Senior Software Engineer - Real-Time Ad Serving at LiveIntent

Join Zeta Global as a Senior Software Engineer specializing in Real-Time Ad Serving. In this critical role, you will be responsible for developing and optimizing our cutting-edge ad serving technologies to enhance user experience and drive engagement. Collaborate with cross-functional teams to design scalable solutions and troubleshoot complex issues in a dy…

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.

Cresta is dedicated to revolutionizing customer interactions by harnessing the immense potential of contact centers. Our innovative platform fuses advanced AI with human insight to uncover valuable customer insights, streamline communication, and enhance team efficiency. Founded by prominent figures from Stanford's AI lab, including Sebastian Thrun—the visionary behind Google X and Waymo—Cresta is led by industry experts such as CEO Ping Wu, co-founder of Google Contact Center AI, and Tim Shi, an early member of OpenAI.Our elite team comprises AI and ML specialists, strategic market leaders, and renowned investors like Andreessen Horowitz and Sequoia. We proudly serve a diverse clientele, including Intuit, Cox Communications, Hilton, and Carmax, and have been recognized by Forbes and Bain Consulting as one of the top private AI companies globally.Join us on our exciting journey to redefine the contact center landscape with cutting-edge AI solutions. The future of work is bright at Cresta!

Role Overview Delivery Hero SE is looking for a Senior Software Engineer focused on Machine Learning to join the quick commerce group in Berlin. This role centers on building and refining machine learning solutions that support and improve our rapid delivery operations. What You Will Do Design, implement, and optimize machine learning algorithms and models for quick commerce applications. Work closely with cross-functional teams to translate business needs into technical solutions. Apply machine learning expertise to boost operational efficiency and enhance customer experience. Contribute to projects that help Delivery Hero respond quickly to changing market demands. About the Team Join a group of engineers and specialists dedicated to advancing Delivery Hero’s quick commerce services. Collaboration across teams is a core part of the work, with each member’s input shaping the direction and impact of our products.

About coretylyntcoretylynt is revolutionizing the industrial supply chain with an innovative AI-powered trading platform that facilitates seamless connections between vetted suppliers across Asia, Europe, and the GCC region and local demand. Our integrated platform digitizes and automates the entire lifecycle of materials trade, optimizing processes from procurement and pricing to inventory management, logistics, and embedded financing. This automation replaces thousands of manual, relationship-driven tasks, enabling real-time orchestration of supply chains.Our platform provides buyers with instant quotes, dependable availability, and predictable delivery through a unified operating system. Suppliers enjoy precise forecasting, effective demand management, and smooth integration into cross-border fulfillment networks. Partnering with leading brands, we manage both dropship and cross-dock fulfillment for large-scale transactions, transforming global supply chains into predictable, efficient workflows akin to software systems.With strong backing from top-tier investors and institutional financing partners, coretylynt has achieved triple-digit million GMV, operates in six international markets, and is swiftly moving toward profitability. Our team of over 80 professionals, based in Berlin and Asia, is committed to creating the world’s first industrial-grade AI operating system for materials, redefining how global trade functions in one of the world’s largest and most critical industries.Join our dynamic Tech team, where you will collaborate with highly ambitious and knowledgeable engineers, tackle complex challenges, and gain exposure to commercial aspects.Our Tech Stack: Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), AWS, GitHub Actions, Node.js, Java 21 (Spring Boot 3), Postgres, Kinesis, Terraform, Typescript, NextJS, React.

FlixMobility GmbH is looking for a Senior Software Engineer - Mobile/Android (m/f/d) to join the Berlin office. This position centers on building and enhancing mobile apps that serve millions of travelers around the globe. Team and Collaboration The role is part of the Android Team within the Customer Experience Stream's Demand Division. The group includes a product owner, UX specialist, Agile tester, and several engineers. Together, they focus on the travel onboarding journey and post-booking features to make the Flix app a reliable companion for passengers. Close collaboration with iOS colleagues and other feature teams ensures a unified mobile experience. Delivering well-integrated, thoroughly tested features is a key part of the work. What You Will Do Develop and maintain scalable Android applications with a strong focus on user experience Refine onboarding and post-booking flows to improve the passenger journey Work alongside cross-functional teams to deliver cohesive mobile features Maintain code quality and reliability through comprehensive testing Tech Stack Languages & Architecture: Kotlin, Jetpack Compose, MVVM, Clean Architecture Networking & Data: GraphQL, Firebase Remote Config, Crashlytics Dependency Injection: Dagger/Hilt Testing: Espresso, Robolectric, JUnit CI/CD & Automation: GitLab CI/CD, Fastlane, Docker Collaboration Tools: Figma, Microsoft Teams, Atlassian Jira, Confluence, Atlas Benefits Competitive salaries Growth and development opportunities Collaborative culture with personal ownership Work on products used by millions of travelers

