Lead NSO Developer

Description du poste:

Lead Cisco NSO Developer (Python / MAAPI / Service Provider Networks)

Job Profile Summary

As a Lead Individual Contributor (IC), this role is responsible for solving complex technical problems and guiding teams through code, architecture, and design decisions within the Network Automation domain.
You will:
* Define and own technical direction for Cisco NSO-based automation
* Lead architecture and implementation of scalable, reusable solutions
* Raise engineering standards through hands-on leadership, mentorship, and reuse
* Deliver high-quality automation solutions that accelerate delivery and reduce duplication across the REFLEX platform

Role Purpose

We are seeking a Lead Cisco NSO Developer / Architect with deep expertise in:
* Cisco NSO (6.x)
* Python development
* MAAPI-driven service implementation (critical requirement)
This role sits within the Network Automation team and drives the evolution of REFLEX, an intent-based automation platform enabling fully automated, multi-cloud network connectivity provisioning across global infrastructure.

Key Responsibilities

Technical Leadership & Ownership

* Own the technical direction and architecture of NSO-based automation systems
* Lead design and delivery of template-less services using MAAPI
* Establish best practices for scalable, reusable service models
* Mentor engineers and guide design decisions across teams

Cisco NSO & Automation Development

* Develop production-grade services using: Python (maapi, requests, netaddr) YANG models
* Implement: Stacked and composite services Full service lifecycle (CRUD ownership model) Transaction-safe, idempotent workflows
* Integrate NSO with broader ecosystem via: RESTCONF / APIs Mid-tier orchestration (MIND layer)

REFLEX Platform Contribution

Work across layers of the automation stack:
* REFLEX (UI/API layer)
User-facing APIs, ServiceNow integration, orchestration entry point
* MIND (Logic layer)
Intent validation, capacity management (VLANs, ASNs), workflow orchestration
* NSO (Execution layer)
Enforces intended state across devices using service-driven configuration

Network & Service Modeling

* Translate business intent into network configurations, including: BGP/MPLS L3VPN / EVPN VRFs, VLANs, interface provisioning
* Automate multi-cloud connectivity across: AWS, Azure, GCP Data centers and colocation facilities

Software Engineering Practices

* Drive high-quality engineering standards: Unit testing (pytest) Integration testing (Robot Framework)
* Contribute to: CI/CD pipelines (GitLab) Containerized deployments (Docker)
* Promote: Code reuse Observability Secure, scalable design

Competencies (Aligned to Lead IC Expectations)

Technical Excellence

* Hands-on expert in Cisco NSO, MAAPI, and Python
* Drives improvements in: Scalability Resilience Observability
* Guides team-level architecture decisions using domain expertise

Customer Focus

* Designs systems aligned with real-world usage and operational needs
* Takes ownership of issues impacting service delivery
* Uses feedback and operational data to continuously improve automation

Risk Management

* Builds secure, resilient automation systems
* Evaluates trade-offs in: Architecture Network design Service modeling
* Ensures safe and reliable service deployment at scale

Leadership

* Leads through hands-on engineering and technical influence
* Mentors team members and raises engineering capability
* Drives consistency, quality, and reuse across solutions

Analytical Thinking

* Uses data-driven approaches to validate design assumptions
* Improves systems through: Measurement Experimentation Iteration

Adaptability

* Challenges legacy approaches and introduces improved methods
* Drives continuous improvement across platforms and practices
* Invests in personal and team-level technical growth

Communication

* Clearly articulates: Architecture decisions Design trade-offs Technical strategy
* Bridges communication between technical and non-technical stakeholders

Required Skills & Experience

Core Technical Skills

* Cisco NSO (Expert) Strong MAAPI experience (mandatory) Template-less service design YANG modelling
* Python (advanced) Automation frameworks Testing (pytest, Robot)

Networking Expertise

* Service Provider Networking: BGP/MPLS, EVPN
* Platforms: Cisco IOS-XR (ASR9K, NCS) Cisco NX-OS (Nexus 9K) Arista EOS

Automation & Tools

* REST APIs / RESTCONF
* GitLab CI/CD
* Linux
* Docker

Cloud & Infrastructure

* AWS (EC2, S3, networking fundamentals)
* Multi-cloud networking concepts

What You'll Deliver

* Fully automated intent-based network services
* Scalable multi-cloud connectivity automation
* Reduced provisioning time from weeks to minutes
* Production-grade network automation used across global infrastructure

Summary

This is a senior leadership role for a highly technical NSO expert who:
* Specialises in MAAPI-based service development
* Understands service provider-grade networks at scale
* Can architect and deliver end-to-end automation platforms
* Drives engineering excellence through hands-on leadership

Career Stage:Manager

London Stock Exchange Group (LSEG) Information:
Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

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