Backend Quality Assurance Engineer

Full-time | Munich | Seed Stage | Equity + SalaryJoin Us in Building a Transformative CompanyAt Knowlix, we are dedicated to amplifying the productivity of small businesses tenfold. Our goal is to establish ourselves as the premier platform for human-AI and AI-to-AI collaboration.Although we are in the early stages, we have grand ambitions. This is a unique …

As a Senior Backend / Platform Engineer at causaprima, you will take charge of the foundational platform that empowers our agents. This includes overseeing an event-driven architecture, managing data pipelines, integrating with customer accounting systems, and ensuring the infrastructure is reliable, auditable, and swift.Key ResponsibilitiesEvent Store Management — Lead the development of an append-only PostgreSQL event store featuring tamper-evident hash chaining, real-time event distribution, agent replay capabilities, and schema versioning.Cryptographic Signature Infrastructure — Implement key management and signature verification for all agent events, including establishing approval chains for external actions.Workflow Constraint Engine — Develop a robust gateway that verifies authorization before any external action (email, payment, API call) is executed.PII Vault & GDPR Compliance — Ensure the safe storage of personal data through isolated, encrypted solutions, allowing for the right to erasure and data residency per region.Multi-Tenancy Architecture — Design systems that incorporate row-level security and tenant isolation across all data stores, including tenant-scoped LLM API keys.Authorization (Cerbos) — Implement attribute-based access control for agents and humans with deterministic policy evaluations, ensuring LLMs are not responsible for authorization decisions.MCP Security Layer — Establish authentication protocols, capability-based scoping per partner, and rate limiting for the Model Context Protocol endpoint.Database Architecture — Drive PostgreSQL schema design, create effective indexing strategies, and enhance performance tuning and read replica topology.

Join vCluster Labs as a Senior Backend Software Engineer, where your coding expertise will play a pivotal role in shaping the future of Kubernetes multi-tenancy. In this influential position, you will be a key architect of the vCluster Platform, navigating intricate Kubernetes internals to develop tools utilized by top engineering teams globally.Your responsibilities will include:Diving Deep into Kubernetes: Collaborate closely with Kubernetes internals, pushing the limits of container orchestration.Expert Go Development: Craft high-performance, resilient Go code that powers the core functionalities of the vCluster platform.Taking Ownership: Exhibit complete ownership of your projects; self-motivated and capable of guiding feature development from technical design to production without constant supervision.Open Source Contribution: Collaborate with the community and contribute to open-source initiatives, shaping the next generation of tenancy models with scalable solutions for resource sharing and isolation beyond basic namespaces.Solving Technical Challenges: Address complex engineering problems that require a profound understanding of systems architecture.This position may be ideal for you if you possess:Kubernetes Expertise: Extensive knowledge of Kubernetes internals, including architectural patterns, networking, and storage.Proficiency in Go: Strong programming capabilities in Go, translating Kubernetes insights into clean, efficient code.A Builder Mentality: Passion for building outside work, demonstrated through active GitHub projects or open-source contributions.High Agency: A self-driven individual thriving in environments where you can independently identify and solve problems.Startup Experience: A background in high-growth environments, comfortable with ambiguity and eager to make an impact.Bonus qualifications include:...

WHO WE AREAt Proxima Fusion, we are on a transformative mission to revolutionize sustainable energy. Leveraging the innovative W7-X stellarator and the latest technological advancements, we are paving the way for commercially viable fusion power solutions.Our work in stellarator optimization, driven by state-of-the-art computation and machine learning, is pushing the boundaries of fusion technology. We are unlocking new high-performance design opportunities through high-temperature superconducting magnets.To seize this monumental opportunity, we are assembling a team of exceptionally dedicated and passionate individuals who will unite to drive groundbreaking advancements in technology.WHY JOIN PROXIMA FUSIONEngage in some of the most intricate technological challenges aimed at delivering abundant, safe, and clean energy to the world.Collaborate and learn alongside a remarkable group of accomplished and motivated professionals.Make your most impactful contributions and enjoy the journey of innovation.Demonstrate that great achievements are possible in Europe when the best talent comes together.YOUR IMPACTAt Proxima Fusion, our simulation-first strategy will be anchored by robust software infrastructure and tools. The challenge lies in developing software that facilitates the exploration of the expansive hyper-dimensional space of stellarator designs to maximize feasibility while minimizing costs.The Dev Platform team is constructing the backbone of our highly integrated, simulation-driven approach to stellarator design. Our foundational data, computing, and analysis infrastructure supports research and development across the organization. In this role, you will work closely with fusion experts, engineers, and AI researchers to create infrastructure and influence our software development processes. If you possess strong software skills, a commitment to product quality, and a proactive attitude, this is a unique chance to contribute to a future powered by fusion.WHAT YOU WILL DODesign and develop a platform that empowers simulation, optimization, and stellarator design teams to tackle their challenges and achieve their objectives more efficiently.Lead the Cloud Infrastructure Operations.Oversee general cloud infrastructure management.

