Platform & Build Infra Engineer — CI/CD & Observability

Fractile; Greater London; On-site; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Competitive salary

Equity & Ownership

Private Medical, Dental and Vision

Contributory Pension

25 Days holiday + bank holidays

Life/Critical Illness Insurance

Job summary

Fractile is seeking an Infrastructure Platform Engineer to join our London-based software org. You will own end‑to‑end CI infrastructure, scale a multi‑language Bazel monorepo, and build reliable tooling across Python, C++, Rust, and ML workloads.

You’ll work with observability, incident response, and infrastructure automation to enable fast, reliable engineering across the company. The role emphasizes SRE‑driven reliability, on‑call readiness, and building developer tooling used by many

Qualifications

• 5+ years in software, platform, or infrastructure engineering
• 5+ years hands‑on experience with CI/CD for large‑scale products, including monitoring, debugging performance and resolving pipeline failures at scale
• 3+ years working with build systems (Bazel, Buck, Pants, Please, etc.)
• Experience with infrastructure as code: Terraform, OpenTofu, or Pulumi
• Experience with monitoring and observability tooling (Prometheus, Grafana)
• Knowledge of DevOps / SRE principles: SLOs, alerting design, incident management, on‑call practice
• Strong proficiency in at least one systems or scripting language (Python preferred; Go or Rust) with shipping of tooling

Responsibilities

• Own the CI infrastructure end‑to‑end: create, maintain and debug reproducible multi‑language CI pipelines, and optimize CI performance across large compute clusters.
• Build and maintain infrastructure observability, alerting, runbooks, and incident response workflows.
• IaC TODO
• Scale and maintain Fractile's Bazel monorepo as we continue growing across Python, C++, Rust, SystemVerilog, and ML workloads.
• Shape the infrastructure and platform experience for every engineer at Fractile.

Skills

CI/CD pipelines

Build systems

Infrastructure as Code

Observability

SRE

Python

Go/Rust

Bazel

Buck

Pants

Please

Terraform

OpenTofu

Pulumi

Prometheus

Grafana

Tools

Bazel

Buck

Pants

Please

Terraform

OpenTofu

Pulumi

Prometheus

Grafana

Job description

Fractile is seeking an Infrastructure Platform Engineer to join our London-based software org. You will own end‑to‑end CI infrastructure, scale a multi‑language Bazel monorepo, and build reliable tooling across Python, C++, Rust, and ML workloads.

You’ll work with observability, incident response, and infrastructure automation to enable fast, reliable engineering across the company. The role emphasizes SRE‑driven reliability, on‑call readiness, and building developer tooling used by many