Senior Python Developer

Job Description

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Python Developer

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Watford, Hertfordshire (Hybrid)

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£70,000 - £75,000 per annum + Excellent benefits

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On behalf of an industry Leading organisation, I am seeking a Python Developer with strong production experience building high-throughput, message-driven platforms. This role suits someone comfortable working on real-world, always-on systems where reliability, performance, and clear engineering judgement matter as much as clean code.

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The business is pleased to offer this role on a hybrid basis with a non-negotiable 3 days in office; therefore, you must be within easy reach of their Watford-based offices.

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Responsibilities:

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• Collaborate closely with Principal Engineers.

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• Provide technical guidance, insight, and mentorship to other engineers.

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• Participate in peer reviews and offer constructive feedback.

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• Support product stakeholders in shaping the roadmap.

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• Contribute to best practices and engineering standards across the wider engineering organization.

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• Participate in modern software development practices including pairing, code reviews, documentation reviews, testing, and continuous delivery.

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• Translate requirements into implementable technical specifications and tasks.

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• Maintain accurate and reliable technical documentation.

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• Provide regular updates on progress, timelines, risks, and dependencies.

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• Lead troubleshooting and incident resolution, including occasional out-of-hours support.

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• Ensure unit tests are implemented and fit for purpose.

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• Research and evaluate new technologies that could benefit the organisation.

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• Design and develop high-quality Python software that meets complex business needs.

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• Ensure code, documentation, and testing align with engineering standards.

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• Deliver solutions that meet acceptance criteria, performance expectations, and operational reliability.

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• Integrate products with monitoring and support tooling.

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Experience/Skills required:

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• Experienced Senior Engineer who can make sound trade-offs, design for scale, and contribute to complex systems without over-engineering.

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• Strong engineering judgement and real-world delivery experience.

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• Senior-level experience designing and building production Back End services in Python (3.10+).

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• Strong background in high-throughput, message-based or event-driven systems.

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• Proven experience building API-first services, with a focus on performance, reliability, and maintainability.

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• Python Back End development, primarily using FastAPI and modern API patterns.

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• Strong understanding of RESTful API design, schema validation, and OpenAPI/Swagger.

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• Experience working with messaging and eventing platforms such as Kafka, RabbitMQ, Azure Service Bus, MQTT, or similar.

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• Cloud-native development experience is essential (ideally on Azure).

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• Hands-on experience with containerisation (Docker) and orchestration platforms such as Kubernetes.

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• Exposure to building and supporting shared or internal libraries used across multiple services.

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