Atolls is the world's largest community-driven shopping platform, operating in over 20 markets.We empower millions to make informed spending decisions through discovery, evaluation, and (re-)purchase by connecting them with the right brands and retailers.With a team of over 1,000 professionals spanning 10 countries, we create products that are utilized daily on a global scale. Here, you'll enjoy genuine ownership of your work and witness the tangible impact of your contributions. Want to influence the shopping experiences that people trust? Read on.About This Role:We are seeking a Senior Backend Engineer (TypeScript, NestJS/Node.js) to join our Fulfilment team in Munich or to work remotely within Germany. Your role will be crucial in enabling our customers to earn and redeem cashback on our rewards platforms, thereby creating outstanding user experiences and empowering consumers to make informed shopping decisions. As an integral part of our team, you will directly contribute to building and enhancing the digital platforms our users depend on throughout their shopping journeys.Your contributions will influence how millions of consumers engage with our platforms, guiding them to make intelligent, equitable, and rewarding choices.Our Benefits:At Atolls, we are committed to fostering both your professional and personal development. Here’s what we offer: • A culture that promotes personal and professional growth, with opportunities for internal mobility. • A supportive and open-minded team that values diverse perspectives and innovative ideas. • 32 days of paid vacation plus your birthday off, ensuring you have ample time to recharge. • A flexible hybrid working model to help you balance work and life. • Access to a learning budget and internal training to facilitate your growth in your role. • Mental health coaching to support your well-being.

About Apaleo Apaleo builds an open, API-first property management platform for the hospitality industry. The company’s modular infrastructure helps hotels customize their technology, automate routine work, and deliver tailored guest experiences. Apaleo’s platform includes advanced applications and AI agents that adapt to each guest’s needs. Role Overview The Senior Backend Engineer (.NET) will shape the foundation of Apaleo’s public API layer. This position focuses on creating the Storefront API, a scalable interface that lets external systems, such as ChatGPT and booking platforms, connect directly with Apaleo. The work combines backend engineering with AI, starting from a clean API design and moving toward systems that support intelligent, agent-driven guest interactions. What You Will Do Design and implement the Storefront API for Apaleo’s property management platform Develop scalable, reliable backend solutions in .NET Enable integrations with external partners and booking platforms Build systems that support agentic booking and AI-powered guest experiences Work with a high degree of autonomy on architecture and deployment decisions Location This role is based in Munich.

Atolls: The World’s Largest Community-Driven Shopping PlatformWe empower millions to make informed spending decisions, connecting them with the best brands and retailers across 20+ markets.Join our diverse team of over 1,000 professionals in 10 countries and contribute to products that impact global shoppers daily. Ready to make a difference? Read on!About This Role:We are seeking a Senior Java Backend Engineer to enhance our dynamic engineering team in Munich. In this pivotal role, you will be instrumental in designing, developing, and scaling high-performance backend systems utilizing cutting-edge Java technologies and cloud-native architectures. Ideal candidates are those who thrive in tackling complex systems, prioritize code quality, and possess a robust architectural perspective.Our Benefits:At Atolls, we prioritize your professional and personal growth. Here's what you can look forward to:A culture that champions personal and professional development, along with ample internal mobility opportunities.A welcoming and innovative team that values diverse perspectives.32 days of paid vacation plus an additional day off for your birthday.Flexible hybrid work arrangements to help balance your professional and personal life.Access to a learning budget and internal training resources to foster your development.Support through mental health coaching to promote well-being.Regular global and local events to celebrate achievements and foster connections.The opportunity to take a sabbatical after three years of service.A cloud-based setup that allows for collaboration from anywhere.*These benefits are applicable globally, with additional local perks based on your location.Responsibilities:As a Senior Java Backend Engineer, your key responsibilities will include designing and implementing robust backend solutions, ensuring system scalability, and maintaining high standards of code quality.

