Senior Softwareentwickler:in Kotlin/Java (full remote)

About the Position

Senior Softwareentwickler:in Kotlin/Java (full remote)

We are seeking a Senior Softwareentwickler:in Kotlin/Java for full remote work, focusing on backend system development with Kotlin, Docker, and PostgreSQL.

Responsibilities

• As a Senior Softwareentwickler:in Kotlin/Java, you will be the key player in the further development of our backend systems.
• With Kotlin, Docker, and PostgreSQL, you will build robust, scalable modules that form the backbone of our medical software.
• Together with your team from development, design, DevOps, and product management, you will bring complex systems to life, rethink interfaces, and maintain high code quality.
• You will design, develop, test, and document-always with the goal of creating simple, extendable, and sustainable solutions.
• This position can be performed 100% from home. You do not need to live in or near Thuringia to work with us, but you can choose when and where you work.
• Part-time employment is also generally possible, but it would be ideal if you could commit at least 32 hours per week.

Requirements

• You have successfully completed a scientific degree (PhD preferred) and can be genuinely proud of your excellent results.
• You have several years of experience in backend development, preferably with Kotlin (or Java), and are familiar with PostgreSQL and containerized architectures.
• Terms like Domain-Driven Design, API-Design, and Softwarearchitektur are not buzzwords for you but your daily tools.
• You work structured, independently, and never lose sight of the big picture even in complex systems.
• Your initial experience with agentic software development (e.g., CLI-based AI programming via Claude Code / Codex) or in the field of Vibecoding is welcome.
• If you enjoy taking responsibility, shaping technical concepts, and actively influencing architectural decisions, you are exactly who we are looking for.
• You like exchanging ideas with the team, think outside the box, and are eager to make medical software truly better.
• To fully integrate into our team, it is essential that you have at least C1-level proficiency in German.

We Offer

• Super Team and flat hierarchies
• Job Crafting/individual work design
• Flexible working hours
• Professional development
• Home Office/Mobile working
• Team events
• Promotion of physical and mental health
• Company pension scheme
• Company health insurance
• Bicycle leasing/Jobrad
• Hardware leasing
• Employee discounts
• Childcare cost subsidy/Daycare subsidy
• Recovery allowance
• Meal allowance
• Travel allowance
• Work abroad

About the Company

We are an innovative, creative, and not-so-young family business located near paradise in Jena. Together as a team, we continuously develop tomedo®, our rapidly growing Apple-based software for doctor's offices, which achieved the highest customer satisfaction in independent surveys.

Flat hierarchies and a communicative working environment give your creativity and ideas room to shape exciting projects. Home Office and flexible working hours also give you the opportunity to design your everyday life according to your ideas. We offer you the chance to develop yourself and actively drive the growth of zollsoft GmbH.

Why wait? Become a zollsoftie and grow with us!

Apply Now

Upload your comprehensive application including cover letter, CV, and relevant certificates (school, training, university, and work certificates) easily on our homepage. As soon as your application arrives with us, you will receive an automatic confirmation by email.

Do you have any questions? Simply contact our HR department. Sabrina, Tom, Emilia, Aline, and Elisa are happy to answer any queries. You can reach them at [email protected]. Further information can also be found on our website.