Lead NSO Developer

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:

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.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.