Senior Security Engineer

Senior Security Engineer - Fully Remote in the UK We’re looking for a hands-on Senior Security Engineer to strengthen application security, AWS infrastructure and engineering practices. You’ll take ownership of identifying vulnerabilities, implementing fixes and improving security across a platform used by millions. Key Responsibilities - Identify, investigate and remediate vulnerabilities across applications, APIs and dependencies. - Secure AWS infrastructure, including IAM, ECS, Lambda, messaging and secrets management. - Manage and optimise Wiz for security monitoring, alerting and remediation. - Improve threat detection, investigate alerts and support incident response. - Implement security controls using Terraform, CloudFormation and CI/CD pipelines. - Review database security across MongoDB and Snowflake. - Use AI tools to accelerate security testing, investigation and remediation. Essential Skills - Strong JavaScript/TypeScript and Node.js engineering experience. - Proven application security and vulnerability remediation experience. - Hands-on AWS security experience. - Experience with Terraform and/or CloudFormation. - Knowledge of authentication, authorisation, API security and common vulnerabilities. - Experience with threat detection and incident response. - Ability to use AI tools effectively while independently validating results. Desirable - Experience with Wiz. - React and React Native security. - MongoDB, Snowflake and event-driven system security. - Python and security tooling development.