Senior Software Engineer - Backend & Infrastructure

About UsHelsing is a pioneering defense AI company dedicated to safeguarding our democracies. Our goal is to achieve technological excellence to ensure that open societies can maintain their sovereignty and ethical standards.We recognize our unique obligation to approach the development and implementation of advanced technologies like AI with care and consideration. This is a responsibility we uphold with utmost seriousness.Our team consists of driven engineers, AI experts, and program managers who are passionate about solving complex, impactful challenges. We invite mission-oriented individuals to join our European teams and leverage their skills to address these critical issues. Our culture is grounded in transparency and encourages healthy discussions about the use of technology in defense, its advantages, and ethical considerations.The RoleAt Helsing, we create and implement AI-driven capabilities and the foundational infrastructure that enables semi-autonomous platforms to localize, navigate, and interpret their environments in real-time. Our software operates under stringent and unconventional technical constraints, adapts to a multitude of ever-changing environments, and supports a diverse array of demanding use cases. The solutions we develop are utilized by individuals in high-pressure, high-stakes situations, which necessitates a design that is both reliable and seamless. This presents a variety of exciting engineering challenges across several domains that you will help us tackle.

Join our innovative team at dev2 as a Senior Backend Software Engineer, where you'll be instrumental in crafting robust and scalable software solutions. In this role, you will collaborate closely with cross-functional teams to design, develop, and deploy high-performance backend systems.

P-1327 At Databricks, we are driven by a passion for empowering data teams to tackle some of the world’s most complex challenges. From revolutionizing transportation methods to speeding up medical innovations, our mission is to build and operate the leading data and AI infrastructure platform, enabling our customers to leverage profound data insights to enhance their business. Established by engineers, Databricks is embarking on an ambitious journey to develop the most advanced Lakehouse Platform. While we have a solid foundation, we aim to elevate our offerings to create significantly improved products. Our goal is to reimagine every component to provide our customers with the fastest, most user-friendly, and secure data platform for all their data workloads. As a Senior Software Engineer, you will be a key member of our Berlin site and play a pivotal role in our multi-year mission to realize our Lakehouse vision. You will engage in the entire development lifecycle and embody the core values of Databricks. The impact you will have: Our backend teams operate across various domains within our essential service platforms. You may encounter challenges such as: Addressing issues that encompass product development and infrastructure, including distributed systems, scalable service architecture, monitoring, workflow orchestration, and enhancing developer experience. Creating reliable, secure, and high-performance services and client libraries for managing and accessing massive amounts of data on cloud storage solutions, such as AWS S3, GCS, and Azure Blob Store. Developing product features that empower our customers to efficiently store and access their data.

About GetYourGuideGetYourGuide stands as the world's leading marketplace for unforgettable travel experiences. Travelers utilize our platform to uncover the best activities in their chosen destination. Since our inception in 2009, over 150 million tours, activities, and attraction tickets have been booked through GetYourGuide by adventurers from around the globe. With a dedicated global team of more than 800 travel experts and technologists, we are proudly headquartered in Berlin, complemented by 17 local offices worldwide.The Mission:At GetYourGuide, technology is the driving force behind our growth. Our work within the Marketplace is transforming global travel experiences, and we invite you to join us in this endeavor.The features we develop facilitate seamless bookings for our customers while empowering our partners to expand their businesses. This complex task presents a remarkable opportunity to create extraordinary solutions that impact global travel. From building supplier infrastructures that enhance our partners' businesses to innovating marketplace features that propel our growth, you will have the chance to craft incredible solutions at GetYourGuide.Whether you're engaged in developing dynamic search algorithms or designing new features to accelerate our company's growth, your contributions will leave a lasting impact. Our teams consistently push boundaries, exploring innovative ways to bring the magic of travel to people around the world.We operate in cross-functional mission teams composed of backend and full-stack engineers, mobile engineers, data engineers, product managers, and designers.

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.

About GetYourGuideGetYourGuide is the world's leading platform for unforgettable travel experiences, allowing travelers to uncover the best activities in their destinations. Since our inception in 2009, we have facilitated over 150 million bookings for tours, activities, and attraction tickets globally. With a dedicated team of over 800 travel experts and tech enthusiasts, we operate from our headquarters in Berlin, complemented by 17 local offices worldwide.Our Mission:At GetYourGuide, technology is the driving force behind our growth. Our Marketplace initiatives are redefining global travel experiences, and we invite you to join us in this mission. The features we develop allow customers to effortlessly book memorable experiences while empowering our partners to grow their businesses. This complex challenge presents a unique opportunity for you to create impactful solutions that scale across the globe.From crafting dynamic search and recommendation algorithms to designing new features that propel our growth, your contributions will have a tangible impact. We pride ourselves on pushing boundaries and discovering innovative ways to bring the magic of travel to people around the world.Our teams operate within cross-functional mission groups consisting of backend and full-stack engineers, mobile developers, data engineers, product managers, and designers.

