Senior Backend Engineer - Payments

Join Us as a Senior Backend Engineer - PaymentsAbout This RoleIn this pivotal role, you will be part of the Everyday Banking domain within our Payments team. You will play a key role in managing and processing payment and card transactions through sophisticated, high-volume systems, ensuring our customers enjoy the best banking experience every day. Our team…

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.

At Enpal, we envision a future where every roof hosts a solar system, every home is equipped with a storage unit, and every garage houses an electric vehicle. Our mission is to make this vision a reality through an all-encompassing solution for decentralized energy, encompassing solar systems, battery storage, wall boxes, smart meters, and heat pumps. Central to our operations is our AI-driven platform, Enpal.One+, which seamlessly connects thousands of systems and optimizes electricity procurement and market feed-in.Are you prepared to develop solutions that transcend mere promises and bring genuine improvements in quality of life to countless households? What you create at Enpal will generate clean electricity for tomorrow and instigate a transformative shift in our energy consumption.Your RoleAs a Senior ERP Developer, you will be pivotal in enhancing Enpal's D365FO environment, the backbone of our operations managing thousands of energy installations across various markets. Your responsibilities will include designing and implementing customizations, integrations, and automations to streamline complex business processes into efficient system functionalities.Key Responsibilities:Contribute to the architecture of Enpal’s D365FO, including customizations and integrations.Work closely with functional consultants to transform business requirements into robust technical designs and configurations.Ensure D365FO is tailored to align with Enpal’s operational processes.Implement and maintain best practices in code quality, version control, CI/CD pipelines, and release management.Proactively seek opportunities for performance enhancements, scalability, and process improvements within the ERP ecosystem.Act as a technical mentor and subject-matter expert, guiding fellow team members and ensuring adherence to high ERP development standards.Your ProfileExtensive technical knowledge in D365FO, X++, and Microsoft Azure.Strong understanding of ERP architecture, including customization and integration practices (REST, OData, APIs, Electronic Reports, DMF).Experience in designing and optimizing data entities, extensions, and business logic.

fiskaly is looking for a Staff Backend Engineer with strong Golang experience. This position focuses on designing, building, and maintaining scalable backend services that form the foundation of fiskaly’s products. Collaboration with colleagues from various teams is a key part of the role, with a shared goal of improving system performance and setting technical standards. Locations Berlin, Germany Madrid, Spain Milano, Italy Vienna, Austria What you will do Design, develop, and maintain backend services using Golang Work closely with teams across disciplines to deliver reliable solutions Drive improvements in system performance Help establish and promote technical quality and best practices within the backend team

About the CompanyAndercore is an innovative AI-powered trading platform revolutionizing the industrial supply chain for infrastructure, energy, and construction materials. We connect thoroughly vetted suppliers from Asia, Europe, and the GCC region with local demand through a seamless integrated platform.Our proprietary AI technology digitizes and automates the entire lifecycle of materials trade—covering procurement, pricing, inventory management, logistics, and embedded financing—thus transforming countless manual processes into real-time, orchestrated workflows.Buyers enjoy instant quotes, dependable availability, and predictable delivery via our unified operating system. Suppliers benefit from precise forecasting, effective demand management, and smooth integration into cross-border fulfillment networks. We collaborate with leading brands to execute both dropship and cross-dock fulfillment strategies for large-scale transactions, turning global supply chains into predictable, repeatable, software-driven workflows.Having achieved triple-digit million GMV and operating in six international markets, we are swiftly moving towards profitability. With a diverse team of over 80 members based in Berlin and Asia, we are on a mission to build the world’s first industrial-grade AI operating system for materials—redefining the dynamics of global trade in one of the most critical industries.Backed by top-tier investors and global banking partners, we recently secured a $40 million Series B funding round led by Atomico, Project A, and Invent Capital, supported by institutional backing from Commerzbank and KfW.About the RoleAs a Senior Backend Engineer, you will serve as a technical pillar within our team, expected to lead by example, influence architectural decisions, and elevate the quality of our deliverables. You will work autonomously while remaining deeply embedded in a collaborative engineering culture.Tech Stack: Java 21 (Spring Boot 3), Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript, Next.js, React.

Join our Global Bank tribe at SumUp, where we are revolutionizing the infrastructure for merchants by providing them with a digital business account that simplifies their banking needs. Our mission is to become the top banking partner for small merchants worldwide, delivering a seamless, straightforward, and cost-effective experience. As a valued member of our team, you will be instrumental in transitioning from a fragmented regional setup to a cohesive global infrastructure, thereby enabling millions of merchants to enjoy tailored banking solutions. In the role of Senior Backend Engineer on the Global Accounts team, you will take ownership of vital components of our bank account platform. You will be involved in the design and development of a fully distributed, event-driven system built for scalability, resilience, and compliance. Your primary development language will be Kotlin, with opportunities to work with Elixir and Golang. We embrace Extreme Programming methodologies: frequent iterations, daily releases, and a strong emphasis on technical excellence and deep problem-solving. Our tech stack includes Kotlin, Golang, Elixir, Java, AWS, Kafka, PostgreSQL, and Kubernetes, complemented by observability tools such as Prometheus, Grafana, and Honeycomb. We also leverage AI-assisted development tools like Cursor and GitHub Copilot.