airapps is looking for a DevOps Engineer focused on backend development to help build and maintain scalable cloud-based systems. This position is based in Munich and works closely with teams across the company. Role overview This role centers on designing, implementing, and supporting backend infrastructure for airapps’ cloud applications. Collaboration with cross-functional teams is a key part of the job, ensuring that backend solutions meet business needs and technical standards. What you will do Work with teams to design and maintain backend systems for cloud-based products Use expertise in cloud services, automation, and infrastructure management to improve deployment processes Support and enhance CI/CD pipelines to increase system reliability Contribute ideas and technical solutions that help drive operational efficiency Requirements Experience with cloud services and backend infrastructure Knowledge of automation and deployment processes Ability to collaborate with cross-functional teams Strong problem-solving skills and an innovative approach

ABOUT USAt Avelios Medical, we are committed to developing a premier software platform dedicated to the data-driven digital transformation of hospitals and patient care. Our innovative modular software platform is designed to digitize and enhance workflows in healthcare settings using the latest technology, all while ensuring user-friendliness. Our mission is to empower hospitals, doctors, and nurses to deliver the highest quality patient care. As we rapidly expand, we invite diverse talent to join our team and contribute to the advancement of healthcare.THE TEAM AND ROLEIn your role as a (Senior) Backend Engineer (All Genders), you will be instrumental in building a robust and secure infrastructure that supports our platform within clinical environments. You will collaborate with our core development team to design scalable services, optimize performance, and implement industry best practices in backend engineering, all aimed at making a significant impact in healthcare.YOUR RESPONSIBILITIESWork closely with our core development team to create secure and reliable backend services.Design, test, deploy, and maintain crucial Avelios services and infrastructure.Develop scalable and high-performance software tailored for the healthcare context.Promote and implement best practices in fast and secure software engineering.Utilize modern technologies to address complex challenges in clinical digitization.Contribute innovative ideas to enhance system architecture, usability, and performance.YOUR QUALIFICATIONSDegree in Computer Science, Informatics, Business Informatics, or related practical experience.Proficiency in at least one of the following programming languages: Java, C++, or Rust.Demonstrated coding experience, with GitHub contributions or personal projects being advantageous.A strong desire to learn and work with new technologies and tools.Excellent problem-solving skills and a proactive, solution-oriented approach.Fluency in English is required.YOUR BENEFITSDiverse and engaging tasks with opportunities for ownership.An international and informal team structure that fosters motivation and collaboration.

Role overview apaleo is looking for a Staff Backend Engineer with expertise in .NET to join the team in Munich. The main focus is on designing, building, and maintaining backend services that power apaleo’s hospitality products. What you will do Design and implement backend systems using .NET technologies Maintain and enhance existing services for better reliability and performance Collaborate with engineering, product, and design teams to develop scalable solutions Contribute to delivering a strong user experience through robust backend systems Location This role is based in Munich.

JetBrains has developed tools for software teams since 2000. By automating routine checks and corrections, JetBrains products help developers focus on building and shipping software. The goal: make development more productive and creative. Role overview This Backend Customer Success Engineer role centers on supporting engineering teams as they adopt Kotlin for backend development. The position focuses on helping organizations successfully bring Kotlin into production environments. What you will do Guide organizations through the process of moving from Java to Kotlin, assisting with migration, integration, and scaling. Troubleshoot technical challenges that arise during the transition and support teams as they progress from initial experimentation to stable production use. Work with potential users to clarify how Kotlin adoption works and help design migration plans that fit their specific needs. Locations Amsterdam, Netherlands Berlin, Germany Munich, Germany Prague, Czech Republic Remote, Germany

Join our dynamic INSPO team as a Senior Backend/Infrastructure Developer, where your expertise will shape innovative solutions that enhance our infrastructure. In this fully remote role, you will collaborate with a passionate group of professionals dedicated to excellence. Your responsibilities will include designing, implementing, and maintaining scalable backend systems, ensuring optimal performance and security.

