Job Description Senior Software Engineer - Python Watford, Hertfordshire (Hybrid) £70,000 - £75,000 per annum + Excellent benefits On behalf of an industry Leading organisation, I am seeking a Senior Software Engineer - Python 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. The business is pleased to offer this role on a hybrid basis with 2-3 days in office; therefore, you must be within easy reach of their Watford-based offices. Responsibilities: Collaborate closely with Principal Engineers. Provide technical guidance, insight, and mentorship to other engineers. Participate in peer reviews and offer constructive feedback. Support product stakeholders in shaping the roadmap. Contribute to best practices and engineering standards across the wider engineering organization. Participate in modern software development practices including pairing, code reviews, documentation reviews, testing, and continuous delivery. Translate requirements into implementable technical specifications and tasks. Maintain accurate and reliable technical documentation. Provide regular updates on progress, timelines, risks, and dependencies. Lead troubleshooting and incident resolution, including occasional out-of-hours support. Ensure unit tests are implemented and fit for purpose. Research and evaluate new technologies that could benefit the organisation. Design and develop high-quality Python software that meets complex business needs. Ensure code, documentation, and testing align with engineering standards. Deliver solutions that meet acceptance criteria, performance expectations, and operational reliability. Integrate products with monitoring and support tooling. Experience/Skills required: Experienced Python Developer who can make sound trade-offs, design for scale, and contribute to complex systems without over-engineering. Strong engineering judgement and real-world delivery experience. Senior-level experience designing and building production Back End services in Python (3.10+). Strong background in high-throughput, message-based or event-driven systems. Proven experience building API-first services, with a focus on performance, reliability, and maintainability. Python Back End development, primarily using FastAPI and modern API patterns. Strong understanding of RESTful API design, schema validation, and OpenAPI/Swagger. Experience working with messaging and eventing platforms such as Kafka, RabbitMQ, Azure Service Bus, MQTT, or similar. Cloud-native development experience is essential (ideally on Azure). Hands-on experience with containerisation (Docker) and orchestration platforms such as Kubernetes. Exposure to building and supporting shared or internal libraries used across multiple services.
Senior Software Engineer employer: CSL
CSL Seqirus is an excellent employer that fosters a collaborative and inclusive work culture, making it an ideal place for a Global Financial Analyst. With a strong focus on employee growth and development, the company offers numerous opportunities for professional advancement while providing a hybrid working model that promotes work-life balance. Located in Speke, Liverpool, employees benefit from a vibrant community and the chance to engage with diverse teams across the globe, enhancing both personal and professional experiences.
