(Junior) Full-Stack Developer (m/f/d) in AI & Digital Innovation Travel

CHECK24Leipzig

On-site Full-time

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Experience Level

Entry Level

Qualifications

Proficiency in JavaScript, HTML, CSS, and modern frameworks (e.g., React, Angular). Familiarity with backend technologies such as Node.js and databases (SQL or NoSQL). Understanding of DevOps practices and tools. A passion for technology and eagerness to learn in a fast-paced environment. Strong analytical and problem-solving skills.

About the job

Join CHECK24 as a Junior Full-Stack Developer (m/f/d) where you will play a crucial role in shaping AI and digital innovations. In this exciting position, you will collaborate with our talented team to design, develop, and enhance our applications and web platforms, ensuring a seamless user experience.

About CHECK24

CHECK24 is a leading online comparison portal in Germany, dedicated to helping customers find the best deals. Our innovative approach and commitment to digital transformation position us at the forefront of the tech industry. Join us in driving the future of digital innovation!

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Full-Stack Developer - AI Trainer

Anyone AI

Contract|Remote|Germany

Anyone AI is seeking talented Full-Stack Developers to join an innovative project collaborating with a prestigious AI lab.Qualifications:Fluent written and spoken English at an advanced professional level.3 to 7 years of hands-on software engineering experience.Expertise in Python along with strong skills in JavaScript or TypeScript; familiarity with Java, C…

May 4, 2026

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Full-Stack Developer - AI Trainer Position in Germany

Anyone AI

Part-time|Remote|Germany

Join Anyone AI as a talented Full-Stack Developer and collaborate on groundbreaking projects with a premier AI laboratory.Qualifications:Fluent in professional written English3 to 7 years of hands-on experience in software engineeringExpertise in Python and JavaScript/TypeScript, with familiarity in Java, C#, or GoExperience in backend or full-stack development within production environmentsFamiliarity with testing frameworks such as pytest, Jest, JUnit, xUnit, and Go testingProven track record of debugging and navigating extensive codebasesExperience in code reviews, refactoring, and production migrationsEngagement: This is a part-time, project-based consultancy role.Work Type: RemoteAs a contributor, you will design and evaluate authentic software engineering tasks, focusing on bug fixing, feature development, refactoring, and test generation. Your role involves crafting intricate coding scenarios and assessing peer submissions for quality and precision.Responsibilities:Create and implement multi-file coding tasks for bug fixes, feature enhancements, refactoring, and testingProduce clear, natural-language specifications and reference implementationsExpand and maintain unit and integration test suitesReview tasks generated by peers for correctness, clarity, and realismIdentify edge cases, ambiguities, and potential failure scenariosEnsure that specifications, code, and expected outputs are alignedExpected Outcomes:Deliver high-quality, production-ready coding tasks

Apr 6, 2026

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Backend Developer - AI Trainer

anyone-ai

Full-time|On-site|Germany

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.

Apr 13, 2026

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Full Stack Developer - Join Our AI Team

think-cell Software GmbH

Full-time|On-site|Berlin

About The RoleAt think-cell, we are dedicated to revolutionizing the way professionals create impactful business presentations. By integrating advanced automation and assistance features, we enhance our product to serve over 1.3 million users globally. In this exciting role, you will transform innovative ideas and cutting-edge AI concepts into robust features that redefine user experience.Your responsibilities will include developing production-ready systems that seamlessly connect modern backend services with user-friendly interfaces. Collaborating closely with C++ engineers on our core product and AI engineers pushing the boundaries of automation, you will play a pivotal role in bringing new functionalities from concept to everyday use.This position is perfect for engineers who take pride in crafting clean, scalable systems, prioritize code quality, and thrive in a collaborative environment where impactful features are regularly delivered.

Mar 16, 2026

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Full-Stack Developer (m/f/d) – AI & Digital Innovation Explorer

CHECK24

Full-time|On-site|Erfurt

Join our dynamic team at CHECK24 as a Full-Stack Developer (m/f/d) focused on AI and Digital Innovation. In this role, you will be at the forefront of developing cutting-edge applications that drive our digital transformation efforts. You will collaborate closely with cross-functional teams to create user-friendly and efficient solutions that enhance customer experiences.

Apr 9, 2026

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Full-Stack Developer (m/w/d) – AI & Digital Innovation Explorer

check24

Full-time|On-site|Erfurt

Role Overview check24 is looking for a Full-Stack Developer (m/w/d) to help shape AI and digital innovation projects. This position sits within the App & Web Full Stack team in Erfurt. The work centers on building and improving applications that make user experiences smoother and support efficient business operations.

