Senior AI/ML Engineer at SumUp | Berlin, Germany

At SumUp, our mission is to empower small businesses by providing them with accessible and user-friendly tools for payments, finance, and customer relationships. We are a dynamic team grounded in our core values: Founder’s Mentality, Team First, and We Care. We foster an organization that is people-oriented, disciplined, and consistently innovating from with…

Team OverviewThe Card Not Present (CNP) Protect team is a dynamic, cross-functional unit within SumUp's Risk & Compliance tribe. We are dedicated to safeguarding millions of merchants by mitigating fraud in our card-not-present offerings. Our team excels in developing robust machine learning systems and data pipelines that facilitate real-time automated decision-making. We are currently enhancing our infrastructure to incorporate foundation model embeddings. This role offers significant ownership and impact, directly influencing the efficacy of our fraud detection mechanisms.Key ResponsibilitiesDesign, implement, and sustain high-quality Python-based data pipelines that support machine learning workflows, featuring real-time and near-real-time data processing.Assume complete responsibility for data quality and reliability, executing validations, automated testing, monitoring, and alerting with established SLAs.Enhance our data foundation by meticulously documenting architecture, data lineage, dataset definitions, and managing dependencies.Lead the governance of our Feature Store, refining usability and standardizing setup to enable data scientists to operate with speed and confidence.Collaborate closely with the Risk Platform, ML Data Platform, data scientists, software engineers, and analysts to ensure safe deployment of changes to production.

The AML AI Engineering Squad, a dynamic cross-functional team within the Risk & Compliance tribe, is at the forefront of developing state-of-the-art data products and machine learning solutions. Our mission is to enhance Transaction Monitoring and safeguard our merchant base against Money Laundering and Financial Crime. We leverage automation, AI, and engineering excellence to create innovative products that empower Risk and AML teams to operate more intelligently and efficiently.As a Senior Data Engineer, you will play a pivotal role in establishing a robust, high-quality data foundation that enhances efficiency, drives AI-driven automation, and facilitates data-informed decisions for our Risk and AML teams. Your expertise will be crucial in building and maintaining data pipelines within our system, ensuring that analysts, product managers, and AI systems have access to reliable and trusted data.Join us in shaping the future of financial safety and making a significant impact!

At SumUp, our mission is to create a fair playing field for small businesses. We empower entrepreneurs by providing them with user-friendly and cost-effective tools for managing payments, finances, and customer relationships.As an Engineering Manager, you will spearhead a new team dedicated to constructing the analytical and commercial backbone of SumUp's global sales channels. You will be responsible for merging attribution and commission models into a cohesive, scalable product that serves as a single, reliable source for commercial insights and incentive operations.Your role will encompass overseeing the newly formed Commercial Systems & Intelligence domain within the Acquisition Value stream, collaborating with various Sales Channels, as well as Pricing, Commissions & Incentives.We seek a hands-on, technically adept leader who can drive excellence in delivery, uphold high engineering standards, and enhance SumUp’s capacity to operate swiftly while ensuring quality and reliability in our web and platform ecosystems.This position uniquely intersects data, commercial strategy, and product development. You will work closely with Analytics, Data Platform, and Revenue teams to transition our methodology from isolated models to a robust, service-oriented product that effectively links analytics and operations.

About the Role As the Chief of Staff at SumUp, you will serve as a strategic ally to a C-level executive, facilitating the translation of organizational strategy into actionable plans. This pivotal role involves overseeing, planning, and communicating global initiatives and projects while enhancing the efficiency of various teams and processes. You will engage in close collaboration with C-level stakeholders to manage a wide range of topics and initiatives. Your responsibilities will encompass project management, strategic initiative oversight, communications, and cross-functional coordination, requiring a deep understanding of SumUp's context and an ability to handle sensitive and confidential information. This position significantly impacts decision-making at the leadership level. Beyond project delivery, the Chief of Staff will drive essential events and communications, including all-employee meetings, retreats, and quarterly OKR reviews, ensuring that our mission and strategy remain central to these interactions. In essence, you will play a crucial role in shaping the future of SumUp. What You’ll Do Collaborate across functions to facilitate change, advance strategic projects, and ensure teams meet their objectives. Plan and facilitate key meetings, such as board meetings, OKR sessions, and annual retreats. Continuously enhance collaborative practices within teams. Manage budget and financial planning in conjunction with FP&A, particularly concerning Capital Allocation Agreements. Coordinate resources for special initiatives and projects, including project management follow-through, and at times, leading specific initiatives. Organize pivotal team events that reinforce company culture, connectivity, and alignment with strategic goals. Communicate effectively through compelling internal and external storytelling.

