Fullstack Backend Engineer (Node.js) at SumUp | Copenhagen

Join SOUNDBOKS, a cutting-edge technology firm and vibrant lifestyle brand renowned for our innovative Bluetooth speakers and audio-reactive lighting solutions. Whether at music festivals, street gatherings, or private celebrations, we transform moments into unforgettable memories with our powerful sound systems.At SOUNDBOKS, we foster a culture of trust and collaboration. Our team members are empowered to take ownership of their projects while receiving unwavering support from their colleagues. Every voice matters, and we believe that collective ideas drive our success.This role is more than just a job; it’s an opportunity to be part of a passionate community where we uplift each other, celebrate achievements, and dedicate ourselves to creating meaningful experiences. With a dynamic team of 70, SOUNDBOKS is a place where you can excel and feel a true sense of belonging.ROLE: Mechanical EngineerTEAM: Product DevelopmentHOURS: Full TimeLOCATION: CopenhagenSTART DATE: June 1st, 2026 or as soon as possibleThe Product Development team oversees the entire product lifecycle, from conceptualization to mass production. Our collaborative and driven team members possess a broad understanding of various disciplines and take ownership of their responsibilities, making a significant impact on our products, the team, and our customers.As a Mechanical Engineer at SOUNDBOKS, you will engage in the mechanical development of our products, closely collaborating with the Lead Mechanical Engineer, the Product Development team, Quality Assurance, and external partners in Asia. Leveraging your engineering expertise, you will assist in developing mechanical engineering (ME) concepts and help convert innovative ideas into precise mechanical assemblies, ensuring compliance with Design for Manufacturing (DFM) standards. You will work with internal stakeholders, partners, and suppliers to ensure a smooth transition from product conception to mass production while upholding high-quality standards and contributing to an exceptional customer experience.Here’s a snapshot of your daily responsibilities:Mechanical Design & PrototypingEngage in the mechanical development of new SOUNDBOKS products.Contribute to the enhancement of industrial design...

Join SOUNDBOKS, a pioneering tech company and vibrant lifestyle brand known for revolutionizing live experiences. Our products have been featured at music festivals, street parties, and private gatherings, delivering festival-quality sound paired with captivating, beat-reactive lights. We pride ourselves on creating the loudest, most resilient, and arguably the coolest Bluetooth speakers and audio-reactive lights available today.At SOUNDBOKS, we believe in fostering a culture of trust and community. Every team member is empowered to take ownership of their work, supported by a collaborative environment where ideas are valued, and teamwork is essential for success.More than just a job, working at SOUNDBOKS means being part of a community that celebrates achievements, cares for one another, and shares the passion for creating something truly impactful. With a dynamic team of 70, we offer a workplace where you can excel and feel a sense of belonging.ROLE: Lead Firmware EngineerTEAM: Product DevelopmentHOURS: Full-timeLOCATION: Copenhagen, DenmarkSTART DATE: June 1st, 2026, or earlierThe Product Development team at SOUNDBOKS is at the forefront of our exciting product evolution, steering the development process from concept to mass production. Our collaborative team comprises self-motivated individuals with diverse expertise and a commitment to making a substantial impact on our products and customers.As the Lead Firmware Engineer, you will spearhead firmware development across all SOUNDBOKS products throughout various stages of product development. You will work closely with cross-functional teams to ensure that product firmware integrates seamlessly from electronic architecture to application, manufacturing, and testing.Here's a glimpse of your daily responsibilities:Firmware Development & Architecture:Lead firmware development and architectural design for our current and upcoming product lines.Design and implement modular embedded software utilizing real-time operating systems (FreeRTOS, Zephyr).Create drivers and BSP across various chipsets and peripherals (I2S, I2C, SPI, UART, USB), ensuring the integration of new hardware.Exploration of New Technologies:Investigate and assess new firmware-related technologies to enhance product performance.

