Senior Backend Engineer

🏢 Summary: Senior Android Developer role focused on building and scaling a Kotlin-based POS mobile application within a SuperApp, contributing to a Kotlin Multiplatform strategy across Android and iOS. The position involves developing new features, improving app architecture, and ensuring high-quality, scalable solutions used globally. The role requires strong expertise in Android development, modern architectures, and testing practices. 🗂️ Requirements: 8+ years of experience in Android mobile development, Strong proficiency in Kotlin, Minimum 2 years of experience with Jetpack Compose, Experience with Kotlin Multiplatform, Knowledge of software design patterns (MVVM or MVI), Experience building modular and scalable app architectures, Experience with reactive programming using Flow and Coroutines, Strong knowledge of testing best practices and writing automated tests 📃 Skills: Kotlin, Android, Jetpack, Compose, KMP, MVVM, MVI, Flow, Coroutines, Concurrency, Testing 🏢 Description: About the team SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones. As a Senior Android Developer , you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. About the role We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps. You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. This role will be a B2B based role in Warsaw. What you’ll do Build new features for the item catalog within the SumUp SuperApp Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making Write thorough documentation and implement robust testing for features before shipping Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms You’ll thrive in this role if: You have 8** + years experience in mobile engineering with Android and Kotlin.** You have 2+ years of experience working with Jetpack Compose. You have a solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures. You have good knowledge of reactive programming (Flow, Coroutines and Concurrency). You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests. You strive for clean code, and you are flexible to balance pragmatism and perfection. You have a keen interest in multi-platform development using Kotlin Multiplatform. Why You Should Join SumUp (Warsaw) 🇵🇱 🌎 Opportunity to work , from our vibrant Warsaw office with inspiring art-filled lounges and a skyline terrace in the Mennica Legacy Tower. 🌈 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 🚀 Enrolment onto our VSOP program: you will own a stake in SumUp’s future success 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team 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.

🏢 Summary: Android Developer role focused on building and evolving SumUp’s POS mobile application within the SuperApp ecosystem, with a strong emphasis on Kotlin Multiplatform strategy. The position involves developing new features, improving architecture, and ensuring scalable, high-quality solutions used across 60+ countries. You will collaborate cross-functionally and contribute to testing, documentation, and technical mentorship. 🗂️ Requirements: 3+ years of experience in mobile engineering with Android and Kotlin, 2+ years of experience with Jetpack Compose, Strong knowledge of software design patterns (MVVM, MVI), Experience building modular and scalable app architectures, Good knowledge of reactive programming (Flow, Coroutines, Concurrency), Strong understanding of testing best practices and writing resilient tests, Interest in Kotlin Multiplatform development 📃 Skills: Android, Kotlin, Jetpack, Compose, MVVM, MVI, Flow, Coroutines, Concurrency, Kotlin, Multiplatform 🏢 Description: About the team SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones. As an Android Developer , you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. About the role We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps. You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. What you’ll do Build new features for the item catalog within the SumUp SuperApp Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making Write thorough documentation and implement robust testing for features before shipping Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms Coach and mentor other engineers You’ll thrive in this role if: You have 3** + years of experience** in mobile engineering with Android and Kotlin. You have 2+ years of experience working with Jetpack Compose. You have a solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures. You have good knowledge of reactive programming (Flow, Coroutines and Concurrency). You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests. You strive for clean code, and you are flexible to balance pragmatism and perfection. You have a keen interest in multi-platform development using Kotlin Multiplatform. Why you should join SumUp: 🌈 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 🚀 Enrollment onto our VSOP program: you will own a stake in SumUp’s future success 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team 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.