Join our dynamic Design System team as an iOS Engineer at SumUp, where your expertise will shape the future of our user interface components and experience patterns. Your role will empower product teams to create cohesive and accessible user experiences, translating SumUp’s design language into a comprehensive, reusable library.As our team expands to support SumUp’s diverse ecosystem of merchant and consumer-facing products, you will have the unique opportunity to optimize and enhance a system that accelerates the development of high-quality features for millions of users around the globe.Your responsibilities will include:Defining the core user and developer experience within SumUp’s iOS ecosystem.Collaborating closely with product and design teams to develop maintainable, usable, and aesthetically pleasing components.Integrating accessibility best practices into every component, ensuring inclusivity through careful attention to content descriptions, touch target sizes, color contrast, and dynamic type.Providing hands-on technical support to product teams to help achieve company objectives, including an upcoming brand refresh.Reviewing code contributions, upholding design-system standards, and mentoring engineers on best practices for reusable UI development.Transitioning legacy UIKit components to SwiftUI while ensuring system stability.Proactively identifying and addressing technical debt to maintain high engineering standards and codebase health.

(Flexible start date, internship duration: at least 4 months)At SumUp, we are committed to empowering small businesses worldwide by offering simple and affordable financial tools that help them thrive. Today, over 4 million businesses across 36 markets depend on SumUp as their trusted financial partner for managing payments, finances, and customer relationships.We are seeking a Revenue Planning Intern to join our vibrant Revenue Operations (RevOps) team. This is a unique opportunity to delve into the financial engine of a rapidly growing FinTech company, gaining practical experience in financial modeling, forecasting, and performance analysis.This internship is not just a learning experience; it plays a crucial role in enhancing our analytical capabilities during a phase of rapid growth and increasing operational complexity. You will be instrumental in supporting essential weekly and monthly reporting, maintaining key revenue forecasting models, and assisting in building our future talent pipeline.If you are enthusiastic about making a meaningful impact and eager to learn from the ground up, this position is perfect for you!

Role overview SumUp seeks a Senior Internal Auditor in Berlin to help ensure the integrity of its financial operations. The position centers on maintaining and refining internal audit procedures, with the goal of supporting both efficiency and compliance across the organization. What you will do Carry out internal audits to evaluate financial controls and processes Collaborate with teams from various departments to collect information and review procedures Spot opportunities for improvement and offer practical recommendations Provide insights that shape financial strategies and guide decision-making Location This role is based in Berlin, Germany.

Role overview SumUp is looking for a Senior Product Designer to join the team in Berlin. This role centers on creating design solutions that make user experiences smoother and more intuitive across SumUp’s products. The team welcomes creative perspectives and values strategic thinking, especially from designers who care about putting users first. What you will do Collaborate with cross-functional teams to help shape the product vision Develop wireframes and prototypes to express and test design concepts Organize and run user testing sessions to collect feedback and improve designs Lead design processes to deliver products that are both functional and visually engaging Requirements Background in designing digital products with attention to usability and visual quality Creative and strategic approach to solving product challenges Experience working effectively within collaborative, cross-functional teams This position is based in Berlin, Germany.