SOUNDBOKS creates Bluetooth speakers and audio-reactive lights designed for music festivals, street parties, and private events. The company’s mission centers on delivering powerful, durable, and stylish audio products that help people make lasting memories. Based in Copenhagen, SOUNDBOKS values trust, community, and collaboration. Team members are encouraged to take ownership of their work, share ideas openly, and support one another. With about 70 people on the team, SOUNDBOKS celebrates achievements together and aims to build products that matter. Role Overview Title: Lead Audio Engineer Team: Product Development Hours: Full time Location: Copenhagen N, Hovedstaden, Denmark Start Date: September 2026 or as soon as possible The Product Development team guides products from initial idea to mass production. This group works closely together, bringing a mix of skills and a strong sense of ownership to every project. The focus: improve SOUNDBOKS products and the experience for every customer. What You Will Do The Lead Audio Engineer leads audio design for SOUNDBOKS speakers. This role uses deep knowledge of acoustics and audio processing, along with hands-on development skills, to shape the company’s sound experience and system efficiency. Working with mechanical and hardware engineers, the Lead Audio Engineer helps achieve clear sound, long battery life, and cost-effective production. Key Responsibilities Develop new audio concepts for future speaker systems. Work with Hardware and Mechanical teams to design audio solutions. Test and validate new concepts through prototypes and proof-of-concept builds. Run acoustic simulations to improve speaker performance and system output.

Managing spend can often be a complex and frustrating task. At Pleo, we are revolutionizing this process. We develop innovative spend management solutions that empower finance teams and employees, making financial operations smooth and surprisingly effective. Our mission is to help businesses achieve more than they thought possible.The name ‘Pleo’ translates to ‘more than you’d expect’, and this philosophy has guided us to success over the past decade.As we embark on this exciting journey, every decision we make affects our 40,000+ customers and contributes to our collective success. We seek passionate individuals who excel at identifying customer needs, simplifying complex challenges, and pushing boundaries—always with respect and ambition. With over 850 team members from more than 100 nationalities, we are dedicated to transforming the future of business spending together.About the RoleWe are in search of a Backend Engineer to join our dynamic team at Pleo. In this pivotal role, you will contribute to the development and scaling of our backend systems while engaging in exciting projects that enhance our product and service offerings. If you are enthusiastic about tackling intricate technical problems and thrive in a culture that prioritizes transparency, collaboration, and innovation, this position is ideal for you.What You’ll Be DoingAs a Backend Engineer at Pleo, your responsibilities will include:Designing, building, and maintaining scalable microservices primarily using Kotlin.Collaborating with cross-functional teams to develop innovative solutions across various domains, including Platform and Services.Analyzing system performance and implementing optimizations to ensure high reliability and scalability.Participating in code reviews and post-mortems while providing mentorship to fellow engineers.Proactively addressing technical debt and guiding the team through technical challenges and migrations.What You BringTo excel in this role, you should possess:Experience in server-side programming, particularly in Kotlin, along with familiarity with distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes).A solid understanding of relational databases and system design principles.

Airapps seeks a React Engineer to join the team in Copenhagen. This position centers on building web applications that enhance user experience and encourage engagement. Collaboration is a key part of the role, especially with design and product teams to bring new ideas to life as dependable, high-quality features. Responsibilities Develop and maintain web applications using React Work closely with designers and product managers to implement new features Ensure applications perform well across a range of devices and browsers Location This role is based in Copenhagen.