ABOUT USAt Avelios, our vision is to revolutionize healthcare through our advanced software platform, designed for the data-driven digitization of hospitals and patient care. Our modular platform enhances hospital workflows using innovative technology, ensuring that healthcare professionals can provide exceptional patient care. As we expand rapidly, we recognize that diverse backgrounds strengthen our team and mission.THE TEAM AND ROLEAs a Working Student in Backend Engineering (All Genders), you will join a dynamic development team and gain practical experience in creating large-scale, mission-critical software. Collaborating with seasoned engineers, you will contribute to the foundational digital infrastructure that empowers real-world clinical care, while learning to produce secure, scalable, and high-quality code that makes a tangible difference.YOUR RESPONSIBILITIESCollaborate with our core development team on impactful product features.Design, test, deploy, and maintain backend or frontend components of Avelios services.Acquire knowledge on building and maintaining large-scale clinical software infrastructure.Utilize modern technologies in a high-stakes healthcare environment.Learn and implement best practices in secure and efficient software engineering.Contribute innovative ideas to enhance performance, usability, and user experience.YOUR QUALIFICATIONSCurrently enrolled in Informatics, Computer Science, Business Informatics, or a related field.Proficiency in at least one of the following programming languages: Java, C++, or Rust.Demonstrated coding experience through projects or GitHub contributions is advantageous.A genuine enthusiasm for learning and exploring new technologies.A solution-oriented mindset with a strong emphasis on execution.Fluency in German and/or English.YOUR BENEFITSGain valuable hands-on experience in a cutting-edge healthcare technology environment.Work alongside experienced professionals and learn best practices in the industry.Flexible working hours to accommodate your studies.

Join Renesas Electronics as a Graduate Engineer specializing in Digital Backend processes, particularly focusing on RTL-to-GDS transitions. In this role, you will collaborate with experienced engineers to enhance and optimize our digital design workflows using Cadence tools.This position offers an opportunity to work in a dynamic environment where innovation is encouraged, and you will be able to contribute to exciting projects that shape the future of electronics.

At Qwello, we're on a mission to transform the charging industry and lead the transition from combustion to electric. We specialize in designing, building, and operating charging infrastructure for public spaces. Our focus is on simplicity, user-centric design, and engineering excellence.We celebrate diverse perspectives and backgrounds, fostering a culture where everyone feels they belong. We believe that the finest products emerge from collaborative teams rather than individual brilliance. Join us in shaping the future of E-mobility!We're seeking a Junior Backend Developer to be part of our dynamic Backend Team. In this role, you will contribute to the design and implementation of new backend services, primarily using Python or Rust, to support our expanding fleet of self-designed charging stations across Europe. You will also engage with backend-to-backend systems that integrate Qwello's services with those of our partners. Your commitment to reliability and craftsmanship will guide you in creating systems that are testable, resilient, and observable. If you value security and efficiency, and possess a communicative and inquisitive mindset, you will thrive in our startup environment. Collaborate with a multidisciplinary team and leverage your skills, experience, and enthusiasm to build a flourishing business. As a proactive team member, your motivation to learn and grow will be key to our collective success.Let's power the future together!