Apr 14, 2026

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(Junior) Full-Stack Developer (m/f/d) in AI & Digital Innovation Travel

CHECK24

Full-time|On-site|Leipzig

Apr 14, 2026

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Senior Full Stack Developer (m/w/d) at TechBiz Global | Berlin

TechBiz Global

Full-time|On-site|Berlin, Berlin, Germany

At TechBiz Global, we pride ourselves on being more than just a recruitment and software development agency; we are a dedicated German-based global partner focused on driving your business success. Our diverse and distributed team specializes in IT recruitment, outstaffing, outsourcing, software development, and consulting services, catering to over 100 clients across more than 20 countries. We are currently in search of a Senior Full Stack Developer to join one of our esteemed client's teams. If you are looking for an exhilarating opportunity to advance your career in an innovative environment, this role may be the perfect match for you.

Feb 13, 2025

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Backend Developer – AI Trainer in Germany

Anyone AI

Part-time|Remote|Germany

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.

Apr 29, 2026

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Full Stack Developer at bitlane | Berlin

Bitlane

Full-time|On-site|Berlin

We are seeking a passionate Full Stack Developer to join our dynamic team at bitlane in Berlin. In this role, you will engage in the complete product development lifecycle, from brainstorming innovative ideas to deploying and maintaining our applications. The ideal candidate will possess a solid foundation in software engineering principles and best practices, coupled with a creative mindset to solve complex problems and develop new services. Your responsibilities will include both back-end and front-end development across various projects, collaborating with our international team to enhance different layers of our applications. Projects may range from simple applications to comprehensive e-commerce systems and sophisticated CRM platforms. If this resonates with your skills and aspirations, we invite you to apply!Responsibilities:Work closely with our software team to conceptualize and implement new features.Enhance our product and codebase using your analytical expertise.Expand and innovate our existing web technology offerings.Develop and maintain tools for software and data interaction.Champion test-driven development practices, including code reviews, unit testing, and documentation.Collaborate with project managers to define project scopes.Effectively communicate your progress and adhere to deadlines established with project managers.

Aug 17, 2020

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Full Stack Developer at sereact | Stuttgart

sereact

Full-time|On-site|Stuttgart Schockenriedstr. 17

About Us:At sereact, we are pioneers in building intelligent robotic systems that can perceive, reason, and act in real-world environments. Our innovative technology bridges the automation gaps that conventional systems cannot address, revolutionizing the execution of physical tasks in industrial settings such as warehouses and factories. Join us in our mission to transform the future of robotics.Position Overview:We are on the lookout for a skilled Full Stack Developer to architect and implement robust software solutions for our robotics platforms. This role involves working across the entire software stack to create user-friendly interfaces, scalable backend services, and seamless integrations that empower users to monitor, control, and optimize robotic systems.Key Responsibilities:Design:Create, develop, and sustain web applications for the monitoring and control of robotic systems.Develop secure and scalable backend services that facilitate real-time robotic operations.Implement dynamic dashboards and visualization tools to effectively present robotic performance data.Optimize:Collaborate closely with robotics engineers to grasp system requirements and workflows.Work with frontend and backend teams to ensure smooth integration throughout the software stack.Engage in system architecture discussions and contribute to design decisions.Enhance application performance for real-time responsiveness and scalability.Troubleshoot and rectify issues across both frontend and backend systems.Uphold code quality, maintainability, and security through best practices and code reviews.

Feb 5, 2026

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Full-Stack Software Engineer

Superhuman

Full-time|Hybrid|Hub - Berlin

At Superhuman, we value a dynamic hybrid working model that combines focused individual work with in-person collaboration. This flexible environment fosters trust, innovation, and a robust team culture.About SuperhumanSuperhuman is an advanced AI productivity platform, now incorporating Grammarly, focused on unlocking the superhuman potential in everyone. Our suite of applications and agents integrates with over 1 million tools, enhancing productivity wherever you work. With products like Grammarly's writing assistance, Coda's collaborative workspaces, and Go, our proactive AI assistant, we empower over 40 million users and thousands of organizations and educational institutions worldwide to eliminate busywork. Discover more at superhuman.com.The OpportunityWe are on the lookout for talented Full-Stack Software Engineers to join our engineering teams and help us achieve our ambitious goals. In this role, you will be instrumental in developing core components of the Superhuman product suite, enhancing our infrastructure and features to assist millions of users in writing more clearly and effectively. You will work across both Front-End and Back-End, contributing to high-impact projects that are visible to our user base.At Superhuman, engineers and researchers have the freedom to innovate and shape our product roadmap. As we scale our interfaces, algorithms, and infrastructure, you will face increasingly complex technical challenges. You can learn more about our engineering efforts on our technical blog.Superhuman is rapidly expanding, presenting opportunities to join a growing team, learn from experienced peers, and contribute to building product offerings from the ground up. Within our vibrant engineering organization, you will find ample room for ownership and a direct impact on users.As a Full-Stack Engineer, you will:Commence building and pushing code within your first week, delivering impactful features in your initial months.Develop and maintain production services with high call rates on the Back-End while creating rich user interfaces on the Front-End.Aim for high availability for both consumer and enterprise customers.

