Lead Site Reliability Engineer in Slough

Own Reliability. Shape the Platform. Empower Millions.

At Holland & Barrett, we\’re transforming into a truly product- and platform-led technology organisation — and we\’re looking for a Lead Site Reliability Engineer who\’s excited by scale, complexity, and impact.

Our mission? Build and evolve the resilient, high-performance systems that power health and wellness for millions of customers. If you\’re obsessed with reliability, driven by automation, and thrive in high-ownership engineering cultures, this is your opportunity to lead from the front.

What You\’ll Lead & Deliver

Reliability & Performance at Scale

• Architect and improve cloud-native systems with reliability as a first-class principle.
• Shape SLIs/SLOs, error budgets, capacity planning, and performance strategies.
• Continuously evolve availability, efficiency, and resilience across our platforms.

Technical Leadership That Raises the Bar

• Mentor SREs, platform engineers, and developers across the organisation.
• Champion automation, observability, DevSecOps, and modern operational practices.
• Influence engineering culture and architectural direction.

Operational Excellence

• Own and lead high-severity incident response with calm, clarity, and technical depth.
• Run world-class post-incident reviews and drive meaningful, measurable improvements.
• Strengthen monitoring, alerting, on-call practices, and reliability processes.
• Support resilience validation through load testing, stress testing, and chaos engineering.

Automation, Tooling & Engineering Efficiency

• Build tools and automation that remove toil and accelerate teams.
• Develop CI/CD pipelines and Infrastructure-as-Code environments.
• Drive consistency, repeatability, and self-service across engineering.

Cross-Team Collaboration

• Partner with Security, Platform, and Engineering teams to align reliability with security and resilience goals.
• Lead teams toward better design, operational readiness, and measurable service health.
• Contribute to documentation, runbooks, and operational processes that scale.

Key requirements:

• 5–8+ years in SRE, Platform, Cloud Infrastructure, or operational engineering roles.
• Hands-on experience architecting and improving large-scale, distributed systems.
• Strong coding proficiency in Python, Go, Bash, or similar automation-focused languages.
• Expertise with observability stacks: Datadog, Prometheus, Grafana, OpenTelemetry.
• Deep AWS experience across EC2, EKS, Lambda, VPC, DynamoDB, S3, CloudFront, RDS, IAM, KMS, and more.
• Proficiency with Terraform, CloudFormation, or AWS CDK.
• Incident response leadership and root-cause analysis expertise.
• Excellent documentation and communication skills.
• Strong analytical and troubleshooting abilities.

Bonus

• Experience mentoring or leading engineers within SRE or platform teams.
• Experience with load testing, stress testing, and chaos engineering.
• A passion for uplifting engineering culture through tooling, automation, and reliability-first thinking.

Why Build the Future with Holland & Barrett?

Technology is at the heart of our mission to make health & wellness accessible to everyone. As a Lead SRE, you won\’t just keep systems running — you\’ll design the reliability, resilience, and operational maturity that accelerates our entire business.

We offer:

• A modern engineering culture built on autonomy, experimentation, and learning.
• The chance to create real impact across critical customer and internal platforms.
• A collaborative team that values innovation, continuous improvement, and technical excellence.

If you\’re ready to lead reliability for platforms with massive real-world impact, we\’d love to meet you.

Apply now and help shape the future of H&B Technology.