🏢 Summary: Android Developer role focused on building and evolving a Point-of-Sale SuperApp using Kotlin and Kotlin Multiplatform. The position involves developing new features, improving app architecture, and ensuring scalable, high-quality mobile solutions across Android and iOS. You will contribute to a shared multiplatform strategy while maintaining robust testing and clean architecture practices. 🗂️ Requirements: 3+ years of experience in Android development with Kotlin, 2+ years of experience with Jetpack Compose, Experience with MVVM or MVI architecture patterns, Experience building modular and scalable mobile architectures, Knowledge of reactive programming using Flow and Coroutines, Experience with concurrency in mobile applications, Strong understanding of testing practices in mobile development, Interest in Kotlin Multiplatform development 📃 Skills: Kotlin, Android, Jetpack, Compose, MVVM, MVI, Flow, Coroutines, Concurrency, KMP, Testing 🏢 Description: About the team SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones. As an Android Developer , you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. About the role We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps. You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. What you’ll do Build new features for the item catalog within the SumUp SuperApp Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making Write thorough documentation and implement robust testing for features before shipping Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms Coach and mentor other engineers You’ll thrive in this role if: You have 3** + years of experience** in mobile engineering with Android and Kotlin. You have 2+ years of experience working with Jetpack Compose. You have a solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures. You have good knowledge of reactive programming (Flow, Coroutines and Concurrency). You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests. You strive for clean code, and you are flexible to balance pragmatism and perfection. You have a keen interest in multi-platform development using Kotlin Multiplatform. Why you should join SumUp: 🌈 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 🚀 Enrollment onto our VSOP program: you will own a stake in SumUp’s future success 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team 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.

🏢 Summary: Three-month full-time accelerator program in Warsaw focused on building and shipping a real MVP in the Sell Online domain, addressing merchant challenges such as onboarding automation and AI-powered tools. Participants work in small product teams, contributing to backend APIs and user-facing features using modern technologies. Top performers receive a one-year contract offer after the program. 🗂️ Requirements: Final-year student or recent graduate in Computer Science, Software Engineering or related field, Experience building at least one full-stack application, Familiarity with Git and collaborative workflows, Hands-on experience with at least one modern programming language (Java, Kotlin, Go, Python or TypeScript), Ability to write clean, testable, well-documented code, Fluency in English 📃 Skills: Kotlin, TypeScript, Java, Go, Python, Git, API, AI 🏢 Description: Build real products that help millions of small businesses thrive. At SumUp, we build fintech tools that empower over 4 million merchants across 37 markets to run and grow their businesses. The Warsaw Accelerator Program puts you at the heart of that mission - working on real product challenges in the Sell Online domain, from reducing merchant onboarding friction to building AI-powered tools that save merchants time and drive revenue. This isn't a traditional internship. From day one, you'll join a small product team, take real ownership of a problem, and ship a working MVP alongside experienced engineers and product mentors. The top three performers will be offered a one-year contract at the end of the programme. 📍 Location: Warsaw, Hala Koszyki (office-first) ⏱  Duration: 3 months, 15th July – 15th October 2026 (full time) 💰 Salary: 8,000 PLN gross per month (Civil Law Contract / Umowa Zlecenie) Curious what that actually looks like? Watch how our Accelerator participantsOpens in new window become contributors to real-world features at SumUp. What you'll work on You'll join one of two teams tackling real merchant problems, including: Reducing onboarding friction by automating merchant setup and data import Building smart waitlist and re-engagement tools to help merchants fill gaps and grow revenue Exploring a consumer-facing marketplace where customers can discover and book services from SumUp merchants Developing AI-powered tools - including a voice-based AI receptionist and a conversational merchant assistant Your impact Working alongside engineering mentors, product leads, and experienced SumUppers, you'll: Design, build, and ship a functional MVP addressing a real merchant problem - from backend APIs to user-facing features Write clean, testable, well-documented code and take part in code reviews from day one Work in weekly sprint cycles, demoing progress every Friday and iterating fast Grow your skills in Kotlin and TypeScript through a hands-on bootcamp in week one, then apply them immediately Present your team's solution on Demo Day to senior engineers and stakeholders across SumUp You might be a great fit if you… Are a final-year student or recent graduate in Computer Science, Software Engineering, or a related field Have built at least one full-stack application - through studies, a personal project, or freelance work Are familiar with Git and collaborative workflows such as branching, pull requests, and code review Have hands-on experience with at least one modern language - Java, Kotlin, Go, Python TypeScript preferred Are curious, self-driven, and learn fast - personal projects, open-source contributions, or online courses are a great signal Are fluent in English, as all programme communication is conducted in English Why join SumUp? Impact with Purpose - Ship products used by millions of small businesses while building next-gen AI tools. This isn't a sandbox. Come As You Are - A workplace that celebrates diversity and fosters an inclusion-first culture. Office Perks - Complimentary lunch every Thursday. Team Culture - Regular social events to connect and unwind. About SumUp Be empowered to build things that matter. 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 37 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 teamOpens in new window of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values and cultureOpens in new window shape everything we do, fostering inclusion, learning and belonging. SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedInOpens in new window , 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.