Feb 20, 2026

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Senior Full Stack Developer (d/m/w) - Remote at haufegroup

haufegroup

Full-time|Remote|Freiburg im Breisgau

Join haufegroup as a Senior Full Stack Developer and play a key role in shaping our innovative software solutions. In this fully remote position, you will collaborate with a dynamic team of developers, designers, and stakeholders to deliver high-quality applications that meet our clients' needs.

Jan 28, 2026

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Senior Full Stack Developer

cosmos

Full-time|On-site|Darmstadt

About cosmosAt cosmos, we are revolutionizing the way organizations align their strategic goals with operational realities. Our mission is to transform conventional strategy into a dynamic, real-time control system that enables decision-makers to visualize the impact of their actions as conditions evolve.Unlike typical project management tools, cosmos™ serves as the backbone of organizational thinking, decision-making, and execution, bridging the gap between strategic planning and real-world implementation.The RoleJoin a compact yet powerful engineering team where your contributions directly impact our customers by solving critical strategic challenges. You will be responsible for developing essential features of the cosmos product, overseeing the entire process from concept to customer delivery, while enhancing the technical prowess of your peers.We value problem solvers who embrace ownership and responsibility, and who elevate the standards of their colleagues. Your work will play a key role in our overarching goal to operationalize strategy.What You Will DoDevelop vital product functionalities using high-quality, maintainable code with our technology stack: Typescript, React, PHP, Symfony.Take ownership of features from initial design and implementation to deployment, monitoring, and adapting based on user feedback.Lead architectural discussions that align immediate project needs with long-term scalability and maintainability goals.Address technical challenges, debug production issues, assess performance concerns, and make informed architectural choices balancing speed with maintainability.Conduct code reviews, implement best practices, and promote continuous integration and automated testing within the team.Mentor colleagues in AI integration and coding best practices.Collaborate with cross-functional teams, including product management, design, and engineering, to deliver integrated solutions that address genuine customer needs.About You5+ years of software engineering experience with proven technical expertise.You work independently while also thriving in team environments.Proficient in modern software development practices and tools.

Feb 18, 2026

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Senior Full Stack Engineer

jobgether

Full-time|On-site|Germany

jobgether is looking for a Senior Full Stack Engineer based in Germany. This position centers on building and maintaining applications that support both the front end and back end of our platform. Role overview The Senior Full Stack Engineer will work with multiple teams to design, implement, and support scalable solutions. The focus is on improving user experience and strengthening product functionality. Day-to-day, this means developing features, solving technical challenges, and ensuring our applications run smoothly. Collaboration Expect close collaboration with colleagues from various disciplines. Input and ideas will help shape product direction and service quality. Contributions in this role play a key part in the company’s growth and the ongoing improvement of our offerings.

Apr 29, 2026

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Lead Staff Full-Stack Engineer at Bluefish AI | Berlin, Germany

bluefishai

Full-time|Remote|Berlin, Remote in Germany

About the PositionJoin our dynamic team as a Staff Full-Stack Engineer where your expertise will play a pivotal role at the intersection of product development, infrastructure, and AI-powered solutions. In this influential position, you will spearhead the architecture and continuous improvement of scalable web applications, contributing significantly to the foundation of Bluefish's AI marketing platform.Your collaboration will span multiple teams, working closely with AI engineers, product managers, designers, and infrastructure specialists to convert abstract product concepts into robust and scalable systems. Beyond just feature development, you will define architectural patterns, steer technical direction, and make certain that engineering decisions align with our company’s growth trajectory.We seek an individual with a strong focus on product and system thinking, dedicated to delivering sustainable solutions and creating measurable impacts for our customers.As a technical leader within our engineering division, you will enhance engineering practices across teams by leading design reviews, mentoring senior engineers, and establishing standards that facilitate rapid progress while ensuring reliability and quality.This role provides the chance to shape the architecture of core systems, influence the overall technical strategy of the company, and define how AI-assisted development will drive the future of marketing technology.Note: This role is primarily associated with our office in Berlin, but we offer remote work options within Germany.