Join praxipal, where we are pioneering an AI-driven administrative workforce for healthcare aimed at alleviating the global shortage of medical personnel.Our medical assistants are crucial and deserve to focus on patient care rather than administrative tasks like managing callbacks, scheduling, and handling invoicing. This is why we developed Luna.Luna, our AI receptionist, efficiently manages and automates phone communications, earning the trust of over 100 medical practices. We are now expanding Luna's capabilities from voice interactions to comprehensive patient communication across all channels. Our vision is to evolve Luna into a fully-fledged AI solution that automates all administrative functions within medical practices, seamlessly integrated into existing systems.With backing from one of Europe’s premier investors, we are among the fastest-growing healthtech startups in Germany. Our diverse team includes alumni from Palantir, Amazon, SAP, the University of Cambridge, and the Hasso Plattner Institute.We are seeking a Senior Software Engineer focused on data integration to establish the technical foundation that will allow Luna to streamline workflows across numerous medical practices.

Join the innovative INSPO team at ebreuninger GmbH & Co. as a Senior Backend/Infrastructure Developer. We are seeking a passionate individual who excels in backend development and infrastructure management to help us enhance our digital solutions. This is an excellent opportunity for someone who thrives in a collaborative, remote work environment.

About the Role octoenergy is looking for a Fullstack Engineer (m/w/d) with experience in Next.js and Python to join the Berlin team. This position focuses on building and improving our customer portal and the broader ecosystem supporting heat pumps. What You Will Do Develop and maintain features for the customer portal using Next.js and Python. Work on projects that shape how clients interact with our energy solutions. Contribute to products that support more sustainable energy use. Location This role is based in Berlin, Germany.

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.

Your ImpactJoin our dynamic DIAL team within the Phone Assistant domain as a Senior Software Engineer. Your mission is to transform patient access to care and optimize daily practice management for healthcare providers through our innovative Phone Assistant solution.You'll collaborate within a feature team to develop cutting-edge AI-driven voice services that enhance phone interactions for millions of users in Germany, France, and Italy.At Doctolib, being part of our tech team means you are building impactful products and features aimed at improving the everyday experiences of care teams and patients alike.

At JetBrains, we are passionate about code. Since our inception in 2000, we have dedicated ourselves to creating the most powerful and effective developer tools available. By automating routine checks and corrections, our tools enhance productivity, enabling developers to innovate and create freely. Kotlin, a modern programming language developed by JetBrains, targets Java, Android, JavaScript, and native platforms. Since its introduction in 2016, Kotlin has rapidly gained traction, becoming the official language for Android development and receiving support from numerous frameworks, engines, and tools. With Kotlin Multiplatform and Compose Multiplatform, our mission is to empower Android developers to create exceptional multiplatform applications. The Kotlin Multiplatform Tooling team is at the forefront of this initiative, developing tools that simplify the process. We are actively working on Kotlin Multiplatform plugins for IntelliJ IDEA and Android Studio, alongside enhancing IntelliJ IDEA's Android support, KDoctor, and the Kotlin Multiplatform wizard. We are looking for a passionate Android developer who can share their insights and experience with our team while contributing to the development of tools that they have always envisioned. Our international and friendly team welcomes applicants who share our enthusiasm for coding.

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.

Transform the Future of TravelBecome part of the GetYourGuide mission to connect travelers with unforgettable experiences across the globe. Trusted by millions, our platform offers unique activities that redefine journeys. Are you ready to explore your potential within a vibrant community? Join us at our Berlin headquarters or one of our local offices worldwide, from New York City to Bangkok. Start your adventure at getyourguide.careers.Team PurposeThe Search Platform team at GetYourGuide empowers product and engineering units to create exceptional search and discovery experiences by providing a reliable platform that delivers accurate and timely information about our offerings through robust interfaces.Your ContributionCollaborate cross-functionally with engineers, designers, data scientists, and analysts.Enable rapid iteration within your team through the design, launch, and analysis of A/B experiments.Continuously enhance our codebase, systems, and workflows.Create and implement scalable, efficient solutions.Guide and mentor other team members while participating in recruitment.Engage in full-stack development using a diverse technological toolkit, including Java, Spring Boot, PHP, Vue.js, TypeScript, SASS, Node.js, MySQL, PostgreSQL, GraphQL, Kafka, OpenSearch, and Kubernetes.