Location: Copenhagen, Denmark About the Team The Global Bank tribe at SumUp builds financial tools designed to help small businesses manage their finances with confidence. The team’s main products, Expenses and Making Tax Digital (MTD), form a core part of SumUp’s accounting and compliance suite. Right now, the team is preparing to launch MTD in the UK, enabling merchants to submit Income Tax assessments electronically. The broader vision includes developing a full suite of accounting tools, covering Income Tax, VAT submissions, and financial reporting for multiple markets. Role Overview This Fullstack Engineer position sits within the Expenses and MTD squad. It is an early-stage, high-impact role where contributions directly shape the direction of new products. The work supports SumUp’s push to offer comprehensive accounting solutions to small businesses in the UK and beyond. What You Will Do Drive end-to-end delivery of features across both frontend and backend systems Work closely with two senior engineers, a Product Manager, a Designer, and an Engineering Manager Collaborate with a global network of 200 professionals, ensuring your work reaches a wide audience Who You’ll Work With The squad includes experienced engineers, product, and design colleagues. The team operates with the backing and resources of SumUp’s global organization, offering both autonomy and support.

Join our dynamic team at airapps as an iOS Engineer. In this role, you will be instrumental in designing and developing high-quality mobile applications that deliver outstanding user experiences. You will collaborate with cross-functional teams to define, design, and ship new features, while ensuring robust performance and responsiveness of our applications.

Kubapay seeks a Support Engineer in Copenhagen to assist customers with payment solutions. The position centers on technical support and troubleshooting, ensuring clients receive timely help when issues arise. Key responsibilities Handle customer inquiries and technical questions about Kubapay products Identify and resolve problems to keep clients operational Offer clear, practical support so customers can use Kubapay services effectively Location This role is based in Copenhagen, Capital Region of Denmark.

Join our innovative team at airapps as a Release Engineer, where you will play a crucial role in enhancing our software deployment process. You will collaborate with cross-functional teams to ensure the smooth and efficient release of our applications.As a Release Engineer, you will be responsible for maintaining and improving our CI/CD pipelines, automating build processes, and ensuring that all releases meet quality standards. Your technical expertise will be vital in troubleshooting issues and implementing best practices.

About HappyRobotHappyRobot is an innovative AI-native operating system designed to transform the real economy by bridging the gap between intelligence and action. Our platform integrates real-time data, specialized AI agents, and orchestrating intelligence to empower enterprises to manage complex and mission-critical operations autonomously.By optimizing knowledge, enhancing efficiency at every operational level, and evolving continuously, we focus on supply chain and industrial-scale operations, where resilience, speed, and constant improvement are paramount. This enables our clients to allocate their human resources towards strategic, creative, and high-value endeavors.Discover our vision by visiting our Manifesto. To date, HappyRobot has secured $62 million in funding, including a recent $44 million Series B round in September 2025. Our esteemed investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10—partners who share our commitment to redefine enterprise operations. We are channeling this investment into creating a world-class team of driven individuals with exceptional problem-solving abilities and a passion for innovation in a fast-paced environment. If our mission resonates with you, you will thrive at HappyRobot.Role OverviewWe are seeking a dynamic and highly skilled Forward Deployed Engineer to join our team. This role blends technical expertise with outstanding communication skills, working closely with customers to ensure they derive maximum value from our AI platform. Your responsibilities will include onboarding, implementation, and ongoing support, alongside contributing to product development and innovation.At HappyRobot, we operate without seniority or hierarchy—our team is built on collaboration. We execute, innovate, take ownership, and genuinely care about our clients' success.

D-ploy is a leading provider of IT and Engineering Solutions with a strong presence across EMEA, including countries such as Switzerland, Germany, Czech Republic, Austria, the UK, and the USA. We pride ourselves on delivering cutting-edge IT services and solutions to top-tier clients, emphasizing reliability, efficiency, and fostering long-term partnerships that drive IT productivity and business value.We are in search of a dedicated IT Onsite Support Technician to provide exceptional support to end-users in a professional and regulated environment in Copenhagen.

