Senior Java Developer - Third Party Ecosystem (All Genders)

Hello and welcome! Are you ready to take on an exciting career challenge or just browsing your options? You’re in the right place!We are on the hunt for a skilled Senior Backend Developer to become part of our dynamic team. In this position, you will play a pivotal role in advancing our Hospitality product group, supporting our ambition to penetrate new markets and enhance our extensive commerce platform.This particular role focuses on developing a sophisticated, modular framework for users and permissions. You will engage in a broad spectrum of projects that significantly influence the daily experiences of countless customers worldwide, contributing to the vitality of local communities.Join us in reshaping the landscape of hospitality technology!Your Responsibilities:Collaborate with some of the brightest minds in the industry to enhance our omnichannel product by developing innovative features and workflows.Expand our product capabilities by contributing to our AWS-hosted, microservice-based platform.Balance the creation of new features with the maintenance of existing integrations, prioritizing feature development as we explore new markets.Report to the Development Team Lead, fostering strong collaboration with Product Managers, Product Designers, and Platform Teams.Engage in daily agile ceremonies, sparking innovation that challenges conventions and implements solution-driven ideas.Promote high standards of code quality and accountability, actively contributing to the health of our infrastructure.Encourage team growth by sharing knowledge and best practices while continually pursuing personal and professional development.Explore our Tech Stack here.Your Qualifications:Exceptional Java expertise with over 5 years of production experience.Proficient in the Spring framework.Strong grasp of object-oriented programming and design patterns.Experience with RESTful APIs, microservices architecture, and cloud technologies.

Hello! We appreciate your interest in our team! Are you ready to embrace a new career challenge, or are you simply exploring opportunities? If so, you have come to the right place! We are on the lookout for a skilled Senior Backend Developer to join our dynamic team. In this pivotal role, you will contribute to the growth and advancement of our Hospitality product group, helping us to penetrate new markets and enhance our all-encompassing commerce platform. You will specifically be part of the team dedicated to developing a sophisticated, modular framework for user and permissions management. Your work on a range of projects will significantly affect the everyday experiences of thousands of customers globally and aid in revitalizing local communities. Join us as we shape the future of hospitality technology!

Join our innovative team at Lightspeed Commerce Inc. as a Senior Software Developer specializing in Java. In this pivotal role, you will work on our Third Party Ecosystem, contributing to the development of cutting-edge software solutions that enhance our platform's connectivity and flexibility.As a Senior Software Developer, your expertise will guide our projects, ensuring high-quality code and efficient workflows. Collaborate with a talented team of developers and stakeholders to drive our technology forward, fostering an environment of continuous improvement and excellence.

Join our innovative team at SWARCO as a Senior Java Developer in Berlin. In this pivotal role, you will be responsible for designing, developing, and maintaining high-quality software solutions that drive our projects forward. Your expertise in Java programming will be crucial in crafting robust applications that meet the needs of our clients.

KAYAK, part of Booking Holdings (NASDAQ: BKNG), runs a large-scale travel search platform used by travelers worldwide to find flights, hotels, rental cars, and vacation packages. The company also offers KAYAK for Business, which provides travel management solutions to organizations. Its network includes well-known brands like momondo, Cheapflights, and HotelsCombined. KAYAK aims to make exploring the world easier by building the best travel search engine and values innovation and real impact from its employees. Role overview As a Senior Java Software Engineer based in the Berlin office, you will play a key role in developing and refining the features behind KAYAK’s search and booking systems. The team collaborates with over 200 travel partners, giving users access to more than 500,000 hotels and 550 airlines. Your work will help ensure smooth, reliable experiences for millions of users each day. This position requires onsite presence in Berlin at least three days per week. What you will do Enhance search and booking algorithms to meet the needs of major corporate clients worldwide. Develop and maintain high-performance integrations with third-party APIs, including those for airlines, hotels, and rental car providers. Take ownership of your designs from concept through deployment, with a focus on code quality and system performance. Join code reviews and architectural discussions to keep the K4B project modular and reusable as KAYAK continues to grow. Requirements Bachelor’s degree in Computer Science or a related field. At least 4 years of professional experience working with Java. Strong knowledge of the Spring ecosystem (Spring/Spring Boot) and hands-on experience with both relational (SQL) and NoSQL databases such as PostgreSQL, MySQL, or Redis. Clear and effective communication skills in English. Ability to independently design and deliver engineering projects.

