(Junior) Backend Web Developer (m/f/d) - Mobile Services

Join our dynamic team as a Backend Developer with AI Focus and play a pivotal role in shaping cutting-edge solutions that harness the power of artificial intelligence. You will be responsible for designing, developing, and maintaining backend systems that support AI-driven applications, ensuring scalability, efficiency, and performance.

Role Overview anyone-ai is seeking a Backend Developer focused on AI training. This position centers on building and maintaining backend systems that power advanced AI technologies. The work supports the development and refinement of machine learning models. What You Will Do Develop backend systems that enable AI research and model training Work closely with the AI research team to improve machine learning models Help enhance and maintain training datasets for quality and reliability Location This role is based in Germany.

Join our dedicated team at europeanhomecaregmbh as a Psychologist (m/f/d) in Berlin. We are seeking an empathetic and skilled professional to provide mental health support and counseling services to our diverse clientele.

Role Overview check24 is looking for a Full-Stack Developer (m/f/d) with a strong backend focus to join the team in Erfurt. This position centers on designing and building backend solutions that support and improve web and application products. What You Will Do Develop and implement backend systems that power web and app features Work closely with developers and DevOps specialists to deliver reliable, maintainable software Contribute to seamless integration between frontend and backend components Support project success by ensuring backend performance and scalability Who We're Looking For Strong interest in backend development within a full-stack context Motivation to collaborate and share knowledge with a skilled team Drive to improve technology and deliver solutions that help customers

Anyone AI is seeking Backend Developers to join project-based consulting work with a prominent AI research lab. This remote, part-time role centers on designing and evaluating realistic software engineering tasks for AI training, with a focus on backend systems. Role overview As a Backend Developer – AI Trainer, the position involves crafting and reviewing coding scenarios that mirror real-world engineering challenges. Typical tasks include bug resolution, feature implementation, refactoring, and test creation. The work will also require reviewing peer submissions to ensure they meet quality standards. What you will do Create and implement multi-file coding tasks, including bug fixes, new features, refactoring, and test generation. Draft clear, natural language specifications and provide reference implementations. Develop and expand unit and integration test suites. Review peer-generated tasks for accuracy, clarity, and feasibility. Identify edge cases, ambiguities, and potential failure points. Ensure specifications, code, and outputs remain consistent and aligned. Requirements Professional fluency in written English and strong communication skills. 3 to 7 years of hands-on experience in software engineering. Advanced knowledge of Python and JavaScript or TypeScript, plus working familiarity with Java, C#, or Go. Experience in backend or full-stack development in production environments. Proficiency with testing frameworks such as pytest, Jest, JUnit, xUnit, or Go testing tools. Ability to debug and work within large, multi-file codebases. Comfort with code reviews, refactoring, and production migrations. Engagement details Part-time, project-based consulting Remote work Location: Germany Expected outcomes Deliver high-quality, production-ready outputs for AI training and evaluation.

About the RoleWe are on the lookout for two highly skilled backend engineers to join our dynamic team in Berlin. You will be instrumental in advancing the development and implementation of our technology, enhancing our capacity to create core backend functionalities, and empowering other teams to utilize this backend for their projects.If you have a passion for creating exceptional products, thrive in a fast-paced environment, and are eager to contribute to the success of an ambitious startup, this is the perfect opportunity for you.Our Tech Stack:Python / FastAPIPostgreSQL / MongoDB / ElasticCloud LLM providers + bare metal GPUsGCPAs an early team member, you will assume significant responsibilities from day one, with the chance to influence our technological architecture and infrastructure.Join one of the most ambitious AI companies today, collaborating with a world-class team of experts in their fields, and experience an incredibly stimulating work environment. In This Role You WillLead the delivery of complex projects, coordinating with cross-functional teams, and ensuring timely completion of essential components.Develop a deep understanding of Reliant's vision and integrate this into your architectural and process decisions in daily operations.Offer insights to refine UI/UX concepts and assist in the planning of backend and infrastructure development.Take proactive responsibility for long-term code quality and architecture. About YouThe ideal candidate will have a proven track record in backend or full-stack development, with a focus on rapid innovation and effective systems design that supports growth opportunities for both the product and the team.To thrive in this role, you should possess the following skills and experiences:5+ years of demonstrated experience in building backend services or distributed systems.Ability to design, develop, test, and maintain backend services and APIs that support product features, including writing robust, production-quality code.Engage in system and service design; contribute to architectural discussions and make informed trade-offs regarding scalability, latency, cost, and reliability.Navigate ambiguity effectively; translate vague or high-level requirements into actionable implementation plans.Collaborate with cross-functional partners including product management, frontend, UX, data, and operations to define requirements, plan implementations, and deliver features.Ensure high code quality by writing, reviewing, and improving unit/integration tests; actively participate in code reviews.