Affinidi builds technology that puts data ownership in the hands of individuals and businesses. The company develops decentralized digital identity products, aiming to create a trusted environment where digital credentials support secure exchanges across industries and borders. Privacy and security are central to every solution. Role overview The Senior Backend Engineer (Rust) will focus on developing and enhancing backend systems that power Affinidi’s digital identity offerings. This position emphasizes scaling, performance, and security. The work done in this role will shape how Affinidi’s products evolve to support secure data exchange. Location Based in Berlin, Germany.

About the CompanyThe AI-powered trading platform revolutionizing industrial supply in infrastructure, energy, and construction materials. It seamlessly connects trusted suppliers across Asia, Europe, and the GCC region with local demand through a unified platform.Our proprietary AI technology digitizes and automates the entire lifecycle of materials trade—from procurement and pricing to inventory management, logistics, and integrated financing—eliminating thousands of manual, relationship-dependent processes with real-time orchestration.Buyers receive instant quotes, reliable availability, and predictable delivery through our cohesive operating system. Suppliers enjoy precise forecasting, disciplined demand management, and effortless integration into cross-border fulfillment networks. We partner with prominent brands to facilitate both dropship and cross-dock fulfillment for large-scale transactions, transforming global supply chains into predictable, repeatable, software-like workflows.Supported by top-tier investors and financing partners, we have achieved triple-digit-million GMV, operate across six international markets, and are rapidly moving towards profitability. With a growing team of over 80 individuals based in Berlin (our headquarters) and Asia, we are developing the world’s first industrial-grade AI operating system for materials—redefining the workings of global trade in one of the most substantial and vital industries.

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.

Atolls is the world’s largest community-driven shopping platform, active in over 20 markets.Our mission is to empower millions to make informed spending decisions by connecting them with the right brands and retailers.With a team of over 1,000 professionals across 10 countries, we deliver products that are used daily on a global scale, giving you the opportunity to truly own your role and witness your impact. If you want to influence the platforms that consumers trust for confident shopping, we want to hear from you.About This Role:We are on the lookout for a Senior Backend Engineer (TypeScript, NestJS/Node.js) to join our Fulfilment team, based in Berlin or available for remote work from Germany. In this pivotal role, you will enhance our cashback reward platforms to create outstanding user experiences that enable our customers to earn and redeem rewards while shopping. As a vital member of our team, you will play a key role in developing and improving the digital environments our users depend on during their shopping journeys.Your contributions will significantly impact how millions of consumers interact with our platforms, guiding them towards smarter, fairer, and more rewarding choices.Our Benefits:At Atolls, we prioritize both your professional and personal advancement. Here’s what you can expect: • A culture that promotes personal and professional growth, with opportunities for internal mobility. • A supportive and open-minded team that values diverse perspectives and innovative ideas. • 32 days of paid vacation plus your birthday off, allowing you to recharge. • A flexible hybrid working model to ensure a healthy work-life balance. • A dedicated learning budget and internal training programs to facilitate your growth. • Mental health coaching to support your overall well-being.

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.

Why Join Nebius?Nebius is pioneering a transformative era in cloud computing, aimed at empowering the global AI economy. We provide innovative tools and resources that enable our clients to tackle real-world challenges and revolutionize industries without incurring significant infrastructure expenses or the necessity of establishing large in-house AI/ML teams. Our team operates at the forefront of AI cloud infrastructure, collaborating with some of the most knowledgeable and inventive leaders and engineers in the industry.Our Work EnvironmentHeadquartered in Amsterdam and publicly traded on Nasdaq, Nebius boasts a global presence with R&D centers across Europe, North America, and Israel. Our workforce of over 1,400 includes more than 400 proficient engineers, all possessing extensive expertise in both hardware and software engineering, complemented by an in-house AI R&D team.About Token FactoryToken Factory is dedicated to developing a cutting-edge platform that empowers companies to effortlessly integrate AI into their products and operational workflows. Our vision is to establish a robust, open, and scalable alternative for deploying and managing AI systems, thereby enhancing accessibility to advanced AI infrastructure for both burgeoning startups and established enterprises.We collaborate with a diverse clientele, ranging from AI-first organizations to renowned technology firms, assisting them in managing AI workloads reliably at scale. Our objective is to become the leading platform for high-performance AI inference, ensuring consistent latency, exceptional reliability, and the capacity to scale in response to demanding production requirements.Customer feedback is integral to our development approach; our iterative process is closely aligned with practical use cases.