Join us as a Senior Backend Software Engineer and become a vital member of one of our self-sufficient agile teams at Blacklane. Your expertise will contribute to the development of innovative services that power our platform, enhance our back-office systems, and resolve integration challenges faced by our business partners.Our technical ecosystem incorporates Ruby, Go, TypeScript, and Java services that are architected using Domain-Driven Design (DDD). These services run on our Kubernetes cluster and utilize domain events to communicate through SQS and Kafka. We leverage various data storage solutions including Postgres, MySQL, Elasticsearch, Redis, and DynamoDB, while predominantly utilizing AWS for our infrastructure and managing resources with Terraform.YOUR CHALLENGE:Address unique challenges to customize our offerings for diverse markets.Maintain high-quality standards through extensive testing, thorough documentation, code reviews, and collaborative knowledge sharing.Devote time to optimizing the performance, usability, and maintainability of the systems you oversee.Commit to ongoing personal development by acquiring new skills and technologies.Be an integral part of a motivated, open-minded, and collaborative team dedicated to enhancing travel experiences for our guests.ABOUT YOU:You are proactive, inquisitive, and thrive in a team-oriented environment.You possess a minimum of 5 years of experience in two or more programming languages.You have at least 5 years of experience with Ruby or Go.You are knowledgeable of the HTTP protocol and have experience developing or utilizing REST APIs.You write clean, maintainable code and are familiar with the complexities of distributed systems; you are comfortable working with existing codebases.You have experience with or an eagerness to learn about Event-Driven Architecture and Domain-Driven Design.You are experienced with Docker and containerized environments; familiarity with Kubernetes and Terraform is a plus.

About the Role airapps is looking for a Backend Engineer to help shape backend systems for our applications. This position is based in the Berlin Metropolitan Area. What You Will Do Design and build backend systems that support our products Focus on scalability and performance throughout development Location Berlin Metropolitan Area

About dltHubdltHub is at the forefront of innovation, leveraging the dlt library, a leading open-source Python tool for data loading with approximately 4 million downloads monthly. We are on a mission to develop the next generation of AI-native data tools built upon our robust open-source foundation.Our team is agile and thrives on experimentation, automation, and user-centric AI workflows. Founded by seasoned data scientists and machine learning engineers, we have our roots in Berlin and a burgeoning presence in the United States.We are supported by prominent investors including Bessemer Venture Partners, Foundation Capital, Dig Ventures, and technical pioneers from Hugging Face, Instana, Matillion, and more. Our core values drive us: we communicate with courage, prioritize meaningful projects, automate continuously, maintain high energy, honor our commitments, and achieve success collectively. About the RoleAs we continue to enhance our AI-first data platform, we are seeking a passionate and entrepreneurial software engineer in Berlin. This role offers the opportunity to tackle data platform challenges related to ingestion, storage, performance, reliability, observability, and AI-enhanced developer experiences. If you are driven, eager to collaborate with a motivated team, and prioritize high-quality code and innovative data systems, this position is tailored for you.

About NomosAt Nomos, our mission is to make energy accessible and cost-effective for households across Europe. We collaborate with leading technology firms to innovate energy solutions that integrate seamlessly with electric vehicles, heat pumps, battery storage systems, and more, driving down costs for consumers.About the TeamFounded by Stefan and Nils in 2024, our diverse team comprises former researchers, entrepreneurs, and senior engineers. We are united by our shared vision to revolutionize the energy landscape in Europe, fueled by a collective frustration with the existing system. We cherish a culture of open communication, accountability, and inclusivity, and we thrive in our Berlin Mitte office, valuing meritocracy and craftsmanship.Your RoleArchitect for the Future: You will help design and enhance our own operating system, which includes a modular billing engine and energy market communication protocols. Your role is crucial in ensuring our architecture keeps pace with exponential growth.Simplifying Complexity: The energy sector is rife with challenges. Your task is to tackle this complexity by developing clear abstractions and reducing the difficulty of shipping new features.Quality Over Speed: We believe in balancing speed with quality. You will ensure that we invest the time necessary to build reliable solutions that facilitate future growth.Upholding Standards: You will set engineering benchmarks, evaluate critical code, and maintain accountability within the team. Your vigilance will help us avoid shortcuts and uphold best practices.ResponsibilitiesDesign and enhance the core systems powering Nomos, including billing, procurement, metering, partner integrations, and comprehensive data pipelines.Focus on correctness, performance, and resilience. Always consider system behavior under significantly increased loads.Leverage AI tools to streamline repetitive tasks while maintaining ownership of the overall architecture and decision-making process.