About the Team: Join our dynamic Commercial Analytics Team within Finance at SumUp, where we are on the lookout for a talented Data Analyst to bolster our strategic initiatives. In this pivotal role, you will collaborate closely with the Global and European Finance Planning & Analysis (FP&A) teams, developing data models, crafting insightful reports and dashboards, and performing advanced analyses that drive impactful business decisions. Your contributions will significantly shape our business outcomes while you engage with an experienced data team, furthering the growth of our analytics chapter. Your Responsibilities: Design and manage efficient data models to monitor financial performance and key performance indicators (KPIs) throughout the customer lifecycle—from acquisition to churn—tracking metrics like recurring revenue, payback, lifetime value, and customer acquisition cost (utilizing dbt). Create user-friendly dashboards that empower self-service analytics for the Finance team and SumUp leadership. Collaborate with stakeholders to translate data into actionable insights, merging quantitative analysis with business context to facilitate informed decision-making. Contribute to data-driven objectives aligned with SumUp’s business goals, including merchant segmentation and performance evaluation. Work alongside cross-functional teams to ensure reliable data collection, proper structuring, and ease of access for analytical purposes. What We Are Looking For: At least 2 years of experience in data analytics and data modeling, ideally with practical experience. Proficient in creating advanced reports and dashboards using Google Sheets or similar tools. Experience in developing scalable, user-friendly dashboards adhering to best practices, preferably with Tableau or comparable visualization tools. Ability to translate financial and business requirements into meaningful KPIs, data models, and actionable insights across various functions. Strong problem-solving and critical thinking abilities, with excellent communication skills for effective collaboration with go-to-market and leadership stakeholders. A solid technical foundation paired with business acumen in finance, stakeholder management, and data visualization. Why Join SumUp? Be part of a global team working on large-scale fintech products utilized by millions of businesses worldwide, all from our Berlin office. This includes an office-friendly environment that fosters collaboration and innovation.

At SumUp, our mission is to empower small businesses by leveling the playing field. We provide small business owners with intuitive and affordable tools to manage payments, finance, and customer relationships. This pivotal engineering leadership position within our Lifecycle Tribe is dedicated to building and refining a world-class, high-performing website that serves as the gateway for merchants to discover, assess, and engage with SumUp—from their first interaction through activation and beyond. You will lead cross-functional teams focused on customer-facing platforms and digital experiences that are fundamental to how merchants interact with SumUp. Your work will involve tackling modern web architectures, addressing scalability challenges, and employing data-informed decision-making to enhance quality and performance. We are looking for someone with substantial hands-on experience in developing and managing large-scale, consumer-grade websites where performance, accessibility, and rapid iteration are of utmost importance. We seek a hands-on, technically proficient leader who can champion delivery excellence, uphold high engineering standards, and reinforce SumUp's capacity to act swiftly while ensuring quality and reliability across our web and platform ecosystems.

Revenue Planning Analyst Location: Berlin | Office-first About Our Team The Revenue Planning team is a pivotal component of SumUp's commercial framework, expertly transforming intricate data regarding products, markets, and merchant segments into actionable financial insights that guide our growth trajectory. As we expand our influence—from automating forecasting processes to enhancing our finance business partnerships—this role becomes crucial. You will engage with models and analyses that directly impact the allocation of marketing investments across millions of merchants in diverse markets, granting you significant commercial responsibility early in your career. Your Responsibilities Enhance and maintain the Customer Acquisition Budget (CAB) consolidation model, creating a unified Payback view by country across European channels. Facilitate the migration of forecasting processes from Google Sheets to scalable platforms like Pigment, boosting accuracy across various products and markets. Serve as the finance business partner for Brand Marketing, overseeing the Acquisition forecasting process and aiding in the Brand performance matrix. Conduct in-depth analyses across countries, channels, and merchant segments to uncover opportunities for optimizing CAB spending and enhancing Payback. Develop financial models to bolster product-level revenue and Payback forecasting. Assist the Operations team with a merchant acquisition forecast segmented by category to streamline onboarding and customer support planning. Ideal Candidate Profile Demonstrated experience in an analytical capacity such as Financial Planning & Analysis (FP&A), business analytics, consulting, or data analytics, with practical exposure to financial modeling or forecasting. Exceptional proficiency in Excel or Google Sheets, capable of independently developing, maintaining, and refining complex models. Familiarity with SQL and the ability to extract and manipulate data from databases effectively. Skilled in transforming business inquiries into structured analytical frameworks and conveying findings clearly to non-technical stakeholders. Proficient in managing multiple priorities within a cross-functional environment, exhibiting a proactive and organized approach to ownership. Why Join SumUp? Seize the opportunity to collaborate with a global team of SumUppers on large-scale fintech products that serve millions of businesses worldwide.

