Participate in global and international software projects of the Company.


  • Acquire knowledge about the current platform architecture and code.
  • Integrate in the actual and future team, with a high collaborative attitude.
  • Participate in Belbex products improvements and maintenance.
  • Participate in global software projects.

Knowledge, Skills, Experience


  • Experience with Javascript (NodeJS) ES6.
  • Experience with Webpack.
  • Experience with serverless and microservices architectures.
  • Familiarity with Restful API.
  • Experience with common AWS stack products: AWS Lambda, API Gateway, S3 storage service and IAM, in processional environments.
  • A good level of spoken and written English
  • Social, responsible and has attention to detail
  • Task and results oriented


  • Professional experience with ElasticSearch.
  • Experience with the following AWS stack products: Cognito, SQS and Kinesis.
  • Experience with third party products related, especially Terraform.
  • Knowledge on internationalized web applications.
  • Third-party products interfaces.

Join CoStar and start your dynamic career with us!

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