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Senior Full-Stack Software Engineer

Celonis
Madrid, Spain
Full Time
Posted November 7, 2025
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Job Description

A Senior Full Stack Software Engineer at Celonis is responsible for designing, developing, and maintaining scalable frontend and backend applications, collaborating with cross-functional teams to deliver high-quality, reliable solutions that enhance operational workflows and automation.

Key Responsibilities

  • Design, develop, and maintain scalable, high-quality software solutions across frontend and backend systems.
  • Collaborate with cross-functional teams to translate business requirements into technical implementations.
  • Ensure system reliability, security, and performance through design and testing.
  • Write clean, maintainable, and efficient code following best practices and standards.
  • Participate in code reviews to ensure quality and adherence to architectural guidelines.
  • Contribute to system architecture discussions and shape technical direction.
  • Mentor and support junior engineers to foster technical growth and excellence.
  • Troubleshoot, debug, and optimize existing systems to improve performance and user experience.

Requirements

  • Five (5) years of professional experience developing and maintaining full-stack applications.
  • Strong proficiency in one or more backend languages such as Java and NodeJs, or other backend languages.
  • Solid experience with modern frontend frameworks such as Angular and/or React.
  • Familiarity with RESTful APIs and microservices architectures.
  • Experience with relational databases such as PostgreSQL and MySQL, and NoSQL databases such as MongoDB.
  • Understanding of cloud environments and deployment tools including AWS, Docker, Kubernetes, and CI/CD pipelines.
  • Proven ability to write well-tested, maintainable, and scalable code.
  • Excellent problem-solving skills, attention to detail, and a collaborative mindset.
  • Strong communication skills and ability to work effectively in cross-functional teams.

Benefits & Perks

generous PTO
hybrid working options
company equity RSUs
comprehensive benefits
extensive parental leave
dedicated volunteer days
gym subsidies
counseling and well-being programs
internal mobility and mentorship opportunities
clear career paths

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