Your ResponsibilitiesTake ownership of the backend systems that facilitate thousands of hotel bookings every day.Architect, develop, and maintain our core booking infrastructure, ensuring robust integrations with PMS platforms, channel managers, and payment processors.Establish and uphold a resilient API layer that supports our React frontend operations.Elevate the engineering standards through effective system design, transparent communication, and strong technical leadership.Collaborate closely with the founders to influence the long-term architecture and foster a culture of engineering excellence.

Atolls is the world’s largest community-driven shopping platform, active in over 20 markets.We empower millions to make informed spending choices across discovery, evaluation, and (re-)purchase by connecting individuals with the ideal brands and retailers.Our team of 1,000+ members across 10 countries develops products utilized daily on a global scale, providing you with genuine ownership and the chance to witness your impact. Are you ready to help shape the destinations people trust for confident shopping? We invite you to learn more.About This Role:We are on the lookout for a Senior Java Backend Engineer to become an integral part of our expanding engineering team in Berlin. In this pivotal role, you will be responsible for designing, developing, and scaling high-performance backend systems utilizing contemporary Java technologies and cloud-native architectures. This position is perfect for individuals who thrive on tackling complex systems, prioritize code quality, and possess a robust architectural mindset.Our Benefits:At Atolls, we are committed to fostering both your professional and personal development. Here’s what you can look forward to:A culture that champions personal and professional growth, alongside opportunities for internal mobility.A supportive and open-minded team that welcomes diverse perspectives and innovative concepts.32 days of paid vacation plus an additional day off for your birthday, ensuring you have ample time to recharge.A flexible hybrid working model to help you find the right balance between work and life.Access to a learning budget and internal training to enhance your skills in your role.Mental health coaching to promote your well-being.Regular global and local gatherings to celebrate achievements and strengthen connections.The chance to take a sabbatical after three years with the company.A cloud-based company setup, allowing flexibility and collaboration regardless of your location.*These are global benefits applicable to all employees, with additional local perks based on your location.Responsibilities:As a Senior Java Backend Engineer, you will...

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.

Join Aiven as a Backend Engineer specializing in ClickHouse. In this role, you will be part of a dynamic team focused on building scalable and efficient data solutions. You will leverage your expertise to optimize our backend architecture, ensuring reliability and performance.

About the Role airapps is hiring a Backend Quality Assurance Engineer for its Berlin Metropolitan Area team. This role focuses on maintaining and improving the quality and performance of backend systems. As part of the development group, the engineer will help deliver reliable software solutions that meet high standards.

Join SumUp's Global Bank team, where we engineer the foundational infrastructure and services that empower merchants with digital banking solutions. We simplify financial management for small businesses, ensuring reliability and ease of use. As part of our Balance Management Squad, you will play a crucial role in modernizing and consolidating our balance management systems across Europe. We are embarking on an exciting journey to develop a global transaction history service, providing merchants with consistent and transparent insights into their financial activities. In your role as a Senior Backend Engineer, you will be instrumental in updating legacy systems, fostering innovation while ensuring stability, collaborating with cross-regional teams, and architecting dependable services that cater to diverse markets with unique regulations. If you are passionate about solving intricate problems in high-load environments, have a keen interest in banking, and seek a team that embraces challenges, we encourage you to apply!

Your Role We are seeking a skilled Backend Engineer with a strong interest in telecommunications and a deep passion for software development, particularly in big data technologies. In this role, you will be pivotal in the real-time processing of our data, driving microservices and fostering a fully data-driven environment within the company. This position can be based in our emnify offices located in Berlin or Würzburg, or remotely from Germany or Poland. Your Impact Collaborate within one of our service squads, taking charge of designing, building, testing, and managing components or projects that influence the pricing and charging mechanisms at emnify. Develop APIs and real-time data processing applications utilizing streaming technologies within the Apache Kafka ecosystem, prioritizing scalability and reliability. Engage with a team on core telecommunication functions such as automated product lifecycle management in a modern cloud-based setting. Architect and design aforementioned components to operate on AWS in a scalable manner. As part of a collaborative team, you will be responsible for deploying and managing these applications using CI/CD tools such as Jenkins and Terraform, along with monitoring solutions like Grafana and Prometheus. Your Skills Proven experience in full-cycle engineering from Proof of Concept (POC) to production with JVM-based languages, preferably Scala, as a significant portion of our codebase is in Scala. Demonstrated experience in stream/data processing, cloud computing, and API development. Strong understanding of microservices architecture and design principles. Excellent problem-solving abilities and a proactive approach to challenges. Ability to work effectively within a diverse team.