S

Backend Developer (m/f/d)

SALT • Germany
Full Remote
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Build and maintain modern backend applications, REST APIs, and integrations using PHP or Kotlin. Translate complex technical requirements into robust, scalable software solutions in a remote-first environment. Require strong PHP/Kotlin experience, excellent German (C1), very good English, and knowledge of OOP and REST APIs.

Key Highlights
100% remote work within Germany
Backend development with PHP or Kotlin and MySQL
REST API design and documentation using OpenAPI
Strong German (C1) and very good English required
Opportunity to own technical solutions across systems and teams
Key Responsibilities
Developing and maintaining backend applications using PHP or Kotlin, working with databases such as MySQL
Designing, building and documenting REST APIs using OpenAPI
Developing integrations between internal applications and external systems
Working with Kotlin-based components and structured data interfaces, including FHIR-based specifications
Translating complex technical requirements into robust, maintainable and testable software
Improving existing applications, troubleshooting issues and ensuring the stability of production systems
Taking ownership of technical solutions and coordinating changes across different systems and teams
Technical Skills Required
PHP or Kotlin REST APIs MySQL
Benefits & Perks
100% remote – work from anywhere in Germany
Occasional travel to company headquarters
Collaborate closely with development and IT teams
Take ownership of meaningful technical challenges
Nice to Have
Experience with FHIR/HL7 or other structured data standards
Knowledge of certificate-based authentication
Experience operating, monitoring and maintaining production systems

Job Description

Backend Developer (m/f/d) | 100% Remote within Germany

Build modern backend solutions and shape the future of technology!

Are you a Backend Developer who enjoys building reliable, scalable systems and developing solutions that make a real impact? We're looking for an experienced developer to help design, build and enhance backend applications, APIs and integrations within a modern technology environment.

What you'll be doing:

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