Senior Backend Engineer (all genders) - Golang

Sumup

About the team: You’ll join SumUp’s Merchant Intelligence squad within the Engagement Mission — a newly formed team building foundational backend services that create a shared source of truth for product and merchant data across the business. The team is focused on two core services: * Product Catalogue Service — a global source of truth for all products SumUp sells across every market, including hardware, subscriptions, and software, as well as market-specific feature and settings configuration. * Merchant Intelligence Service — a centralized platform that aggregates merchant data from across the SumUp ecosystem, helping teams understand the full merchant journey through product adoption, hardware sales, health signals, support interactions, and marketing cohorts. By building these services, the squad is solving a company-wide challenge: product and merchant data is currently fragmented across multiple systems and teams, creating duplication, inconsistency, and reliance on manual workarounds. The Merchant Intelligence squad is building the platform foundations that will help teams across SumUp move faster and make better decisions with reliable, centralized data. As a Senior Backend Engineer, you’ll help design and build these services from the ground up. You’ll work closely with product, data, and engineering teams across SumUp to create scalable systems that are reliable, easy to integrate with, and valuable to a broad range of internal users.   What you’ll do: * Design, build, and evolve foundational backend services that create a shared source of truth for product and merchant data across SumUp, with a strong focus on scalability, reliability, and ease of adoption by internal teams * Develop and maintain robust APIs, data models, and integration patterns that enable teams across the business to access consistent and trustworthy product and merchant information * Build and improve data ingestion, aggregation, and event-processing pipelines that bring together signals from across the SumUp ecosystem into actionable merchant intelligence * Contribute to shaping the long-term architecture and strategy for the Product Catalogue and Merchant Intelligence services, helping establish platform capabilities that can be used across multiple systems and teams * Write high-quality, maintainable backend code following engineering best practices for testing, observability, and production readiness * Collaborate closely with product managers, data teams, and engineers across SumUp to identify needs, solve complex data challenges, and turn them into effective technical solutions * Work across squad and domain boundaries to support integrations, improve data consistency, and enable better internal tools, workflows, and merchant experiences * Help define engineering standards, technical direction, and ways of working in a newly established squad operating in a complex and evolving domain   You’ll be great for this role if you have: * Strong professional experience in backend engineering, building and operating reliable production systems * Solid experience with Golang and designing scalable backend services * Strong knowledge of API design, system design, and data modeling * Hands-on experience with Postgres or similar relational databases * Experience with AWS, Docker, Kubernetes, and infrastructure-as-code tools such as Terraform * Familiarity with event-driven architectures and message brokers such as RabbitMQ or Kafka * A strong ownership mindset, with the ability to work independently and navigate ambiguity * Clear communication skills and a collaborative approach to working across product, data, and engineering teams Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks. 🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education 🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success 💶 A corporate pension scheme where we match up to 20% of your contributions 🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by Company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.   About us: Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.  SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram.   Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