🏢 Summary: Senior Backend Engineer role focused on building secure backend systems to ensure fiscal compliance of POS products across multiple European markets. The position involves designing and implementing integrations for receipt fiscalization and regulatory reporting within a distributed, cross-functional environment. The role supports international expansion by developing scalable, fault-tolerant backend solutions. 🗂️ Requirements: 5+ years of backend engineering experience, Strong proficiency in Java and/or Kotlin, Solid understanding of system architecture and design principles, Experience with data modeling and API design, Experience building distributed and fault-tolerant systems, Hands-on experience with AWS, Hands-on experience with Kubernetes, Knowledge of Kafka, Knowledge of Postgres, Understanding of CQRS 📃 Skills: Java, Kotlin, AWS, Kubernetes, Kafka, Postgres, CQRS, APIs, Microservices, DistributedSystems 🏢 Description: About the team SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Our Fiscalization team will accelerate making the following countries fiscally compliant: Italy, Sweden, Norway, Belgium, Austria, and many other European countries. They will also start building the path for integrating with third parties and fiscalizing receipts. As a Senior Backend Engineer , you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. About the role You will be working on secure backend systems to ensure our SumUp’s Point of Sale (POS) products are compliant in the different countries in our roadmap. Furthermore, you will work with the Fiscalization squad to understand the challenge in each market to design a unique solution to delivery. You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. This will be B2B role for our team in Warsaw. What you’ll do Build and maintain fiscal compliance solutions to enable SumUp's expansion across Italy, Sweden, Norway, Belgium, Austria, and other European markets. Develop integrations with third-party services for receipt fiscalization and regulatory reporting systems. Navigate SumUp's complex POS ecosystem and master fiscalization frameworks across multiple jurisdictions. Collaborate with distributed squad members and stakeholders across 5+ cities in a hybrid environment. You’ll thrive in this role if: You have 5+ years experience in backend engineering with Java and/or Kotlin. You have a strong understanding of fundamental system architecture, design principles, data modeling, and API design. You have a strong experience with distributed and fault-tolerant systems. You have user-level experience working with AWS and Kubernetes. You have good knowledge of Kafka, Postgres, & CQRS. Why You Should Join SumUp (Warsaw) 🇵🇱 🌈 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 🚀 Enrolment onto our VSOP program: you will own a stake in SumUp’s future success 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team 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.

