Hybrid Junior Backend Developer

at Tomorrow

• Job title: Junior Backend Developer
• Job type: Full Time
• Experience level: Junior
• Salary: €43,000 - €49,000 per year
• Degree requirement: Bachelor's Degree
• Tech skills: Docker, Gradle, Java, JUnit, Kafka, Kotlin, Mockito, Postgres, Spring, Spring Boot, SpringBoot, SQL
• Location requirements: Hybrid, Hamburg, Germany

About the role

• Junior Backend Developer creating backend services in Kotlin and Java for a sustainable finance platform. Collaborating with teams to develop solutions for onboarding, compliance, and customer support.

Responsibilities

• As a Junior Backend Developer (m/f/d) you will work on real, meaningful problems: seamless onboarding processes, KYC procedures, GDPR-compliant systems, support automation, and the infrastructure that makes Tomorrow a trusted banking partner.
• You will program in Kotlin and Java, collaborate with cross-functional teams, and grow your skills with mentoring from experienced engineers — all while building products that drive sustainable banking.
• Design and develop backend services using Kotlin and Java (Spring Boot, PostgreSQL, Kafka)
• Build features in onboarding, compliance tools, and customer support automation
• Collaborate with Stream Leads, designers, and cross-functional teams
• Participate in code reviews and contribute to technical documentation
• Troubleshoot as part of third-level support
• Take part in Communities of Practice for knowledge sharing and professional development
• Help shape processes to reduce manual work and increase efficiency

Requirements

• 1–2 years of professional software development experience (including internships, bootcamps, or substantial personal projects)
• Basic knowledge of Java and Kotlin: you have worked with these languages and understand their core concepts
• Basic SQL knowledge: you can write queries, understand joins, and work with databases
• Basic knowledge of Git: you are familiar with branching, merging, and pull requests
• Basic knowledge of Gradle: you understand how to declare and manage dependencies
• Understanding of REST APIs and HTTP fundamentals: you know how web services communicate
• Nice to have: experience with PostgreSQL, Kafka, Spring Boot, Docker, or testing frameworks (JUnit, Mockito)
• Nice to have: familiarity with CI/CD pipelines and basic DevOps concepts
• You are fluent in English (advanced level C1), both written and spoken
• Basic German (A2) is a plus but not required
• You are eager to learn and not afraid to ask questions or seek feedback
• You enjoy working collaboratively and have strong communication and problem-solving skills.

Benefits

• It will be fun — we promise.
• Together with over 60 like-minded colleagues, you will work every day to engage people with sustainable finance.
• Our culture is built on our values, an active New Work philosophy, and clear, ambitious goals.