Senior Backend Software Engineer (m|w|d)

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.

About Our Team At SumUp, we provide a cutting-edge Point-of-Sale (POS) solution that empowers businesses such as cafes, shops, bars, and hair salons to operate seamlessly and grow. Our platform boasts a vast array of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our POS solution integrates flawlessly into the SumUp SuperApp, which is compatible with our proprietary register hardware as well as mobile devices like tablets and smartphones. As a Senior Android Developer, you will work alongside an innovative, cross-functional team consisting of Product Managers, Product Designers, Engineering Managers, and fellow developers. About the Role We are transitioning towards a Kotlin Multiplatform (KMP) strategy, facilitating shared development between Android and iOS. In this role, you will gain experience with this technology, helping to shape the future of our mobile applications. If you are a developer who prioritizes user-centric design, precision, and effective collaboration, you will thrive here. You bring structure to communication and flourish within a cross-functional environment. This position is based in Berlin, where face-to-face interactions fuel innovation and teamwork. Your Responsibilities Develop new features for the item catalog within the SumUp SuperApp Improve application architecture and actively contribute to our Kotlin Multiplatform strategy Enhance and maintain our unified Android app, utilized in over 60 countries, ensuring high-quality and scalable solutions Drive product evolution by identifying improvement opportunities and participating in daily decision-making Create comprehensive documentation and implement thorough testing for features prior to release Work closely with Designers, Product Managers, and Android engineers to ensure a cohesive UX experience across platforms Mentor and coach junior engineers You Will Excel in This Role If: You possess 8+ years of experience in mobile engineering, particularly with Android and Kotlin. You have 2+ years of experience with Jetpack Compose. You have a strong grasp of software design patterns (e.g., MVVM, MVI) and expertise in creating modular, scalable app architectures. You are knowledgeable about reactive programming (Flow, Coroutines, and Concurrency).

JetBrains s.r.o. creates tools that help developers automate repetitive tasks so they can focus on writing quality code. Since 2000, the company has aimed to make software development more productive and enjoyable for engineers worldwide. Role overview The Customer Success Engineer - Kotlin Multiplatform (KMP) supports engineering teams as they adopt KMP in real-world projects. This role guides organizations from their first evaluation through to successful deployment. Along the way, it gathers feedback and collaborates closely with JetBrains product teams to help shape the future of KMP. What you will do Work directly with organizations at various stages of KMP adoption, from initial exploration to production rollout. Assist teams in migrating, integrating, and scaling shared codebases using Kotlin Multiplatform. Support teams moving from experimentation to production and help address technical challenges as they arise. Reach out to potential users who could benefit from adopting KMP. Identify each customer’s technical needs, use cases, and any barriers to adoption. Advise on architecture, feasibility, and strategies for implementing KMP. Collect structured feedback and insights from clients. Collaborate with JetBrains product and engineering teams to influence the KMP roadmap and improve available tooling. Common questions you'll help solve What is the safest way to migrate a large Android app to shared logic? How much code sharing is practical or advisable? How can teams address resistance from iOS developers working with Kotlin APIs? What’s the best way to organize a codebase for collaboration across teams? How can teams resolve slower build times after introducing KMP? How success is measured Organizations deliver Kotlin Multiplatform in production environments. Teams increase their use of shared code over time. KMP adoption continues beyond initial trials. User feedback results in tangible improvements to KMP and its tooling. Requirements Experience working with Kotlin, either for Android or backend development. Understanding of mobile architectures on both Android and iOS, especially with Kotlin. Strong communication skills and a knack for problem solving. Background with cloud technologies and CI/CD pipelines. Ability to collaborate effectively within a team-driven environment. Location This position is available in Amsterdam (Netherlands), Berlin or Munich (Germany), or remote within Germany.

Join Our Innovative TeamAt SumUp, we provide powerful Point-of-Sale (POS) solutions that empower diverse businesses such as cafes, shops, bars, and salons to thrive. Our platform features robust tools for product management, inventory oversight, business analytics, regulatory compliance, and customer loyalty programs.Our advanced POS solution is seamlessly integrated into the SumUp SuperApp, supporting both our proprietary hardware and a variety of mobile devices.As an Android Developer, you will work alongside a talented, cross-functional team comprising Product Managers, Designers, Engineering Managers, and fellow developers.Your RoleWe are transitioning to a Kotlin Multiplatform (KMP) strategy to facilitate shared development for both Android and iOS applications. In this dynamic role, you will gain expertise, refine your skills, and contribute to the evolution of our mobile applications.You are a developer who prioritizes user-centric design, values clear communication, and excels in collaborative environments.On-site Collaboration in BerlinWe believe that in-person interactions drive innovation and teamwork, making this role exclusively on-site in Berlin.Your ResponsibilitiesDevelop and enhance features for the item catalog within the SumUp SuperApp.Contribute to the architectural improvement of the application while supporting our Kotlin Multiplatform initiative.Maintain and enhance our unified Android application, serving over 60 countries and ensuring high-quality, scalable solutions.Identify areas for enhancement, influencing product evolution and participating in daily decision-making.Create comprehensive documentation and execute thorough testing for new features prior to deployment.Work closely with Designers, Product Managers, and Android engineers to provide a cohesive user experience across platforms.Mentor and coach junior engineers.Who You AreYou possess 3+ years of experience in mobile engineering, specifically with Android and Kotlin.You have 2+ years of experience utilizing Jetpack Compose.You have a strong understanding of software design patterns (e.g., MVVM, MVI) and are skilled in creating modular, scalable app architectures.You are passionate about user-centric design and thrive in a collaborative environment.

