Senior Backend Engineer at SumUp | Sofia, Bulgaria

About the Team: As a Senior Android Engineer in the Mobile Platform Squad, you will play a crucial role in the foundation of Mobile Engineering at SumUp. Your team is tasked with developing and maintaining an environment that empowers Mobile Developers to efficiently deliver high-quality products. Additionally, you will provide assistance and support to SumUp employees interacting with our mobile applications. We foster an engineering culture rooted in autonomy, collaboration, and innovation. You will liaise with mobile engineers across the organization as your initiatives will have a widespread impact. The squad is focused on: Maintaining CI/CD pipelines for mobile projects. Creating tools and infrastructure to enhance the developer experience. Supporting and optimizing the codebase across SumUp's mobile applications. Driving long-term technical improvements at scale across the organization. What You Will Do: Shape the core experience for merchants and developers using SumUp’s Android ecosystem. Develop and maintain tools, frameworks, and infrastructure that enhance the consistency, scalability, and reliability of our mobile applications. Collaborate with cross-functional teams, including product management, design, and backend development, to deliver seamless user experiences. Work on CI/CD systems, developer tools, and performance enhancements to streamline mobile development processes. Mentor team members and provide technical guidance across various projects. Uphold high engineering standards and continuously elevate them by introducing new technologies and best practices. Take ownership of technical projects from conception to implementation, ensuring alignment with business objectives and technical standards.

At SumUp, we are dedicated to empowering small businesses by providing technology that is flexible, fair, affordable, and user-friendly. Every day, millions aspire to launch their own ventures, and we are committed to assisting them in this journey. Our overarching goal is to facilitate lasting connections between businesses and their customers by 'closing the loop' on transactions.We are excited to announce an opening for a Legal Counsel to join our EU Legal Team.Key Responsibilities:Deliver comprehensive legal support in employment law and commercial contracts, responding effectively to daily inquiries from our business and customers across the EU.Establish trusted relationships as a key member of the Global Legal team, interacting with various internal stakeholders within SumUp's diverse tribes and teams.Draft, review, and negotiate a variety of business contracts, including those with hardware and logistics providers, marketing agreements, and vendor contracts.Offer legal guidance on employment and corporate law matters across Europe, while preparing internal labor documentation, policies, and procedures.Stay abreast of relevant laws, regulations, and industry practices to provide strategic legal advice on various projects.Collaborate with colleagues in legal, finance, tax, compliance, and privacy, working closely with business teams.Oversee contract management through the company’s tools and systems.

Are you driven by the desire to leverage technology and controls to create meaningful change? At SumUp, we are seeking a dedicated IT Internal Auditor to elevate our Internal Audit team in Sofia. In this pivotal role, you will play a key part in ensuring our IT framework is secure, compliant, and capable of supporting millions of businesses globally. About SumUpSumUp is a prominent global fintech company focused on leveling the playing field for small enterprises. Since our inception in 2012, we have built trust with over 4 million merchants across 36 markets worldwide. Our mission is to simplify business operations and make them affordable by providing tools that assist entrepreneurs in getting paid, managing finances, and enhancing customer relationships. Team DescriptionYou will be integrated into our Internal Audit team, reporting directly to the Global Head of Internal Audit. This team is crucial in protecting SumUp's operations, ensuring adherence to regulatory standards, and fostering continuous improvement throughout the organization. Your focus will be on enhancing our IT audit capabilities, which are vital components of our audit strategy and risk management framework. What You’ll DoLead and execute IT-centric internal audits to ensure SumUp’s systems and controls align with regulatory and business standards.Enhance audit efficiency by analyzing data: execute queries, extract information from systems, and implement advanced analytics.Craft a focused IT audit plan, guiding our evaluation of technology risks across the organization.Convert audit findings into clear, actionable recommendations and present them confidently to management and stakeholders.Serve as an independent advocate for control and compliance, building trust while navigating challenges and driving change.Foster strong relationships with stakeholders to promote a culture of proactive internal controls.Stay informed about evolving IT standards, regulations, and best practices.