🏢 Summary: Field Sales role focused on selling payment and loyalty solutions to local businesses, managing the full sales cycle and building a territory-based pipeline. The position offers uncapped commission with base salary, career growth opportunities, and benefits. You will prospect, cold call, and use CRM tools to drive new business and support merchant success. 🗂️ Requirements: 1-5 years of sales experience, Full sales cycle management experience, Territory-based prospecting and canvassing, Cold calling experience, Ability to conduct sales research, Experience using CRM systems, Reliable transportation 📃 Skills: CRM, Sales, Prospecting, ColdCalling, Research, SaaS, Fintech 🏢 Description: SUMUP IS HIRING for the greater Columbus, OH Area... This is a Field Sales role! Who You Are You are a sales professional with 1-5 years of experience, who is bright and driven, looking for a genuine opportunity where you can be with a company for a long time. In fact, you are GREAT, you are going places, so you are looking for a home where your commissions are uncapped, though you also need that base salary to pay immediate bills. You're also looking for somewhere that allows you to move up internally, because you'll need that, and to work with an interesting technical product that actually makes a real difference in the world. You care about helping others and your local neighborhood. You want a start-up atmosphere, but you also want stability in rocky times and good benefits, and you want to work with other great people who are fun and above all make you better than you ever thought you could be. SumUp supports a diverse community of professionals with various backgrounds and lived experiences. There is no "perfect candidate" for this role. We are simply searching for people that are driven to succeed in helping SumUp continue delivering on our values and making our customers successful. A Day In Your Life Armed with a good understanding of the product from training, you will build a sales pipeline by developing relationships with local businesses. We will show you how. You will make their life easier by selling a payment and loyalty solution that turns their small enterprise into the heartbeat of the block. Over 3 million merchants use us because our products are good. This is going to require research however, and cold calling, and knocking on doors, and above all empathy and kindness for your customer's needs. The Role You Would Fill Full sales cycle management including territory based prospecting and canvassing Cold Calling for new business leads Research (play smarter not harder) Use our CRM to track performance and ensure communication and success Your Background 1-5 years of sales experience Reliable transportation Experience in retail, hospitality, B2B and/or SAAS sales is always a plus. If you don't have this, please don't let this stop you from applying Who we are SumUp is a fast-growing fintech firm that helps local families and businesses by allowing them to receive payments quickly and simply, both in-store and online. We are no small cheese because we have over 3000 employees and work in over 34 countries. But most importantly we are relied upon by merchants of all sizes from DHL to taxi drivers. A few details of the role include: Starting Compensation: On-target-earnings (OTE) $107,000 with uncapped commission. Opportunities for advancement and increased compensation based on performance. 22 days of annual PTO plus 11 paid holidays 401K matching Great medical, dental and vision benefits. #SumUpUSA 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.

🏢 Summary: Field-based Outside Sales/Account Executive role focused on managing the full sales cycle for a fintech payment and loyalty solution in the Greater Cleveland area. The position involves prospecting, cold calling, and building relationships with local businesses while using CRM tools to manage pipeline and performance. Offers uncapped commission with OTE of $107,000, base salary, benefits, and advancement opportunities. 🗂️ Requirements: 1-5 years of sales experience, Full sales cycle management experience, Cold calling experience, Territory-based prospecting and canvassing, Ability to conduct sales research, Experience using CRM systems, Reliable transportation 📃 Skills: CRM, SaaS, B2B, Fintech, Salesforce 🏢 Description: SumUp is seeking an Outside Sales/Account Executive for the Greater Cleveland Area! This is a Field Sales Role Who You Are You are a sales professional with 1-5 years of experience, who is bright and driven, looking for a genuine opportunity where you can be with a company for a long time. In fact, you are GREAT, you are going places, so you are looking for a home where your commissions are uncapped, though you also need that base salary to pay immediate bills. You're also looking for somewhere that allows you to move up internally, because you'll need that, and to work with an interesting technical product that actually makes a real difference in the world. You care about helping others and your local neighborhood. You want a start-up atmosphere, but you also want stability in rocky times and good benefits, and you want to work with other great people who are fun and above all make you better than you ever thought you could be. SumUp supports a diverse community of professionals with various backgrounds and lived experiences. There is no "perfect candidate" for this role. We are simply searching for people that are driven to succeed in helping SumUp continue delivering on our values and making our customers successful. A Day In Your Life Armed with a good understanding of the product from training, you will build a sales pipeline by developing relationships with local businesses. We will show you how. You will make their life easier by selling a payment and loyalty solution that turns their small enterprise into the heartbeat of the block. Over 3 million merchants use us because our products are good. This is going to require research however, and cold calling, and knocking on doors, and above all empathy and kindness for your customer's needs. The Role You Would Fill Full sales cycle management including territory based prospecting and canvassing Cold Calling for new business leads Research (play smarter not harder) Use our CRM to track performance and ensure communication and success Your Background 1-5 years of sales experience Reliable transportation Experience in retail, hospitality, B2B and/or SAAS sales is always a plus. If you don't have this, please don't let this stop you from applying Who we are SumUp is a fast-growing fintech firm that helps local families and businesses by allowing them to receive payments quickly and simply, both in-store and online. We are no small cheese because we have over 3000 employees and work in over 34 countries. But most importantly we are relied upon by merchants of all sizes from DHL to taxi drivers. A few details of the role include: Starting Compensation: On-target-earnings (OTE) $107,000 with uncapped commission. Opportunities for advancement and increased compensation based on performance. 22 days of annual PTO plus 11 paid holidays 401K matching Great medical, dental and vision benefits. #SumUpUSA 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.