Role Overview Sopra Steria is looking for an AI Backend Developer (m/w/d) to help build and improve AI-driven backend systems for public sector projects. This position is open to candidates across Germany (bundesweit). What You Will Do Develop and maintain backend components that power AI solutions for public sector clients Work with modern technologies to create scalable and efficient systems Contribute ideas and code that support digital transformation and better digital services for citizens About Sopra Steria Sopra Steria delivers digital solutions and consulting for public and private sector organizations. The team focuses on practical innovation and improving everyday experiences through technology.

Join our dynamic team at CHECK24 as a Full-Stack Developer with a focus on backend technologies. You will be responsible for developing innovative solutions that enhance our digital platforms and services. Collaborate with cross-functional teams to drive projects from concept to completion, ensuring high performance and responsiveness of applications.

As an established IT service provider, we create modern, scalable software solutions for clients across various industries. We leverage the latest technologies, agile methodologies, and a passionate team dedicated to crafting digital products. We are looking to strengthen our team with experienced Senior Backend Developers / IT Consultants (m/f/d) who love technological diversity, enjoy holistic problem-solving, and provide competent consulting to our clients.You will develop end-to-end solutions that deliver real value to our clients while actively designing microservices and modern software architectures.You will build and operate high-performance backend services using Java or Kotlin, utilizing Spring Boot for complex software implementation, and reliably integrating databases and external interfaces.You are committed to high software quality, employing automated testing and clean code principles.You will confidently guide clients through architecture, technology, and implementation questions, translating technical concepts into understandable terms.You will collaborate closely with UX/UI designers, product owners, and developers from other disciplines, actively contributing to agile teams.You will conduct code reviews, provide constructive feedback, and ensure adherence to best practices, architectural guidelines, and high code quality within the team.

Join our agile team as a PHP Backend Developer, where you'll be responsible for crafting innovative technical solutions to complex challenges, including defining interfaces using OpenAPI.Your proficiency with at least one popular PHP framework will enable you to quickly navigate our applications, which are developed using various frameworks tailored to meet specific requirements.As a young and dynamic company, we prioritize high-quality code development based on PHP 8, supported by manual code reviews and automated checks through CI tools such as Travis, Scrutinizer, and Codecov.

Join our dynamic team at Sopra Steria as a Werkstudent in Frontend and Backend Development! This is an exciting opportunity for students looking to apply their academic knowledge in a practical setting while contributing to innovative projects.

About Apaleo Apaleo builds an open, API-first property management platform for the hospitality industry. The company’s modular infrastructure helps hotels customize their technology, automate routine work, and deliver tailored guest experiences. Apaleo’s platform includes advanced applications and AI agents that adapt to each guest’s needs. Role Overview The Senior Backend Engineer (.NET) will shape the foundation of Apaleo’s public API layer. This position focuses on creating the Storefront API, a scalable interface that lets external systems, such as ChatGPT and booking platforms, connect directly with Apaleo. The work combines backend engineering with AI, starting from a clean API design and moving toward systems that support intelligent, agent-driven guest interactions. What You Will Do Design and implement the Storefront API for Apaleo’s property management platform Develop scalable, reliable backend solutions in .NET Enable integrations with external partners and booking platforms Build systems that support agentic booking and AI-powered guest experiences Work with a high degree of autonomy on architecture and deployment decisions Location This role is based in Munich.

