Senior Software Engineer (YDB Team)

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Nebius is seeking a Senior Software Engineer for the YDB Team to work remotely with their Prague hub. You will help evolve a high performance open source product that combines scalable binary object storage with a distributed relational database and message broker, powering S3 and AI workloads. Required are 5+ years of C/C++ experience for highly loaded systems, plus 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 include on-disk data structures, storage internals, SPDK/DPDK, networking, Kubernetes, and incident response. Prepare to demonstrate low-latency optimizations; coding interviews will be held.

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!