Senior AI Platform Engineer

Barclays; Greater London; Hybrid; GBP 120,000 - 160,000; Full time

Job summary

Barclays is seeking a Senior AI Platform Engineer to lead design, delivery, and operational excellence of enterprise AI infrastructure in London. You will own engineering quality and technical direction across core platform subsystems including AI Gateway, inference routing, guardrails, and observability, ensuring security, scalability, and production-grade reliability.

You will drive execution across workstreams, set engineering standards, remove blockers, and coach engineers to grow their

Qualifications

• Experience designing enterprise-scale distributed systems.
• Expert Python (FastAPI/async) or Go/Java for high-throughput systems.
• Deep AWS/EKS/Envoy knowledge including service mesh and multi-tenancy.
• GenAI/Agentic AI experience with LangGraph/LangChain or Google ADK, MCP/A2A protocols, RAG, vLLM serving.

Responsibilities

• Development and delivery of high-quality software solutions using industry-aligned languages, frameworks, and tools, ensuring scalability, maintainability, and performance.
• Collaborate with product managers, designers, and engineers to define requirements and strategies.
• Participate in code reviews and promote a culture of code quality and knowledge sharing.
• Stay informed of industry trends and contribute to technology communities to foster excellence and growth.
• Adhere to secure coding practices to mitigate vulnerabilities and protect data.

Skills

Enterprise-scale architecture

Python/Go/Java

AWS/EKS/Envoy

GenAI/Agentic AI

Tools

Envoy Proxy

LangChain

LangGraph

AWS

Job description

Join Barclays as a Senior AI Platform Engineer, where you will lead the design, delivery, and operational excellence of our enterprise AI infrastructure. You will own the engineering quality and technical direction across core platform subsystems including the AI Gateway, inference routing, guardrails, and observability - ensuring they are secure, scalable, and production-grade.

This role combines technical leadership with hands-on delivery. You will drive execution across workstreams, set engineering standards, remove blockers for the team, and coach engineers to grow their skills and autonomy.

To be successful as a Senior AI Platform Engineer, you must have the following essential skills;

• Platform/infra architecture at enterprise scale — distributed systems, active-active, failover patterns
• Expert Python (FastAPI/async) or Go/Java — high-throughput, low-latency production systems
• Deep AWS/EKS/Envoy — Bedrock, IAM, Aurora, CloudFormation, GPU scheduling, multi-tenancy, service mesh (Istio), envoy
• GenAI/Agentic AI — LangGraph/LangChain or Google ADK, MCP/A2A protocols, prompt engineering, RAG, vLLM serving

Some other highly valued skills may include;

• AI safety/guardrails — prompt injection detection, PII redaction, content filtering
• AI security frameworks — NIST AI RMF, MITRE ATLAS, OWASP LLM Top 10
• Envoy Proxy (xDS API, WASM filters, AI Gateway extensions)
• Financial services background — regulatory, data residency, compliance

You may be assessed on the key critical skills relevant for success in role, such as risk and controls, change and transformation, business acumen strategic thinking and digital and technology, as well as job-specific technical skills

Location is London

Purpose of the role

To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues.

Accountabilities

• Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable, maintainable, and optimized for performance.
• Cross-functional collaboration with product managers, designers, and other engineers to define software requirements, devise solution strategies, and ensure seamless integration and alignment with business objectives.
• Collaboration with peers, participate in code reviews, and promote a culture of code quality and knowledge sharing.
• Stay informed of industry technology trends and innovations and actively contribute to the organization’s technology communities to foster a culture of technical excellence and growth.
• Adherence to secure coding practices to mitigate vulnerabilities, protect sensitive data, and ensure secure software solutions.
• Implementation of effective unit testing practices to ensure proper code design, readability, and reliability.

Vice President Expectations

• To contribute or set strategy, drive requirements and make recommendations for change. Plan resources, budgets, and policies; manage and maintain policies/ processes; deliver continuous improvements and elevate breaches of policies/procedures..
• If managing a team, they define jobs and responsibilities, planning for the department’s future needs and operations, counselling employees on performance and contributing to employee pay decisions/changes. They may also lead a number of specialists to influence the operations of a department, in alignment with strategic as well as tactical priorities, while balancing short and long term goals and ensuring that budgets and schedules meet corporate requirements..
• If the position has leadership responsibilities, People Leaders are expected to demonstrate a clear set of leadership behaviours to create an environment for colleagues to thrive and deliver to a consistently excellent standard. The four LEAD behaviours are: L – Listen and be authentic, E – Energise and inspire, A – Align across the enterprise, D – Develop others..
• OR for an individual contributor, they will be a subject matter expert within own discipline and will guide technical direction. They will lead collaborative, multi-year assignments and guide team members through structured assignments, identify the need for the inclusion of other areas of specialisation to complete assignments. They will train, guide and coach less experienced specialists and provide information affecting long term profits, organisational risks and strategic decisions..
• Advise key stakeholders, including functional leadership teams and senior management on functional and cross functional areas of impact and alignment.
• Manage and mitigate risks through assessment, in support of the control and governance agenda.
• Demonstrate leadership and accountability for managing risk and strengthening controls in relation to the work your team does.
• Demonstrate comprehensive understanding of the organisation functions to contribute to achieving the goals of the business.
• Collaborate with other areas of work, for business aligned support areas to keep up to speed with business activity and the business strategies.
• Create solutions based on sophisticated analytical thought comparing and selecting complex alternatives. In-depth analysis with interpretative thinking will be required to define problems and develop innovative solutions.
• Adopt and include the outcomes of extensive research in problem solving processes.
• Seek out, build and maintain trusting relationships and partnerships with internal and external stakeholders in order to accomplish key business objectives, using influencing and negotiating skills to achieve outcomes.

All colleagues will be expected to demonstrate the Barclays Values of Respect, Integrity, Service, Excellence and Stewardship – our moral compass, helping us do what we believe is right. They will also be expected to demonstrate the Barclays Mindset – to Empower, Challenge and Drive – the operating manual for how we behave.