About the Role CHECK24 is looking for a Working Student (m/f/d) in IT with a focus on Software Development and Artificial Intelligence. This position is based in Hamburg and offers practical experience alongside ongoing studies. What You Will Do Support software development projects that use AI technologies Work closely with experienced developers and team members Contribute to ongoing projects and learn from real-world challenges Why Join Gain hands-on experience in software development and AI Work on projects that shape digital products and services Collaborate with a skilled team in a supportive setting

Join Timocom GmbH as a Backend Software Developer and contribute to the development of innovative software solutions that shape the future of logistics and transportation. In this role, you will collaborate with a dynamic team to design, implement, and maintain backend systems that provide seamless experiences for our users.

Join our innovative team at redcare-pharmacy as a Senior Backend Engineer and play a pivotal role in developing cutting-edge backend solutions. You will work closely with cross-functional teams to design, implement, and maintain robust systems that enhance our pharmacy services.

Join our dynamic team at MSX International as a Product Designer focused on sales. In this role, you will leverage your creativity and analytical skills to design user-centered products that not only meet market demands but also drive sales growth. Collaborate with cross-functional teams to translate business requirements into innovative design solutions that enhance user experience and maximize profitability.

Join check24 as a Junior Fullstack Developer and be part of our innovative team in the InsurTech industry, focusing on cutting-edge artificial intelligence solutions. In this exciting role, you will collaborate with experienced developers to design, implement, and maintain web applications that enhance customer experiences and streamline processes.

Who We Are Looking ForWe are in search of dedicated team members (m/w/d) who value collaboration, appreciation, and creativity just as much as competitive compensation, top-notch technical equipment, and significant creative freedom.What Awaits YouCollaborate with your team on exciting and diverse projects in the eCommerce sector, utilizing Shopware within an agile project environment.Translate unique customer requirements into effective solutions.Make daily decisions on the best methods for implementing these requirements.Ensure high-quality outcomes by developing shops that customers love.Leverage your experiences to support our continuous improvement of processes and methodologies.Share our passion for the mission: 'To shape companies for the future of commerce.'

Location: Remote / Berlin (Office available) | Language Requirement: Fluent GermanAt Deepslate, we are revolutionizing the field of communication by developing Speech to Speech Voice AI models that are indistinguishable from human voices.While giants like OpenAI and Google have made strides in text and imagery, and companies like Veo3 and Sora are rapidly advancing in video, the complexities of voice—encompassing its myriad languages, dialects, accents, intonations, and melodies—remain largely unsolved. This is the frontier we are tackling at Deepslate.With support from leading investors in the tech and AI sectors, as well as a prominent German VC fund, we are well-capitalized and moving swiftly to build the future of communication.Rather than creating another standalone platform, we aim to be the intelligence engine that powers numerous applications. Our technology can be integrated into existing Voice AI platforms or embedded directly into enterprise systems through our partners.Your RoleYour mission will be to design, scale, and fortify the backbone of our infrastructure.You will oversee everything from user management and agent systems to performance optimization and observability, laying the groundwork for future developments.What You'll Do:Help scale Deepslate and enhance accessibility for users worldwide:Architect & Implement: Design and develop innovative backend features by enhancing our core API framework.Scalability: Construct and expand infrastructure capable of handling thousands of simultaneous calls seamlessly.Reliability-First: Write robust, consistent code; prioritize advanced error handling and idempotency.Production Ownership: Diagnose and resolve live production issues, and create systems that prevent future occurrences.Elevate Our Engineering Quality:Tooling & DevEx: Develop internal tools that enhance developer experience and implementation efficiency.