At SumUp, we celebrate the everyday heroes who possess the courage to pursue their passions and the determination to turn their dreams into reality. Our mission revolves around empowering small business owners with innovative, user-friendly financial solutions that simplify the management of their enterprises. With a founder's mentality and a 'team-first' attitude, our diverse teams across Europe, South America, and the United States collaborate to ensure that these entrepreneurs can thrive in their endeavors. The Global Bank team at SumUp is responsible for developing the foundational infrastructure and services that provide merchants with digital bank accounts, enabling them to manage their finances efficiently and reliably. Within this team, the Balance Management Squad is pivotal. We are currently nearing a significant milestone: the consolidation and modernization of our balance management system in Europe. Our next ambitious project is to establish a global transaction history service—a unified platform that offers merchants consistent and transparent insights into their financial activities across all regions. As a Backend Engineer, you will play a crucial role in modernizing existing systems while balancing innovation and stability. You will collaborate with teams across various regions to build reliable services that can navigate diverse markets with unique regulatory requirements. If you are passionate about solving complex problems in high-load systems, have a curiosity for banking, and are eager to join a team that embraces challenges, we would love to connect with you.

At SumUp, we champion the everyday heroes—those with the courage and determination to pursue their passions and realize their dreams.We place small business owners at the center of our mission, crafting powerful and user-friendly financial solutions designed to empower them in managing their businesses. With a founder's mentality and a collaborative, 'team-first' spirit, our diverse teams across Europe, South America, and the United States unite to ensure that small business owners can thrive in their endeavors.About the TeamThe Payments Reporting team is integral to SumUp’s financial infrastructure, developing systems that millions of merchants depend on daily to reconcile, report, and make sense of their finances. We are currently on an exciting journey to build a reporting platform that accommodates both external integrators and internal teams at scale, delivering functionalities from file-based exports to real-time API reporting. This role has emerged due to our ambitious growth outpacing the capacity of our current team of three backend engineers, and we need someone who can take significant ownership of complex backend tasks, allowing the team to accelerate critical architectural improvements.What You Will DoDevelop and maintain backend reporting features, including Payout Reports, Payment Reports, Fee Invoices, and Transaction Reports.Design and manage Reporting APIs (like Transaction History and Payout History) that cater to both external integrators and internal stakeholders.Lead the migration of core payments functionality from legacy systems, modernizing the infrastructure that supports our reporting platform.Ensure the operational health of reporting services through effective monitoring, incident response, and performance optimization.Actively engage in planning and refinement sessions, providing technical assessments and effort estimations.Mentor junior engineers through code reviews, collaborative sessions, and knowledge sharing.

About SumUp At SumUp, we empower the everyday hero—those with the courage to pursue their passion and the determination to achieve their dreams. Our mission centers around small business owners, and we are dedicated to creating powerful, user-friendly financial solutions that help them thrive. Our diverse teams, spanning Europe, South America, and the United States, work collaboratively to ensure that small business owners can succeed in doing what they love. Your Team Join our Finance & ERP Engineering team, a vital group responsible for constructing and maintaining the SAP infrastructure that drives SumUp’s financial, logistics, and compliance functions across various markets. This team is integral to some of SumUp’s most significant initiatives, including electronic invoicing across EU countries, field sales enablement, and automation of accounting and tax processes to support SumUp’s readiness for an IPO. As a Junior SAP Developer, you'll collaborate closely with seasoned SAP developers, functional experts, and business stakeholders. You will be trained to understand SumUp’s SAP landscape thoroughly, contribute to real production systems, and progressively enhance your technical ownership while ensuring that mission-critical finance systems operate seamlessly. Explore our vibrant Sofia hub here Sofia Office What You’ll Do Learning & Training (first months) Engage in hands-on onboarding into SumUp’s SAP landscape (S/4HANA, Fiori, CPI, BTP) Understand our clean code principles, development standards, and delivery practices Observe senior developers to grasp business processes in finance and logistics Developing & Contributing Develop and maintain SAP programs, reports, and interfaces with guidance Assist in testing, debugging, and quality assurance of SAP applications Contribute to building and enhancing SAP Fiori applications Work on integrations with other systems (e.g., Kafka, Snowflake, Salesforce) Document development work clearly and consistently Progressing Your Impact Take ownership of small projects and contribute to larger initiatives

Join SumUp as a Backend Engineer specializing in Go within our Payments Experience team. In this role, you will be instrumental in building and optimizing backend services that power our payment solutions. You will collaborate with cross-functional teams to enhance user experience and ensure seamless transactions.

