Java Principal Engineer

WHO WE ARE:From our humble beginnings as a startup, we have transformed into a global fintech powerhouse, boasting a workforce of over 3,000 individuals from 80 diverse nationalities across 22 offices worldwide. Our rapid growth and diversification are unmatched.At SumUp, we empower businesses to receive payments effortlessly, manage orders swiftly, sell online seamlessly, and optimize their financial operations. Our mission is to equip businesses with the necessary tools to enhance both their operations and customer experiences.THE TEAM:Our advanced payments processing platform, which encompasses a variety of sub-platforms, has been the backbone of SumUp's global operations for more than a decade. A vital part of this platform is our Payouts team, dedicated to ensuring that our millions of merchants receive their payments reliably. This entire ecosystem is developed in Sofia by the Payments Tribe, consisting of several autonomous, cross-functional squads, each responsible for their segment of the platform from start to finish.We are currently in an exhilarating phase of scaling up and enhancing our existing products, while also innovating new solutions. Your contributions will be pivotal in refining and co-creating our existing and new microservices architecture, addressing complex scaling and development challenges where scalability and high availability are paramount.Join a team that prioritizes strong engineering principles and impactful solutions. You will play a significant role in the design and development of our new Java-based payout platform, utilizing cutting-edge technology to influence our product directly.OUR TECH STACK:Java (minimal setup, Spring Boot), Kafka Streams, PostgreSQL/RDBMS, RestEasy, VueJS.

About Man GroupMan Group is a leading global alternative investment management firm dedicated to delivering superior performance for our sophisticated clients through our Systematic, Discretionary, and Solutions offerings. Leveraging exceptional talent and cutting-edge technology, our investment strategies encompass both single and multi-manager approaches, supported by extensive research and spanning public and private markets across major asset classes, with a strong emphasis on alternatives. We prioritize building deep partnerships with our clients, creating customized solutions to achieve their investment objectives for the millions of retirees and savers they serve.Headquartered in London, we manage $227.6 billion* and operate in numerous offices worldwide. Man Group plc is publicly traded on the London Stock Exchange under the ticker EMG.LN and is part of the FTSE 250 Index. For additional information, please visit www.man.com.* As of 31 December 2025The TeamOur team is currently experiencing significant investment aimed at optimizing the trading capabilities across AHL, Numeric, and Discretionary teams. The engineering team collaborates closely with the Trading Desk and the Execution Research team to design, develop, and maintain a world-class trading capability. We operate trading floors in London, Hong Kong, Boston, and New York, managing over $8 trillion annually.We are consistently broadening the markets, asset classes, and regions in which we trade while also diversifying our trading styles. Our team is tasked with creating innovative and adaptable software and tools to keep pace with these changes.

Our mission is to empower individuals to create wealth.At Trading 212, we are transforming the landscape of trading and investing by developing outstanding products that our users adore.Our dynamic team is composed of highly motivated individuals who pursue excellence and cherish autonomy.With over 4.5 million clients and more than €30 billion in assets under management, our growth and trust in the market speak volumes about our success.We are in search of passionate and experienced Principal Software Engineers to drive innovation and scalability in our systems.

With over a decade of experience, TINQIN has consistently provided cutting-edge software solutions specifically tailored for the insurance sector, earning the trust of numerous long-standing clients and partners.As a proud member of the Be Ys Group, TINQIN has extended its expertise into the emerging domains of digital trust and identity technologies. This rapidly expanding product line is now developing into a dedicated company, KIPMI Software. We are currently in search of a Senior Java Software Engineer to join our dynamic team dedicated to advancing these next-generation digital trust products.Be a part of our journey to shape the future of technology!

Welcome to Kaizen Gaming!At Kaizen Gaming, the driving force behind Betano, we stand as one of the leading GameTech companies globally, operating across 19 dynamic markets. Our commitment is to harness the latest technological advancements, delivering unparalleled experiences to millions of customers who rely on us for their entertainment.With a vibrant team of over 2,700 Kaizeners from more than 40 nationalities across three continents, we embrace diversity and innovation.Proudly recognized among the Best Workplaces in Europe and certified as a Great Place to Work, we promise that every day here is unique and filled with potential. Are you ready to Press Play on your career?About the Role:As a Lead Principal Backend Engineer, you will be pivotal in designing and evolving high-performance, scalable backend systems. We seek a technical expert who excels in leadership and mentorship, guiding engineers at all levels. Your expertise will drive the development of our robust software solutions while collaborating with cross-functional teams to achieve excellence.Your Responsibilities Include:Architecting & Innovating: Partner with our agile team to create scalable, secure, and high-performing backend systems that power our innovative solutions.Code Craftsmanship: Write clean and efficient code that serves as the backbone of our technology stack.Mentorship: Inspire and mentor fellow tech leaders, fostering skill development and the adoption of best practices.Performance Optimization: Spearhead initiatives to identify and enhance system performance, ensuring seamless user experiences.Integration Collaboration: Work closely with cross-functional teams to guarantee smooth system integration.Tech Trendsetter: Stay ahead of technological trends, applying emerging technologies to augment our capabilities and disrupt the industry.Best Practices Advocate: Collaborate with Principal Engineers to establish company-wide best practices and foundational software development processes.Strategic Vision: Define and concentrate on the technical roadmap, aligning it with the company's long-term goals beyond immediate business needs.