Intrinsic Robotics, a pioneering venture within Alphabet, is dedicated to revolutionizing the landscape of industrial robotics. Our team is driven by the belief that breakthroughs in artificial intelligence, perception, and simulation will reshape the capabilities of industrial robotics in the near future, with software and data at the heart of this transformation. Our mission is to make intelligent industrial robotics accessible and usable for a multitude of businesses, entrepreneurs, and developers. We are a vibrant group of engineers, roboticists, designers, and technologists, all committed to unleashing the creative and economic potential of industrial robotics.Role OverviewIn your capacity as a Senior Research Engineer specializing in Data Engine, you will spearhead the design and implementation of systems that facilitate the training, deployment, and utilization of large-scale AI models for robotics. Your leadership will shape the technical direction, mentor fellow engineers, and ensure the establishment of robust, scalable data pipelines and machine learning infrastructure essential for enhancing the capabilities of robots in real-world settings. Your contributions will empower both internal teams and external partners by delivering accessible tools and infrastructure for integrating advanced AI methodologies into robotic applications.Key ResponsibilitiesLead the architecture and execution of infrastructure for training and deploying large-scale robotic foundation models.Manage the development and upkeep of data pipelines for the collection, processing, and integration of real-world robot data into machine learning workflows.Enable machine learning researchers and engineers with user-friendly tools and infrastructure for leveraging AI techniques in robotics.Collaborate with product and engineering teams to specify infrastructure needs and deliver effective solutions for both partners and customers.

At The Exploration Company, we are at the forefront of developing, producing, and operating Nyx, a groundbreaking modular and reusable space orbital vehicle. This innovative vehicle is designed to be refuelable in orbit and capable of transporting both cargo and, in the future, humans.We are seeking a skilled and passionate AIT Propulsion Engineer to join our mission. You will play a pivotal role in the integration and testing of propulsion-related products and equipment. This includes the Nyx Capsule propulsion system, in-house developed large engines, smaller thrusters, pumps, igniters, and more.To excel in this position, you will be responsible for:Overseeing the preparation and execution of integration and functional tests for the Propulsion Qualification Model (PQM) and the Flight Model (FM).Acquiring necessary tools and organizing test setups, including the preparation of procedures and schedules.Supporting the design of Ground Support Equipment (GSE).Collaborating closely with the design team to optimize designs for seamless integration and testing (Design for Manufacture).Leading a small team in assembly and integration operations.Conducting functional tests of components, including internal thermal vacuum, outgassing, pressure tests, proof tests, and Cv characterization.Integrating thrusters or propulsion engines and all necessary instrumentation on the capsule.Providing support for AIT operations, executions, and tests.Documenting procedures and generating concise reports following tests.Identifying lessons learned and driving continuous improvement initiatives.We would love to see the following qualifications:As an AIT Propulsion Engineer, you should possess:A completed Engineering degree (Master's or PhD) in mechanical science, propulsion, or a related field.A dual skill set in:Mechanical assembly for integration and possibly design of small tools/GSE.Electrical skills for testing (data acquisition systems for sensors, basic programming in Python, harnessing, etc.).An eagerness to contribute to building and supporting a new team.Strong organizational skills and a meticulous approach to work.

Hypersonica, based in Munich, develops defense technology to advance Europe's hypersonic capabilities. The team moves quickly from concept to solution, focusing on speed, resilience, and technological independence. As a small group of specialists, Hypersonica tackles complex technical challenges that shape the future of the industry. Role overview The Senior Ground Software Engineer position is central to Hypersonica’s mission. In this role, engineers help define current projects and influence the company’s technical direction. The team values broad technical knowledge, independent work, and sound judgment. Each person’s contributions directly affect both project outcomes and Europe’s technological autonomy. What makes this role unique Responsibilities are flexible and may shift as business needs or personal strengths evolve. Work has a direct, visible impact on both projects and the broader mission. Collaboration takes place within a close-knit, highly skilled team where every member plays a crucial part. What we look for Engineers who have solved difficult problems or worked across traditional boundaries. People with deep technical expertise, practical judgment, and the ability to work independently. Individuals motivated to define and deliver the next generation of European defense technology. Hypersonica encourages applications from those who recognize themselves in this description.

hawk seeks a Senior Generative AI Engineer based in Munich. This role centers on bringing new AI technologies into the company’s product line, with a focus on practical solutions for real-world challenges. Key responsibilities Collaborate with teams across hawk to design and implement generative AI features Use current AI tools and methods to enhance existing products and develop new offerings Provide technical expertise to projects aimed at solving concrete problems Role overview This position offers the chance to apply advanced AI techniques directly to product development. The work involves both improving what exists and shaping what comes next in hawk’s lineup.