Join Our Dynamic AI Team:At SumUp, a leader in the fintech space, we are dedicated to providing an unparalleled customer experience. Our Global Operations team seeks a talented and enthusiastic Data Scientist to enhance our AI initiatives. You will play a pivotal role in developing models that directly impact customer interactions and the overall efficacy of our AI products.In this position, you will engage in the design, testing, and implementation of advanced machine learning and AI models. Your efforts will bolster our customer support framework by pinpointing areas for improvement and customizing experiences to meet merchant requirements.Your collaboration with diverse teams—including analysts, ML engineers, and product managers—will be essential in translating business objectives into actionable, measurable ML solutions. Your work will shape the future of our customer support, enabling SumUp to remain a customer-centric organization.

Role Overview airapps is looking for an AI/ML Engineer to help design and build machine learning models. This role works closely with a skilled team focused on using technology to improve processes and outcomes. Location Berlin Metropolitan Area

About the RoleWe are on the lookout for two highly skilled backend engineers to join our dynamic team in Berlin. You will be instrumental in advancing the development and implementation of our technology, enhancing our capacity to create core backend functionalities, and empowering other teams to utilize this backend for their projects.If you have a passion for creating exceptional products, thrive in a fast-paced environment, and are eager to contribute to the success of an ambitious startup, this is the perfect opportunity for you.Our Tech Stack:Python / FastAPIPostgreSQL / MongoDB / ElasticCloud LLM providers + bare metal GPUsGCPAs an early team member, you will assume significant responsibilities from day one, with the chance to influence our technological architecture and infrastructure.Join one of the most ambitious AI companies today, collaborating with a world-class team of experts in their fields, and experience an incredibly stimulating work environment. In This Role You WillLead the delivery of complex projects, coordinating with cross-functional teams, and ensuring timely completion of essential components.Develop a deep understanding of Reliant's vision and integrate this into your architectural and process decisions in daily operations.Offer insights to refine UI/UX concepts and assist in the planning of backend and infrastructure development.Take proactive responsibility for long-term code quality and architecture. About YouThe ideal candidate will have a proven track record in backend or full-stack development, with a focus on rapid innovation and effective systems design that supports growth opportunities for both the product and the team.To thrive in this role, you should possess the following skills and experiences:5+ years of demonstrated experience in building backend services or distributed systems.Ability to design, develop, test, and maintain backend services and APIs that support product features, including writing robust, production-quality code.Engage in system and service design; contribute to architectural discussions and make informed trade-offs regarding scalability, latency, cost, and reliability.Navigate ambiguity effectively; translate vague or high-level requirements into actionable implementation plans.Collaborate with cross-functional partners including product management, frontend, UX, data, and operations to define requirements, plan implementations, and deliver features.Ensure high code quality by writing, reviewing, and improving unit/integration tests; actively participate in code reviews.

At Pipedrive, we recognize that exceptional products are the result of exceptional people. Our team embodies our core values, and we prioritize these in our hiring process. Since our inception in 2010, we have been dedicated to empowering sales and marketing teams with intuitive, robust tools that streamline daily operations. Today, our cloud-based platform is trusted by over 100,000 businesses across 179 countries. From a humble beginning of just five individuals, we have expanded to a diverse, global workforce of over 850 professionals from more than 50 nationalities, with ten offices across Europe and the U.S. In 2020, we celebrated a significant milestone when Vista Equity Partners, a leading global investment firm focused solely on enterprise software, data, and technology-enabled companies, became our majority investor, placing Pipedrive among Estonia's elite unicorns.We are currently seeking a Principal AI/ML Scientist & Engineer to spearhead a dynamic team of Applied Scientists and AI/ML Engineers. This role is ideal for a pragmatic "Builder-Scientist"—a technical leader with a rigorous scientific background who is also passionate about delivering data products that captivate our customers. You will define the technical roadmap for AI/ML solutions that harness the potential of both structured and unstructured data, effectively bridging the divide between cutting-edge research and production-ready systems. Your success will be measured by your technical leadership, the leverage you provide, and the tangible business results you drive.

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.