Welcome to Kaizen GamingAt Kaizen Gaming, the driving force behind Betano, we rank among the world's leading GameTech companies, operating seamlessly across 19 diverse markets. Our mission is to harness the latest technological advancements to deliver unparalleled experiences to the millions of customers who rely on us for their entertainment.With a vibrant community of over 2,700 team members from more than 40 nationalities spread across three continents, we embrace diversity and innovation. Our #oneteam ethos has earned us recognition as one of the Best Workplaces in Europe and the prestigious Great Place to Work certification across our offices. Are you ready to Press Play on Your Potential?About the RoleAs a Principal Engineer within our Technology department, you will play a pivotal role in shaping our frontend strategies. Your expertise will guide teams in crafting elegant, high-performance solutions to real-world challenges. You will mentor them in coding, testing, debugging, and performance analysis, while conducting thorough code reviews to ensure quality and efficiency.In this role, you will be at the forefront of developing cutting-edge applications using modern technologies. Your focus will include executing our technical roadmap, emphasizing code modularity, reusability, and testability. You will also be responsible for performance tuning and monitoring, while providing vital technical guidance to our development teams, ensuring adherence to best practices and design patterns. Collaborating closely with UI/UX designers, you will elevate the user experience for our customers.Our Technology StackWe leverage a robust tech stack, including Vue.js 3, TypeScript, VueX, Pinia, Tailwind, Webpack, Vite, Storybook, Jest, Vitest, Openshift, and private npm packages to develop our internal shared libraries, alongside a micro frontends architecture.As a Principal Frontend Engineer, your responsibilities will include:Coding alongside engineers, demonstrating technical leadership by addressing root causes and leading by example.Understanding key frontend performance metrics, with experience in debugging frameworks like Lighthouse and ChromeUX.Exerting technical influence across multiple teams, mentoring individuals on advanced technical issues, and assisting technology managers in fostering team member growth.Collaborating with Product and Delivery teams to build scalable solutions that meet non-functional requirements regarding performance, security, and reliability.

At Brandwatch, we are committed to empowering every individual to make a significant impact. Your voice is valued here, and your unique insights contribute to our collective success. As part of our global team, you'll flourish in an environment that fosters curiosity, collaboration, and innovation, while making meaningful contributions to the brands we support.Join us in redefining the future of communication and building authentic connections that matter. Whether you are tackling complex challenges or spearheading bold innovations, your growth is synonymous with our success. Together, we will create the conversations of tomorrow.Empower your impact at Brandwatch. Be seen, be understood, be you.Brandwatch is actively seeking a dedicated member for the Measure team. You will join a cross-functional and autonomous product team responsible for delivering solutions for performance monitoring and analytics across major social media platforms including Facebook, Instagram, Twitter, LinkedIn, TikTok, and YouTube.As a Backend Engineer at Brandwatch, you will work with the latest Long-Term Support (LTS) versions of Java and Spring, interfacing with some of the most influential social networks globally. You will consume and store data from their APIs at scale, creating REST APIs that expose vital social media KPIs to our clients. Additionally, you will design and implement a scalable microservice architecture.

Join our dynamic team at arhs as a Senior Java Developer specializing in Liferay DXP. We are seeking an experienced professional to contribute to impactful public sector projects for a European Institution. In this role, you will be pivotal in developing a robust, large-scale platform designed for high performance and scalability, efficiently managing extensive document volumes within a distributed, cloud-based environment.YOUR ROLE:Design, develop, and maintain web applications utilizing Java 17 and Liferay DXP.Contribute to the creation of a scalable, responsive platform hosted on Azure and Kubernetes through microservices and REST APIs.Collaborate with developers, business analysts, and architects to deliver high-quality solutions.Ensure UI elements created in Liferay (using CSS/HTML/JS/React) are intuitive and adhere to modern web standards.Engage in code reviews, update technical documentation, and support CI/CD processes.Actively participate in performance optimizations and the evolution of the architecture.We prioritize in-person collaboration to foster learning and relationships with clients and peers. We are committed to providing flexibility to accommodate your work/life balance.