Veo stands at the forefront of AI-driven sports camera innovation. Our groundbreaking, fully automated camera system empowers sports teams to effortlessly capture their matches and training sessions without the need for a camera operator. We are on a mission to democratize sports by providing video analysis tools to teams at every level, making what was once a luxury accessible to all. Each week, over 40,000 clubs across more than 90 countries utilize our technology to record their games.What distinguishes us? It's our remarkable team. We are a diverse collective of innovative thinkers, creators, and problem-solvers dedicated to delivering exceptional products while enjoying the journey.Join Our Team As an iOS Engineer at Veo, you will be instrumental in elevating our mobile application. Located in Copenhagen, you will work hand-in-hand with product managers, designers, and fellow engineers to create outstanding user experiences that integrate seamlessly with our hardware and platform ecosystem.This is your chance to influence the future of a product that is revolutionizing how sports are captured, viewed, and shared, all within a dynamic, collaborative, and mission-driven environment.At Veo, you will be part of a team of passionate, talented individuals who value both their craft and each other.

Join Our Dynamic Team At Hitachi Vantara, our dedicated services teams are highly regarded by customers, partners, and stakeholders for their critical role in nurturing customer relationships. We represent Hitachi Vantara to enterprise clients across various industries, fostering strong business connections to understand and address customer challenges effectively, ensuring we deliver unparalleled value. As part of our global customer support organization, we collaborate closely to maintain high levels of customer satisfaction. In the role of Customer Engineer (CE) within Customer Service & Support (CS&S), you will be stationed in Denmark and will primarily support our customers in the Nordics, including Sweden, Finland, Norway, and Denmark. Our team works in tandem with the Global Customer Support (GSC) organization, which provides round-the-clock support to our global clientele. Your ResponsibilitiesIn this role, you will deliver technical support, manage accounts, perform problem analysis, and assist with installations for Hitachi Vantara customers throughout the Nordics. While you may occasionally visit customer sites, you will also ensure that our Nordic partners receive the necessary remote support prior to and during their onsite visits. You will collaborate with sales and presales teams to guarantee optimal solutions and services for all customers. Each day is unique, combining remote work with on-site responsibilities. Flexibility to accommodate varying hours is essential, as customer needs dictate interaction and response times. You may be required to work evenings, weekends, and be available for on-call duties. Your technical focus will include Hitachi block, file, and content storage solutions, as well as SAN (Storage Area Network) technologies from Brocade and Cisco. What You Bring to the Team• Extensive experience in technical support or related field teams for major IT vendors, with expertise in troubleshooting SAN/storage issues and supporting associated infrastructure. Experience in storage firmware upgrades and maintenance is essential.• Familiarity with major storage vendor support structures, online support tools, knowledge databases, and escalation protocols.• Proficiency in major operating systems such as Linux, VMware, and Windows is advantageous.• A customer-focused, structured, and service-oriented mindset, with the ability to remain composed in fast-paced environments.• Excellent communication skills in English.• A valid B-class driver’s license.

Join Veo, a global frontrunner in AI-powered sports camera technology! Our revolutionary, fully automated camera system empowers sports teams to effortlessly record matches and training sessions without the need for a camera operator. We are on a mission to democratize sports, providing video analysis capabilities to teams at every level—an advantage previously reserved for the elite. Each week, over 40,000 clubs across more than 90 countries capture their games with our technology. At Veo, our rapid growth means that no two days are the same—each day brings new challenges and exciting opportunities, both in our operational and back-office roles.However, what truly sets us apart is our exceptional team. We have attracted some of the brightest minds in the industry, driving our ability to innovate and create outstanding products while enjoying the journey.As a Machine Learning Engineer at Veo, you will tackle complex challenges and play a pivotal role in enhancing our AI-driven end-user products.You will become a key member of our AI team, consisting of 15 talented researchers and engineers dedicated to all facets of the machine learning lifecycle across various projects—from defining data annotation tasks to modeling, validation, and deployment. You will have the autonomy to steer the direction of your projects, while also receiving constructive feedback and collaborating with your teammates to foster improvement and success.We are committed to staying abreast of the latest research, engaging in discussions about contemporary concepts and ideas in recent publications, assessing their applicability to our tasks and product-specific challenges.We are in search of another ambitious, high-performing machine learning engineer or researcher, ranging from junior to senior levels, with demonstrated experience in real-world machine learning projects. Familiarity with computer vision is advantageous but not mandatory.

