Senior Golang Developer - Web/Vulnerability Scraping 3-Month Rolling Contract (up to 2 years) £600-£650 per day - Inside IR35 Hybrid - London 3 days per week & 2 days working from home Our global media and consumer technology client is seeking a Senior Back End Engineer to join their Information Security team for an initial 3-month contract. This role focuses on building and maintaining internal tools used for large-scale web application testing, automation, and scraping, helping to improve the security and resilience of digital platforms used worldwide. This is a fast-paced, high-impact role suited to experienced engineers who are confident working autonomously and contributing to complex systems with minimal onboarding. The ideal candidate will be available immediately or at short notice, and willing to work flexibly as needed to help clear a growing backlog of work. Key Responsibilities Creating tools that emulate malicious activity in order to detect and fix weaknesses in web platforms. Build and enhance microservice-based automation pipelines that test and strengthen web apps. Design, develop, and maintain scalable back end systems for internal web crawling and scraping tools. Collaborate with engineering and security stakeholders across global teams. Deliver high-quality, efficient code in an agile environment with minimal supervision. Requirements Extensive commercial experience with Golang in back end development. Familiarity with Python is advantageous but not essential. Proven ability to build and support applications at scale, ideally in microservices environments. Strong understanding of web technologies and experience with web scraping or automation. Knowledge of information security principles and secure coding practices. Excellent communication and documentation skills. Comfortable working independently and able to hit the ground running. Experience working in global, distributed teams.