Senior Software Engineer

Nebius B.V.; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Competitive compensation

Career growth and learning

Flexibility and ownership

Collaborative and innovative culture

Impactful AI projects

International environment

Job summary

Nebius is seeking mid and senior software developers with a strong C++ background to work on the YDB project, an open-source storage and database system. You will influence design choices, optimize performance for AI workloads, and contribute to a distributed storage and database stack powering Nebius cloud operations.

The role involves implementing high-performance components, debugging and profiling, and collaborating with international teams in a fast-moving, ownership-driven environment.

Qualifications

• 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.
• Knowledge of storage device internals (NVMe, HDD).
• Familiarity with Linux kernel, SPDK/DPDK, libaio, io_uring.
• Experience with Kubernetes and Grafana.
• Track record of incident resolution and distributed storage design.

Responsibilities

• Adapt YDB to leverage modern hardware to its fullest potential.
• Reengineer YDB components with more efficient algorithms to solve complex system challenges.
• Contribute to production-grade distributed storage components and ensure high availability.

Skills

C/C++ programming

High-performance, low-latency

Linux kernel familiarity

Networking concepts

Kubernetes

Debugging tools (perf, VTune, gdb)

NUMA architectures

Storage algorithms (erasure coding)

Tools

GDB

Perf

VTune

bpftrace

Job description

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

We conduct coding interviews as part of the process.

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

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.

5+ years of C/C++ experience, Experience with high-performance, low-latency components, Familiarity with Linux kernel and networking concepts, Experience with debugging and profiling tools (perf, VTune, gdb)