At Veo, we are at the forefront of revolutionizing sports technology with our cutting-edge AI-powered sports camera systems. Our fully automated camera solutions empower sports teams to capture their matches and training sessions effortlessly, without the need for a camera operator. We are democratizing access to video analysis for teams at every level, a benefit that was once reserved for a select few. Each week, over 40,000 clubs across more than 90 countries rely on our technology to record their games.What distinguishes us is our team. Our diverse group is composed of innovative thinkers, creators, and problem-solvers who are dedicated to delivering outstanding products while enjoying the journey.The RoleWe invite you to join us as a Senior Android Engineer and play an integral role in advancing our mobile application. Located in Copenhagen, you will collaborate closely with product managers, designers, and fellow engineers to create exceptional user experiences that integrate seamlessly with our hardware and platform ecosystem.This is your chance to influence the future of a product that is redefining how sports are recorded, viewed, and shared—all within a dynamic, collaborative, and purpose-oriented environment. At Veo, you will be part of a talented and passionate team that truly values both the work they produce and each other.

Navigating messy spend management can be complicated, but at Pleo, we are transforming this experience. We develop innovative spend solutions that streamline the management of finances, making it effortless and effective for both finance teams and employees. Our vision is to help businesses 'go beyond'.The name 'Pleo' signifies 'more than you’d expect', a philosophy that has driven our success over the past decade.We are currently at a crucial phase in our journey, where each decision we make influences over 40,000 customers and our overall success. We seek individuals who take pride in identifying customer needs, simplifying complex challenges, and respectfully challenging the status quo—all while aspiring for greatness. With our ambitious goals, we acknowledge that we don't have all the answers, and that's part of the excitement! Our team consists of over 850 passionate individuals from more than 100 nationalities, all dedicated to shaping the future of business spending together.About the RoleWe are on the lookout for a Senior Backend Engineer to join our dynamic team at Pleo. In this position, you will be instrumental in building and scaling our backend systems while engaging in exciting projects as we expand our product and service offerings. If you have a passion for addressing complex technical challenges and thrive in a culture that prioritizes transparency, collaboration, and a strong commitment to innovation, this role is perfect for you.Your ResponsibilitiesAs a Senior Backend Engineer, you will:Lead efforts to design, build, and maintain scalable microservices primarily utilizing Kotlin.Collaborate with cross-functional teams to create innovative solutions across various domains, including Platform, Services, and SMB.Evaluate system performance and implement enhancements to ensure high reliability and scalability.Participate in code reviews, conduct post-mortems, and mentor fellow engineers.Proactively manage technical debt and guide the team through technical challenges and migrations.QualificationsYou will excel in this role if you possess:Expertise in server-side programming languages, particularly Kotlin, along with experience in distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes).Proficiency with relational databases such as PostgreSQL.

OverviewAt Corti, we are dedicated to revolutionizing access to medical expertise, ensuring that everyone can receive high-quality healthcare, regardless of their location.Despite advancements, a significant portion of the global population still lacks access to effective healthcare. In many regions, healthcare outcomes are inconsistent, and medical professionals are often overwhelmed by the increasing volume of information and cases.Our AI platform is designed to bridge this gap, enhancing access to medical knowledge, minimizing errors, and allowing healthcare professionals to focus on what matters most—patient care. We aim to make healthcare more affordable, accessible, and human-centric.We believe that quality healthcare is rooted in meaningful dialogue, and reliable AI systems require a solid foundation. Join us in building both.Why Join Corti?Corti is at the forefront of creating the intelligence layer for global healthcare. We empower developers, product teams, and innovators in healthcare with access to medical-grade AI, enabling the delivery of faster, safer, and more personalized care.Our models are meticulously trained on real-world data, focusing on precision, safety, and regulatory compliance, specifically tailored for healthcare and related industries.With our modular APIs, teams can seamlessly integrate medical speech recognition, summarization, reasoning, and other functionalities into their healthcare products, eliminating the need to start from scratch.We are the driving force behind innovators who are reshaping healthcare, from startups enhancing patient experiences to established enterprises modernizing essential systems. If you share our belief that AI specifically designed for medicine will shape the future of healthcare, Corti is the right place for you.The RoleAs a Senior Platform Engineer, you will play a pivotal role in advancing our multi-tenant Kubernetes infrastructure, ensuring it can efficiently manage over 100,000 concurrent streams. Your work will also focus on streamlining our engineers' workflows, enhancing their productivity through innovative solutions.Key Responsibilities:Collaborate closely with product and engineering teams to ensure our systems are scalable, reliable, and performant.Develop and implement automation tools and processes to enhance the efficiency of our development and operations teams.Architect our platform to ensure it scales effectively with the growth of the company.