At JetBrains, we are passionate about coding. Since our inception in 2000, we have been dedicated to creating the most robust and efficient developer tools in the industry. Our products automate routine tasks, enhancing productivity and allowing developers the freedom to innovate and excel. We are seeking a talented Software Developer to join our core team focused on the development of Ktor, an asynchronous framework designed for building connected applications. Ktor offers a comprehensive HTTP server and client stack alongside various low-level subsystems (I/O, networking, protocols, etc.) and an extensive array of customizable features. Our team is committed to enhancing existing functionalities while also pioneering new capabilities within the framework.

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 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.

Join Databricks as a Senior Staff Software Engineer! At Databricks, we are passionate about empowering data teams to tackle some of the world's most challenging problems, ranging from security threat detection to groundbreaking cancer drug development. Our mission is to build and operate the finest data and AI infrastructure platform, allowing our customers to concentrate on the high-value challenges central to their missions. Our engineering teams develop sophisticated products that address significant needs globally. We are responsible for one of the largest-scale software platforms, consisting of millions of virtual machines that generate terabytes of logs and process exabytes of data daily. Given our scale, we frequently encounter cloud hardware, network, and operating system issues, and our software is designed to shield our customers from these challenges seamlessly. The Delta DML team is responsible for the core write-path operations of Delta Lake, the open-source storage layer powering the Databricks Lakehouse. Our goal is to deliver top-tier performance and a smooth user experience at massive scales, with the majority of data processed in Databricks traversing our platform. We spearhead performance innovations such as Low Shuffle Merge and Deletion Vectors, and actively contribute to open-source initiatives to unify Delta and Iceberg formats. We are looking for a highly capable and experienced Senior Staff Software Engineer to join our backend team. In this pivotal role, you will be key in designing, developing, and maintaining robust backend systems that power Databricks workspaces. You will create the next-generation platform for serving workspace assets, ensuring high queries per second (QPS), low latency, reliability, and performance, while proactively addressing future growth challenges. Additionally, as a senior team member, you will provide technical leadership, mentorship, and guidance to junior engineers, enhancing overall team coding practices and system designs. Your Impact: Address real business needs at scale through your software engineering expertise. Conduct low-level systems debugging, performance measurement, and optimization on extensive production clusters. Architect design solutions, influence product roadmaps, and take ownership of new projects. Implement tools to enhance automation and operability of services. Utilize your extensive experience to help prevent and investigate production issues. Plan and lead complex technical projects that involve collaboration with multiple teams across the company. Act as a technical team lead by mentoring others, leading sprint planning, delegating tasks, and participating in project planning.

At Flix, we foster a technology-driven culture where creativity meets significant real-world applications. We offer competitive compensation, ample opportunities for professional advancement, and a collaborative environment that encourages ownership and innovation.We are on the lookout for a Software Engineer (Kotlin, Java) with robust Kotlin (or Java with a willingness to learn Kotlin) expertise to become a key member of our Capacity Management team in the Demand Division. The Capacity Management team is responsible for developing and maintaining systems that allocate, price, and manage seat availability across Flix. Our team handles high-throughput, real-time data pipelines and event-driven microservices to ensure smooth operations, even in unpredictable situations.As a Software Engineer at Flix, you will have the opportunity to influence systems that directly affect how millions of passengers book their seats and optimize Flix's capacity across our global network in real-time.Our tech stackLanguages & Frameworks: Kotlin, Spring Boot, Akka/PekkoData & Messaging: PostgreSQL, Kafka

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.

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.

Join Databricks as a Senior Staff Software Engineer focused on Backend development and be part of a team that is passionate about solving the world's toughest challenges. At Databricks, we empower data teams to turn their visions into reality—from revolutionizing transportation to accelerating medical discoveries. Our cutting-edge data and AI infrastructure platform enables clients to harness deep data insights that elevate their businesses. As a company founded by engineers with a deep commitment to customer satisfaction, we thrive on tackling complex technical challenges, from designing next-gen UI/UX for data interfacing to scaling our services across millions of virtual machines. And we’re just getting started.In this role, you will collaborate with your team to build robust infrastructure and products for the Databricks platform, ensuring they operate at scale.

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.

