Software Engineer, Simulation

About the role

We’re looking for an experienced fullstack engineer to help build out our new Simulation product. Simulation is a small, fast-moving team inside Doppel (a Series C company backed by Bessemer and a16z) building an entirely new product line—think of it as a startup within a startup. We crossed six figures within a few months of launching and are on track to hit 1M ARR in Q4.

Our mission: to help companies proactively defend against the next wave of social-engineering attacks. We’re creating AI-powered phishing simulations that use large-language models and voice synthesis to mimic real-world threats—from hyper-personalized emails to high-fidelity “manager calls” that test and train enterprise security teams. You’ll be joining a team led by ex-Meta and YC founders, already working with Fortune 100 customers. It’s the rare mix of startup-level growth and creativity with established-company backing and stability.

Responsibilities

• Build out a “Cursor for phishing simulation” flow that lets users create simulations using natural language
• Build out voice deepfakes that use AI to call employees pretending to be their co-worker

About Doppel

Doppel is building the future of social engineering defense. Our AI-native platform uses agentic AI to protect executives, employees, customers, and brands from phishing, impersonation, fraud, and other AI-powered threats across digital channels. We help some of the world’s most recognized brands detect and dismantle attacker infrastructure while strengthening employee resilience through threat-informed training and simulation.

By unifying Digital Risk Protection, Human Risk Management, and Email Security, Doppel connects threats into a real-time intelligence graph to power faster disruption, smarter defense, and modern security awareness at scale. We scan over 150 billion entities daily and deploy continuously adaptive AI SOC agents, paired with expert human analysts, to uncover and disrupt the infrastructure behind phishing, impersonation, and online fraud before attacks can spread. Our Threat Grid turns every customer signal into shared intelligence, making each disruption smarter, faster, and more effective.

Backed by leading investors including Andreessen Horowitz and Bessemer Venture Partners, and trusted by leading enterprises, Doppel is a rapidly growing Series C startup combining deep cybersecurity expertise, operational rigor, and startup velocity to solve some of the internet’s most urgent trust and safety challenges.

Benefits

• A mission-driven culture with low ego, high ownership, deep customer obsession, and exceptional talent density
• Free lunch and dinner in the office
• Flexible PTO
• Quarterly team offsites