Lead Software & Platform Engineering
Confirmed on the employer's own hiring board on Oct 20, 2026. First seen by Alion on Jul 1, 2026. London Stock Exchange Group scores B on the Alion truth index.
Lead Software Engineer - Reflex Platform Developer (Network Automation)
Role Summary
We are looking for a Lead Reflex Developer to build and evolve a strategic automation platform delivering intent-based, fully automated multi-cloud connectivity services across global network infrastructure.
The Reflex platform acts as the top-layer orchestration and abstraction system, enabling business users to request connectivity services via APIs and UI, while automatically translating requirements into network provisioning workflows involving DNS, IPAM, firewalls, load balancers, and cloud connectivity.
You will play a leading engineering role in designing and implementing scalable, cloud-native microservices that automate end-to-end lifecycle management of network services across AWS, Azure and on-premise environments.
About Reflex
Reflex is LSEG’s automation platform for private multicloud connectivity, reducing provisioning timelines from weeks to minutes.
Key characteristics:
- Intent-driven API model (business-friendly abstraction)
- Fully automated lifecycle: create / update / decommission
- Integration across: Cloud providers (AWS, Azure) Network fabric (Sigma, Delivery Direct Network) ITSM (ServiceNow), orchestration systems, IPAM (InfoBlox)
- Covers: Connectivity provisioning Capacity management Change management IP/DNS lifecycle Performance monitoring
Key Responsibilities
Platform Engineering
- Design and develop microservices-based backend systems for Reflex
- Build and maintain intent-based APIs and orchestration logic
- Implement event-driven workflows for network service automation
- Develop abstract service models (VPC connectivity, VLANs, routing, etc.)
Integration & Automation
- Integrate northbound with: UI layer ServiceNow / business APIs
- Integrate southbound with: Network services (DNS, IPAM, firewalls, LB) Cloud networking constructs
- Deliver Infrastructure-as-Code (IaC) and CI/CD pipelines
Frontend & User Experience
- Develop/refine UI applications (Vue.js / Quasar)
- Enable self-service workflows for Cloud Ops users
Architecture & Design
- Define high-level system design and architecture
- Ensure scalability for global multi-tenant environments
- Apply distributed system best practices
Leadership
- Mentor junior engineers
- Drive engineering standards and design patterns
- Work closely with Product Owners and Architects
Technical Requirements
Backend (Mandatory)
- Java (strong expertise)
- Spring Boot
- Hibernate
- Gradle
- REST API design (extensible, versioned APIs)
Frontend (Mandatory / Flexible)
- JavaScript / TypeScript
- Modern frameworks: Vue.js + Quasar (preferred) OR React / Angular (with willingness to learn Vue)
Cloud & Architecture
- Microservices architecture
- Event-driven systems (Kafka, messaging patterns)
- Distributed systems debugging
- Cloud platforms (AWS, Azure, GCP)
Database
- PostgreSQL
- Strong SQL expertise
- Data modelling for distributed systems
DevOps & Automation
- Git (version control)
- CI/CD pipelines
- Infrastructure as Code (Terraform preferred)
- Agile / Scrum methodologies
Domain Expertise (Highly Valuable)
- Networking fundamentals: TCP/IP, HTTP DNS, IPAM Routing, VLANs
- Cloud networking: VPC/VNet connectivity Private connectivity (Direct Connect / ExpressRoute)
- Network automation & orchestration platforms
Key Skills & Competencies
- Strong analytical and problem-solving skills
- Ability to translate business intent → technical implementation
- Experience with large-scale, high-availability systems
- Excellent communication and collaboration
- Attention to detail and quality-driven mindset
What Makes This Role Unique
- Work on a mission-critical automation platform used globally
- Build systems that eliminate manual network provisioning
- Operate at the intersection of: Software engineering Cloud Network automation
- Influence architecture for future scalable connectivity platforms
Nice to Have
- Kotlin
- Event streaming (Kafka)
- Experience with ServiceNow integration
- Experience in telecoms or financial infrastructure environments
Example Candidate Profile
- 8+ years in software engineering
- Strong backend engineer with exposure to cloud + networking
- Experience building automation platforms or orchestration systems
- Comfortable leading design and mentoring teams
Career Stage:
ManagerLondon 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.