Python Developer

Join Barclays as a Python Developer, where you will be responsible for designing and building production-grade APIs and backend services that support scalable, high-performance data platforms. You will develop and maintain client-facing SDKs, implement efficient caching strategies, and optimise systems for high throughput and low latency.

To be successful in this role, you should have:

• Strong Python engineering skills building production‑grade APIs and backend services (REST/async patterns, testing, packaging).
• Experience designing and maintaining client‑facing SDKs (versioning, backward compatibility, documentation, developer usability).
• Hands‑on experience building and operating caching layers for performance and scale (e.g. Redis/Memcached; TTLs, eviction, consistency).

Additional highly valued skills include:

• Experience with high‑throughput, low‑latency systems and API performance optimisation (profiling, concurrency, async IO).
• Familiarity with service reliability practices (observability, metrics, error handling, retries, graceful degradation).
• Experience with cloud‑native deployment and automation (containers, CI/CD, Infrastructure as Code).
• Experience working with kdb+ stack

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, and digital and technology skills, as well as job‑specific technical expertise.

This role is based in London.

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

• 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.