Staff Software Engineer, Build Systems (AI)

TL;DR

Staff Software Engineer, Build Systems (AI): Designing and building scalable, hermetic build infrastructure for a large monorepo with an accent on remote build execution, content-addressable storage, and dependency management. Focus on ensuring build times shrink as the codebase grows, and supporting thousands of engineers in an AI-focused environment.

Location: Hybrid (London, UK). Expected to be in one of our offices at least 25% of the time. Visa sponsorship available.

Salary: £325,000–£390,000 GBP

Company

hirify.global is a public benefit corporation focused on creating reliable, interpretable, and steerable AI systems.

What you will do

• Design and build scalable, hermetic build infrastructure, including remote build execution (RBE) and content-addressable storage (CAS).
• Own and evolve Nix-based build environments and package management.
• Drive fine-grained dependency management across the monorepo to enable incremental builds.
• Build and maintain language-specific build toolchains and accelerator SDK/runtime builds.
• Reduce container image build times through architectural improvements to build pipelines.
• Partner with CI, Languages, and Developer Acceleration teams for seamless integration.

Requirements

• 6+ years of relevant industry experience building and operating large-scale build systems and infrastructure.
• Deep experience with hermetic, reproducible build systems (Bazel, Buck, Nix, or similar) in a large monorepo environment.
• Strong understanding of build caching strategies, remote execution, and content-addressable storage.
• Experience with containerized build environments and image build pipelines.
• Strong proficiency in at least one of Python, Rust, or Go.
• Excellent communication skills and enjoyment in supporting internal partners.
• Bachelor's degree in a related field or equivalent experience.

Nice to have

• Experience with Nix/NixOS and managing large Nix package sets at scale.
• Experience with Rust build toolchains (cargo, maturin) and Python-Rust interop.
• Experience building or operating remote build execution systems (Bazel Remote Execution API, BuildBarn, BuildBuddy, or similar).
• Experience managing accelerator SDK builds (CUDA, Neuron SDK, JAX/XLA).
• Experience with fine-grained dependency graph analysis and incremental build optimization.

Culture & Benefits

• Work as a single cohesive team on large-scale AI research efforts with a focus on impact.
• Highly collaborative environment with frequent research discussions.
• Competitive compensation and benefits.
• Optional equity donation matching, generous vacation and parental leave.
• Flexible working hours and a lovely office space for collaboration.