🏢 Summary: Backend engineer role in a large-scale online payments ecosystem, building and operating high-availability microservices in a cloud-native environment. The position focuses on designing, optimizing, and maintaining distributed systems that power real-time payment solutions and integrations with major payment operators. You will work with modern technologies, own services end-to-end, and solve complex challenges related to scalability, performance, and secure payment processing. 🗂️ Requirements: Proficiency in Kotlin or Java, Willingness to develop expertise in Kotlin, Experience building backend systems, Understanding of distributed systems, Ability to design and optimize high-performance services, English at B2 level or higher 📃 Skills: Kotlin, Java, Spring, Kafka, Kubernetes, Docker, Consul, GitHub, GitHubActions, Microservices, DistributedSystems, DataStreaming, MachineLearning 🏢 Description: About the job: Massive Scale : Design, build, and optimize systems that handle thousands of requests per minute. This is high-availability, high-performance engineering in practice. Modern Tech Stack : Work with a world-class, cloud-native environment. Our core technologies include Kotlin, Spring, Kafka, and Kubernetes. We're not shy when it comes to ML too :) True Ownership & Autonomy : We live by a "you build it, you run it" philosophy. You'll join an agile, autonomous team with full ownership of your microservices, from design to deployment. Complex Challenges : From distributed systems and data streaming to algorithmic optimization, you'll tackle the complex backend problems that power a massive, real-time marketplace. In our department, we focus on online payments. We are building an ecosystem that enables secure, easy, fast, and convenient payments for buyers. We also take care of the seller's side, ensuring they can issue quick refunds or pay their Allegro billing. We provide a range of payment solutions, from bank transfers and BLIK to card payments, Apple Pay, Google Pay, installment products, and many others. In our team, we are directly responsible for integration with payment operators such as PayU and P24, and we cooperate with entities such as BLIK, Visa, and Mastercard. If you want to find out which method buyers use most often, what their biggest problem is when paying, how to securely store payment card data, or how Apple Pay, Google Pay, and BLIK without a code work behind the scenes, join us. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Poznań. We are looking for people who: Code in Kotlin or Java and are eager to master Kotlin by taking part in greenfield projects Expect work that has a deeper meaning (not only tasks "management has commissioned") and want to enjoy its results; Want to be proud of the code they create; they value high-quality code reviews and engage in substantive discussions on software engineering best practices; Can look for effective solutions to the requirements set by users; Want to constantly develop and update their knowledge; Know English at at least B2 level; Have the nature of an explorer. You are not satisfied with superficial answers - you like to "break a problem down into its prime factors" until you understand how something works underneath. Treat learning as a process, not an unpleasant chore. The world of payments is changing dynamically, and you want to stay up to date with every innovation. Are a "driver," not a passenger. See room for improvement? You don't wait for a command; you take the initiative and act. What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism ( see more here ), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here . #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Backend Software Engineer role focused on developing and optimizing Product Catalog solutions, particularly duplicate detection and product grouping at scale. The position involves designing and maintaining backend services and architectures in a cloud-based, microservices environment using Kotlin and JVM technologies. You will work on high-scale systems, contributing to core platform components and automation. 🗂️ Requirements: Commercial experience in Kotlin development, Strong knowledge of backend architectural patterns, Experience designing and maintaining backend services and APIs, Ability to design software architectures, Experience with debugging and resolving software defects, Fluent Polish (C1), English proficiency (B2), Experience working with distributed systems at scale 📃 Skills: Kotlin, JVM, Kubernetes, Docker, Consul, GitHub, GitHubActions, Microservices, APIs, Cloud, Hermes, ServiceMesh 🏢 Description: About the job In this role, you will be a key player in evolving our Product Catalog - the foundational pillar of our platform. Your primary objective will be to build and optimize solutions for duplicate detection and accurate product grouping across a broad portfolio of system components. Your work will directly shape the daily experience of our users. You will ensure Buyers enjoy a high-quality, clutter-free shopping experience, while helping Partners list their products more efficiently. Expect to tackle exciting technical challenges at scale, working with a diverse tech stack that includes online JVM services and offline processing in a public-cloud environment. