Fullstack Engineer at SumUp | Copenhagen

Role overview airapps is looking for a Site Reliability Engineer (SRE) based in Copenhagen. This role centers on ensuring that systems remain stable, accessible, and responsive as the company grows. The SRE will partner with software engineers to create solutions that support a growing user base and evolving platform needs. What you will do Monitor and maintain the reliability and uptime of core systems Work with engineering teams to develop infrastructure that can handle increased scale Find and address issues that could lead to downtime Support the delivery of services as the platform expands

Do you thrive on ensuring BGP and HA run flawlessly with zero downtime during failover? Are you passionate about taking responsibility, pursuing professional development, and tackling new challenges? At Netcompany, we are seeking a Senior Network Engineer to help drive and enhance our network infrastructure within both data centers and enterprise/campus environments.Key Responsibilities and TechnologiesNetcompany Operations is a well-established operational organization responsible for everything from critical societal and business application management to infrastructure handling in two state-of-the-art data centers.As a Senior Network Engineer, you will join our network team within the broader infrastructure department, delivering stable and secure solutions in our private cloud that supports mission-critical systems. You will engage in the daily operations and maintenance of Netcompany’s networks within our data centers, handling complex and business-critical tasks across all areas of the network domain—aligned with your professional ambition for growth.You will enjoy technical ownership and direct influence over solutions for public and mission-critical clients. Additionally, you will work on security as well as automation and DevOps principles in networking, covering everything from core routing to security and WAN/edge.Your primary tasks will include:Operation, troubleshooting, expansion, and design of networks in data centers and/or enterprise/campus.Security optimization through segmentation, PBR policies, access control, SIEM, and IPS.Operation of Fortigate firewalls, Cisco ASR routers, ACI switch core, and related technologies in data centers.Automation/DevOps and scripting with Python, Ansible, Terraform, GitLab CI/CD, templates, pipelines, and code reviews.Close collaboration with specialists in server, storage, and security—along with the opportunity to set technical direction.About YouYou are driven, deliver results, and take responsibility. You think through solutions, document processes, build standards, and elevate the team. You thrive in taking charge and working methodically.Moreover, we envision that you:Hold a diploma, bachelor’s, or master’s degree—or have a similar level of qualification in IT.Have a minimum of a couple of years of experience in a similar role.Possess basic knowledge of scripting and automation tools.

Join our dynamic team as a Linux Operations Engineer at Netcompany A/S, where you will play a pivotal role in managing and optimizing our Linux-based systems. You will collaborate with cross-functional teams to ensure the seamless operation of our infrastructure, troubleshoot issues, and implement best practices in system administration.Your expertise will contribute to enhancing system performance, security, and reliability, enabling us to deliver exceptional services to our clients.

Jobgether is looking for a Senior Data Engineer based in Denmark. This position centers on building and supporting the data infrastructure that powers analytics and business intelligence across the company. Role overview The Senior Data Engineer will design, develop, and maintain data pipelines and data models. The work ensures that data moves efficiently through the organization and remains accessible for analysis and reporting. Key responsibilities Create and optimize data pipelines for reliable data flow Develop and maintain data models to support analytics needs Support business intelligence by making data accessible and organized Location This role is based in Denmark.

Join our dynamic team at veo as a Senior Platform Engineer, where your expertise will drive the development and optimization of our innovative platform solutions. In this role, you will collaborate with cross-functional teams to design, implement, and maintain robust systems that enhance our products and services.

Join us at Netcompany1 as a Purple Security Engineer, where you will play a crucial role in safeguarding our digital infrastructure. We are looking for a dedicated professional who is passionate about cybersecurity and eager to contribute to innovative security solutions. In this position, you will be responsible for identifying vulnerabilities, implementing security measures, and ensuring compliance with industry standards.

