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About the Role

As a Cloud Network Engineer on the Public Cloud team, you will be a critical enabler of Citi's cloud transformation journey, with a specialized focus on designing, implementing, and managing complex network architectures across our multi-cloud environment (AWS and Google Cloud) and integrating them seamlessly with our on-premise infrastructure. Our team is dedicated to evolving Citi's application and data hosting environments into an integrated, hybrid multi-cloud ecosystem. We focus on building, automating, and optimizing the foundational cloud network infrastructure and services that empower developers to innovate rapidly and securely. In this role, you will design, implement, and maintain scalable, resilient, and secure cloud network platforms and solutions, embodying a "you build it, you run it" philosophy to ensure operational excellence.

Responsibilities

Design, implement, and manage advanced network architectures across AWS and GCP, including VPC/VNet design, subnetting, routing, IP addressing schemes, and network segmentation.
Establish and maintain robust, high-performance, and secure connectivity between on-premise data centers and public cloud environments using technologies such as AWS Direct Connect, Google Cloud Interconnect, VPNs, and SD-WAN integration.
Develop, maintain, and optimize cloud network infrastructure using Infrastructure as Code (IaC) tools such as Terraform, CloudFormation (AWS), and Deployment Manager (GCP). Create reusable modules and blueprints for standardized network deployments.
Configure and manage critical network services including DNS (Route 53, Cloud DNS), Load Balancing (ALB, NLB, Cloud Load Balancing), API Gateways, and Content Delivery Networks (CDNs).
Automate the provisioning, configuration, and management of cloud network resources and services. Develop scripts and tools (e.g., Python, Go, Bash) to streamline network operations, ensure consistency, and improve efficiency.
Embrace a "you build it, you run it" mindset for network services. Take ownership of the reliability, performance, and availability of the cloud network platforms. Implement robust network monitoring, alerting, and logging solutions, and participate in on-call rotations to ensure rapid incident response and resolution for network-related issues.
Implement and enforce network security best practices, including network access control lists (NACLs), security groups, cloud firewalls (AWS WAF, GCP Firewall Rules), and network intrusion detection/prevention systems. Ensure compliance with Citi's policies, industry standards, and regulatory requirements.
Perform advanced network troubleshooting and performance optimization across hybrid and multi-cloud environments.
Create and maintain comprehensive documentation for cloud network architectures, configurations, and operational procedures. Mentor junior engineers and contribute to knowledge sharing within the team.

Requirements

Deep understanding of public cloud services adoption at scale.
Expert-level understanding of AWS/GCP across: Internet Application Hosting - Network Segmentation, Security controls, Network Firewall and Packet Mirroring & Inspection and Content Delivery Networks.
Expert-level understanding of AWS/GCP across: B2B Connectivity - AWS & GCP Experience with Third party connectivity patterns, Cloud B2B Architectures and familiarity with VPN, AWS Privatelinks and Google Cloud Private Service Connect.
Expert-level understanding of AWS/GCP across: Application Resiliency - DNS and DNS Routing, AWS Route53, Load Balancers, Google Cloud CloudDNS, High availability & Resiliency and API platforms
Expert-level understanding of Hybrid cloud connectivity solutions (Direct Connect, Cloud Interconnect, VPNs, SD-WAN).
Expert-level understanding of Networking concepts: TCP/IP, routing protocols (BGP), network segmentation, firewalls, and network security principles.
Expert-level understanding of Network monitoring, logging, and alerting tools in a cloud context.
Demonstrable experience with Infrastructure as Code (IaC) tools such as Terraform, Harness, Tekton, Jenkins.
Demonstrable experience with Test Automation tools such as Terratest, Cucumber, Pytest-BDD, AWS Fault Injection Simulator (FIS), Chaos Mesh.
Familiarity with Agile Development, DevOps, and SRE practices.
Demonstrated ability to quickly learn new technologies and adapt to changing project requirements.
Experience evaluating complex requirements and rationalizing them into a consistent service offering.
Ability to effectively communicate technical concepts to both technical and non-technical audiences.
Proven ability to contribute effectively within a cross-functional team environment.
Public cloud provider network-specific certifications (e.g., AWS Certified Advanced Networking - Specialty, Google Cloud Professional Network Engineer).
Experience with network security tools such as WAF, DDoS protection, and network intrusion detection/prevention systems.
Familiarity with network virtualization and software-defined networking (SDN) concepts.
Experience with container networking (e.g., Kubernetes CNI, service mesh).
Knowledge of compliance frameworks relevant to financial services (e.g., PCI DSS, NIST, ISO 27001).
Experience with network performance testing and optimization tools.

Skills

AWS
GCP
VPC/VNet design
Subnetting
Routing
IP addressing schemes
Network segmentation
AWS Direct Connect
Google Cloud Interconnect
VPNs
SD-WAN
Terraform
CloudFormation
Deployment Manager
DNS
Route 53
Cloud DNS
Load Balancing
ALB
NLB
Cloud Load Balancing
API Gateways
CDNs
Python
Go
Bash
SRE
Network monitoring
Network alerting
Network logging
NACLs
Security groups
AWS WAF
GCP Firewall Rules
TCP/IP
BGP
Harness
Tekton
Jenkins
Terratest
Cucumber
Pytest-BDD
AWS Fault Injection Simulator (FIS)
Chaos Mesh
Agile Development
DevOps
WAF
DDoS protection
Network intrusion detection/prevention systems
Network virtualization
SDN
Kubernetes CNI
Service mesh
PCI DSS
NIST
ISO 27001

Location

London
Belfast

Work Type

Hybrid
Contract

Experience Level

Expert-level understanding of public cloud services adoption at scale
Demonstrable experience with Infrastructure as Code (IaC) tools
Demonstrable experience with Test Automation tools
Experience evaluating complex requirements

About the Company

Citi's cloud transformation journey
Our team is dedicated to evolving Citi's application and data hosting environments into an integrated, hybrid multi-cloud ecosystem.
We focus on building, automating, and optimizing the foundational cloud network infrastructure and services that empower developers to innovate rapidly and securely.