Note: This position requires relocation to our Milan office.About SatispayAt Satispay, we aim to transform everyday payments into a straightforward, equitable, and accessible experience for all. Our mission now extends to shaping the future of financial transactions.We are a dynamic movement empowering millions, united by our ambition to confront significant challenges. Our fast-paced culture encourages bold thinking, collaboration, and continuous growth.If you seek more than just a typical job—if you're eager to collaborate with a talented team to create something meaningful—you've come to the right place.Your ResponsibilitiesAs a Senior Backend Software Engineer within the Business Team, you will be instrumental in designing the future of digital welfare payments, overseeing everything from employer benefits to intricate product offerings. Your role will encompass the entire journey for employers and employees, ensuring their long-term satisfaction. You will guide the technical direction, maintain quality, and ensure the delivery of complex systems affecting multiple services that enable thousands of employers to manage their corporate welfare efficiently. Here’s what a typical day looks like:Develop Multi-Service Solutions: Lead technical analysis for medium to large projects that affect multiple services in the Employer domain. Design comprehensive, reliable solutions with a focus on scalability, security, and maintainability for products that define the core of welfare.Maintain Technical Quality: Implement strong testing strategies that balance automation with manual oversight, and manage gradual rollouts with stringent monitoring to ensure precision and reliability in welfare distributions.Proactively Address Challenges: Anticipate and resolve technical challenges, fostering knowledge sharing within the organization. Tackle unique B2B registration flows and high-volume benefit allocations while ensuring code quality through diligent reviews.Ownership of Execution: Take full responsibility for your projects from conception to completion, delivering features that truly address user needs—from the employer's signup process to the employee's first use of welfare benefits—through seamless backend integration.

Attention: This position requires relocation to our Milan office.About SatispaySatispay is on a mission to transform everyday transactions, making them straightforward, equitable, and accessible for all. Our ambition is to redefine the future of money.We are a collective of innovators empowering millions, united by a common goal to address significant challenges. We are just getting started, moving swiftly, thinking daringly, and fostering a culture of trust that encourages us to question the status quo while learning and evolving along the way.As a member of the Core Team, you will engage with critical systems encompassing external bank interactions, payment orchestration, and the foundational infrastructure for Identity and Access Management (IAM). Moreover, the team manages risk-oriented services, particularly in credit risk management and fraud detection.If you're eager to contribute to impactful projects that form the backbone for all our product teams, you've found the perfect place.Your ResponsibilitiesAs a Senior Backend Software Engineer within the Core Team, you will be pivotal in crafting the infrastructure of our payment platform. Your role will encompass ensuring the technical excellence and delivery of intricate systems that influence various services and product teams throughout the organization.Your daily tasks will involve:Engine core platform domains: You will assist in the design and advancement of our most sensitive systems, such as the Transaction Ledger, IAM, and Payment Orchestration. You'll ensure these systems remain high-performing, scalable, and functional for seamless integration by our product teams.Scale risk & financial engines: You will enhance and implement services dedicated to bank integrations, credit risk, and real-time fraud detection, establishing robust logic to protect our source of truth and secure Satispay’s financial ecosystem.Cross-team technical leadership: You will spearhead technical analyses for projects that involve multiple services, leading discussions and producing comprehensive documentation (Smart Papers) to guarantee that your designs are robust and clearly understood by stakeholders and other engineering teams.

Cresta is dedicated to transforming every customer interaction into a strategic advantage by harnessing the full potential of contact centers. Our innovative platform merges cutting-edge AI with human expertise, enabling contact centers to uncover valuable customer insights, streamline conversations and processes, and empower team members to operate more efficiently. Founded by Sebastian Thrun, a visionary from the Stanford AI lab and the mastermind behind Google X, Waymo, and Udacity, our leadership team includes CEO Ping Wu, co-founder of Google Contact Center AI, alongside Tim Shi, an early member of OpenAI. We have gathered a stellar team of AI and machine learning specialists, market leaders, and esteemed investors such as Andreessen Horowitz, Greylock Partners, and Sequoia, along with former AT&T CEO John Donovan. Our esteemed clientele features renowned brands like Intuit, Cox Communications, Hilton, and Carmax, and we have been honored by Forbes and Bain Consulting as one of the premier private AI companies globally. Embark on an exhilarating journey with us as we revolutionize the contact center workforce through AI. The future of work is here, and it begins at Cresta!