Managing expenses can often be a convoluted process. At Pleo, we're revolutionizing spend management by creating solutions that streamline financial operations, making them empowering and effective for both finance teams and employees. Our mission is to help businesses 'go beyond' traditional spending methods.The term 'Pleo' translates to 'more than you'd expect', and this philosophy has guided our success over the past decade.As we embark on this significant phase of our journey, every decision influences our over 40,000 customers and contributes to our business’s overall achievement. We seek individuals who are passionate about identifying customer needs, simplifying complex challenges, and respectfully challenging the status quo. With our ambitious goals driving us, we recognize that the journey is just as important as the destination.We are a diverse, progressive team of over 850 individuals from more than 100 nationalities, united in our commitment to transform the future of business spending.At Pleo, we strive to make spend management surprisingly effective and empowering. Our product is utilized by thousands of companies across Europe, and our design system plays a crucial role in providing a consistent, accessible, and high-quality user experience.We are looking for a Staff Engineer to join our Design Systems team and help guide the engineering strategy and execution of our design system across both web and mobile platforms.Responsibilities of the Design Systems TeamDevelop and enhance Telescope, Pleo's design system, including components, patterns, guidelines, and tooling.Facilitate faster product delivery by ensuring consistent UI, accessibility, and quality.Collaborate with Design and Engineering teams across the organization to promote adoption and improve the contribution experience.Manage shared foundations such as tokens, components, documentation, and best practices.Your RoleAs a Staff Tech Lead Engineer in Design Systems, you will act as a force multiplier for product delivery and UI quality across Pleo.Define the technical direction for key aspects of Telescope, including architecture, component standards, release practices, and quality benchmarks.Enhance our contribution model and optimize team interactions with Design Systems.Oversee and refine the request process for the team (triage, prioritization, and expectations).Improve the developer and contributor experience through thoughtful enhancements and support.

Navigating the complexities of spend management can be challenging, often leading to cumbersome processes that impact everyone involved, particularly finance teams. At Pleo, we are revolutionizing this space. We create innovative spend solutions that streamline financial management, making it seamless and empowering for both finance professionals and employees, with the vision to help businesses truly 'go beyond'.The name 'Pleo' embodies our ethos of exceeding expectations, a principle that has driven our success over the past decade.As we reach a critical juncture in our journey, every decision we make directly influences our 40,000+ customers, our business trajectory, and our shared success. We seek individuals who take pride in identifying customer needs, simplifying complex challenges, respectfully questioning the status quo, and consistently aiming for excellence. With ambitious goals propelling us forward, we admit that we haven’t mastered everything yet, and that’s part of the excitement! Our team of over 850 talented individuals from more than 100 nationalities is dedicated to shaping the future of business spending together.At Pleo, our mission is to transform spend management into a surprisingly effective and empowering experience.We are currently seeking a Staff Engineer to join our GenAI Core team. You will play a key role in shaping the technical direction of Pleo's AI platform, which provides the foundational infrastructure that enables product teams across the organization to develop AI-driven features reliably and at scale.About GenAI CoreGenAI Core is responsible for the AI platform infrastructure at Pleo. We empower product teams to implement AI-powered features efficiently, reliably, and without duplicating efforts.Our responsibilities include:LLM routing and access: managing a centralized LLM proxy layer (LiteLLM) that directs requests to various model providers (Azure OpenAI, AWS Bedrock, Google Gemini), including budget enforcement and rate limiting.Observability and evaluation: providing integrations and tools (BrainTrust) to monitor, log, and evaluate LLM calls in production, facilitating both automated assessments and human reviews.Setting platform standards and guidelines: we determine the best practices for AI implementation at Pleo, offering patterns, contracts, and shared components for product teams.Internal consulting: as AI capabilities are adopted across Pleo, GenAI Core will increasingly serve as a technical partner, assisting teams in the correct design and implementation of AI features atop our platform.

Join Atom Computing as a Quantum Operations Engineer in the vibrant city of Copenhagen. In this role, you will play a critical part in advancing our quantum computing systems, ensuring optimal performance and reliability. Your expertise in quantum technologies will help us push the boundaries of what is possible in this exciting field.

SOUNDBOKS designs Bluetooth speakers and audio-reactive lights for music festivals, street parties, and private gatherings. The company’s mission is to deliver audio products that combine power, durability, and style, helping people create memorable experiences. Based in Copenhagen, SOUNDBOKS puts trust, community, and collaboration at the center of its culture. The team, about 70 people strong, values open idea-sharing, personal ownership, and mutual support. Achievements are celebrated together, and the focus remains on building products that make a difference. Role overview The Lead Audio Engineer joins the Product Development team in Copenhagen N, Hovedstaden, Denmark. This full-time role starts in September 2026 or as soon as possible. Product Development guides every SOUNDBOKS product from concept through to mass production, working closely as a group and taking pride in improving both the product and customer experience. What you will do The Lead Audio Engineer shapes the audio design of SOUNDBOKS speakers. Deep expertise in acoustics and audio processing, paired with practical development skills, will help define the company’s sound and system performance. Collaboration with mechanical and hardware engineers is essential to achieve clear audio, long battery life, and efficient production. Key responsibilities Create new audio concepts for upcoming speaker systems Partner with Hardware and Mechanical teams to design effective audio solutions Test and validate ideas through prototypes and proof-of-concept builds Use acoustic simulations to enhance speaker performance and system output

Join our dynamic team at Netcompany1 as a Network Engineer where you will play a pivotal role in designing, implementing, and maintaining our network infrastructure. You will collaborate with cross-functional teams to ensure optimal network performance and security.

