Senior Product Security Engineer

ClassPass · United States

  • Senior
  • Full-time
  • $150,000 – $175,000
  • Posted 2026-09-08
  • Confirmed live on 25 September 2026

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Job description

At Playlist, life's richest moments happen when people step away from screens to move, connect, explore, and play. We're building the definitive platform for intentional living, connecting people with inspiring experiences in fitness, wellness, and beyond. With popular brands like Mindbody and ClassPass, Playlist empowers businesses and individuals, making it effortless for aspirations to become actions. Join us in reshaping technology's role to foster meaningful, real-world connections.

ClassPass offers thousands of fitness and wellness experiences worldwide, helping people lead active, balanced lifestyles. Our platform makes discovering and enjoying activities simple, personalized, and joyful—whether it's fitness classes, self-care sessions, a healthy lunch, or a new adventure. Join us in shaping healthier, more vibrant communities around the globe.

Who We Are

We are a dedicated team of product security engineers committed to developing and supporting ground-breaking software products. Together we will work to safeguard the future, enabling wellness businesses worldwide to empower their customers to lead healthy lives. Driven by a higher purpose, we continuously challenge ourselves and our organization to excel, recognizing the strength that comes from collaborative efforts toward a common objective. We are strong advocates for a diverse workplace, fostering an environment where individuals can bring their authentic selves to contribute to our shared success. At the core of our achievements is a deep belief in the value of our people. If you share our passion and vision, we invite you to consider joining our team. Together, we can explore remarkable feats and make a lasting impact!

Your Role

As a Senior Security Engineer, you will drive the security architecture and support the offensive testing practice of the Product Security team. You'll partner with engineering to design secure-by-default systems, review architectures and designs for exploitable weaknesses, and personally test our products the way an attacker would. You will lead threat modeling for new features and platforms, define secure design patterns and reference architectures, and conduct hands-on penetration testing across web applications, APIs, and cloud .

You'll ensure security is designed in from the start rather than bolted on afterward — reviewing designs before code is written, validating that architectural controls hold up under adversarial testing, and translating findings into concrete remediation guidance engineering teams can act on. You'll pursue continuous improvement to help Playlist achieve its mission: powering the world's fitness and wellness businesses and connecting them with more consumers, more effectively, than anyone else.

The Role You'll Play

• Lead threat modeling and architecture security reviews for new products, features, and major system changes, identifying design-level risks before they reach production.

• Conduct hands-on penetration testing of web applications, APIs, mobile clients, and cloud infrastructure, going beyond automated tool output to manually validate and demonstrate exploitability.

• Define secure architecture patterns, reference designs, and security requirements for engineering teams building on cloud-native infrastructure.

• Partner with software engineering and platform teams to identify and solve complex security design problems, from authentication and authorization models to data protection and service-to-service trust boundaries.

• Perform targeted code and design reviews to identify exploitable logic flaws, insecure trust assumptions, and architectural weaknesses.

• Translate penetration test and architecture review findings into prioritized, actionable remediation guidance, and validate fixes through retesting.

• Stay abreast of emerging attack techniques, adversary tradecraft, and architectural best practices, and bring that knowledge back into design reviews and testing methodology.

• Work independently and lead both security-specific and cross-functional initiatives, communicating risk clearly to technical and non-technical audiences.

The Experience You’ll Bring

You are an intellectually curious senior security engineer who thinks like an attacker and designs like an architect. You bring deep expertise in application security architecture and offensive testing methodology, and you can move between designing a secure system and trying to break one. You communicate findings and design recommendations clearly to both engineers and leadership. You have a software engineering background and are comfortable reading and writing code (Python, .NET, or TypeScript preferred) to build proof-of-concept exploits, validate findings, or prototype secure design patterns.

You will thrive in this role with experience

• 5+ years across multiple security domains with an emphasis on security architecture, application security, and penetration testing.

• Verifiable, hands-on penetrati

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