Senior Infra Engineer - Remote, Low-Latency Trading Network

Reactive Markets Limited; United States; Remote; USD 119,000 - 172,000; Full time

Benefits offered by this job

Private health insurance

Pension

Life insurance

Dental/optical cashback

Cycle to work

Remote-friendly hours

Job summary

Reactive Markets Limited is seeking a Senior Infrastructure Engineer to run and grow our global trading platform’s network and cloud estate. The role is remote (UK-based) with occasional on-site work at our data centres in London/Slough, and growth plans including Tokyo.

You’ll own low-latency networking, multi-region AWS connectivity, and on-prem/colo infrastructure. Experience with HFT-like environments, cross-connects, and IaC is essential. We value hands-on leadership and clear documentation.

Qualifications

• 4+ years running production infrastructure in a latency-sensitive environment such as HFT, an exchange, market data or bank trading infrastructure.
• Strong networking: hands-on routing and switching (MLAG, LACP, VLANs), BGP in production, and low-latency behavior understanding.
• Colocation experience: cabinets, cross-connects, remote hands and vendor management.
• Solid Linux (RHEL) and TCP/IP, tracing issues from the wire to the application.
• Infrastructure as code and containers as default working method.

Responsibilities

• Manage and grow the network and cloud estate behind our trading platform.
• Bring new sites to production readiness, starting with Tokyo.
• Maintain and automate hybrid AWS connectivity, including Direct Connect and failover.
• Monitor, alert, and document incidents; create runbooks and post-incident reviews.
• Forecast capacity and plan timelines with TechOps and engineering.

Skills

Low-latency networking

Linux (RHEL)

Networking protocols

Ansible

Git

Terraform

AWS networking

BGP

Cross-connects

Colocation

Python

Project management

Tools

Ansible

Git

Terraform

Job description

Reactive Markets Limited is seeking a Senior Infrastructure Engineer to run and grow our global trading platform’s network and cloud estate. The role is remote (UK-based) with occasional on-site work at our data centres in London/Slough, and growth plans including Tokyo.

You’ll own low-latency networking, multi-region AWS connectivity, and on-prem/colo infrastructure. Experience with HFT-like environments, cross-connects, and IaC is essential. We value hands-on leadership and clear documentation.