At 8returns, we are revolutionizing the e-commerce landscape by addressing the challenges associated with returns—an aspect that can often be frustrating, environmentally harmful, and expensive.We are trusted by some of the fastest-growing direct-to-consumer brands, including OACE, PEGADOR, and GOT BAG, and have gained recognition from iconic brands like Fielmann, Tommy Hilfiger, and Reebok. Our mission is to innovate the post-purchase experience.As a Senior Backend Software Engineer, you will take ownership of key systems that enhance the speed, reliability, and scalability of our product. From APIs to data models and integrations, you will help transform the chaos of returns into effective margin protection. If you have a passion for clean architecture, love deploying new features, and seek true ownership of your work, then this role is tailored for you.

Please note that this position is based in Berlin, Germany — relocation support is provided if required.THE BEST WORK OF YOUR CAREERTrade Republic is Europe’s leading savings platform, operating in 18 countries and trusted by over 10 million customers with more than €150 billion in assets. Our mission is to empower everyone to build wealth by providing easy, safe, and free access to financial systems.Join us and take your career to new heights while working alongside a team of exceptional talent and cutting-edge technology to create a positive impact for millions.WHAT YOU’LL BE DOINGDevelop and test services and products using advanced tools from the JVM ecosystem, including Kotlin, Spring, Vert.x, Hibernate, or jOOQ.Design cloud services with a focus on high availability, low latency, and scalability on AWS.Implement automated software delivery utilizing GitHub Actions, container-based CI/CD pipelines, and Kubernetes orchestration.WHAT WE'RE LOOKING FORA minimum of 5 years of experience in software engineering, particularly within the JVM ecosystem.Proven experience in developing and deploying scalable features in a service-oriented architecture.A strong commitment to delivering reliable, maintainable software through iterative development and continuous delivery.Experience building platform services that support product development (prior experience in platform-focused teams is an advantage).WHY YOU SHOULD APPLY NOWOur culture values ownership, excellence, and high energy. We are dedicated to closing the pension gap and democratizing wealth in Europe. If this resonates with you, we encourage you to apply!We believe that the diverse identities and backgrounds of our team make us more innovative and effective. We are committed to fostering an inclusive environment where everyone feels respected and has equal opportunities to thrive in their careers. For any inquiries about diversity and inclusion during the interview process, please contact your recruitment partner.

Join Our TeamAt SumUp, our Sales & Order team is pivotal in developing the core Sales API and Receipt engines that drive our ecosystem. From hardware like POS systems to our Solo Card Reader, and software solutions such as Online Store and Online Payments, our aim is to simplify complex transaction data into a unified 'Sales' language. We empower teams to build independent features, ensuring seamless connectivity between sales, reporting, accounting, and fiscalization as we support merchants in scaling globally.As part of a dynamic, cross-functional team composed of Product Managers, Engineering Managers, fellow engineers, and occasionally Product Designers and Data Analysts, you will collaborate closely to innovate and enhance our offerings.Your RoleAs a Backend Engineer, you will not just write code; you will architect solutions that enable different SumUp products to communicate effectively. We foster a culture of extreme collaboration, engaging in daily pair programming, committing to high standards of 'clean' engineering, and adopting an 'AI-native' approach to accelerate our development processes.Key ResponsibilitiesDevelop and enhance high-performance Sales APIs and receipt engines using Kotlin and Spring Boot, ensuring scalability and resilience.Design and maintain robust data schemas and database interactions to manage complex transaction and sales data accurately at scale.Create and document clean, public-facing APIs that empower other engineering teams to integrate their features with the Sales Platform independently.Work on projects that link transaction data with essential business systems like reporting, accounting, and global fiscalization.Engage in pair programming to tackle complex concurrency and architectural challenges while maintaining superior code quality.Oversee the entire development lifecycle, including writing automated tests, managing CI/CD pipelines, and monitoring production service health.Utilize AI coding agents to automate repetitive tasks and enhance our delivery speed.Migrate mission-critical domain logic from external systems to streamline and centralize the 'Sales' experience within our ecosystem.Who You AreYou possess over 2 years of experience in backend engineering with the JVM stack, preferably using Kotlin and Spring Boot.You have a strong grasp of software design patterns and principles, enabling you to create efficient and maintainable code.

