Principal Platform Engineer

Salary: £44,000 - 84,000 per year

Requirements:

• A background in Operations or SRE running highly available, redundant production platforms, with understanding of failure domains, graceful degradation, and the cost of five nines availability
• Deep hands-on experience with AWS, including VPC design, networking, and EKS, and Azure, including AKS, Key Vault, and networking
• Strong networking fundamentals, including TCP/IP, routing concepts, firewalls, load balancing, and hybrid connectivity such as Direct Connect, ExpressRoute, and VPNs
• Production Kubernetes experience at scale, including day-2 operations such as upgrades, capacity, security, and multi-cluster management
• Infrastructure-as-code and automation as a default working style, with experience in Terraform, Ansible, or similar, plus strong scripting in Python, Go, or Bash
• Demonstrable practical use of AI tooling to improve engineering or operational workflows
• Credibility and communication skills to mentor senior engineers and influence design decisions without formal authority
• Understanding of different database technologies
• Experience in trading, exchanges, market data, fintech, or another latency- and availability-sensitive domain is nice to have

Responsibilities:

• Design, build, and operate infrastructure across AWS, Azure, and on-prem environments
• Own core networking design and implementation across cloud environments, including connectivity, routing, DNS, load balancing, firewalls, and private links between cloud and on-prem
• Engineer for high availability through multi-region and multi-AZ architectures, failover design, capacity planning, and disaster recovery
• Build and maintain infrastructure-as-code, CI/CD pipelines, and Kubernetes platforms as products consumed by engineering teams
• Define and drive SLOs, error budgets, and observability standards across the platform
• Take part in post-incident reviews and drive resulting reliability work to completion
• Continuously reduce toil through automation
• Identify, prototype, and productionise AI-assisted workflows across the department, including incident triage and summarisation, runbook automation, log and alert analysis, change-risk assessment, and internal knowledge tooling
• Use AI-assisted engineering tools as a first-class part of our workflow, and coach the team to do the same safely and effectively
• Establish sensible guardrails for AI use in a regulated, availability-critical environment
• Act as a mentor to engineers across the Platform and Operations teams
• Review architectures, challenge assumptions, and ensure new services are built to be operable, observable, and resilient from day one
• Contribute to the technical roadmap for the platform function, balancing reliability investment against delivery

Technologies:

• AI
• AWS
• Ansible
• Azure
• Bash
• CI/CD
• Cloud
• Kubernetes
• LLM
• Load Balancing
• Python
• Security
• TCP/IP
• Terraform
• Copilot
• DevOps

More:

We are hiring a Principal Platform Engineer to be a senior technical anchor in our Platform/Operations function. This is a 70% hands-on engineering role where you will help design, build, and operate the infrastructure behind a global trading platform, while also acting as a technical mentor and design authority across the wider team. A core part of the role is leading our adoption of AI within operations, using LLM-based tooling, agentic workflows, and automation to reduce toil, accelerate incident response, and increase the operational leverage of the whole department. We are a company that values a collegial work environment in which all individuals are treated with dignity and respect and which reflects the diversity of the community in which we operate. We provide accommodations for applicants and employees who require it. The role is based in London at 2 Gresham Street and is full time.

last updated 35 week of 2026