Join our dynamic team at netcompany1 as an Experienced Linux Operations Engineer. In this pivotal role, you will leverage your expertise to manage and optimize our Linux server environments, ensuring high availability and performance. You will collaborate with cross-functional teams to implement innovative solutions, troubleshoot issues, and enhance system security. If you are passionate about Linux systems and thrive in a fast-paced environment, we invite you to apply and contribute to our mission of delivering top-notch IT services.

Navigating the complexities of spend management can be a daunting task. At Pleo, we are redefining this experience by creating financial solutions that streamline money management for finance teams and employees alike. Our goal is to empower organizations to go beyond traditional boundaries.The name ‘Pleo’ translates to ‘more than you’d expect,’ a philosophy that has fueled our success for over a decade.We find ourselves at a critical juncture in our growth journey; every decision impacts our 40,000+ clients and our overall trajectory. We seek individuals who take pride in understanding customer needs, transforming intricate problems into straightforward solutions, and who are not afraid to challenge the status quo in a respectful manner. Driven by our aspirations, we embrace the unknown as part of our adventure. Our diverse team of over 850 colleagues from more than 100 nationalities is committed to shaping the future of business spending together.About the RoleWe are on the lookout for a Backend Engineer to join the dynamic Pleo team. In this role, you will contribute to the development and scaling of our backend systems while engaging in exciting projects as we expand our product and service offerings. If you are enthusiastic about tackling complex technical challenges within a culture that prioritizes transparency, collaboration, and a strong commitment to innovation, this position is ideal for you.Your ResponsibilitiesAs a Backend Engineer, your tasks will include:Designing, building, and maintaining scalable microservices, primarily utilizing Kotlin.Working collaboratively with cross-functional teams to devise innovative solutions across various domains including Platform, Services, and SMB.Assessing system performance and implementing optimizations to guarantee high reliability and scalability.Participating in code reviews and post-mortems while mentoring junior engineers.Proactively managing technical debt and guiding the team through challenges and migrations.Your ProfileYou will excel in this role if you possess:Experience with server-side languages, particularly Kotlin, and familiarity with distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes).Proficiency with relational databases like PostgreSQL and an understanding of system optimizations.

Spend management often involves cumbersome processes that can frustrate both finance teams and employees. At Pleo, we are transforming this landscape by creating innovative solutions that simplify money management, making it efficient and empowering for everyone involved.Our name, ‘Pleo’, translates to ‘more than you’d expect’, and embodying this principle has been key to our success over the past decade.As we reach a crucial phase in our evolution, every decision we make affects our 40,000+ customers and our shared success. We seek individuals who are passionate about identifying customer needs, simplifying complex challenges, and are not afraid to respectfully challenge the status quo. Our ambitious drive makes our journey exciting, and we pride ourselves on being a collaborative team of over 850 individuals from more than 100 nationalities, all focused on redefining business spending.Join us in our mission to make spend management effective and rewarding. Our product supports thousands of companies across Europe, and our web application is a cornerstone of that experience.We are looking for a Staff Engineer to join our Web Core team—the specialists behind our frontend platform. The Web Core team enables product engineers at Pleo to deliver high-quality web software swiftly. We oversee the foundational aspects of our web stack, including tooling, architectural patterns, and the reliability of our developer workflow. Our collaboration with product teams ensures faster, safer, and more consistent delivery.Responsibilities of the Web Core TeamDevelop and maintain a web platform utilized by teams for delivering outstanding web experiences.Champion technical excellence across Pleo’s web applications in areas such as architecture, patterns, quality, performance, and accessibility.Enhance developer experience (DX) through improved tooling, CI reliability, and rapid feedback loops.Maintain shared web foundations (libraries, conventions, golden paths) and foster their adoption.Engage and contribute to the wider frontend community within Pleo.Your RoleAs a Staff Engineer in Web Core, you will act as a force multiplier. Your role will involve collaborating across teams and systems to eliminate obstacles and elevate our web software development practices.

