Senior Backend Engineer (.NET) (f/m/d)

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.

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.

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 chance for you to influence a product that will reach millions and set industry standards.We prioritize speed, frequent iterations, and exceptional quality. If you are passionate about building, deploying, and scaling innovative solutions, particularly leveraging AI for significant improvements, this is the opportunity for you.Why Choose Knowlix Now?We are a well-funded seed-stage startup, supported by top-tier investors and seasoned founders.Our technology is functional and our initial users are experiencing its transformative effects.We are targeting a vast market with a product that revolutionizes work dynamics.As one of our early team members, you will have significant influence and ownership over the company’s direction.We believe that rapid progress is achieved through focused efforts and continuous iteration.This isn't just a job; it's a chance to contribute to a once-in-a-generation company if we execute our vision effectively.The RoleWe are seeking a pragmatic and enthusiastic Backend Engineer with robust skills in Python and a strong understanding of SQL and cloud infrastructure. You will collaborate closely with AI researchers, product designers, and DevOps engineers to create a seamless interface between human users and our AI systems. Familiarity with Go, Rust, and Swift is advantageous, especially for future components such as microservices or mobile interfaces.

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:...

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.

Join us at The Exploration Company, where we are pioneering the development, production, and operation of Nyx, a groundbreaking modular and reusable space orbital vehicle. Designed for future refueling in orbit, Nyx is set to transport cargo and, in the long term, potentially carry humans.We are seeking a skilled and experienced Senior Engineer for Functional Platforms Assembly, Integration, and Verification (AIV) to contribute to our mission. Your focus will be to finalize system-level verifications for our functional platforms, including Software in the Loop, Processor in the Loop, Hardware in the Loop, and Functional Simulation Facility, by defining, preparing, and leading associated test campaigns.

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.

As a Senior Platform Architect at ServiceNow, you will play a pivotal role in shaping the architecture of our next-generation cloud platform. Your expertise will drive innovation and ensure the scalability and reliability of our services. You will collaborate with cross-functional teams to define and implement architectural strategies that meet both current and future business needs.

Role Overview Blacklane is looking for an Engineering Manager - Platform to join the team in Berlin or Munich. This leadership role focuses on building a cohesive internal platform, transforming a set of tools and processes into a product that empowers developer success. The manager will guide a team of engineers through a period of growth, smoothing the path for product teams to deliver efficiently and with minimal obstacles. What You Will Do Lead and coach a team of engineers, fostering a collaborative and high-performing culture. Shape the platform’s direction in partnership with the Staff Engineer, rather than following a fixed roadmap. Manage delivery timelines and scope, making decisions that balance quality and progress. Translate ambiguous requirements into clear, actionable deliverables. Drive improvements across developer experience, infrastructure, and Site Reliability Engineering (SRE). Maintain open communication with other Engineering Managers to manage expectations and dependencies. Support team growth, performance, and structure through continuous learning and coaching. What We Look For Experience leading high-performing teams in Platform, Backend, or Data Engineering. Comfort with ambiguity and a talent for making trade-off decisions that keep projects moving forward. Initiative to address issues, build business cases, and secure buy-in for solutions. Commitment to seeing projects through to completion and ensuring objectives are met. Motivation to learn continuously and tackle complex challenges. Location This position is based in Berlin or Munich.

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.

airapps seeks a Backend Quality Assurance Engineer based in Munich. This position centers on upholding and enhancing the quality of backend systems, collaborating closely with development teams to help deliver dependable software releases. Key responsibilities Develop and execute thorough test plans for backend services Partner with developers to identify and document software defects Contribute to continuous improvement of software quality Role overview This role requires careful attention to detail and a commitment to supporting reliable backend operations. The Backend Quality Assurance Engineer will play an active part in ensuring that backend releases meet airapps' standards for quality and stability.

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

Speechify’s mission is to remove reading barriers in education. More than 50 million people use our text-to-speech tools to turn PDFs, books, Google Docs, news stories, and websites into audio. Our products span iOS, Android, Mac, Chrome, and web. Recent recognition includes Google’s Chrome Extension of the Year and Apple’s Design Award for Inclusivity in 2025. Our team includes nearly 200 people working fully remotely. We bring together frontend and backend engineers, AI researchers, and professionals from Amazon, Microsoft, Google, Stripe, Vercel, Bolt, and other top companies. Role Overview The Platform team builds and maintains the backend services behind Speechify’s products. These services cover payments, analytics, subscriptions, new product features, text-to-speech processing, and external APIs. This position suits engineers who think strategically, enjoy shaping products, and care about user experience. Speechify has a flat structure. Team members are encouraged to take initiative, demonstrate technical skill, and lead by delivering results. Success here requires strong communication, a solid work ethic, and persistence. What You Will Do Design, develop, and manage APIs, including public text-to-speech endpoints and internal services for payments, subscriptions, authentication, and consumption tracking, with a focus on scalability and business needs. Maintain and optimize the backend API ecosystem to ensure high performance and reliability. Collaborate on B2B solutions, customizing and integrating backend systems for enterprise customers. Work with cross-functional teams to align backend architecture with product goals and deliver a strong user experience. Interview Process The process includes several technical interviews, typically completed within one week. Location This role is based in Munich, Germany. The team operates remotely, with no physical office.

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.

At JetBrains, we are passionate about code. Since our inception in 2000, we have dedicated ourselves to developing the strongest and most effective developer tools available. Our innovative solutions automate routine checks and corrections, accelerating production and empowering developers to innovate, explore, and create.About the InitiativeJetBrains is transforming from standalone developer tools to a unified, AI-native platform for software development.AI is evolving from a mere assistant within the editor to an essential participant in software planning, building, reviewing, and operating across teams and organizations. This evolution presents new challenges that cannot be addressed by individual tools alone, including governance, security, cost management, observability, and cooperation between humans and autonomous agents.Our mission is to establish a platform that facilitates the adoption of AI in software development in a structured, scalable, and economically efficient manner, without confining companies to closed ecosystems.We are constructing a foundation that unifies developer workflows, team collaboration, and organizational oversight into a coherent system.This platform will act as the execution and governance layer for AI-driven development, tightly integrated with developer tools while designed for cross-team, product, and environmental compatibility.This initiative represents a long-term strategic investment for JetBrains and is a cornerstone of our vision for the future of software development. The RoleWe are seeking a Principal Engineer (JetBrains Cloud Platform, Developer Experience) to spearhead significant enhancements to the development experience across the JetBrains Cloud Platform (JCP).This position is pivotal in enhancing the productivity of JCP engineers through improvements to build systems, CI/CD pipelines, local development workflows, tooling infrastructure, and AI pipelines. You will oversee the developer experience from the local development, build, and testing stages to the transition of code through CI to production. Given the rapid growth of this platform, numerous workflows and processes are still in development. You will define what an exceptional development experience entails and guide the organization toward achieving it. As part of our team, you will:Develop and implement strategies for enhancing the developer experience across the entire JCP platform.Optimize build systems (such as Gradle and Nx) for improved speed, caching, and reliable reproducibility at scale.Establish AI development pipelines to facilitate innovation.

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.