Full Stack Engineer

Liberty Global Plc; City of Westminster; On-site; GBP 90,000 - 130,000; Full time

Job summary

Liberty Global in the UK is seeking a Platform Design & Architecture leader to own critical platform components, guide integration patterns, and drive measurable improvements in performance and security.

You will lead architecture reviews, collaborate with AI/ML, DevOps, and Product teams, and ensure production readiness through robust governance, documentation and runbooks.

Qualifications

• Experience delivering complex platform components at scale.
• Ability to design data flows and integration patterns.
• Strong emphasis on code quality, testing and observability.

Responsibilities

• Design and own critical platform components aligned with reference architecture.
• Lead architecture reviews and design sessions for key platform features.
• Define integration patterns across services to ensure reliable, scalable operation.
• Write production-ready code across backend and frontend and infrastructure as code.
• Deliver end-to-end features with design, build, test and production deployment.
• Champion engineering standards, CI/CD, security and observability.

Skills

Full stack engineering

Distributed systems design

Cloud-native infrastructure

DevOps practices

Code reviews

Tools

Python

Java

Kubernetes

AWS

CI/CD

Job description

Platform Design & Architecture

• Design and own critical platform components, contributing to the overall architecture and ensuring consistency with the reference architecture set by the VP Software Engineering.
• Evaluate and propose solutions to complex technical challenges, balancing performance, scalability, security and maintainability.
• Lead architecture reviews and technical design sessions for key platform features, bringing depth and rigour to the process.
• Define integration patterns and data flows across platform services, ensuring components work together reliably at scale.

Engineering & Delivery

• Write production-quality code across the full stack - from backend services and APIs through to front-end interfaces and infrastructure as code.
• Deliver features and platform capabilities end to end, from design through build, test and deployment into production.
• Contribute to production readiness: documentation, runbooks, monitoring and observability - ensuring nothing ships until it's genuinely ready.
• Maintain and improve existing platform components, addressing technical debt and performance issues with clear prioritisation.

Standards & Quality

• Champion engineering best practices across the team: code quality, testing, CI/CD, security, and observability.
• Conduct thorough code and architecture reviews, providing constructive, evidence-based feedback that raises the standard.
• Contribute to and help maintain the engineering standards and guardrails established at VP level, making them practical and usable day to day.

Build Partner Engagement

• Work alongside build partners on platform delivery, providing technical direction and reviewing their designs and code to the same standard as internal work.
• Identify and flag risks or gaps in partner delivery early, feeding back to the VP Software Engineering with clear, actionable recommendations.

Collaboration & Knowledge Sharing

• Collaborate closely with AI/ML, DevOps, Infrastructure and Product teams to deliver integrated platform capabilities.
• Share technical knowledge across the engineering organisation - through documentation, internal talks, or hands‑on pairing - building capability and reducing single points of failure.

WHAT SUCCESS LOOKS LIKE (6-12 MONTHS)

• Key platform components designed, built and running in production with strong stability, performance and security outcomes.
• Architecture decisions made with clear technical rationale, consistently documented and applied across the platform.
• Code and design reviews that visibly raise the quality bar - the team builds better because of your involvement.
• Build partner output reviewed and challenged effectively, with early identification of risks and clear escalation when needed.
• Engineering standards embedded in day-to-day practice, not just documented on a page.

Exp of hands-on full stack engineering experience, delivering complex platforms in enterprise environments.

• Strong proficiency across the full stack - backend (Python, Java or equivalent), frontend frameworks, APIs, databases and infrastructure as code.
• Depth in distributed systems design: you understand how to build services that scale, fail gracefully and recover quickly.
• Experience working with cloud-native infrastructure (AWS, GCP or Azure) and container orchestration (Kubernetes or equivalent).
• Proven ability to translate complex architectural requirements into clear, deliverable engineering plans.
• Strong experience in code and architecture review - giving and receiving feedback that improves the work.
• Comfortable working in fast-paced delivery environments with clear prioritisation and a bias for shipping.
• Experience collaborating with or reviewing the output of SI / vendor build partners.

Preferred

• Experience building or contributing to AI/ML platforms - particularly integrating LLMs, speech, or multimodal models into production systems.
• Familiarity with data pipelines, data quality processes and the infrastructure that supports AI/ML at scale.
• Experience with DevOps, CI/CD pipelines and observability tooling.
• Exposure to telecom or large-scale consumer-facing platforms.

Technical Depth & Judgement

• Consistently makes sound technical decisions, balancing short-term delivery with long-term platform health.
• Goes deep into complex problems - doesn't stop at the surface, finds the right answer and explains why.

Quality & Standards

• Holds themselves and others to a high bar on code quality, security and production readiness.
• Makes engineering standards better by making them practical - not just written, but followed.

Collaboration & Communication

• Works effectively across teams - engineering, product, build partners - and communicates technical decisions clearly.
• Shares knowledge generously: documentation, pairing, review - builds the team up, doesn't hoard expertise.

a Pragmatism & Delivery

• Balances doing things right with doing things fast - pragmatic about trade-offs, clear about where corners cannot be cut.
• Owns their delivery end to end and takes pride in shipping things that work, not just things that are finished.

Liberty Global is a world leader in converged broadband, video and mobile communications services. We deliver next-generation products through advanced fibre and 5G networks that connect 85 million subscribers across Europe and the United Kingdom. Our businesses operate under some of the best-known consumer brands, including Virgin Media-O2 in the UK, VodafoneZiggo in The Netherlands, Telenet in Belgium, Sunrise UPC in Switzerland, Virgin Media in Ireland and UPC in Eastern Europe.

Our consolidated businesses generate annual revenue of more than $7 billion, while our joint ventures in the U.K. and the Netherlands generate combined annual revenue of more than $17 billion. Liberty Global Ventures, our global investment arm, has a portfolio of more than 50 companies across content, technology and infrastructure, including strategic stakes in companies like Plume, ITV, Lions Gate, Univision, the Formula E racing series and several regional sports networks.