Join the dynamic team at moia as a Senior Software Update Compliance Specialist. In this pivotal role, you will oversee the compliance of software updates across our platforms, ensuring that all updates meet regulatory requirements. Your expertise will contribute to maintaining our commitment to delivering high-quality services to our customers.

About KAYAKKAYAK, a member of Booking Holdings (NASDAQ: BKNG), stands as a premier travel search engine. With billions of queries on our platforms, we assist travelers in discovering their ideal flights, accommodations, rental cars, and vacation packages. We are also revolutionizing business travel with our innovative corporate travel solution, KAYAK for Business.As part of KAYAK, you will join a travel company that oversees a diverse array of global metasearch brands, including momondo, Cheapflights, and HotelsCombined. From our startup journey to becoming an industry trailblazer, innovation drives us, and every team member has the chance to leave a lasting impact. Our commitment is to develop the most efficient travel search engine, simplifying the process for everyone to explore the world.Position OverviewWe are in search of a proficient mid-level Java backend developer dedicated to implementing new features and maintaining KAYAK’s cutting-edge search and booking technology. Collaborating with over 200 travel partners and connecting to more than 500,000 hotels and 550 airlines, you will play a pivotal role in a dynamic team that ensures seamless operations, aiding millions in finding optimal accommodations and travel routes every day!This is a Fixed Term contract until September 30, 2027.This role requires working from our Berlin office a minimum of three days per week.Key ResponsibilitiesEnhance search and booking algorithms to meet the needs of our largest global corporate clients.Develop and sustain high-performance integrations with third-party APIs (airlines, hotels, and rental car providers).Take full ownership of your designs, from concept to deployment, while upholding exceptional standards for code quality and performance.Engage in code reviews and architectural direction to ensure the K4B project remains modular and reusable as KAYAK expands its enterprise reach.QualificationsBachelor’s degree or higher in Computer Science or a related field.5+ years of experience in Java programming.Hands-on experience with the Spring ecosystem (Spring/Spring Boot) and familiarity with relational (SQL) and NoSQL databases (e.g., PostgreSQL, MySQL, Redis).Excellent English communication skills.Ability to design and implement engineering initiatives with a focus on performance and usability.

Join Our Innovative Team at 1GLOBALAt 1GLOBAL, we are redefining mobile connectivity on a global scale. As a leading technology-driven mobile communications provider, we deliver seamless connectivity solutions for both enterprises and consumers. Our advanced telecom platform, featuring our proprietary global mobile core network and in-house developed eSIM technology, empowers us to operate as a fully regulated telecommunications provider across 40 countries worldwide.We partner with some of the world’s premier banks, enterprises, and digital-first businesses, including neo-banks and global consumer goods companies. With over 70 million connections, we enable our clients to innovate and scale their operations confidently within the mobile ecosystem.As a profitable and rapidly growing business, we project revenues exceeding US$200 million in 2025, with profits surpassing US$25 million. Our strong cash flow allows us to invest continuously in our infrastructure, platform innovations, and global expansion initiatives. Our recent successes have marked a pivotal phase in our journey, with significant client acquisitions propelling us into a global mobile connectivity powerhouse.Founded in 2022 by seasoned tech entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL is quickly emerging as a European technology leader, committed to shaping the future of global telecommunications. As a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and a regulated telecom operator in another 28, we are headquartered in the Netherlands with R&D hubs in Lisbon, Berlin, and São Paulo. Our dedicated team of nearly 500 experts across 15 countries is driven by a singular ambition: to enhance global mobile connectivity through innovative technology and operational excellence.About the RoleDesign and develop impactful features while contributing to the architectural framework with a focus on resilience, scalability, security, and fault tolerance.Champion high code quality and best practices to maintain robust software development.Work collaboratively in an agile team environment to ensure timely product delivery and management.

