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Senior Test Automation Engineer (Python, API, Linux – Billing / Rating Systems)
UK – Remote / Hybrid | Permanent

We are recruiting a Senior Test Automation Engineer to join an engineering team building large-scale backend platforms used for billing, rating, and high-volume transaction processing across telecoms and financial-grade systems.

This is a backend-focused automation role centred on Python, APIs, and Linux environments. It is not a UI automation role and not a manual QA position.

Responsibilities

Design, build, and maintain Python-based automation frameworks for backend services

Develop and execute automated tests for APIs and service integrations

Create coverage for regression, negative, and backward-compatibility scenarios

Analyse requirements and define test strategies and test plans for complex backend systems

Investigate failures using logs, metrics, and debugging tools in Linux environments

Work closely with engineers to identify root causes and improve testability and reliability

Support testing of systems deployed in cloud and distributed environments

Essential Experience

Strong, hands-on experience in Python test automation

Proven background testing backend services and APIs

Confident working in Linux environments (CLI, logs, troubleshooting)

Experience testing billing, rating, charging, payments, or financial transaction systems

Solid understanding of authentication and authorisation (OAuth2, JWT, API keys, etc.)

Experience with CI/CD pipelines, version control, and defect tracking tools

Desirable Experience

Telecoms platforms (charging, mediation, invoicing)

SDK testing and contract testing

Performance or load testing exposure

Containers and cloud platforms (Docker, Kubernetes, AWS/Azure/GCP)

This role is not suitable for:

UI automation–focused profiles (e.g. Selenium/Cypress-first)

Manual-only QA roles

SCADA, hardware, or control-systems testing backgrounds

Right to Work

Applicants must have the legal right to work in the United Kingdom without visa sponsorship now or in the future. Unfortunately, sponsorship is not available for this role

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