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Python Developer

senior · Technology / Software Development

Job Description

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.

Assistant Vice President Expectations

• To advise and influence decision making, contribute to policy development and take responsibility for operational effectiveness. Collaborate closely with other functions/ business divisions.
• Lead a team performing complex tasks, using well developed professional knowledge and skills to deliver on work that impacts the whole business function. Set objectives and coach employees in pursuit of those objectives, appraisal of performance relative to objectives and determination of reward outcomes
• 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 lead collaborative assignments and guide team members through structured assignments, identify the need for the inclusion of other areas of specialisation to complete assignments. They will identify new directions for assignments and/ or projects, identifying a combination of cross functional methodologies or practices to meet required outcomes.
• Consult on complex issues; providing advice to People Leaders to support the resolution of escalated issues.
• Identify ways to mitigate risk and developing new policies/procedures in support of the control and governance agenda.
• Take ownership for managing risk and strengthening controls in relation to the work done.
• Perform work that is closely related to that of other areas, which requires understanding of how areas coordinate and contribute to the achievement of the objectives of the organisation sub-function.
• Collaborate with other areas of work, for business aligned support areas to keep up to speed with business activity and the business strategy.
• Engage in complex analysis of data from multiple sources of information, internal and external sources such as procedures and practises (in other areas, teams, companies, etc).to solve problems creatively and effectively.
• Communicate complex information. 'Complex' information could include sensitive information or information that is difficult to communicate because of its content or its audience.
• Influence or convince stakeholders 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.

Join Barclays as a Python Developer, contributing to the design and enhancement of robust Python web applications while working on existing platforms to improve reliability and developer workflows. Leveraging strong quantitative skills, I apply data-driven insights to optimize system performance, support engineering excellence, and drive scalable solutions across complex, high-impact environments.

To be successful, you should have:

• Experience with Python web applications using FastAPI, or Flask
• Proven experience designing and implementing RESTful APIs at scale
• Strong understanding of async/await patterns and concurrent programming
• Proficient in SQL with Oracle
• Experience designing normalized schemas and writing optimized queries
• Knowledge of database indexing, transactions, and performance tuning
• Deep understanding of OOP principles (SOLID, DRY, composition over inheritance)
• Practical application of design patterns (Factory, Strategy, Repository, etc.)
• Experience with test-driven development (pytest, unittest)
• Experience working with a senior Python engineering tech stack and best practices

Some other highly valued skills may include:

• Docker containerization and multi-stage builds
• Kubernetes deployments, services, and configuration management using Helm
• GitLab CI/CD pipeline configuration and optimization
• Git workflows (merge requests, code review, branching strategies)
• ELK Stack (Elasticsearch, Logstash, Kibana) for log aggregation or Prometheus/Grafana for metrics/alerting
• OpenShift or similar container platforms
• Message queues (RabbitMQ, Kafka, Redis)

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

This role is based in London.