Senior Software Engineer (YDB Team)

About Nebius: Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in-house AI/ML infrastructure. Built by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI. Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D. The YDB Development Team at Nebius is looking for Mid and Senior Software Developer with a strong expertise in C++. YDB is an open-source product that serves two main purposes within Nebius: • A scalable and reliable binary object storage foundation powering S3 Object Storage, Filestore, Network Block Storage Tailored to process AI- related Workloads • A distributed relational database and message broker supporting Nebius cloud operations such as IAM, Billing, Audit Trails and Logging How You Will Change the World with Us • Adapt YDB to leverage modern hardware to its fullest potential: QLC NVMe drives, Dual 800Gb/s network adapters, BlueField DPUs • Maximize performance on widely used devices such as HDDs and TLC NVMe • Reengineer YDB components with more efficient algorithms to solve complex system challenges Requirements • 5+ years of experience in C/C++ programming for highly loaded systems • Understanding of core dumps, flamegraphs, and sanitized builds • Experience developing high-performance, low-latency components • Understanding of CPU caches, Modern CPU atomic operations and NUMA architectures Nice to Have • Experience with on-disk data structures (LSM trees, B+ trees) • Hands-on experience with debugging and profiling tools such as perf, VTune, bpftrace, gdb • Knowledge of storage-related algorithms (erasure coding, checksumming) • Understanding of storage device internals (NVMe, HDD) • Familiarity with Linux kernel, SPDK/DPDK, libaio, io_uring • Knowledge of networking concepts and protocols (IP, TCP, UDP, DNS, ideally InfiniBand, RoCE/RDMA) • Experience with Kubernetes and Grafana • Track record of active participation in incident resolution • Experience designing production-grade distributed storage components • Knowledge of availability and durability calculations We conduct coding interviews as part of the process. Benefits & Perks: • Competitive compensation • Career growth and learning opportunities • Flexibility and ownership • Collaborative and innovative culture • Opportunity to work on impactful AI projects • International environment and talented teams What's it like to work at Nebius: Fast moving - Bold thinking - Constant growth - Meaningful impact - Trust and real ownership - Opportunity to shape the future of AI Equal Opportunity Statement: Nebius is an equal opportunity employer. We are committed to fostering an inclusive and diverse workplace and to providing equal employment opportunities in all aspects of employment. We do not discriminate on the basis of race, color, religion, sex (including pregnancy), national origin, ancestry, age, disability, genetic information, marital status, veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by applicable law. Applicants must be authorized to work in the country in which they apply and will be required to provide proof of employment eligibility as a condition of hire. If you need accommodations during the application process, please let us know.