Become part of our dynamic team as a Scala Software Engineer (all genders) within our Payment division, contributing to a mission that truly matters! Our Payment team is committed to delivering a seamless and secure payment experience for our users. You will collaborate with a talented cross-functional team that shares a strong passion for developing innovative software solutions that not only serve our existing customers but also provide immense scalability. To reach our ambitious objectives, we are looking for someone who is eager to contribute their skills and grow with us.

Join our innovative team at redcare-pharmacy as a Senior Java Engineer. In this pivotal role, you will leverage your expertise in Java programming to develop robust, scalable applications that enhance our digital pharmacy solutions. Collaborate with cross-functional teams to drive the design and implementation of high-quality software solutions.We are looking for a proactive and detail-oriented engineer who thrives in a dynamic environment and is passionate about problem-solving. If you are ready to make a significant impact in the healthcare technology space, we want to hear from you!

About the Role scalablegmbh is looking for a Senior Kotlin / Java Software Engineer focused on Application Framework development in Berlin. This position centers on designing and building scalable applications that support core business functions. The work directly influences our technology choices and strengthens the software we deliver.

About Us Join our dynamic international team at Doctolib, based in Berlin, where we are devoted to enhancing the performance, features, and design of our essential healthcare product, the Scheduling System. Over the past decade, Doctolib has experienced remarkable growth by prioritizing pragmatic solutions and avoiding unnecessary optimizations. To sustain our momentum, we are focusing on performance as a key priority and are continuously evolving the architecture of our core features to accommodate future demands. We are currently re-engineering our Appointments Management Service from the ground up, utilizing modern event-driven, distributed technologies in line with our updated technology strategy. This pivotal service will revolutionize the way Care Teams manage appointments, ensuring patients receive quicker access to care.

ABOUT YOU GmbH seeks a Senior Backend Engineer to advance its Business Intelligence Application. This role is open in either Hamburg or Berlin. Key responsibilities Build and maintain backend systems that enable data-driven decisions throughout the company. Collaborate with teams across the organization to enhance performance, scalability, and reliability of the application. Apply backend engineering expertise to influence the development of Business Intelligence tools. Location This position is available in Hamburg or Berlin.

Superhuman embraces a vibrant hybrid working model, offering team members the perfect blend of focused work time and in-person collaboration, fostering trust, innovation, and a robust team culture.About SuperhumanGrammarly is now a part of Superhuman, an AI productivity platform dedicated to unlocking the superhuman potential within everyone. The Superhuman suite of applications and agents integrates with over 1 million tools and websites, bringing AI capabilities directly to users. Our product range includes Grammarly’s writing assistance, Coda’s collaborative workspaces, Mail’s inbox management, and Go, an AI assistant that intuitively understands context and provides automated help. Since our inception in 2009, Superhuman has empowered over 40 million individuals, 50,000 organizations, and 3,000 educational institutions around the globe, enabling them to eliminate busywork and concentrate on what truly matters. Discover more about us at superhuman.com and our values here.The OpportunityAt Superhuman, we are redefining communication and productivity through trusted AI. We are looking for a Senior User Researcher to join our impactful UX and Marketing Research team. In this critical role, you will spearhead research initiatives for our innovative Agents team, playing a key role in shaping the development and strategic vision of products designed to enhance productivity for professionals and students alike.In this position, you will collaborate closely with cross-functional teams—Product, Design, Data Science, and Marketing—to pinpoint essential business inquiries, employ rigorous methodological approaches, and distill insights that guide strategic decisions. By utilizing various research techniques, you'll uncover actionable insights about current and prospective Superhuman users, while promoting a culture of human-centered, data-driven decision-making that propels our evolution as leaders in AI-assisted communication.