At SumUp, we recognize that small businesses are the driving force behind Europe's economy. Our mission has always centered around empowering these businesses to flourish. We are now embarking on an exciting new venture: a stablecoin designed to ensure payments are instant, cost-effective, and fully compliant with regulations.This is a unique opportunity to contribute to a product that sits at the convergence of fintech, cryptocurrency, and regulatory compliance, supported by a profitable organization that serves over 4 million merchants across 35+ markets.What’s the opportunity?We are seeking a Senior Backend Engineer who is passionate about building innovative solutions from the ground up. This role is ideal for someone who thrives in fast-paced environments and desires to enhance their technical skills in a high-impact field. You will collaborate closely with our Staff Engineer and cross-functional teams to bring our stablecoin project to fruition.This newly created position is pivotal for a high-priority project. It entails a dynamic, complex environment filled with learning opportunities, perfect for an individual who enjoys tackling challenging problems and delivering high-quality code.Your responsibilities will include:Building from the ground up: Participate in technical discovery and MVP development for SURO, coding daily in Kotlin or Go.Designing reliable systems: Assist in creating high-SLA, service-oriented systems that integrate with our ledger, reconciliation, and treasury platforms.Delivering quality: Write clean, maintainable code with a focus on reliability, security, and observability.Collaborating across teams: Work alongside Product, Finance, Legal, and Banking teams to ensure features comply with regulatory standards.Expanding your skills: Learn from seasoned engineers and deepen your expertise in payments, compliance, and blockchain technologies.Owning features end-to-end: Take full responsibility for specific components from design through deployment and monitoring.

Join KIPMI Software, a pioneering company born from TINQIN, which has been at the forefront of innovative software solutions for the insurance sector for over a decade. As part of the Be Ys Group, we are venturing into the realms of digital trust and identity technologies. We invite you to be a part of our dynamic team focused on developing next-generation digital trust products.Let's build the future of technology together!Key Responsibilities:Design, build, and deploy web services and applications utilizing Docker and Kubernetes in both Azure and on-premises environments.Develop and manage CI/CD pipelines using GitLab and Azure DevOps.Implement Infrastructure as Code practices with Terraform and Ansible.Ensure high availability and performance for SQL/NoSQL databases, APIs, and front-end services.Set up monitoring and alerting systems using Prometheus, Grafana, Loki, and ELK stack.Automate operational workflows and runbooks with tools such as Rundeck, Ansible, or custom scripts.Collaborate closely with product and development teams, leading troubleshooting efforts and providing technical support.Qualifications:Bachelor's degree in Computer Science, Engineering, or a related field.Robust experience in technical roles involving engineering, development, or operations.Proficient in Kubernetes and Docker with strong hands-on experience.Experienced in Linux system administration.Familiarity with at least one scripting language (e.g., Bash, Python).Experience with CI/CD tools such as GitLab CI or Azure Pipelines.Practical knowledge of Infrastructure as Code using Terraform and Ansible.Preferred Skills:Knowledge of the Java ecosystem (Java, Spring Boot, JDBC, Maven).Experience with Azure Cloud or OpenStack environments.Familiarity with GitOps workflows and identity management.Understanding of Agile methodologies and collaboration with developers and product teams.What We Offer:Competitive salary package.A stimulating and engaging work environment.Opportunity to work with cutting-edge technologies on real projects.Collaboration with a team of skilled and friendly professionals.Continuous learning and professional development opportunities.Corporate training and tech conference participation.Annual performance reviews and evaluations.Fun team-building events.

Join Our Mission to Empower Wealth BuildingAt trading212, we are revolutionizing the trading and investing landscape by crafting innovative products that resonate with our users.We champion a culture of excellence and agility, driving our success in a rapidly evolving market.Currently, we proudly serve over 4.5 million clients, managing more than €30 billion in assets—a true testament to the trust we have established in just a few years.Your RoleDesign and implement solutions with a comprehensive understanding of business challenges, our service architecture, and the relevant technologies and infrastructure.Be involved in every phase of the software development lifecycle (SDLC)—from gathering requirements and designing implementation to coding, testing, deploying, and monitoring. You will take full ownership of your code and ensure its continuous improvement.Develop robust solutions focused on performance, scalability, and resilience—your code will operate in a high-stakes environment where downtime, latency, and data loss are unacceptable.Collaborate within small, autonomous teams that operate on short release cycles. We value agile methodologies and a balanced approach to processes that avoid chaos without compromising speed.Engage in knowledge sharing and continuous learning with colleagues. As our company evolves, so must we, and constructive feedback is one of our strongest tools for growth. QualificationsProven experience in developing services within a microservice architecture, having contributed to a highly scalable and performant system comprising over 200 microservices.Strong understanding of common communication protocols. You should be adept at utilizing HTTP/WebSockets and AMQP, with the ability to choose the appropriate protocol based on the context.Familiarity with at least one widely-used web framework, regardless of programming language. Our language-agnostic system empowers engineers to select the most suitable language for specific tasks. We strive for a harmonious balance between cutting-edge technologies and proven solutions.A comprehensive understanding of system performance, scalability, and security best practices.

