Role Description A Java Back-end Developer focuses on building robust, secure, and highly-available server-side systems and APIs that power products, working closely with front-end engineers and architects to ensure performance benchmarks are consistently met. - Design and implement microservices and distributed systems using Java and the Spring ecosystem, following established architectural patterns. - Develop secure, high-performance RESTful APIs that are consumed reliably by both web and mobile client applications. - Model, optimise, and manage relational and NoSQL databases to support scalable, data-intensive workloads. - Implement authentication and authorisation mechanisms using OAuth2, JWT, and Spring Security best practices. - Identify and resolve performance bottlenecks through profiling, load testing, and targeted refactoring of critical code paths. - Integrate third-party services, payment gateways, and external APIs in a maintainable and testable way. - Write comprehensive unit and integration tests to maintain high coverage and prevent regressions across services. Qualifications - 3+ years of professional Java back-end development with deep knowledge of the JVM and core Java libraries. - Strong hands-on experience with Spring Boot, Spring Cloud, and ORM frameworks such as Hibernate or JPA. - Solid understanding of microservices architecture, including service discovery, load balancing, and inter-service communication. - Experience with relational databases (PostgreSQL, MySQL) and caching solutions like Redis. - Practical knowledge of message brokers such as Kafka or RabbitMQ for building event-driven services. - Comfortable with Docker, Kubernetes, and setting up or maintaining CI/CD pipelines in cloud environments. - Proficiency in English.

Role Description A Java Web Developer builds and maintains dynamic web applications using Java-based server-side technologies, developing features across the presentation and application layers in collaboration with designers, back-end engineers, and stakeholders. What We Expect From You: - Develop server-side web logic using Java EE, Jakarta EE, or Spring MVC, building maintainable and well-tested application components. - Build and maintain web UIs using templating engines like JSP or Thymeleaf, or integrate with modern JavaScript front-end frameworks. - Design and query relational databases using MySQL, PostgreSQL, or Oracle, ensuring efficient schema design and query performance. - Implement and consume RESTful web services, documenting endpoints clearly for front-end teams and third-party consumers. - Ensure cross-browser compatibility and responsive layouts across a range of devices and screen sizes. - Apply web security best practices including OWASP guidelines, CSRF protection, and XSS prevention throughout the application layer. - Maintain and deploy applications on servlet containers such as Tomcat or JBoss, supporting both on-premise and cloud environments. Qualifications - 2+ years of Java web development experience with a solid understanding of the request-response lifecycle and HTTP fundamentals. - Practical experience with Spring MVC or Java EE / Jakarta EE for building enterprise-grade web application components. - Proficiency in HTML5, CSS3, and JavaScript (ES6+) for building and styling interactive front-end pages. - Experience with server-side templating using Thymeleaf, JSP, or a comparable view technology. - Solid SQL skills and experience using JDBC, JPA, or Hibernate to interact with relational databases. - Familiarity with deploying applications to Tomcat, JBoss, or WildFly in development and production environments. - Proficiency in English.

Role Description A Java Full Stack Developer designs, develops, and maintains both the client-side and server-side of web applications. You own features end-to-end, from database schema and REST API design through to responsive UI components, collaborating closely with product, design, and DevOps teams to ship high-quality software at pace. - Build and maintain scalable back-end services using Java and Spring Boot, ensuring high availability and clean service boundaries. - Develop responsive, accessible front-end interfaces using React, Angular, or Vue.js in close collaboration with UI/UX designers. - Design, query, and optimise relational databases such as PostgreSQL or MySQL, as well as NoSQL stores like MongoDB where appropriate. - Create and consume RESTful and GraphQL APIs that are secure, well-documented, and easy for other teams to integrate. - Write unit, integration, and end-to-end tests using tools like JUnit, Mockito, and Selenium to maintain high code quality. - Participate actively in code reviews, architectural discussions, and help uphold engineering standards across the team. - Deploy and monitor applications on cloud platforms (AWS, GCP, or Azure) using CI/CD pipelines and containerisation tools. Qualifications - 3+ years of Java development experience, with a strong understanding of OOP and design patterns. - Hands-on experience with Spring Boot, Spring MVC, and Spring Security for building production-grade applications. - Proficiency in at least one front-end framework — React, Angular, or Vue.js — alongside HTML5 and CSS3. - Solid experience working with both relational (SQL) and NoSQL databases in a professional setting. - Familiarity with Git version control, Docker for containerisation, and basic Kubernetes concepts. - Proven ability to design and implement RESTful or GraphQL APIs with attention to security and performance. - Proficiency in English.

Role Description We are looking for a motivated Backend / Full-Stack Developer Intern to support the development of Occibo mainly open to work in early stage startup. Duration: 3–6 months / Compensation: Unpaid mandatory internship You will work on the technical development of Occibo, mainly on backend services, APIs, database logic, file handling, AI workflow integration, and selected full-stack features. This role is ideal for a student who wants hands-on experience building a real SaaS product using modern backend and AI infrastructure. - Build and improve backend APIs using Node.js, TypeScript, and Express.js - Work with Supabase for database, authentication, and data management - Support file storage workflows using Cloudflare R2 - Help build AI workflow orchestration for book creation, illustration, layout, and export - Work with queue-based processing using Redis and BullMQ - Support integration with AI image-generation workflows such as ComfyUI - Create clean, maintainable, and well-documented code - Debug, test, and improve existing backend services - Support selected frontend or full-stack tasks when needed - Collaborate with product, design, and content team members Qualifications - You have hands-on knowledge of JavaScript / TypeScript - You understand backend development, APIs, databases, and Git - You are interested in early stage AI, SaaS products, and product development - You can work independently in a remote setup - You write clean code and are willing to learn - You are reliable, curious, and proactive Benefits - Real experience building an AI SaaS product from early stage - Hands-on work with modern backend and AI infrastructure - Exposure to product thinking, architecture, and startup execution - Opportunity to work directly with the founder - Remote and flexible working setup - Internship certificate after successful completion - Recommendation letter based on performance Company Description IndieKidz GmbH is a young Berlin based startup building meaningful learning experiences for children. We create screen free books, magazines, and activities that blend early learning with cultural roots. Alongside this, we are building Occibo, a modern platform for authors and publishers. Occibo uses AI assisted workflows to simplify children’s book creation. Together, we combine creativity, technology, and real publishing needs. Our goal is to make high quality children’s content easier to create and joyful to use.