Lead Software Architect (Java) at KAYAK | Berlin

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.

About Us1GLOBAL is a pioneering global mobile communications provider, dedicated to delivering innovative connectivity solutions for both enterprises and consumers. With a cutting-edge telecom platform that includes our proprietary global mobile core network, advanced in-house developed eSIM technology, and a comprehensive array of telecom licenses, 1GLOBAL operates as a fully regulated telecommunications provider across 40 countries.We proudly serve leading banks, enterprises, and digital-first businesses, including neo-banks, fast-moving consumer goods firms, travel industry leaders, and payment service providers. Currently, 1GLOBAL connects over 70 million individuals and devices worldwide, empowering our clients to confidently launch, scale, and innovate within the mobile ecosystem.1GLOBAL is a profitable and rapidly expanding enterprise, with projected full-year revenues surpassing US$200 million and profits exceeding US$25 million in 2025. Our strong cash flow allows us to continually invest in infrastructure, platform innovation, and global expansion. Recent years have marked a transformative phase in our journey, with significant enterprise and mass-consumer client acquisitions propelling our evolution into a dominant force in global mobile connectivity, specifically designed to support consumer brands in their telecommunications ventures.Founded in 2022 by seasoned tech entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL has swiftly established itself as a European technology leader reshaping the future of global telecommunications. As a regulated Mobile Virtual Network Operator (MVNO) in 12 countries and a telecom operator in an additional 28 markets, we are headquartered in the Netherlands with exceptional R&D centers located in Lisbon, Berlin, and São Paulo. Our team of nearly 500 experts across 15 countries is united by a singular goal: to redefine global mobile connectivity through technology, scale, and execution excellence.About the TeamWe are seeking a skilled and experienced engineering leader to join our newly formed team. You will collaborate with an international group, spearheading the development of 1GLOBAL's eSIM platform, which encompasses both consumer and IoT solutions. We value teamwork and foster a culture of total ownership over our deliverables, ensuring that we are both autonomous and accountable. Our primary focus is on our customers and our commitment to building and delivering valuable propositions.Fluency in English is essential for this role; please ensure your CV is submitted in English as part of your application.

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.

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 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 Us1GLOBAL is a pioneering technology-driven mobile communications provider dedicated to delivering comprehensive global connectivity solutions for enterprises and consumers alike. Our robust telecom platform encompasses an owned and operated global mobile core network, cutting-edge in-house developed eSIM technology, and a vast array of telecom licenses. With operations across 40 countries, 1GLOBAL stands as a fully regulated telecommunications provider.We proudly serve a diverse clientele, including leading banks, enterprises, and digital-first businesses such as neo-banks, global FMCG leaders, travel companies, and payment service providers. Currently, our solutions connect over 70 million individuals and devices worldwide, empowering our clients to launch, scale, and innovate confidently within the mobile ecosystem.1GLOBAL is a profitable, rapidly growing organization, with projected revenues exceeding US$200 million and profits surpassing US$25 million by 2025. We generate substantial cash flows that facilitate our growth, allowing continuous investments in infrastructure, platform innovation, and global expansion. Recent years have marked a transformative phase in our journey, as we have achieved significant enterprise and mass-consumer client acquisitions, propelling us towards becoming a global mobile connectivity leader designed to help consumer brands successfully venture into telecommunications services.Founded in 2022 by seasoned technology entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL is rapidly establishing itself as a European technology frontrunner, shaping the future of global telecommunications. As a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and a regulated telecom operator in an additional 28 markets, we are headquartered in the Netherlands, with premier R&D hubs in Lisbon, Berlin, and São Paulo. Our team of nearly 500 experts across 15 countries is united by the mission to redefine global mobile connectivity through technological innovation, scalability, and operational excellence.About the TeamWe are on the lookout for a Strategy & Operations Manager to collaborate closely with the Chief Marketing Officer, focusing on scaling and operationalizing our B2B2C business model. In this role, you will play a central part in one of the company’s most critical growth areas, merging strategic insight with practical execution. You will ensure that partner launches, commercial initiatives, and cross-functional programs transition from concept to execution seamlessly and efficiently.Operating at the crossroads of commercial, product, finance, and legal sectors, you will adeptly translate commercial negotiations into actionable, scalable strategies that propel our business forward.

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.

Doctolib is hiring a Software Engineer with solid experience in Java and Kotlin. This position is based in Berlin and centers on building digital products that support both patients and healthcare professionals across Europe. Role overview This role involves working on software that aims to improve healthcare access and efficiency. The team values collaboration and a shared commitment to making a difference in the medical field. What you will do Collaborate with team members to design and implement new product features Develop and maintain applications using Java and Kotlin Help create solutions that make healthcare services easier to access and manage Location This role is based in Berlin, Germany.