ABOUT TIDEAt Tide, we empower small and medium-sized enterprises (SMEs) to optimize their operations, saving both time and money. We provide not only business accounts and banking services but also a comprehensive suite of user-friendly administrative solutions ranging from invoicing to accounting.Tide is revolutionizing the small business banking sector with over 1.8 million members worldwide, including regions such as the UK, India, Germany, and France.By leveraging cutting-edge technology, we design all solutions with SMEs in mind. With rapid onboarding processes, minimal fees, and innovative features, we thrive on making data-driven decisions to fulfill our mission: to enable SMEs to focus on what they love.Tide Facts:Available for SMEs in the UK, India, Germany, and FranceOver 1.8 million members: 800,000 in the UK and 1,000,000 in India, with rapid growthSecured over $300 million in fundingMore than 2,500 diverse employees globallyHeadquartered in Central London, with a technology and member support center in Sofia, Bulgaria, and additional offices in Serbia, Romania, Lithuania, Hyderabad, Gurugram, New Delhi, Berlin, Paris, and Luxembourg.ABOUT THE TEAM:Our engineering team, comprising 40+ dedicated professionals, is focused on designing, developing, and managing a rich product catalog across various business domains (e.g., Payment Services, Business Services). With an extensive roadmap ahead, we constantly face exciting challenges. We trust our engineers to make impactful technical decisions that influence multiple teams and shape the future of Tide's Global One Platform. This is a unique chance to significantly contribute by taking ownership of engineering practices within a rapidly growing company!Our engineers work in small, autonomous teams dedicated to specific domains, overseeing the entire lifecycle of various microservices within Tide’s service catalog. They self-organize, collaborate to tackle technical challenges, and establish their own guidelines within the different Communities of Practice, regardless of their current position in our Growth Framework.ABOUT THE ROLE:Engage with our event-driven microservice architecture, which currently includes over 200 services managed by 40+ teams. You will be responsible for defining and maintaining the services your team owns (you design, build, run, and scale them globally).

Join Our Team at Kaizen Gaming!At Kaizen Gaming, the driving force behind Betano, we proudly stand as one of the largest GameTech companies globally, with operations in over 20 markets. Our mission is to harness cutting-edge technology to deliver exceptional entertainment experiences to our millions of satisfied customers.Our diverse workforce boasts more than 2,700 talented individuals from over 40 nationalities, spanning three continents. We are thrilled to be recognized among the Best Workplaces in Europe and certified as a Great Place to Work across all our offices. Here, every day is an opportunity for growth and innovation. Are you ready to Press Play on Your Potential?The RoleDesign, build, and maintain efficient, reusable, and reliable code.Develop interfaces between components of heterogeneous subsystems in a high-volume, transaction-oriented production environment.Ensure optimal performance, quality, and responsiveness of applications.Identify bottlenecks and bugs, devising effective solutions to complex challenges.Technology StackOur services primarily utilize C# / ASP.NET, with newer applications developed in .NET Core. The front-end employs Vue.js for new projects, while legacy systems use server-rendered (Razor) views alongside jQuery and Knockout.js. For data storage, we predominantly use MS SQL Server, supplemented by Redis and ElasticSearch when appropriate. RabbitMQ serves as our preferred message broker, and we rely on Gitlab for version control and CI, complemented by the Atlassian suite for ticketing and documentation.What You’ll BringA minimum of 1 year of development experience with C# / ASP.NET / MVC (full framework or .NET Core).A foundational understanding of web technologies, including HTTP.Experience with data access through databases and APIs.Familiarity with unit testing is an advantage.Perks of Working with Us Hybrid working model. Onboarding support from a dedicated buddy. Competitive salary and bonus structure.‍ Comprehensive private health insurance for you and your family. Monthly meal allowance. Access to a multi-sport card. Additional vacation days.⭐ A developmental 360° feedback framework. Unlimited access to Udemy and ongoing training opportunities.

