# Senior IS Tester at Sainsbury's

Sainsbury's is hiring a Senior IS Tester in London, United Kingdom. Level rates it Little AI ●○○○; you can [apply on Sainsbury's](https://jobsbylevel.com/go/ce368450-a245-4534-bfea-d25b93abf24b?utm_medium=ai-agent).

AI Level 1, AI centrality 37 out of 100. London, United Kingdom.

## Details

- Company: [Sainsbury's](https://jobsbylevel.com/companies/sainsbury-s)
- AI level: AI Level 1 (score 37 out of 100)
- Location: London, United Kingdom
- Posted: October 23, 2026
- Apply: https://jobsbylevel.com/go/ce368450-a245-4534-bfea-d25b93abf24b?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=senior-is-tester-at-sainsbury-s-8000fd

## Description

The big question: why on earth should a Tech professional like you work for a 150-year-old retail chain? Because we’re on a journey. Changing the way we operate. Learning to think nimble. Giving our teams the time and freedom they need to push boundaries. To create amazing systems and technologies. To give our colleagues and our customers even more incredible experiences. There are thousands of experts to talk to and learn from. We’ve got data from billions of transactions for our teams to play with. Things get built here. They get made here. They hit customers and colleagues quickly. Welcome to the home of Sainsbury's Tech. About the Team Our Data Governance & Information Security team is at the heart of protecting the organisation’s systems, data, and people. We work across all areas of the business to identify risks, strengthen defences, and ensure compliance with industry standards and regulations. We value accountability, curiosity, and continuous improvement, and we’re passionate about building a culture where security is second nature. Joining us means being part of a team that tackles evolving threats, drives awareness, and helps the organisation remain resilient and trusted. More about the role: The Senior Information Security Tester will be engaged in delivering Penetration Testing & related services and will: Scope penetration testing for both internal and external facing systems Take ownership and perform a wide range of penetration tests in line with internal standards and SLAs, including detailed and actionable reporting through our reporting platform Provide expert feedback in several forums related to technical vulnerabilities and processes within and outside of the security testing team Performing Quality Assurance on in-house reports, vulnerability database write-ups, and any related documentation related to the security testing team’s function Improve internal vulnerability database write-ups to increase overall quality of all reports Be able to assist other teams in understanding security vulnerabilities and implications through constructive conversations & meetings when engaged through security testing, or as part of the wider conversation Periodically review external penetration tests as part of ongoing vendor evaluation, along with providing formal feedback for any issues and participating in resolution meetings Provide mentorship to others within the team, along with assisting to fill in any knowledge gaps when identified Be able to perform Purple Team activities as required, with Red Team capabilities a large advantage Participate in reviewing bug bounty findings and providing feedback for issues which are of high severity, complexity, and exceeding a reward threshold Have the opportunity to provide advice and guidance associated with the planning, design, implementation and improvement of system security taking account of current best practice, legislation and regulation when necessary Help shape the security testing process by providing feedback highlighting opportunities for improvement in efficiency and ways of working Essential: Extensive experience performing Web Application penetration tests Extensive knowledge of OWASP vulnerabilities, tools and methodologies Strong Experience performing Infrastructure penetration tests against Windows & Linux environments Strong Experience performing build reviews against Windows & Linux hosts, MacOS a bonus Strong technical writing ability to write penetration test reports for technical and non-technical audiences Strong reporting Quality Assurance skills Ability to work on their own with minimal supervision and deliver on time to budget Demonstrates extensive knowledge of good security practice covering the physical and logical aspects of information products, systems integrity and confidentiality At least one of the following information security testing certifications OSWE, OSCP, GIAC or CREST (CRT or CCT) Ability to think methodically and logically

The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/senior-is-tester-at-sainsbury-s-8000fd

Source: https://jobsbylevel.com/jobs/senior-is-tester-at-sainsbury-s-8000fd

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