Join NielsenIQ as a Principal Data Scientist and play a pivotal role in shaping the future of data analytics. In this position, you will leverage advanced analytics and machine learning techniques to derive actionable insights from complex datasets, driving strategic decision-making across the organization.

Join our dynamic team at Accedia as a Junior Java Developer! We are seeking a passionate Java software developer who is eager to learn, collaborate with others, and grow within an innovative environment.What You'll Experience:Engage in a supportive atmosphere working with international clients, encompassing a wide variety of project domains and technology stacks throughout the entire software development lifecycle. This includes developing new features, enhancing existing functionalities, troubleshooting issues, participating in testing, and creating documentation.Collaborate closely with developers of various expertise levels to analyze technical requirements, propose architectural solutions, estimate efforts, and plan tasks effectively.Maintain active communication regarding tasks, requirements, challenges, and open questions with both your team and clients.Advance your skills by learning new technologies, participating in knowledge-sharing initiatives, and pursuing professional certifications.

Join our dynamic team at arhs as a Senior Java Developer and play a pivotal role in enhancing a high-impact public sector project for a prestigious European Institution. In this position, you will be instrumental in the development of a large-scale, high-visibility platform that prioritizes performance, availability, and scalability, managing a substantial volume of documents within a distributed, cloud-based architecture.Key Responsibilities:Design, develop, and maintain cutting-edge distributed applications utilizing Java 17, Spring, Elasticsearch, and Liferay DXP.Contribute to the evolution of a scalable, responsive platform hosted on Azure and Kubernetes, employing microservices and REST APIs.Collaborate closely with fellow developers, business analysts, and architects to deliver top-tier solutions.Ensure that all Liferay customizations adhere to modern web standards.Participate in code reviews, update technical documentation, and support CI/CD processes.Actively engage in performance optimizations and the progressive development of the architecture.This role requires in-person collaboration to foster learning, relationship-building, and teamwork with clients, colleagues, and communities. We strive to offer flexibility to meet your individual work/life balance needs.

At Trading 212, our commitment is to democratize investing, making it accessible for everyone. We have grown from a visionary idea into a trusted platform, serving over 4.5 million clients and managing more than €30 billion in assets.Our culture of excellence and rapid pace propels us to create intuitive, impactful products that empower individuals to enhance their financial well-being. We believe investing should be straightforward, meaningful, and inclusive.Role OverviewAs a Lead Principal Product Designer, you will spearhead design initiatives within a pivotal product area, articulate a visionary user experience, and craft user-centric, elegant solutions that resonate with millions.Collaboration with product managers, engineers, and fellow designers will be key as you tackle intricate challenges, drive strategic projects, and elevate design standards and quality.Your ResponsibilitiesLead the design strategy and implementation for a significant product domain.Create seamless end-to-end customer journeys that simplify complex financial tools, making them enjoyable and accessible.Produce high-quality design deliverables including concepts, wireframes, high-fidelity UIs, and prototypes.Facilitate cross-functional collaboration to gather insights, ensure alignment, and enhance decision-making.Advocate for data-informed design choices that significantly enhance customer satisfaction and engagement.Establish and uphold exceptionally high design standards.Mentor and nurture fellow designers, sharing your expertise to foster team growth.Your QualificationsOver 8 years of experience in developing impactful digital products.An impressive portfolio demonstrating advanced product thinking and the ability to simplify complex systems.Robust interaction and visual design skills, with a keen eye for detail.Exceptional communication and storytelling abilities to engage stakeholders effectively.Proven track record in using both quantitative and qualitative insights to drive product performance.Experience in developing and enhancing design systems.Background in leading projects from conception to completion or executing major redesigns.

With over a decade of experience, TINQIN has been at the forefront of delivering state-of-the-art software solutions tailored for the insurance sector, earning the trust of many long-standing clients and partners.As a proud member of the Be Ys Group, TINQIN has broadened its horizons to encompass cutting-edge digital trust and identity technologies. This rapidly advancing division is now transitioning into a standalone entity, KIPMI Software. We are excited to announce that we are seeking a Principal DevOps Engineer to join our dedicated team focused on developing next-generation digital trust products.Join us in shaping the future of technology!