Join Us in Empowering Wealth CreationAt trading212, we are redefining the landscape of trading and investing by crafting innovative products that resonate with users. Our commitment to excellence and rapid execution has been pivotal to our growth.Currently, we proudly support over 4.5 million clients, managing more than €30 billion in assets—an impressive reflection of the trust and scale we’ve achieved in just a few years.Your Role and ResponsibilitiesTake a comprehensive approach to problem-solving, integrating business challenges, service architecture, and the technological landscape into your solutions.Lead the full software development lifecycle (SDLC), from requirements gathering and design through coding, testing, deployment, and monitoring. You will own your code, ensuring it remains robust and optimized for enhancements when opportunities arise.Design for performance, scalability, and resilience, ensuring your code operates flawlessly in a demanding environment where downtime, latency, and data loss are unacceptable.Collaborate within small, autonomous teams with rapid release cycles, leveraging agile methodologies to maintain high velocity while preserving necessary processes.Engage in continuous learning and knowledge sharing within the team, as our growth is contingent on the company’s collective evolution and constructive feedback. What We Expect from YouA solid understanding of common communication protocols, with comfort in using HTTP, WebSockets, and AMQP, alongside the ability to discern appropriate application contexts.Experience with at least one widely-used web framework, regardless of programming language. Our technology-agnostic platform allows engineers to choose the most suitable language for specific tasks, balancing cutting-edge solutions with proven technologies.A strong grasp of RDBMS concepts, including indexing, transactions, isolation levels, and locking mechanisms, with the skills necessary to design high-performance databases.

Join our talented team at devexperts as a Backend Engineer, where you'll play a pivotal role in developing cutting-edge software solutions. Your expertise in backend technologies will help us enhance our products and provide exceptional service to our clients.

If you're passionate about EKO Bulgaria and eager to join our dynamic team but can't find a position that aligns with your expertise and experience, we encourage you to submit your application. We would love to learn more about you!

At bunq, we prioritize the safety of our users' finances. As a Reporting Agent, you will play a vital role in identifying, reporting, and preventing fraudulent activities to protect our community. Your mission is to enhance our reporting operations and ensure compliance with local regulations, all while making life easier for our users Take OwnershipYour key responsibility is to safeguard our users by promptly identifying suspicious activities and reporting them according to legal and regulatory standards In your role as a Reporting Agent within the User Quality team, you will:Ensure compliance by reporting suspicious activities to relevant Financial Intelligence Units (FIUs) and adhering to country-specific financial crime reporting protocols.Develop clear procedures and continually refine reporting processes through gap analysis and automation, enhancing scalability, accuracy, and regulatory compliance.Monitor reporting performance using analytics tools such as Retool, Looker, and Google Sheets while managing all outstanding CAP items within established deadlines.

About the RoleThe Accounts Payable Specialist will play a crucial role in executing departmental activities and ensuring the smooth operation of our global financial processes. This position is essential for supporting payroll tasks and managing accounts payable operations across our diverse international presence, including the United States, Bulgaria, Panama, Ireland, the United Kingdom, and India. You will leverage your exceptional organizational and analytical skills to foster the continuous growth of our dynamic company by mastering the payroll intricacies of each country and collaborating with both internal and external stakeholders. A-LIGN will rely on you to support management through thorough data audits, payroll processing, invoice management, and the execution of critical journal entries and reconciliations that uphold our financial integrity.

SumUp is hiring a Senior Software Engineer with deep Golang expertise to join the Payments Platform team in Sofia, Bulgaria. This team develops and enhances scalable payment solutions that form the foundation of SumUp’s core products. Key responsibilities Work closely with fellow engineers to design and implement features for the Payments Platform Write, review, and maintain high-quality Go code Focus on improving the platform’s performance and reliability Contribute to technical decisions that impact the future direction of payments at SumUp Requirements Professional experience working with Golang Proven background in building scalable backend systems Interest in payments technology and a commitment to platform reliability Strong collaboration and communication abilities

At SumUp, our mission is to empower small businesses across the globe by simplifying their operations and enabling their success. As a pioneering FinTech company, we are committed to establishing the first global card acceptance brand, and we are already supporting small businesses in over 31 countries worldwide.If you are eager to join a global team dedicated to business partnership and innovation, this could be the ideal opportunity for you.Become a part of our vibrant international Customer Support team, focusing on Risk & Fraud prevention. Our team spans across four continents, working collaboratively to ensure the safety and success of our clients.