Staff Site Reliability Engineer

Harnham; United States; Remote; USD 150,000 - 230,000; Full time

Benefits offered by this job

Flexible remote working model acrossEU

4.5-day working week

Additional leave benefits

Wellbeing and mental health support

Inclusive parental leave policies

Opportunity to shape infrastructure at

scale journey

Job summary

Harnham is recruiting a Staff Site Reliability Engineer to define reliability strategy for a large-scale cloud platform. You will drive resiliency, observability and performance across multi-region AWS environments, shaping technical direction and incident response.

You will mentor engineers, lead architecture decisions and collaborate with teams to improve CI/CD, automation and cost efficiency while balancing performance and capacity planning.

Qualifications

• Designing and operating large-scale AWS infrastructure
• Expertise in SRE, platform engineering or cloud leadership
• Terraform and IaC principles
• Experience with Kubernetes (EKS)
• Strong observability, monitoring and incident practices
• Support for high-volume, low-latency distributed systems
• Coding and automation in Python or similar
• Influence architecture decisions across teams
• Mentoring engineers and promoting best practices
• Understanding FinOps and cloud cost optimisation

Responsibilities

• Drive reliability, scalability and performance initiatives across multi-region AWS environments
• Lead architecture decisions for systems handling millions of requests per second
• Improve platform resilience and latency
• Own major incident response and post-incident improvements
• Partner with engineering to enhance CI/CD, automation and developer experience
• Balance reliability, performance and cost through FinOps and capacity planning
• Mentor engineers and contribute to engineering standards
• Act as a key technical leader within the infrastructure function

Skills

AWS infrastructure

Site Reliability Engineering

Terraform

Kubernetes (EKS)

Observability & monitoring

Distributed systems

Python

Incidents & post-incident improvements

FinOps / cost optimisation

Mentoring engineers

Tools

Terraform

Kubernetes

Job description

If you\'re excited by the challenge of scaling high-volume distributed systems and shaping reliability strategy at a business entering its next phase of growth, this is an opportunity to make a genuine impact. You\'ll join a highly technical engineering environment where reliability, performance, scalability and cost optimisation are critical to success.

The Company

They are a fast-growing technology business operating a large-scale cloud platform serving millions of transactions every second. Following a period of strong commercial growth, the organisation is investing heavily in its infrastructure and engineering capabilities to support new products, increased platform adoption and significantly greater scale.

Their engineering culture values ownership, collaboration and technical excellence. With a modern AWS-based environment and a strong focus on automation, they offer the chance to work on complex challenges that directly influence business outcomes.

The Role

As a Staff Site Reliability Engineer, you will help define the reliability strategy and technical direction of a large-scale cloud platform.

Responsibilities include:

• Driving reliability, scalability, observability and performance initiatives across a multi-region AWS environment
• Leading architecture decisions for systems handling millions of requests per second
• Improving platform resilience, latency and operational efficiency
• Owning major incident response processes and driving post-incident improvements
• Partnering with engineering teams to enhance CI/CD, automation and developer experience
• Balancing reliability, performance and infrastructure cost through FinOps and capacity planning initiatives
• Mentoring engineers and influencing engineering standards across the organisation
• Acting as a key technical leader within the infrastructure function

Your Skills & Experience

• Strong commercial experience designing and operating large-scale AWS infrastructure
• Expertise in Site Reliability Engineering, platform engineering or cloud infrastructure leadership
• Deep knowledge of Terraform and Infrastructure as Code principles
• Experience with Kubernetes, particularly EKS environments
• Strong understanding of observability, monitoring, incident management and reliability practices
• Experience supporting high-volume, low-latency distributed systems
• Strong coding and automation capabilities, ideally including Python or similar programming languages
• Ability to influence architecture decisions and drive technical initiatives across multiple teams
• Experience mentoring engineers and promoting operational best practice
• Understanding of cloud cost optimisation and FinOps principles

What They Offer

• Flexible remote working model across the EU
• 4.5-day working week
• Additional leave benefits
• Wellbeing and mental health support
• Inclusive parental leave policies
• The opportunity to help shape infrastructure strategy during a major scaling journey
• Significant scope for technical leadership and career progression