Windows Engineer – Buy-side Investment Firm | London

A buy-side investment firm are seeking a Windows Engineer to join its core technology function in London. This role supports a mission-critical Windows estate that underpins trading, operations, and data teams across the global business.

You’ll work closely with infrastructure, security, cloud, and end-user teams to design, build, and support a highly available Windows environment in a fast-paced trading setting. This is an ideal role for a hands-on Windows Engineer who enjoys ownership, technical depth, and working close to the business without the intensity of investment banking.

Why Join This Firm?

This is one of the most stable and well-regarded names within its sector, with some of the strongest retention rates in the market. Employees consistently highlight the following reasons for long tenures:

• Friendly, family-like culture – the firm actively hires people who align with a collaborative and respectful environment
• Exceptional internal mobility – as well as upwards progression there are regular opportunities for cross team moves.
• Dedicated personal training budget – supporting certifications, cross-skilling, and long-term development
• Balanced working culture – high performance without the burnout typically associated with investment banking
• Great company size (c.800 people) – large enough for ongoing investment and greenfield projects, small enough that the London office sits on one floor with direct access to senior leadership

Role Overview

As a Windows Engineer, you’ll take responsibility for the stability, security, and evolution of the firm’s Windows infrastructure.

Key responsibilities include:

• Supporting and developing the Windows Server estate across on-prem and cloud environments
• Managing Active Directory, Group Policy, DNS, DHCP, and core identity services
• Contributing to platform upgrades, lifecycle management, and standardisation initiatives
• Automating operational tasks using PowerShell to improve reliability and efficiency
• Supporting security hardening, patching, and compliance initiatives
• Collaborating with cloud, networking, EUC, and application teams on infrastructure projects
• Troubleshooting complex Windows-related incidents in a high-availability environment
• Producing clear documentation and contributing to operational best practice

Required Experience

• Strong hands-on experience as a Windows Engineer / Infrastructure Engineer
• Deep knowledge of Windows Server (2016/2019/2022)
• Active Directory experience
• PowerShell exposure for automation and administration
• Experience with patching, monitoring, and server lifecycle management
• Solid understanding of networking fundamentals (DNS, TCP/IP, authentication flows)
• Experience operating in high-availability or business-critical environments
• Comfortable working closely with both technical teams and business stakeholders
• Bonus: Azure, Pure Storage, VMware