Cognitive Group | Part of the Focus Cloud Group
Senior Python Developer
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Senior Python Developer
Python Application Development & AWS
Location: UK (Remote)
Contract Type: Outside IR35
Start Date: November 2026
Rate: Dependent on Experience
Security Clearance: Active SC Clearance is required
Eligibility: Candidates must be based in the UK and hold the right to work in the UK.
Overview
A leading technology consultancy is seeking an experienced Senior Python Developer to join a high-profile digital transformation programme. This role focuses on the design, development and enhancement of modern, cloud-based applications, with Python serving as a core technology across both backend and middleware services.
This is a software engineering position requiring an individual with substantial experience building production-grade applications rather than data science or analytics-focused solutions. Successful candidates will have a strong understanding of application architecture, API development, cloud technologies, testing and modern engineering best practices.
Key Responsibilities
- Design, develop and maintain robust Python applications and services within a modern cloud environment.
- Develop backend and middleware components including business logic, integrations and RESTful APIs.
- Support the integration of front-end applications with backend services to deliver seamless user experiences.
- Translate business and technical requirements into scalable, maintainable and reusable software solutions.
- Design and implement secure, high-performing APIs and enterprise integrations.
- Develop solutions that interact with databases, third-party services and internal business systems.
- Build, deploy and support application components within AWS environments.
- Develop comprehensive automated tests to ensure quality, stability and maintainability.
- Troubleshoot and resolve complex application, integration and performance issues.
- Participate in code reviews and contribute to engineering standards, documentation and best practices.
- Work closely with architects, testers, product owners and other developers within agile delivery teams.
- Provide technical guidance and support to colleagues where appropriate.
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Essential Skills & Experience
- Extensive commercial experience developing production-grade applications using Python.
- Strong background building web applications, backend services and middleware solutions.
- Experience designing and developing secure REST APIs, including authentication, authorisation and error handling.
- Strong understanding of multi-tier application architecture and application design principles.
- Experience integrating user interfaces with backend services and APIs.
- Strong AWS experience, including application deployment and operation within cloud-native environments.
- Solid understanding of software engineering principles including object-oriented design, reusable code, design patterns and application security.
- Experience implementing automated testing and developing maintainable, testable software.
- Strong knowledge of Git, CI/CD pipelines and modern development practices.
- Experience working within Agile teams and collaborating across multidisciplinary delivery functions.
- Ability to take ownership of complex technical components from design through development, testing and deployment.
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Candidate Profile
The ideal candidate will be a senior software engineer with deep Python expertise and a proven track record delivering enterprise-grade applications. You will be comfortable working across the full software development lifecycle, contributing to architectural decisions, solving complex technical challenges and delivering high-quality solutions within a collaborative cloud-first environment.
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