Join Our Team as a Lead Backend Engineer At N26, we're redefining banking with a focus on innovation and technology. As a member of our Intelligent Operations Platforms (IOP) and Assistance segments, you will play a critical role in enhancing our operations and empowering other tech teams through a robust platform approach. We are looking for a skilled Lead Backend Engineer to join our dynamic cross-functional teams. You will work within a microservice architecture, primarily utilizing Java and Kotlin with Spring Boot, to evolve our product offerings. Our teams thrive on collaboration, knowledge sharing, and autonomy, ensuring that every member's voice is heard and valued. As a Lead Engineer at N26, you will be at the forefront of integrating the latest technological advancements while tackling complex and engaging challenges daily. Your Responsibilities: Shape your team’s technical landscape by collaborating closely with Product Managers and Engineering Managers to manage product technical roadmaps and dependencies, thereby minimizing technical debt. Architect and build high-availability, high-performance web applications that serve as the backbone of our internal operations. Promote a culture of solid engineering delivery by demonstrating best practices, writing clean, well-tested, and well-refactored code, and deploying it to production frequently. Integrate AI: Implement new features and integrations with foundational models and automation systems to empower our back-office teams. Scale systems by optimizing, measuring, and monitoring distributed systems for seamless and continuous software delivery. Mentor team members and document processes to foster engineering excellence and knowledge sharing, avoiding silos. Lead initiatives aimed at enhancing our engineering culture across the company and explore ways to maximize team and organizational effectiveness. Participate in recruitment and employer branding initiatives to strengthen our engineering team. Qualifications for Success: Engineering Mindset & Design: Proficient in design patterns with a solid understanding of object-oriented programming and distributed systems principles, utilizing methodologies such as Domain-Driven Design and architectural patterns like Hexagonal, Event-Driven, and Microservices. Possess a strong track record of applying engineering best practices, including Clean Code, Test-Driven Development (TDD), Behavior-Driven Development (BDD), and deep observability. Experience in AI-augmented development frameworks and practices, showcasing the ability to leverage AI in enhancing software solutions.

This position is based in Berlin, Germany. Relocation support is available for those who need it. Role overview Trade Republic is building Europe’s largest savings platform, serving over 10 million customers in 18 countries and managing assets exceeding €150 billion. The team focuses on making wealth-building accessible, secure, and free for everyone. As a Backend Engineer (Haskell), you will help develop and improve products that support this mission. What you will do Design, build, and test backend services and products using tools from the JVM ecosystem, including Kotlin, Spring, Vert.x, Hibernate, jOOQ, and Haskell. Architect and maintain cloud services on AWS, prioritizing high availability, low latency, and scalability. Set up and manage automated software delivery using GitHub Actions, container-based CI/CD pipelines, and Kubernetes. Requirements At least 5 years of software engineering experience, ideally in the JVM ecosystem, with hands-on production experience in Haskell. Solid grasp of functional programming concepts and practical experience with the Haskell toolchain (GHC, Cabal, Stack, and related libraries). Demonstrated ability to develop and deploy scalable features in a service-oriented architecture. Dedication to building reliable, maintainable software through iterative development and continuous delivery. Experience creating foundational platform services that support and speed up product development (background in platform-focused teams is a plus). Our culture Trade Republic values ownership, high standards, and energy. The team is committed to delivering results and tackling major challenges in Europe’s financial landscape.

fiskaly develops technology that secures digital receipts and ensures legally compliant transactions for millions of users each day. By applying digital signatures, the company helps prevent tax fraud and supports merchants with a streamlined, paperless solution. The team is dedicated to simplifying receipts for everyone. Role overview This Senior Backend Engineer (Golang) position is a full-time, permanent role open to candidates based in or near Vienna, or within a two-hour time zone difference. The company is not considering freelancers for this role. What you will do Serve as a System Architect within a focused squad, developing API-first SaaS products. Lead backend development using Golang and other object-oriented languages, contributing throughout the software lifecycle. Apply modern tools, including AI coding assistants and automation, to minimize repetitive tasks and tackle complex problems. Design, build, and maintain distributed systems for fiskaly's fiscalization platform. Shape the architecture and scalability of the unified digital receipts interface. Requirements Minimum 5 years of backend development experience, with a strong background in Golang and object-oriented programming. Fluency in both German and English. Located in or near Vienna, or within a two-hour time zone difference. Available for full-time employment (no freelance contracts). Salary and contract Gross annual salary: €45,000 – €70,000 Full-time, permanent position