About UsAt Melotech, we are transforming the media and entertainment landscape by creating art through innovative technology. In just two years, our creations have captivated audiences for over 3 billion minutes globally. Founded by visionary entrepreneur Soheil Mirpour, we are financed by leading venture capitalists including Cherry Ventures, Speedinvest, and GFC, along with distinguished angel investors from esteemed firms such as Spotify, Blackstone, and KKR.Your RoleAs an AI/ML Engineer Intern, you will serve as the technical foundation of our content platform. You will confront essential challenges such as: How do we construct scalable ML systems that cater to millions while ensuring low latency? What is the most effective architecture for training and deploying models that can analyze cultural trends in real-time? How can we utilize state-of-the-art models to enhance the creative process without sacrificing quality? Working independently alongside our founder and team, your solutions will significantly impact our company's trajectory. Your day-to-day responsibilities will include:Building and deploying production-ready ML models within our content ecosystem.Designing scalable ML infrastructure and pipelines to manage extensive media datasets.Implementing inference systems for optimizing content across various sectors.Fine-tuning and deploying multimodal AI systems using best practices in MLOps.Collaborating with data science teams to transition research models into production systems.Optimizing model performance for cost efficiency while upholding accuracy and speed standards.Integrating ML features into existing platforms and developing APIs for seamless model access.Your ProfileYou are an aspiring ML engineer focused on production, adept at connecting advanced technology with scalable systems. Your strengths lie in establishing robust ML infrastructures that empower real-world applications at scale. You excel in dynamic environments where your technical choices significantly influence business results and user experiences. Your qualifications typically include:A degree in Computer Science, Machine Learning, Mathematics, Engineering, or a related technical field.3+ years of practical ML engineering experience, building production systems within major tech firms, high-growth startups, or media/entertainment platforms.Proficiency in programming languages such as Python and familiarity with ML frameworks like TensorFlow or PyTorch.Strong analytical and problem-solving skills alongside effective communication abilities.

About UsAt Melotech, we are transforming the media and entertainment landscape by merging art with technology, crafting experiences that resonate with audiences globally. In just two years, our innovative projects have garnered over 3 billion minutes of engagement worldwide.Founded by visionary entrepreneur Soheil Mirpour, we are proudly supported by leading venture capitalists including Cherry Ventures, Speedinvest, and GFC, along with esteemed angel investors from top firms such as Spotify, Blackstone, and KKR.Your RoleAs a Machine Learning Engineer at Melotech, you will be the pivotal force driving our content platform. You will face essential challenges: How can we construct ML systems that efficiently serve millions while ensuring low latency? What is the best architecture for developing and deploying models that interpret cultural trends instantaneously? How can we harness advanced models to enrich creative processes without compromising quality? Your autonomous work will directly shape our success, collaborating closely with our founder and team. Daily responsibilities may include:Building and implementing production-grade ML models within our content ecosystem.Designing scalable ML infrastructure and pipelines to manage extensive media datasets.Creating inference systems for content optimization across various sectors.Tuning and deploying multimodal AI systems utilizing MLOps best practices.Partnering with data science teams to transition research models into production-level solutions.Enhancing model efficiency for cost-effectiveness while ensuring accuracy and rapid response times.Integrating ML functionalities into existing platforms and developing APIs for streamlined model access.Your ProfileYou are an ML engineer focused on production who connects cutting-edge technology with scalable systems. Your expertise lies in constructing resilient ML infrastructures that support real-world applications at scale. You thrive in dynamic environments where your technical choices significantly influence business outcomes and user experiences. Your qualifications typically include:A degree in Computer Science, Machine Learning, Mathematics, Engineering, or a related field.3+ years of practical ML engineering experience developing production systems at leading tech companies, high-growth startups, or in the media/entertainment sector.Strong grasp of machine learning frameworks and libraries.Experience with cloud platforms and deployment strategies.Proficiency in programming languages such as Python, Java, or C++.

Trinetix is seeking a talented AI Engineer to join our innovative team.As a part of Trinetix, you will work on exciting projects with a leading global telecommunications company that operates one of the most reliable internet backbones across over 100 countries. In this role, you will contribute to ambitious AI initiatives aimed at enhancing network operations through intelligent automation, predictive analytics, and AI-enabled workflows.Your work will involve developing GenAI applications, AIOps intelligence, and RAG-based systems, helping to revolutionize the monitoring, analysis, and operation of complex telecom infrastructures. This position integrates engineering, data science, and product strategy to deliver AI solutions that have a significant business impact.Join us to advance your career in a vibrant international setting while playing a pivotal role in shaping the future of AI-enhanced network operations.