Sumup

At SumUp, the Global Bank team builds the core infrastructure and services that give merchants a digital bank account, helping small businesses manage their money easily and reliably.  The Balance Management Squad sits at the core of the Global Bank Platform. Right now, our team is completing a major milestone: consolidating and modernizing our balance management system in Europe. The next big step is creating a global transaction history service; a single, shared platform used by all regions to give merchants consistent and transparent views of their financial activity. As a (Senior) Backend Engineer, you’ll help modernize existing systems while balancing innovation with stability, collaborate with teams across regions, and build reliable services that manage diverse markets with different regulations. If you enjoy solving complex problems on high-load systems, are curious about banking, and are looking for a team that tackles challenges head-on, we’d love to hear from you. What You’ll Do * Build and evolve the SumUp’s core banking services that powers ledger operations and transactions, transforming our regional systems into a unified, scalable global platform. * Tackle complex distributed systems challenges, ensuring resilient services that continue to perform under high transaction volumes. * Support modernization initiatives by improving observability, adding test coverage, refactoring code for long-term maintainability, and gradually introducing new architectural patterns without disrupting live banking operations. * Contribute to key architectural decisions - build ledger and transaction history systems from the ground up, ensuring a globally scalable banking solution for our clients. * Collaborate with teams across Risk, Treasury, Finance, and Infrastructure to ensure smooth, compliant, and reliable global operations * Take ownership from design to production, running the services you build, monitoring their performance, and continuously improving how we deliver high-quality software at scale. You’ll be great for this role if * You have solid backend experience building reliable, high-volume services and you think carefully about system design, APIs, data modeling, and how services interact. * You are proficient in Golang and comfortable learning and working with other languages as needed, e.g. Kotlin or Elixir. * You write maintainable, well-tested code, follow CI/CD best practices, and take responsibility for the software you build from development to production. * You’re comfortable building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes. * You’re eager to learn about relational databases that perform well under load and maintain data consistency. * You are a collaborator who enjoys working across regions, communicating clearly, exchanging feedback effectively, and making thoughtful technical decisions together. * You have a curiosity for building reliable financial services and banking domain It’s a plus if you have * Knowledge of Elixir - some of our legacy services are written in Elixir, and while it's not essential, it would be useful if you've worked with it before * Deeper PostgreSQL experience - we rely heavily on Postgres, so if you've done performance tuning, complex queries, or schema design, that's a plus * Experience with event streaming platforms (Kafka preferred) and modern observability stacks (Grafana, Honeycomb, etc.) Why you should join SumUp * Be part of a company that values diversity and celebrates unique perspectives. * Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth. * Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of SumUp merchants all over the world * Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR) * Sabbatical program for tenured SumUppers * Join a global team where you belong: Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more * Health & wellness benefits: in-house fitness classes, gym in the office, subsidized Urban Sports Club and available psychotherapy sessions * A lot of other benefits such as Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform/courses etc. * Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing a vast set of simple and affordable business tools to help them start, run, and grow their businesses. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster an inclusivity and continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram. Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