Managing expenses shouldn’t be cumbersome. At Pleo, we're revolutionizing the spend management landscape. Our innovative solutions empower finance teams and employees alike, creating a seamless experience that drives efficiency and effectiveness. Our mission is to help businesses surpass their financial management expectations.The name 'Pleo' translates to 'more than you’d expect', and this philosophy has been at the heart of our success throughout the past decade.As we forge ahead on our exciting journey, each decision impacts over 40,000 customers and our collective success. We seek individuals who take pride in understanding customer needs, simplifying complex problems, and respectfully challenging the status quo. Driven by ambition, we embrace the unknown, as that’s where the excitement lies! Our diverse team of over 850 professionals from more than 100 nationalities is committed to shaping the future of business spending together.About the RoleWe're on the lookout for a talented Backend Engineer to join our dynamic team at Pleo. In this position, you'll be instrumental in building and scaling our backend systems while participating in exciting projects as we expand our product and service offerings. If you are eager to tackle complex technical challenges within a culture that champions transparency, collaboration, and innovation, this role is perfect for you.Your ResponsibilitiesAs a Backend Engineer, you will:Design, build, and maintain scalable microservices primarily utilizing Kotlin.Collaborate with cross-functional teams to innovate solutions across various domains including Platform, Services, and SMB.Analyze system performance and implement optimizations to guarantee high reliability and scalability.Engage in code reviews, conduct post-mortems, and mentor fellow engineers.Tackle technical debt proactively and guide the team through technical challenges and migrations.Your QualificationsTo thrive in this role, you should possess:Experience in server-side programming, particularly with Kotlin, and familiarity with distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes).Proficiency in relational databases such as PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like Grafana.

Pleo builds intuitive spend management solutions that help finance teams and employees work smarter. With over 40,000 customers and a decade of growth, Pleo’s mission is to simplify financial operations and help businesses achieve more than expected. The team includes more than 850 professionals from over 100 nationalities, all focused on shaping the future of business spending. Role Overview The Staff People Systems Engineer will play a central role in Pleo’s People Technology team. This position focuses on making sure our people systems are integrated, scalable, and ready to support Pleo’s ongoing growth. The work involves translating business needs into technical solutions and continuously improving how our systems connect and function. What You Will Do Design and build integrations, automations, and services across platforms like HiBob, Ashby, and related tools. Connect systems using APIs, webhooks, and event-driven architectures. Shape technical architecture and provide direction for decision-making and development priorities. Drive change management and ensure our systems can scale with the company. Work closely with another Staff People Tech Engineer to address complex challenges and share technical insights. Collaborate with stakeholders in People Operations, Talent Acquisition, Payroll, Rewards, and Learning & Development to clarify requirements and communicate priorities. Who We’re Looking For Experience designing and implementing technical solutions for people systems. Comfort working hands-on with integrations and automations. Ability to partner with diverse teams and manage competing requirements. Strong communication skills and a collaborative approach. Interest in owning a domain from end to end and setting clear technical direction. Location This role is based in Denmark.

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.

OverviewAt Corti, we are dedicated to making medical expertise accessible to everyone, regardless of their location.Currently, half of the global population lacks access to quality healthcare. Even in advanced healthcare systems, outcomes can vary widely, and clinicians often face overwhelming workloads. The pace at which medical knowledge expands is outstripping our ability to keep up.Corti is at the forefront of closing this gap by building a cutting-edge AI platform that enhances access to medical expertise. Our solutions aim to reduce errors, reclaim valuable time for clinicians, and make healthcare more affordable and human-centric.We believe that quality healthcare is a dialogue, and reliable AI is built on a strong foundation. Join us in shaping both.Why Join Corti?Corti is revolutionizing the intelligence layer of global healthcare. We empower developers, product teams, and healthcare innovators with access to medical-grade AI, enabling faster, safer, and more compassionate care.Our AI models are meticulously trained on real-world data, specifically optimized for precision, safety, and regulatory compliance, making them ideal for healthcare and related industries.Using our modular APIs, teams can seamlessly integrate medical speech recognition, summarization, reasoning, and other functionalities into their healthcare products without starting from scratch.We support innovators who are redefining healthcare, from startups enhancing patient experiences to established enterprises modernizing critical systems. If you share our vision that AI tailored for medicine will shape the future of healthcare, we want you at Corti.The RoleWe are seeking an MLOps Engineer to ensure our machine learning models operate reliably and deliver value in production environments. This role involves monitoring, maintaining, and integrating models into products while facilitating their deployment.Your Responsibilities:Oversee the complete lifecycle of ML models and core infrastructure, from development and deployment to monitoring and continuous enhancement.Develop and uphold robust CI/CD pipelines for both software and ML workflows.Guarantee the reliability, scalability, observability, and security of production systems and ML infrastructure.Automate deployment, orchestration, and environment management using effective tools and practices.

Role Overview Keylane is looking for a Test Engineer with a focus on IT and Pension solutions in Copenhagen. This role centers on maintaining the quality and reliability of software products used across the pension sector. What You Will Do Design and carry out test plans for software serving the pension industry Work closely with cross-functional teams to identify and document defects Support ongoing improvements to system performance and security About the Team Join a group dedicated to building and refining software for the pension industry. The team values collaboration, high standards, and a commitment to secure, reliable solutions.