Fin
Application Security Engineer
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Fin: AI Customer Agent Company
About Fin
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, enabling businesses to deliver impeccable, always-on customer support across the customer journey—from service to sales to ecommerce. Powered by our own AI models, Fin resolves complex customer issues end-to-end across every channel with minimal setup and integration.
Fin can also be combined with our natively integrated Intercom help desk, offering a single system designed to meet the needs of modern support teams.
Founded in 2011, Fin became one of the fastest-growing companies and remains one of the largest private software firms globally, with nearly 30,000 global businesses using our products to transform customer support. Driven by our core values, we push boundaries, build with speed and intensity, and relentlessly deliver incredible value to our customers.
The Opportunity
Fin is transforming customer service through AI to deliver fast, accurate, and reliable support at scale. Trust is foundational to this mission.
Security Engineering Team
Fin’s Security Engineering team is unlike most security teams—we own and operate critical security services, build customer-facing security features, and partner with engineering teams to make secure development the standard.
We are engineers first, designing, building, and operating the systems needed to protect Fin and its customers. The team takes ownership of tier-zero services, including:
- Authentication
- SAML/SSO
- Teammate activity logs
- Malicious URL scanning
- Enterprise security controls
Key Responsibilities
As part of this team, you’ll:
- Own and engineer tier-zero security capabilities that help customers securely deploy and manage Fin.
- Design, build, and evolve customer-facing security features, including:
- Authentication
- SAML/SSO
- Permissions systems
- Audit and activity logging
- Malicious URL scanning
- Enterprise security controls
- Partner with engineering teams across secure software development lifecycles to build secure products and services.
- Perform architecture reviews, threat modeling exercises, and security assessments for new features and systems.
- Build security tooling, automation, and developer-facing building blocks that make secure development easier and scalability sharper.
- Contribute to secure development standards, best practices, and guiding principles across Fin.
- Lead application security initiatives, identifying and addressing security risks early in the software development lifecycle.
- Participate in shared on-call rotations, leading security incident response, investigations, and remediation efforts.
- Drive security initiatives from problem definition through design, implementation, and measurable outcomes.
- Partner with AI-powered product teams 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
- Emerging defensive capabilities
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- Support the secure adoption of AI-assisted software development tools and engineering workflows.
Required Skills
- Proven application security/ product security, or security engineering experience in a SaaS environment.
- Strong software engineering skills, including experience in designing, building, and operating production systems.
- Deep understanding of modern application security threats, practices of secure development, and threat modeling.
- Familiarity with authentication, authorization, identity, and enterprise security capabilities.
- Experience conducting architecture reviews and security assessments of complex systems.
- Hands-on experience in security incident response, including leading investigations and remediation.
- Strong programming skills with expertise in building security tooling, automation, or developer-focused solutions.
- Comfortable using modern AI-assisted development tools while enhancing productivity and team effectiveness.
- Ability to clearly communicate security concepts and collaborate effectively with engineering teams.
- Pragmatic approach to balancing security, customer impact, and engineering velocity.
Bonus Skills & Attributes
- Experience building and owning authentication, SAML/SSO, or identity/access management services.
- Familiarity with securing AI-powered products or knowledge of:
- Security considerations for large language models
- Agentic systems
- Retrieval-based architectures
- AI tool integrations
- Experience in building security automation or security-focused platform tools at scale.
- Knowledge of cloud security, infrastructure security, or distributed systems.
- Experience working across large-scale SaaS environments and high-growth companies.
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Benefits
We focus on treating our team well, offering a healthy work-life balance, and providing a variety of top-tier benefits. Need something specific not listed here? Just ask!
- Competitive salary and equity in a fast-growing startup
- On-site lunches and snacks daily, plus a fully stocked kitchen
- Regular compensation reviews—great work is recognized and rewarded
- Unlimited access to Claude Code and best-in-class AI tools for experimentation
- Pension contributions, with potential matching (up to 4%)
- Comprehensive employee protections: life assurance, health, and dental insurance for employees and dependents
- Flexible paid time off policy
- Paid maternity leave, plus 6 weeks paternity leave, ensuring parents can bond with their loved ones
- Cycle-to-work scheme support, with secure bike storage available
- MacBooks are standard, with flexibility for Windows if required
- #LI-Hybrid
Policies
- Hybrid Working Policy: Fin operates under a hybrid working model, designed for flexibility. Teams should expect employees to be present in the office at least three days per week to enhance collaboration and facilitate a healthy in-person culture.
- Radically Inclusive Culture: We foster an open and accepting environment, avoiding divisive topics to create a safe and cohesive space for everyone. Individual opinions on social or political topics remain personal and are respected outside of work or official communications. We prioritize teamwork and collaboration by staying focused on achieving impressive goals together.
- Equal Employment Opportunity: Fin values diversity and maintains a firm policy against any form of discrimination. This includes considerations for race, color, religion, creed, national origin, ancestry, sex, gender, age, physical or mental disability, veteran or military status, genetic information, sexual orientation, gender identity, gender expression, marital status, or any other legally protected basis. Every applicant and employee is treated equally.
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