Senior Software Engineer (YDB Team)

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Nebius is seeking a Senior Software Engineer for the YDB Development Team to build a scalable, high-performance C++ system that powers a distributed relational database and a binary object storage foundation for AI workloads. You will adapt YDB to modern hardware such as QLC NVMe drives, dual 800Gb/s network adapters and BlueField DPUs, and push performance on HDDs and TLC NVMe. The role requires 5+ years in C/C++ for highly loaded systems, hands-on debugging and profiling with perf, VTune, bpftrace and gdb, and a deep understanding of CPU caches, NUMA and atomic operations. Nice to have: on-disk data structures, storage algorithms, SPDK/DPDK, libaio, io_uring, networking and incident response experience, Kubernetes and Grafana. We offer competitive salary, growth opportunities, flexible remote work, and a collaborative, innovation-driven environment; coding interviews are part of the process. To apply, tailor your resume to these priorities and share concrete, metrics-driven results.

Why work at Nebius
Nebius is leading a new era in cloud computing to serve the global AI economy. We create the tools and resources our customers need to solve real-world challenges and transform industries, without massive infrastructure costs or the need to build large in-house AI/ML teams. Our employees work at the cutting edge of AI cloud infrastructure alongside some of the most experienced and innovative leaders and engineers in the field.

Where we work
Headquartered in Amsterdam and listed on Nasdaq, Nebius has a global footprint with R&D hubs across Europe, North America, and Israel. The team of over 800 employees includes more than 400 highly skilled engineers with deep expertise across hardware and software engineering, as well as an in-house AI R&D team.

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

  • 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

• Hands-on experience with debugging and profiling tools:

  • perf, VTune, bpftrace, gdb

  • Understanding of core dumps, flamegraphs, and sanitized builds

• Experience developing high-performance, low-latency components

  • Understanding of CPU caches

  • Modern CPU atomic operations

  • NUMA architectures

Nice to Have

• Experience with on-disk data structures (LSM trees, B+ trees)

• 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.

What we offer 

• Competitive salary and comprehensive benefits package.
• Opportunities for professional growth within Nebius.
• Flexible working arrangements.
• A dynamic and collaborative work environment that values initiative and innovation.

We’re growing and expanding our products every day. If you’re up to the challenge and are excited about AI and ML as much as we are, join us!