JetBrains is seeking an AI Lead focused on Python tools. This position centers on advancing AI technologies across the company’s product suite, with the goal of improving both user experience and product capabilities. Role overview The AI Lead will guide the development and integration of AI features into JetBrains products. The role involves direct oversight of AI project initiatives and regular collaboration with teams from various disciplines. Expect to play a key part in shaping technical direction and ensuring that Python-powered solutions continue to set a high standard in the industry. What you will do Oversee AI-focused projects from conception through implementation Work closely with engineers, designers, and product managers to align AI features with product goals Drive innovation by applying Python expertise to create and refine AI solutions Locations This role is open to candidates based in Amsterdam, Belgrade, Berlin, Limassol, London, Madrid, Munich, Paphos, Prague, remote within Germany, Warsaw, and Yerevan.

Join Delivery Hero as a Staff Software Engineer specializing in AdTech Demand. In this key role, you will be pivotal in shaping our advertising technology solutions, driving innovation, and enhancing the user experience for our global audience. We are looking for a passionate engineer who thrives in a collaborative environment and is eager to tackle complex challenges.

At Databricks, we are dedicated to empowering data teams to tackle the most pressing challenges of our time — from realizing the next mode of transportation to accelerating groundbreaking medical advancements. We achieve this by developing and operating the world’s most advanced data and AI infrastructure platform, enabling our customers to leverage deep data insights to enhance their businesses. Founded by engineers with a passion for customer satisfaction, we eagerly embrace every opportunity to address technical challenges, from crafting next-generation UI/UX for data interfacing to scaling our services and infrastructure across millions of virtual machines. And this is just the beginning.Our engineering teams create highly technical products that meet significant real-world needs. We operate one of the largest scale software platforms, featuring millions of virtual machines that generate terabytes of logs and process exabytes of data daily. At this scale, we frequently encounter cloud hardware, network, and operating system faults, and our software must effectively shield our customers from these challenges.Unity Catalog serves as our platform's native, unified, and open governance solution for data and AI. It eliminates data silos, simplifies governance, and accelerates insights at scale. We are on the lookout for a Senior Staff Software Engineer to lead the Unity Catalog Runtime Enforcement efforts. In this role, you will help build and fortify the runtime enforcement layer for Unity Catalog, ensuring secure, consistent authorization and data access across Databricks compute engines and clouds. This initiative aims to minimize incidents and simplify customer decisions by standardizing enforcement semantics.

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.

Why choose voize? We are more than just an employer!At voize, we prioritize giving frontline workers the invaluable gift of time—time to care, connect, and truly be present. Unfortunately, much of that time is consumed by administrative tasks that detract from what truly matters: the people.We are revolutionizing this by developing an AI companion that liberates nurses from administrative burdens, allowing them to reclaim up to 30% of their time. Our mission is not to replace human effort but to enhance it, amplifying their impact in the care sector. Currently, over 1,100 care facilities trust voize, and more than 75,000 nurses depend on our AI companion to streamline their daily responsibilities.Supported by a robust $50M Series A funding round led by Balderton Capital, with contributions from HV Capital, Y Combinator, and other prominent VCs, our mission is grounded in technological innovation with a profound social impact. Join us in this transformative journey!

Greetings!At Yazio, we are on a mission to empower individuals to live healthier lives through innovative technology. We are seeking a talented and product-focused Senior Mobile Engineer to join our dynamic core squad and contribute to features that inspire millions to embark on their wellness journey.As an essential member of our cross-functional team, you will collaborate closely with the Product Manager, Engineering Manager, and Designer. Your insights will shape our product, utilizing our Kotlin Multiplatform (KMP) stack to create elegant and impactful solutions for users on both iOS and Android platforms.This position offers the flexibility of being 100% remote, welcoming candidates from Germany, Spain, Portugal, or the U.K.YOUR MISSIONYour role is to transform user needs and product vision into robust, high-quality code that delivers a world-class user experience. You will oversee the technical execution within the squad, embodying best practices and supporting the entire team.Take Ownership of Features. You will convert concepts from technical design into polished, deployed features. Your responsibilities include writing clean, maintainable code, ensuring comprehensive test coverage, and monitoring the impact of your contributions in a live environment.Collaborate with Product and Design. You will be an integral part of the discussion, providing technical insights, evaluating trade-offs, and helping to shape a roadmap that balances ambition with feasibility.Promote Technical Excellence. As a steward of our codebase, you will help manage technical debt, enhance performance, and advocate for the adoption of modern practices within our Kotlin Multiplatform framework.Empower Your Team. You will act as a mentor to fellow engineers, leading by example through thoughtful code reviews, refining team processes, and sharing your expertise to foster collective growth.YOUR PROFILEWe are looking for a seasoned engineer who is not only passionate about their craft but also deeply committed to the positive impact their code has on users.Extensive Experience in Modern Mobile Development. You have a strong background in building native mobile applications on Android (Kotlin, Jetpack Compose). Familiarity with iOS development (Swift, SwiftUI) is an advantage, along with a readiness to broaden your expertise across both ecosystems. Experience with KMP is highly desirable.Proven Track Record. You possess a solid history of delivering high-quality software and have experience working in agile environments.Team Player. You thrive in collaborative settings and enjoy sharing knowledge while learning from others.Attention to Detail. You have a keen eye for detail and a commitment to maintaining high standards in your work.