Senior Systems Software Engineer
Terraquantum · 🌍 Munich
Sponsorship verdict
Posting rules out sponsorship
The posting rules out sponsorship or requires citizenship/clearance.
- No government sponsor record hereThis employer posted directly and does not match a government sponsor register.
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- Can’t check pay against the visa rulesNo salary stated. Germany EU Blue Card needs at least €50,700 a year (shortage-occupation / recent-graduate: €45,934). Source: https://www.make-it-in-germany.com/en/visa-residence/types/eu-blue-card, rules effective 2026-01-01.
- Security clearance mentionedFrom the posting’s own wording.
- Confirmed live todayWhen a source last listed this job as open.
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Sponsor Radar — Terraquantum
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About the role
The Role The Senior Systems Software Engineer will be a member of the core team building the Quantum Key Distribution system. The focus is on high-performance Python services on Linux, algorithm optimization and acceleration (also via hardware offload), and the role spans defining software architecture, integrating with FPGA/embedded subsystems, and turning requirements into reliable, observable software. The Senior Systems Software Engineer leads and co-owns the overall internal QKD software architecture and client-facing software API. By setting engineering standards, mentoring, and unblocking delivery, they ensure predictable releases and a strong execution cadence. The Responsibilities The Senior Systems Software Engineer should expect to work in the following activities. • System architecture • Leading and co-owning the QKD software architecture: control plane services, key sifting/postprocessing integration, configuration management, monitoring, and external interfaces • Defining module boundaries and service APIs; evolving the system toward clear data/control-plane separation • Efficient implementation and hardware/software integration • Designing and implementing high-performance Python services on Linux (asyncio, WebSockets, NumPy); profiling and tuning for latency and throughput • Developing, profiling, and optimizing QKD sifting and postprocessing algorithms (signal handling/processing, error correction/information reconciliation, LDPC, privacy amplification) to maximize key rate and minimize end-to-end latency; applying algorithmic improvements and implementation techniques (vectorization, concurrency/async, memory/layout tuning, C/C++ extensions, SIMD/CUDA/GPU/FPGA offload where appropriate) • Defining and maintaining robust interfaces with embedded/FPGA system components over UART/USB/PCIe/Ethernet; respecting realtime constraints and failure modes • Guiding downstream system integration (WebSockets/gRPC/REST) and ensuring clear contracts and backward compatibility • Designing for test – building mocks/simulators and automated test systems • DevOps • Building and maintaining CI/CD with Docker and GitHub Actions; automated tests, static analysis, artifact management, and release pipelines • Establishing observability (structured logging, metrics, tracing) and operational runbooks; improving reliability and debuggability with SLOs/alerts • Embedding security and crypto hygiene by default: secure transport, secrets management, key handling, and coordination with cryptography stakeholders • Adding performance benchmarking and regression tracking for key rate and end-to-end latency; integrating profiling/flame graphs into CI and enforcing performance budgets The Requirements The Senior Systems Software Engineer is expected to have the following qualifications and experience. • 5+ years of Python development; 3+ years leading or co ‑ owning service/system architecture for a hardware ‑ first product • Strong Linux async Python (asyncio, WebSockets), concurrency (threads/processes), profiling/tuning • Proven custom hardware integration (MCU, FPGA) over UART/USB/PCIe/Ethernet • CI/CD with Docker and GitHub Actions; automated testing, static analysis, artifact management • Experience with GPU & CUDA acceleration/optimization; SIMD familiarity • Production observability (logging/metrics/tracing) and incident/debug practices • Working knowledge of relational/key-value/time-series stores (PostgreSQL/Redis/Prometheus) • Security by Default mindset: secrets, secure transport, key/crypto hygiene • Proficiency in written and spoken English • Ability to be on-site in Munich office several times per week • Applicants must have the right to work in Germany at the time of application. We do not provide visa