MOIA

JOIN US AS A (SENIOR) BACKEND ENGINEER (ALL GENDERS) IN OUR VEHICLE MISSION TEAM ON A SHARED JOURNEY THAT MATTERS!  To make the vision of an autonomously driving mobility service a reality, the teams in our Vehicle Integration domain develop the applications and tools needed to enable autonomous passenger management within our MOIA vehicles in a world without a driver: How do passengers authenticate themselves in an autonomous vehicle? How do we ensure a safe cabin during boarding and the ride? Which content should be displayed on the vehicle screens to provide a safe and informative user experience for the passenger?    The Vehicle Mission team addresses these challenges by building the mission control backend that orchestrates autonomous vehicle operations. The team develops the orchestration of driving tasks to autonomous vehicles, coordinates passenger boarding workflows, and ensures reliable communication between backend systems and on-vehicle components. This includes integrating with external self-driving system providers and providing test infrastructure and tools for autonomous vehicle development.  The team has the necessary roles to take full responsibility for the given value streams: from backend and embedded developers to quality specialists, cyber security experts and product owners. Join the team if you want to solve these challenges in an agile and customer-driven environment.   WHAT YOU WILL DO * Research and develop passenger management systems for autonomous mobility services  * Bridge the data flow of the AWS-based backend infrastructure and the in-vehicle components using AWS IoT services (e.g., commands, events, metrics, logs) * Develop and improve the backend services used to orchestrate a vehicle’s mission * Work in a bottom-up managed, autonomous, cross-functional team together with other talented engineers * Participate in the full development life cycle, from design to implementation, quality assurance and maintenance * Integrate AI coding assistants in the development process  * Interface with VW Group, vendors, and other partners to align software interfaces, tooling, and hardware WHAT WILL HELP YOU TO FULFILL YOUR ROLE  * Proficiency in Typescript, or another modern typed programming language used on the backend  * Experience with AWS IoT and Serverless technologies, ideally such as Lambda, DynamoDB, and SQS * Familiarity with communication protocols used to connect edge devices, such as MQTT * Experience with CICD tools such as Github Actions or AWS CodeBuild * General interest in embedded development * Knowledge of current trends in software design, event-driven architecture, DevOps, and a strong interest in further development * Interest in applying agile development practices and a proactive, flexible, and hands-on mindset We encourage you to apply even if your profile only meets some of the requirements for the role since we are looking for a diverse range of experiences, skills, and interests. We are certain that there will be something for everyone because we are working on such a variety of tasks and embrace individual growth at MOIA. OUR BENEFITS IN A NUTSHELL * Competitive salary (including bonus)   * Hybrid work setup: Work from home or one of our offices - you and your team decide how often to meet, blending flexibility with collaboration!  * Flexible working hours and the possibility of flexible work arrangements depending on your needs (parenting, care work, volunteering, etc.)  * Budget and monthly expense allowance for home office setup  * Possibility of remote work from outside Germany for up to 6 weeks per year from over 35 countries - learn more in our blog! * Public transport ticket (fully subsidized "Deutschlandticket") for commuting and travelling throughout Germany and discount on MOIA rides * Subsidized fitness club membership or bike leasing  * Learning environment with continuous learning days, job rotation, trainings and workshops, coaching, conferences, books, and language classes  * Mental health support, 1:1 sessions with external professionals and mental unload workshops  * 30 vacation days, sabbatical and unpaid leave option  * Relocation support with service provider (visa, administration, etc.)  * Dog-friendly offices For student & internship positions, we have an adjusted set of benefits. You can find them here.  BE WHO YOU ARE! We are a member of Charta der Vielfalt and are dedicated to actively fostering a workplace that celebrates and promotes diversity in various aspects such as age, gender identity, race, sexual orientation, physical or cognitive ability, and ethnicity. At MOIA, we embrace a culture where people are accepted, respected, valued, appreciated, and included. In our commitment to promoting diversity and inclusivity, we regularly provide unconscious bias training to all our employees. Furthermore, we continuously strive to enhance our hiring process by ensuring a diverse hiring panel. HOW WE WORK At MOIA, our teams are typically distributed across our office locations and collaborate in a hybrid setup. We work together both remotely and on site, choosing the mode of collaboration that fits the context, the work at hand, and each team’s rhythm. Spending time together in our offices is an important part of how we stay connected, build trust, and solve complex problems. At the same time, we value flexibility and give teams and individuals autonomy to shape their ways of working, with everyone having the freedom to organise their routines in a way that aligns with their work and their team’s needs. If you’d like to learn more about how we work, visit our blog for insights into our culture and hiring process, or follow us on Instagram for a look behind the scenes at MOIA. WHO WE ARE At MOIA we’re reimagining the future of mobility – safe, autonomous and tailored to the needs of cities and their people. As a tech company with more than 400 employees, we build mobility solutions that truly move cities forward. We launched our ridepooling service in Hamburg in 2019 and have been part of the city’s public transport system since 2023. Since launch, we have transported over 12 million passengers. Currently, MOIA is evolving from a mobility provider to a tech provider offering a scalable and safe turnkey solution for autonomous driving.  With office locations in Berlin and Hamburg, our diverse and international team comprising more than 60 nationalities works together toward that shared mission.  MOIA is more than a technology provider – we are a partner to cities and public transport operators committed to creating more livable spaces and delivering mobility solutions that are reliable, safe and comfortable. YOUR APPLICATION TO MOIA We value authenticity and personal insights in your application responses. While AI tools can be useful, we encourage you to answer the following questions based on your own experiences and understanding. This helps us keep a human touch and better evaluate your unique perspective and match for the role. To reinforce an unbiased screening process, we kindly ask you not to include your picture, age, address, or any other details unrelated to your qualifications and suitability for the role. Additionally, we anonymize applications during the initial review phase by removing personally identifiable information. This ensures that our evaluation focuses solely on your skills, experience, and potential – supporting a fair and inclusive hiring experience for all candidates.