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Senior Backend Software Engineer (Java/Kotlin)

Dental21 • English • Java • Kotlin • TypeScript • SQL • 4 months ago
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Location
In office
Seniority
Senior · 5+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 18, 2026. First seen by Alion on Jun 8, 2026. Dental21 scores D on the Alion truth index.

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Dental21

Dental21 is a German chain of modern dental practices based in Berlin, offering check-ups, cleaning, pain treatment, orthodontics, Invisalign, veneers, bleaching and dentures with long opening hours. It runs clinics in Berlin, Munich, Hamburg, Frankfurt, Dusseldorf, Bonn, Bremen, Dortmund, Dresden and other cities, and its sister company Patient21 builds the practice software that gives patients transparency on treatment and lets clinics work together. It hires dental assistants (ZFA), orthodontic staff and dentists for its practices, plus backend engineers in Kotlin and Java, product owners, dental billing testers and sales managers.
dental21.de • HQ: Berlin, Germany • Practice Management Software • Dental Clinics • 501-1000 employees

Who we are:

Long story short: Healthcare. Reinvented.

Our mission as a thriving start-up is to leverage health care through technology.

The software that we create enables patients to have full transparency about their treatment and makes it possible for the clinics to operate and collaborate internally in a brand new way.

Patient21's incredible international team of engineers is enjoying daily our tech ecosystem - Kotlin, Spring-Boot, React, TypeScript, Flutter, RabbitMQ, GraphQL, AWS, Docker, Kubernetes.

Getting out of your comfort zone and realizing your full potential sounds appealing?

If yes, you're in the right place - join our experienced engineers and leaders!

Our offer:

  • Exciting start-up atmosphere. Gone are the days in which you wait for approvals for months.

  • Make our disruptive product even better. Change how healthcare functions.

  • Work with state-of-the-art technology. No legacy code. No technological debt. All green field.

  • Your workplace-your choice. Office? Great! Home? Sure! Mars? Not sure about the Internet there, but why not.

  • Flexible working hours. No downtime. High degree of autonomy.

  • The team. Collaborative. Fun. True professionals. A real team.

Your mission:

  • Develop engaging web applications as part of a microservice architecture on new projects without legacy code and technological debt

  • Work on a complex software system that disrupts the way clinics work

  • Use your creativity to hack your way into proprietary systems

  • Raise the bar and drive technological innovations to keep us at the cutting edge

  • Apply continuous integration and deployment principles

  • Ensure code quality and maintainability by writing tests, doing code reviews and refactoring

Your talent:

  • Proven track record of developing with Java and/or Kotlin minimum of 5 years

  • Experience with Maven or Gradle

  • Experience with Spring Framework

  • Expert understanding of SQL databases

  • Experience with developing containerized applications

  • Experience with RabbitMQ or other messaging brokers

  • Experience with Kubernetes is a plus

  • Experience with Terraform is a plus

  • Proven experience in collaboration with AI tools like Codex or Claude Code

  • English working proficiency

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