At Enpal, we are more than just a company; we are a movement committed to transforming the energy landscape. As a prominent greentech unicorn and one of Europe’s fastest-growing energy companies, we strive to make solar energy accessible and hassle-free for homeowners across the continent. Our revolutionary business model, encompassing solar panels, heat pumps, home energy storage systems, and EV charging stations, is reshaping the residential energy market. Our mission is to empower homeowners to adopt clean energy solutions, paving the way for a sustainable, decentralized energy future.As a frontrunner in the residential solar energy sector, Enpal is on a growth trajectory with a clear vision: to spearhead Europe’s transition to sustainable and decentralized energy generation.Job OverviewWithin our Energy Platform, we oversee the integration and digital operation of Enpal’s products installed in customer homes. From optimizing heat pumps and enhancing the functionality of wallboxes to facilitating energy trading on the market, our platform supports all Enpal energy products. Our work spans embedded engineering for our proprietary IoT hardware, managing cloud infrastructure for fleet operations, and crafting user experiences.As a Senior Software Engineer (f/m/x) on our team, you will delve into and directly engage with intelligent and renewable energy systems. Your responsibilities will encompass everything from hardware collaboration to data ingestion and control of IoT devices via the cloud, as well as designing user-friendly experiences.We pride ourselves on speed, agility, and significant career advancement opportunities. Our vision of making sustainable energy accessible to all is realized through a customer-centric approach and collaboration between software development, product management, and lean, experiment-driven business development.Join us in honing your professional skills, participating in the energy revolution, and collaboratively driving the sustainable change we wish to see in the world! We eagerly await your application.Your Role at EnpalSoftware Development. We are committed to delivering incremental value with each iteration and celebrate improvements in user experience that positively impact our climate goals.Enhancing Developer Satisfaction. We strive to eliminate late-night deployments and tedious manual regression tests by focusing on improving stability and automating processes, including load testing and vulnerability scanning.

Design and develop robust, scalable systems and services tailored for personalized content delivery.Implement intricate architectures that encompass both backend and frontend components, ensuring optimal reliability, efficiency, and maintainability.Work collaboratively with diverse teams to seamlessly integrate machine learning models into production systems.Lead comprehensive feature development, from initial concept and design through implementation, testing, and deployment.Influence architectural decisions that adhere to best practices in system design, code quality, and DevOps automation.

At Enpal, we are more than just a company; we are a movement aiming to transform the energy landscape. As a distinguished greentech unicorn and one of the fastest-growing energy firms in Europe, we are committed to making solar energy accessible and effortless for homeowners across the continent. Our innovative approach to solar panels, heat pumps, home energy storage systems, and EV charging stations is revolutionizing the residential energy market. With our mission to empower homeowners to adopt clean energy, we are paving the way for a sustainable and decentralized energy future.As a frontrunner in the residential solar energy sector, Enpal is expanding rapidly with a clear vision: to lead Europe’s transition towards sustainable and decentralized energy generation.Job OverviewIn the Energy Platform, we manage the integration and digital operation of Enpal’s products installed in customer homes. Whether it’s controlling heat pumps, enhancing the functionality of wallboxes, or trading energy on your behalf, we provide the platform for all Enpal’s energy solutions. Our responsibilities span from the embedded engineering of our own IoT hardware to managing cloud infrastructure that processes and optimizes our fleet and crafting exceptional user experiences.As a Senior Software Engineer (f/m/x) on our team, you will play a crucial role in building and shaping a cutting-edge Data Platform at the heart of our entire solar system fleet, empowering our other teams to deliver exceptional customer experiences.We offer a dynamic work environment with speed, agility, and significant career growth potential. Our vision to make sustainable energy accessible to all can only be realized through a customer and product-centered approach, and close collaboration among software development, product management, and lean, experiment-driven business development.Join us in developing your professional skills, participating in the energy revolution, and taking ownership of the sustainable changes we wish to see in the world together! We eagerly await your application.Your Role at Enpal:Software Development. We are focused on delivering incremental value with each iteration, celebrating improvements that enhance user experiences while contributing to our climate goals.Enhancing Developer Experience. We strive to minimize late-night deployments and repetitive manual testing. Our goal is to improve stability and automate as much as possible, including load tests and vulnerability assessments.Professional Growth. We foster an environment that encourages continuous learning and development.