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 Clickout-to-Revenue Team, where you'll be integral to our core business model: merchants pay for qualified redirects ("Clickouts") to their shops. Your role will ensure that this monetization operates smoothly, efficiently, and transparently, significantly contributing to idealos' growth.Your ResponsibilitiesEnd-to-End Responsibility You will develop and manage business and web applications in the AWS Cloud. Together with your team, you will oversee the entire value chain (YBYO): architecture, infrastructure, development, testing, security, deployment, monitoring, on-call duties, and maintenance. Product Focus: Monetization Processes and Services You will develop services for the representation and billing of our business models. Key components include the ERP system Odoo, internal data management tools, and interfaces to Salesforce and SAP. Innovative business models require innovative solutions; hence, you will closely collaborate with stakeholders such as our accounting, sales teams, account management, and other cross-functional engineering teams. Technical Excellence You will actively contribute ideas for process improvements, emphasize high code quality, and engage in continuous personal development – we support you with various training opportunities.

Role Overview enpal is hiring a Director of Software Engineering in Berlin. This leadership role guides the engineering team as they build new software products. The position shapes technical direction, manages project delivery, and maintains a focus on quality that serves customer needs.

About UsPerk (formerly TravelPerk) is a cutting-edge platform for travel and expense management, designed to eliminate cumbersome manual tasks that hinder productivity. Our innovative tools automate processes ranging from travel bookings to expense reporting and invoice management, allowing businesses to focus on what truly matters.With over 10,000 clients globally, including renowned brands like Wise, On Running, Breitling, and Fabletics, we are addressing the staggering $1.7 trillion issue of lost productivity, with each employee wasting an average of 7 hours each week on shadow work.Established in 2015, Perk has grown to a vibrant team of over 1,800 professionals across 12 international offices, with headquarters located in London and Boston. Our mission is to transform workplace dynamics through simplicity, innovation, and control.We are committed to our core values of ownership, delivering exceptional experiences, and teamwork. At Perk, we believe in nurturing curiosity, purpose, and the right mindset to unlock potential. Our diverse talent pool comprises leading experts from the travel and SaaS sectors, representing more than 70 countries. If you are driven to make a significant impact and enhance how millions experience work, consider joining us.Visit www.perk.com to discover more.

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.

Join Lever, a pioneering force in the recruitment software industry, as we redefine the way organizations attract and hire exceptional talent. With a client roster that includes industry giants like Netflix, Yelp, Cirque du Soleil, Shopify, and Spotify, we are on a mission to develop cutting-edge hiring solutions that empower companies to build their dream teams. Our innovative approach to talent acquisition has positioned us as leaders in our field, and we are eager to welcome passionate individuals to help us scale further. Recognized as the #1 workplace in San Francisco and among the top employers nationwide, we take immense pride in our culture and the remarkable team we have cultivated. At Lever, our employees, whom we affectionately call 'Leveroos', are our greatest asset, and we are committed to fostering a people-first environment that encourages growth and collaboration.

We are seeking a talented Software Engineer to join our dynamic team in Berlin. As a Software Engineer, you will be responsible for developing high-quality software solutions that meet our customers' needs. You will collaborate with cross-functional teams, contributing to the entire software development lifecycle.In this role, you will have the opportunity to work on innovative projects, enhance your technical skills, and grow your career in a supportive environment.

Join our innovative team at Jobs for Humanity as a Software Engineer. In this role, you will be instrumental in designing, developing, and maintaining software solutions that empower marginalized communities. Your expertise will help us create user-friendly applications that make a real difference in people's lives.

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.

Join a dynamic team at Lever, where innovation meets talent acquisition. We have been at the forefront of revolutionizing how companies recruit and hire top talent over the past eight years. Our cutting-edge hiring software is trusted by industry giants such as Netflix, Yelp, Cirque du Soleil, Shopify, and Spotify to effectively grow their teams. As leaders in the talent acquisition space, we are seeking passionate individuals to join us on our journey as we expand our innovative solutions. Proudly recognized as the #1 workplace in San Francisco and one of the top employers across the United States, we attribute our success to our incredible team, affectionately known as 'Leveroos'. We are committed to fostering a people-first culture and providing an environment where our employees can thrive. We are currently seeking a Software Engineer to help us achieve our ambitious goals.

Join our dynamic team to develop an innovative banking platform leveraging cutting-edge technologies and modern software development methodologies.Collaborate with a passionate group of software engineers and academics dedicated to revolutionizing the financial sector.Transform complex business challenges into effective technical solutions.Design and establish connections with major financial industry players to integrate Scalable Capital with the broader financial ecosystem.