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Senior Software Engineer (Systems Engineering) at LocalStack. We are a fast-growing Series A startup building cutting-edge technology to revolutionize cloud development processes and support highly efficient dev&test feedback loops. We’ve closed our last $25mil round in Q4 2024, led by Notable Capital, CRV and Heavybit.. At its core, LocalStack provides a high-fidelity emulator and local cloud development platform. Imagine developing cloud applications and data pipelines entirely on your local machine within a lightweight cloud sandbox, running in Docker!. Our . mission.  is to empower developers to rapidly build and test their cloud applications, allowing for a more enjoyable dev experience, and saving valuable time and resources.. LocalStack has a large and active open-source community (57k+ stars on GitHub) with over 100k active users worldwide and 290M+ downloads to date. Our customer base ranges from SMBs to Global Fortune 500 companies.. We are sustainably growing our globally distributed team across sectors. LocalStack is headquartered in Zurich/Switzerland 🇨🇭, with a main engineering office in Vienna/Austria 🇦🇹 and remote team members from 🇺🇸the US, 🇫🇷FR, 🇬🇧UK, 🇨🇦CA, 🇪🇸ES, and many more countries.. This is the right opportunity for a person with over 5+ years in systems or backend engineering roles, experience in building low-level runtime systems for containerized environments, a strong background in API design and build, as well as a strong background in cloud-native technologies like Docker and Kubernetes.. ✅ What you will be working on/responsible for. 5+ years of experience in systems engineering, backend development, or a similar low-level technical role. . . Proven experience developing and maintaining container-based runtime systems (e.g., Docker), with a strong focus on performance, reliability, and cross-environment portability. . . Solid understanding of container orchestration platforms such as Kubernetes, and experience building tooling or infrastructure to support complex deployments. . . Strong software engineering skills with proficiency in Python (or similar languages), and experience designing well-structured APIs and system architectures. . . Familiarity with benchmarking, profiling, and optimizing distributed systems at the emulator or runtime level. . . Hands-on experience contributing to or maintaining Open Source projects, with a collaborative and community-first mindset. . . Comfortable taking ownership of core infrastructure components and driving projects from idea to delivery. . . Strong communication and collaboration skills, with the ability to work closely with product teams and customers to resolve technical challenges. . . Experience mentoring engineers, giving feedback, and helping build a high-performing engineering culture. . . A proactive attitude and eagerness to work in a fast-paced startup environment, continuously improving developer experience and cloud emulation capabilities.. . ✅ Experience we expect you to bring to the role. . 5+ years of professional experience in software development, with a strong foundation in designing, building, and maintaining complex systems. . . Proficiency in systems-level languages such as Rust, C, or C++, and/or high-level languages like Python. . . Deep understanding of Linux system APIs and internals, including networking, namespaces, and tracing mechanisms. . . Hands-on experience with advanced debugging and observability tools such as perf, eBPF, strace, and similar. . . Proven ability to debug and trace application behavior in complex containerized setups (e.g., Docker, Kubernetes), addressing issues like crashes, networking, resource constraints, and permission errors. . . Familiarity with both application-level and platform-level cloud development, as well as Infrastructure-as-Code tools like AWS CDK, Terraform, or Pulumi. . . Experience in coaching and mentoring engineers, fostering a culture of learning and technical excellence. . . Exposure to working across Engineering, Developer Relations, and Go-to-Market teams to align on product goals and delivery. (Nice to have) . . Experience interfacing directly with customers to gather requirements, troubleshoot issues, and deliver technical solutions. . . Background in team or technical leadership, including ownership of critical projects and architectural decision-making. (Nice to have) . . Company Location: Spain.