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN gross 14 600 - 20 825 Annual bonus based on your annual performance and company results. Our team is based in Toruń. What You'll Do: Design, develop, test and maintain high-quality code for backend services, APIs and automation scripts. Debug and resolve software defects and issues. Design and develop new project architectures while proposing better architectural approaches for existing solutions. Share knowledge with team members and support junior engineers. Collaborate with product managers, data analysts, UX designers and fellow engineers to gather and refine requirements. Support on-call engineers by participating in the Software Engineer role on-call rotation. Write clean, efficient  and well-documented code. We are looking for someone who has: Solid commercial experience in Kotlin development and a strong command of backend architectural patterns. Language proficiency in Polish at a C1 level and English at a B2 level. Excellent problem-solving and decision-making skills, paired with a Data-Driven mindset. High learning agility, adaptability to change, flexibility  and strong skills in communication and cooperation. What's in it for you: Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms). A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories. A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers). English classes that we pay for related to the specific nature of your job. A training budget, inter-team tourism (see more here), hackathons, and an internal learning platform where you will find multiple trainings. An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal. Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy. And that's just the beginning! You can read more about the benefits here. #goodtobehere means that: You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA. You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create. You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job. You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support). You will create solutions that will be used (and loved!) by your friends, family and millions of our customers. You will meet the Allegro Scale, which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning. You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about! Send us your CV and… see you at Allegro!

🏢 Summary: Development of the payment domain for a B2B fitness SaaS platform using JVM technologies within a cross-functional, agile team. The role focuses on building and enhancing resilient, maintainable microservices integrated into a scalable, cloud-native environment. You will deliver high-quality backend components using Spring Boot and related frameworks. 🗂️ Requirements: Minimum 3 years of experience in cloud-based software development, Strong experience with JVM technologies, Hands-on experience with Spring Boot, Knowledge of Hibernate, Experience building scalable cloud-native platforms, Experience developing microservices, Ability to apply design patterns in backend systems, Experience working in agile environments, Professional English proficiency 📃 Skills: Java, JVM, SpringBoot, Hibernate, Microservices, Cloud, SaaS, DesignPatterns, Agile, English 🏢 Description: Your position in our team You enhance our payment software solutions as part of a cross-functional team You develop the payment domain of our market-leading B2B fitness SaaS platform in close cooperation with product management and the developer team using JVM technologies and frameworks like Spring Boot. You create high-quality software components in an agile environment and contribute your ideas within flat hierarchies You develop and enhance resilient, maintainable microservices in an agile and autonomous environment and its integration with our SaaS platform Your profile You have at least 3 years of professional experience in developing cloud-based software using JVM technologies, with knowledge of frameworks like Spring Boot and Hibernate. You have experience in working on a scalable, cloud-native platform You focus on delivering high-quality, reliable components with fast deployment cycles, continuously improving yourself You stay up to date with programming trends, thrive in collaborative environments, and communicate confidently in English. You apply proven design patterns pragmatically to build maintainable and efficient backend systems Your benefits with us Benefits package – private medical care and a sports card to support your health and well-being Access to Udemy Business – boost your skills with thousands of high-quality online courses Flexible work model – work fully remotely or combine it with on-site collaboration at our modern office in Warsaw Employment options tailored to you – pick the contract type that best fits your needs Flexible Working Hours – adjust your schedule to fit your lifestyle Unique experience in the Fitness and SaaS industry – join a market-leading company in a dynamic, fast-growing industry International team – work alongside talented colleagues from around the world in a diverse and inclusive environment Unforgettable company events – take part in engaging team-building activities and memorable celebrations