Join Playtech as a Java Architect and play a pivotal role in shaping our software architecture. You will be responsible for designing scalable and efficient systems, collaborating closely with cross-functional teams, and ensuring the highest quality of code and performance. If you are passionate about technology and eager to make an impact in the gaming industry, we want to hear from you!

Join a leading Technology Solutions Provider and Systems Integrator in Southeastern Europe, specializing in comprehensive solutions for the Banking, Retail, and Telecommunications sectors. We are seeking a skilled C++/Java Software Developer to enhance our team and contribute to the design, development, and maintenance of cutting-edge software solutions. At printec, we prioritize the growth and development of our employees, fostering a supportive environment that values diversity, openness, and teamwork. You'll have the chance to engage in innovative projects within a dynamic international business setting, while honing your skills to reach your personal and professional aspirations. Main Responsibilities: • Design, develop, and maintain software applications. • Work on C++ and Java/Android projects. • Implement new customer requirements and features. • Participate in code reviews and address bugs effectively.

Become a pivotal part of our team as a passionate Java Developer and advance your career in a vibrant, rapidly evolving industry.This role provides an exciting opportunity to work on a significant internal product that is essential for processing and acquiring transactions from diverse sources, including POS systems, E-commerce platforms, Software POS solutions, and banking institutions. Enhance your expertise in an international, fast-paced environment while achieving your professional goals.As a Java Developer, you will engage in a variety of tasks as a member of our agile DevOps team, contributing to various phases (including but not limited to development, user acceptance testing, implementation, and support) of a project aimed at implementing a cutting-edge “omni-channel” payment infrastructure capable of accepting transactions from multiple endpoint devices.Key Responsibilities:- Actively engage in all stages of software product development, encompassing development, code reviews, testing, documentation, and deployments.- Participate in the development of the infrastructure, which includes coding, testing, deploying, and managing payment systems, as well as updating and patching applications.- Diagnose and resolve complex issues across all environments.

Join our innovative PowerCurve Collections Software Engineering Team as a Full-Stack Software Engineer. In this role, you will contribute to our advanced debt management system, empowering clients to optimize their collections strategies and enhance their decision-making processes. You will create customizable and user-centric features that solidify our leadership in the market. Your Responsibilities:Design and implement scalable full-stack solutions utilizing Java and Angular.Produce clean, efficient, and thoroughly tested code.Maintain and enhance automated testing to guarantee software quality.Conduct code reviews to uphold coding standards and best practices.Participate in technical design and estimation discussions.Identify and resolve issues to deliver tangible business value.Foster knowledge sharing to promote team growth and engineering excellence.

Join our innovative team at Sutherland as a C++/Qt/QML & Java Developer! This fully remote position allows you to contribute to exciting projects from anywhere in Bulgaria. You will be instrumental in developing high-quality software solutions, collaborating with cross-functional teams, and ensuring the delivery of exceptional user experiences.

As part of our continuous expansion, we are eager to connect with technology experts and keep an open line for future prospects and exciting projects. This is a talent pool opportunity in Portugal, where we are currently welcoming spontaneous applications to establish a robust pipeline of proficient professionals for when relevant positions arise.We are actively seeking talented Java Backend Developers who are interested in joining our Research & Development teams for future opportunities.Our teams are responsible for developing and maintaining high-performance, low-latency platforms utilized by thousands of users globally every day. The backend services we create manage intricate business processes such as order processing, validation, routing, data reconciliation, and performance-critical calculations. We prioritize code quality, reliability, and scalability, achieving this through meticulous design, peer reviews, and thorough testing. Our engineers operate in multicultural, distributed teams, collaborating with QAs, frontend developers, business analysts, and product stakeholders in an agile (Scrum/Kanban) environment.Technologies We Work With:Core Java (11+): Collections, Streams, Threads, Concurrency, JVM tuningFrameworks & Tools: Spring, JUnit5, AssertJ, MockitoInfrastructure: Docker, PostgreSQL, Liquibase, SplunkCollaboration & CI/CD: Atlassian suite, Slack, TeamCity, SonarOur Work Culture:We are passionate about coding in Java and delving into the underlying mechanics (threads, collections, memory, JVM).We utilize solid computer science foundations to address complex challenges with efficient solutions.We are committed to writing clean, maintainable, and well-tested code.We transform ideas from concept to production and celebrate our achievements together.We foster a collaborative, supportive, and feedback-driven environment across cultures and time zones.We communicate in English (B2+).