Senior Site Reliability Engineer

Site Reliability Engineer (L3) – Windows Infrastructure

Location: London, UK

Corporate Title: Assistant Vice President / Vice President

Client Profile: Global Tier-1 Financial Institution

Position Type: Full-time, Permanent

Role Overview

On behalf of our client - a leading global investment bank and financial services institution - we are seeking an experienced L3 Site Reliability Engineer to join their London-based Infrastructure SRE team. In this role, you will play a key part in driving operational excellence, automation, and continuous service improvement across the firm's core banking and securities platforms. You will act as a senior technical escalation point, responsible for eliminating operational toil, optimizing low-latency Windows systems, and implementing robust Infrastructure as Code (IaC) solutions within a highly regulated enterprise environment.

Key Responsibilities

• Automation & IaC: Eliminate manual, repetitive tasks by developing software, self-service tools, and Infrastructure as Code using PowerShell, Python, Ansible, and Terraform.
• System Optimization & Reliability: Deep-dive into system internals to tune low-latency Windows infrastructure, manage resource distribution, and establish actionable Service Level Objectives (SLOs).
• L3 Escalation & RCA: Serve as an ultimate technical escalation point for production incidents, leading detailed Root Cause Analyses (RCAs) to build permanent remediations.
• Monitoring & Tooling: Build proactive monitoring solutions focused on early symptom detection rather than post-outage alerts.
• Collaboration & Security: Partner with application, development, and risk teams to execute safe release procedures, remediate technical debt, and ensure adherence to CIS security benchmarks and audit controls.

Essential Skills & Qualifications

• Windows Internals: Deep expertise in Windows Server internals, Active Directory, DNS, DHCP, Kerberos, and performance tuning for low-latency systems.
• Scripting & IaC: Strong hands-on experience with PowerShell, Python, or C#, alongside Infrastructure as Code frameworks (Ansible, Terraform) and version control (Git).
• CI/CD & DevOps: Proven background in CI/CD pipelines (Jenkins, TeamCity) and modern SRE methodologies.

Desirable Experience

• Container orchestration tools such as Docker and Kubernetes.
• Public/hybrid cloud platforms (Azure, AWS, or GCP).
• Enterprise database systems (SQL Server, Oracle) or virtualized platforms (Nutanix, VMware).

If this is of interest to you, do not hesitate and apply!