Senior Backend Engineer: Kotlin & AWS Modernisation

intro; España; On-site; PHP 5,084,000 - 7,988,000; Full time

Job summary

Intro is seeking a Senior Software Engineer to modernise our platform by migrating from PHP to Kotlin while staying hands-on in development and delivery, owning critical backend components and shaping how the platform evolves. You will collaborate with engineering and product teams, bring strong Java or Kotlin skills, and apply deep backend engineering experience to build scalable services.

Experience with cloud technologies, ideally AWS, and a track record of delivering reliable, maintainable

Qualifications

• Strong commercial experience with Java or Kotlin.
• Strong backend software engineering experience.
• Currently hands-on with coding and comfortable working in a highly technical role.
• Experience with cloud technologies, ideally AWS.
• Experience building and maintaining modern, scalable backend applications.
• Strong communication and collaboration skills.
• Comfortable working within a smaller engineering team with significant ownership.

Responsibilities

• Hands-on development and delivery in a small engineering team.
• Contribute to major modernization and migration projects (PHP to Kotlin).
• Collaborate with engineering and product teams.
• Own technical decisions and platform evolution.
• Drive scalable backend applications and cloud-native architectures.

Skills

Java

Kotlin

Backend engineering

AWS

Hands-on coding

Communication

Job description

Intro is seeking a Senior Software Engineer to modernise our platform by migrating from PHP to Kotlin while staying hands-on in development and delivery, owning critical backend components and shaping how the platform evolves. You will collaborate with engineering and product teams, bring strong Java or Kotlin skills, and apply deep backend engineering experience to build scalable services.

Experience with cloud technologies, ideally AWS, and a track record of delivering reliable, maintainable