Technical LeadAbout Orcrist TechnologiesOrcrist Technologies is at the forefront of innovation with the Orcrist Intelligence Platform (OIP), a cutting-edge, Kubernetes-native solution designed to facilitate secure open-source intelligence collection and analysis for defense and public safety sectors.Role OverviewAs a Technical Lead, you will steer the architecture of our data platform. Your responsibilities will include designing and constructing the lakehouse infrastructure (utilizing technologies such as Hudi, Trino, Kafka, NiFi, and PySpark) that underpins all downstream AI and analytics offerings, while also providing mentorship to our team of Data Engineers.ResponsibilitiesTake ownership of the architecture for our data lakehouse—make informed decisions on build-vs-buy, craft technical designs, and direct implementation efforts.Develop production-level Python code for essential data pipelines and infrastructure components (including PySpark, Kafka, and NiFi).Establish engineering standards for code quality, testing, observability, and documentation.Guide and mentor Data Engineers through code reviews, one-on-one sessions, and technical advice.Collaborate with Product teams to transform requirements into scalable technical solutions.Design and implement data governance frameworks focusing on lineage, cataloging, and compliance with government security regulations.QualificationsMinimum of 6 years of experience in data engineering, with at least 2 years in a leadership or architectural capacity.Proficiency in Python (including PySpark and pandas) and SQL, along with a comprehensive understanding of lakehouse architectures and data modeling.Experience with streaming technologies (e.g., Kafka), batch processing frameworks (e.g., Spark), and modern table formats (e.g., Hudi, Iceberg, or Delta).Proven track record in building and maintaining large-scale data platforms in production environments.Eligibility to work in Germany; EU/NATO citizenship preferred for roles involving export control.Preferred QualificationsProficiency in the German language (B1 or higher).Experience in defense or government data environments.Familiarity with graph databases or machine learning infrastructure.BenefitsAccess to a modern technological stack (Hudi, Ozone, PySpark, Trino, Kafka, Kubernetes).Work on mission-driven projects that make a significant impact.Remote-first work culture based in Germany.Opportunities for meetups in Berlin.30 vacation days per year.Budget for equipment and professional development.

About the RoleJoin SumUp as a Senior Embedded Engineer within our Hardware Tribe, where you will collaborate with a talented cross-functional team of Hardware Engineers, Product Managers, QA Engineers, and more. Your expertise will be pivotal in developing our innovative Android-based payment devices, guiding the process from bootloader and kernel development to framework integration and validation.This is an exciting opportunity as we transition to using the Android platform for our proprietary hardware solutions. Our payment devices are uniquely designed with a focus on security and customization, necessitating a profound understanding of both embedded hardware and software.This position requires on-site presence in our Berlin office, as we value the organic interactions that emerge from working closely together.About the TeamYou may have already encountered our card readers while enjoying a cappuccino or settling a bill at your favorite salon. Our Hardware team is dedicated to crafting elegantly designed card payment devices and accessories that empower our merchants to launch, manage, and expand their businesses. We tackle a variety of engineering challenges spanning industrial and electronic design, embedded systems, mobile applications, and backend services.We foster an environment of open communication and continuous learning rather than strict regulations. If you are eager to innovate and support millions of independent merchants in achieving success, we encourage you to apply!Your ResponsibilitiesLead the system bring-up for the Android Embedded platform, focusing on bootloader, kernel, and driver integration.Create and integrate custom modules for SumUp, including kernel drivers, power management, and connectivity components.Enhance the build system to ensure stability and scalability across the platform.Debug hardware and software issues at the protocol level (I2C, SPI, UART, SDIO, etc.).Conduct testing and validation to ensure timely delivery of high-quality releases.Work closely with Hardware Engineers, QA, Product Managers, and Manufacturing/Supply Chain teams.Deliver Android OS features independently and contribute to a culture of engineering excellence within the Hardware Tribe.

Join our innovative team as a Backend Engineer focused on developing cutting-edge Business Intelligence applications. In this role, you will leverage your expertise to build robust backend systems that support data-driven decision-making processes. Collaborate with cross-functional teams to ensure the seamless integration of data and functionality, enhancing the performance of our applications.