# Application Security Engineer

**Company**: Fin
**Location**: London, England
**Work arrangement**: hybrid
**Experience**: senior
**Job type**: full-time
**Category**: Engineering
**Industry**: Technology

**Apply**: https://job-boards.greenhouse.io/intercom/jobs/8025649?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply
**Canonical**: https://yubhub.co/jobs/job_2123706b-8c7

## Description

Fin is the AI Customer Agent company on a mission to help businesses provide perfect customer experiences.

Our AI Agent Fin is the highest-performing AI Customer Agent on the market today, enabling businesses to deliver impeccable, always-on customer support across the customer journey – from service, to sales, to ecommerce.

The Application Security Engineer will own and engineer tier-zero security capabilities that help customers securely deploy and manage Fin.

## Responsibilities

- Design, build, and evolve customer-facing security features, including authentication, SAML/SSO, permissions systems, audit and activity logging, malicious URL scanning, and other enterprise security controls.

- Partner with engineering teams throughout the software development lifecycle to build secure products and services.

- Perform architecture reviews, threat modelling exercises, and security assessments for new features and systems.

- Build security tooling, automation, and developer-facing building blocks that make secure development easier and more scalable.

- Contribute to secure development standards, guidance, and best practices across Fin.

- Lead application security initiatives across the software development lifecycle, helping teams identify and address security risks early.

- Participate in a shared on-call rotation and lead security incident response, investigation, and remediation efforts.

- Drive security initiatives from problem definition through design, implementation, and measurable outcomes.

- Partner with teams building AI-powered products to assess and mitigate emerging security risks.

- Help shape Fin's AI-first approach to security, including AI-powered detection, red-team automation, continuous monitoring, and emerging defensive capabilities.

- Support the secure adoption of AI-assisted software development tools and engineering workflows.

## Requirements

- Proven application security, product security, or security engineering experience within a SaaS environment.

- Strong software engineering skills with experience designing, building, and operating production systems.

- Deep understanding of modern application security threats, secure software development practices, and threat modelling.

- Experience designing, building, or securing authentication, authorization, identity, or enterprise security capabilities.

- Experience conducting architecture reviews and security assessments for complex systems.

- Hands-on security incident response experience, including leading investigations and remediation efforts.

- Strong programming skills and experience building tools, automation, or developer-focused solutions.

- Comfortable using modern AI-assisted development tools to improve productivity and engineering effectiveness.

- Ability to communicate security concepts clearly and collaborate effectively with engineering teams.

- A pragmatic approach to balancing security, customer impact, and engineering velocity.

## Nice to Have

- Experience building or owning authentication, SAML/SSO, identity, or access management capabilities.

- Experience securing AI-powered products or familiarity with security considerations for large language models, agentic systems, retrieval-based architectures, or AI tool integrations.

- Experience building security automation or security-focused platform capabilities at scale.

- Familiarity with cloud security, infrastructure security, or distributed systems.

- Experience working across both large-scale SaaS environments and high-growth companies.

## Benefits

- Competitive salary and equity in a fast-growing start-up

- We serve lunch every weekday, plus a variety of snack foods and a fully stocked kitchen

- Regular compensation reviews - we reward great work!

- Unlimited access to Claude Code and best-in-class AI tools; experimentation & building is encouraged & celebrated.

- Pension scheme & match up to 4%

- Peace of mind with life assurance, as well as comprehensive health and dental insurance for you and your dependents

- Flexible paid time off policy

- Paid maternity leave, as well as 6 weeks paternity leave for fathers, to let you spend valuable time with your loved ones

- If you're cycling, we've got you covered on the Cycle-to-Work Scheme. With secure bike storage too

- MacBooks are our standard, but we also offer Windows for certain roles when needed.

## Skills

### Required
- application security
- product security
- security engineering
- software engineering
- threat modelling
- security assessments
- incident response
- programming
- AI-assisted development tools

### Nice to have
- authentication
- SAML/SSO
- identity
- access management
- cloud security
- infrastructure security
- distributed systems
- securing AI-powered products

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Source: [Apply at job-boards.greenhouse.io](https://job-boards.greenhouse.io/intercom/jobs/8025649?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)