Mar 17, 2026

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PHP or Full-Stack Software Developer (m/f/d)

talentdiepersonalfinder

Full-time|On-site|Willich, Nordrhein-Westfalen, Deutschland

As a dynamic technology company, our client specializes in the development and manufacturing of electromechanical assemblies, custom components, and high-quality HMI solutions for sectors such as Automotive, Medical Technology, and Industrial Automation. Located in Willich, North Rhine-Westphalia, the company benefits from an excellent geographical position in the Rhine-Ruhr metropolitan region, just a short drive from Düsseldorf.We are currently seeking a dedicated PHP or Full-Stack Software Developer (m/f/d) to join our team on a full-time basis. You will play a pivotal role in advancing existing AI solutions, identifying suitable use cases, developing high-performance models, and integrating them into our systems. If you are excited about this opportunity and possess the necessary qualifications, we would love to hear from you!Your Responsibilities:Develop AI-driven solutions that automate internal processes, enhance data usability, and streamline workflows. Identify meaningful application areas for AI and Data Analytics and turn them into concrete applications.Create high-performance applications and functionalities.Design microservices and interfaces.

Dec 10, 2025

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Senior Full-Stack Engineer

Jimdo GmbH

Full-time|Remote|Germany

Join Us at Jimdo - Empowering the Self-EmployedAt Jimdo, we are dedicated to unleashing the potential of solopreneurs and micro-businesses. Our platform simplifies the complexities of building successful businesses, allowing our users to focus on what they are passionate about.Founded in 2007 by three friends in Northern Germany, Jimdo has evolved into a profitable, remote-first company with over 220 professionals from more than 50 nationalities across 15 countries. We've empowered over 36 million users to establish their online presence.We are not just a website builder; we are an AI-driven platform that supports the self-employed in running their businesses efficiently—from improving online visibility to acquiring customers and handling daily operations with confidence.Central to our mission is our commitment to personalized, data-driven guidance. Our platform integrates design, business tools, and AI capabilities to transform real customer data into actionable insights, enabling our clients to focus on what propels their businesses forward.Your Role:As part of a dynamic team of expert engineers, you will play a pivotal role in enabling Jimdo’s business and engineering teams to deliver impactful results swiftly across our product offerings. Reporting to the Head of Architecture, you will be a senior full-stack developer who takes ownership of projects from front-end to back-end and infrastructure, driving them to completion.Your work will involve navigating diverse domains and codebases, addressing critical needs as they arise rather than adhering to a fixed long-term project. You will tackle both straightforward and complex tasks using modern technologies, including AI-assisted development, ensuring rapid progress without sacrificing quality. Your extensive engineering background, combined with a flexible mindset, will help us achieve faster outcomes while collaborating closely with staff engineers and product teams. This role is perfect for those who value autonomy, relish variety, and enjoy system-level thinking, working collaboratively to deliver impactful results.Your Contributions:Design and develop scalable APIs, services, and user interfaces.Adapt quickly to different codebases, comprehending context and resolving critical challenges.Deliver high-quality, maintainable code that meets our rigorous standards.

Jan 23, 2026

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Lead Principal Full Stack Developer (TypeScript)

cosuno

Full-time|Remote|Berlin/Remote

Your MissionAs a Principal Full Stack Developer at cosuno, you will take on the pivotal role of a technical leader, influencing the evolution of our platform while mentoring fellow engineers. You will tackle complex technical challenges, ensuring our systems are scalable, reliable, and future-proof.Your responsibilities will include:Driving the technical vision and architecture of our core product, collaborating closely with our Machine Learning team to seamlessly integrate innovative AI features.Leading the design and implementation of extensive technical projects, such as advancing our monorepo strategy and migrating critical services to new architectures.Mentoring senior engineers to enhance their skills through code reviews, architectural guidance, and the establishment of best practices.Collaborating with product and engineering leadership to identify and mitigate technical risks in the product roadmap for the upcoming 1-2 years.Our Engineering CultureAt cosuno, we foster a calm, collaborative, and productive engineering environment. We empower our engineers with the autonomy to excel. Our approach includes:Agile & Fast-Paced: We engage in trunk-based development with daily releases to deliver value to our users promptly.Quality by Default: We uphold a rigorous Cypress E2E test suite and enforce stringent typing, linting, and formatting rules to maintain a clean and maintainable codebase.DevOps Mindset: Our CI/CD pipeline, which deploys to AWS via Kubernetes, is managed as code using Terraform.Collaboration & Transparency: We value open discussions, constructive code reviews, and a culture where the best idea prevails, regardless of its source.

Mar 1, 2026

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Full-Stack Developer (m/w/d)

dampsoftberlin

Full-time|On-site|Berlin

Join our innovative team at dampsoftberlin, where we are seeking a dynamic Full-Stack Developer (m/w/d) to contribute to our exciting projects. As a key player in our development team, you will work on both front-end and back-end technologies, crafting seamless user experiences and robust server-side applications.If you are passionate about coding and eager to learn, we encourage you to apply!

Sep 25, 2018

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