GetYourGuide helps travelers find and book memorable experiences in thousands of cities worldwide. The company has operated since 2009 and now includes a global team of more than 850 people, with headquarters in Berlin and 16 local offices. More details about the team and culture are available on the careers page. This Senior Software Engineer position sits within the Developer Enablement Team in Berlin. The focus is on building and maintaining internal tools and platforms that make engineering teams more productive. The role centers on backend development and aims to streamline workflows, automate processes, and improve the experience of developers across the company. What you will do Maintain CI/CD pipelines: Enhance and support continuous integration and deployment workflows using GitHub Actions and ArgoCD to ensure reliable delivery of services. Manage GitHub access: Oversee repository permissions and workflows, enabling secure and effective collaboration across teams. Improve testing tools: Build and maintain automated testing solutions for Java, JavaScript, and Python projects to help strengthen code quality. Enhance local development: Develop tools that make local development environments faster and more consistent, especially for testing purposes. Enable AI-assisted engineering: Contribute to the evolution of in-house AI agents and support the adoption of AI tools within engineering teams. Support diverse engineers: Collaborate with developers working in various programming languages to create cross-language tooling that improves productivity. Contribute pragmatically: Write clean, maintainable code for backend systems and internal developer tools.

Join idealo’s Clickout-to-Revenue team in Berlin, where the focus is on building and maintaining systems that help retailers monetize qualified referrals. The team’s work has a direct impact on idealo’s growth by ensuring monetization processes remain reliable and efficient. Both full-time and part-time arrangements are possible for this Senior Software Engineer position. What you will do Design, develop, and operate business and web applications on AWS Cloud. Take responsibility for the full lifecycle: architecture, infrastructure, development, testing, security, deployment, monitoring, and maintenance. Build and maintain services that handle processing and billing, integrating with key systems such as Odoo ERP and connecting to Salesforce and SAP. Work closely with colleagues from accounting, sales, account management, and other engineering teams to deliver solutions that meet changing business needs. Identify and implement process improvements, maintain high code quality, and pursue ongoing professional growth with support from idealo. Tech stack Kotlin Java AWS Odoo ERP Salesforce and SAP interfaces Location This role is based in Berlin, Germany.

Your Career Opportunity (starting from 01.05.2026)Are you passionate about creating user-centered product experiences that make a real impact? Do you think from the initial sketch to the final interface and enjoy transforming complex problems into elegant solutions? If so, HERO is the perfect place for you – here, you will shape the future of digitalization in the crafts sector!Your Mission Discovery & Research: Identify problems and opportunities with a focus on genuine user needs and the highest product quality. Data-Driven Design: Integrate relevant data into your design decisions and measure the success of your solutions. Prototyping & Testing: Bring your ideas to life through prototypes and validate them in targeted user tests. Product Design Excellence: Develop thoughtful solutions from the first sketch to the final interface, advance our design system, and introduce new design trends, methods, and AI tools to the team. Cross-Functional Collaboration: Work closely in the Product Trio with Product Management and Engineering and actively engage with Research, Analytics, and Brand.

Join our dynamic team at ABOUT YOU GmbH as a Backend Engineer specializing in recommendations. In this role, you will develop innovative solutions to enhance user experience through personalized recommendations. You will collaborate with cross-functional teams to design, implement, and optimize backend services that support our recommendation algorithms.

Join Atolls, the world's largest community-driven shopping platform, active in over 20 markets.We empower millions to make informed spending choices across the discovery, evaluation, and (re-)purchase phases by connecting consumers with the right brands and retailers.Our diverse team of over 1,000 individuals across 10 countries develops products that millions use daily at a global scale. Here, you'll have true ownership of your work and witness its direct impact. Are you ready to help shape the shopping experiences that people trust? Keep reading.About This Opportunity:We are on the lookout for a Senior Software Engineer (Java/SpringBoot) to enhance our Shopping team based in Berlin. In this pivotal role at Atolls, you will play a critical part in enabling our consumers to maximize their value for money by delivering an outstanding shopping rewards experience online and in-store. You'll be instrumental in crafting exceptional user experiences, empowering consumers to make informed and confident shopping decisions. Your contributions will directly influence how millions of users engage with our platforms, guiding them towards making smart, fair, and rewarding choices.Our Perks:At Atolls, we are committed to fostering your professional and personal development. Here’s what we offer:A culture that champions personal and professional growth, coupled with internal mobility opportunities.A supportive and inclusive team that values diverse perspectives and innovative ideas.32 days of paid vacation plus your birthday off for optimal work-life balance.A flexible hybrid working model to accommodate your lifestyle.Access to a dedicated learning budget and internal training.Mental health coaching to support your well-being.Regular global and local events to celebrate achievements and foster connections.Opportunity for a sabbatical after three years with the company.