Veo stands at the forefront of AI-driven sports camera technology, offering an innovative fully automated camera solution that empowers sports teams to effortlessly record their matches and training sessions without the need for a camera operator. We are on a mission to democratize sports by providing video analysis capabilities to teams at every level, a privilege that was once reserved for the few. Currently, over 40,000 clubs in more than 90 countries utilize our technology to capture their games weekly.What truly distinguishes us? Our team. We are a diverse collective of innovative thinkers, creators, and problem-solvers dedicated to delivering exceptional products while enjoying the journey.The OpportunityWe invite you to join Veo as a Senior iOS Engineer, where you will play a pivotal role in enhancing our mobile application. Based in Copenhagen, you will work in close collaboration with product managers, designers, and fellow engineers to create outstanding user experiences that seamlessly integrate with our hardware and platform ecosystem.This role offers a chance to influence the future of a product that is revolutionizing the way sports are captured, viewed, and shared—all within a dynamic, collaborative, and purpose-driven environment. At Veo, you will become part of a skilled and motivated team that deeply values both the quality of what they build and the relationships they foster.

OverviewAt Corti, we are dedicated to democratizing access to medical expertise for everyone, regardless of their location.Globally, many individuals still face barriers to quality healthcare. In even the most advanced systems, healthcare outcomes can be inconsistent, and clinicians often find themselves overwhelmed. As medical knowledge evolves at a rapid pace, it can be difficult for healthcare professionals to keep up.Corti is at the forefront of bridging this gap through our AI platform, which enhances access to medical expertise, minimizes errors, and allows clinicians to reclaim their time, making healthcare more affordable and humane.Quality healthcare is built on quality dialogue, and reliable AI systems require a strong foundation. Join us in building both.Why Join Corti?Corti is developing the intelligence layer for global healthcare. We empower every developer, product team, and innovator in healthcare with access to medical-grade AI, enabling the delivery of care that is faster, safer, and more humane.Our models are specifically designed for healthcare and closely related industries, trained on real-world data to ensure precision, safety, and regulatory trust.With our modular APIs, teams can seamlessly integrate medical speech recognition, summarization, reasoning, and more into their healthcare products without having to start from scratch.We support the innovators who are transforming healthcare, from startups enhancing patient experiences to established enterprises modernizing critical systems.If you share our belief that purpose-built AI will shape the future of healthcare, we invite you to be part of Corti. The RoleAre you a curious and innovative individual eager to tackle real challenges in healthcare? Do you have a passion for the Golang programming language?If so, we would love for you to join our dynamic, autonomous, and collaborative team culture, which is anchored in shared values, a commitment to quality, and a spirit of experimentation.As a Senior Backend Engineer on our Engineering team, you will play a key role in developing groundbreaking healthcare products. Your focus will be on creating software that supports the medical community through advancements in speech recognition and text generation. Your contributions will help clinicians, nurses, and doctors learn from their interactions and continuously improve their practice. You'll have the opportunity to learn daily from experts in software engineering, machine learning, and data science—are you ready for this adventure?