Senior Backend Engineer - Fraud Detection Squad

Senior Backend Engineer - Fraud Detection Squad | Lemonade Careers Open Menu Renters Homeowners Car Pet Life Giveback Close Menu Renters Homeowners Car Pet Life Giveback All Positions > Tech Development > Senior Backend Engineer - Fraud Detection Squad Senior Backend Engineer - Fraud Detection Squad Tel Aviv, Israel | Tech Development Not your everyday company Lemonade completely reinvented how insurance works. As a customer-centric tech company, we created an insurance experience that is smart, instant, and delightful. At Lemonade, you’ll be working with a group of like-minded makers, who get a kick out of moving fast and delivering great products. We surround ourselves with some of the smartest, most motivated, creative people who are filled with positive energy and good karma. Unlike most publicly traded companies, we’re nimble and efficient. We take pride in the fact that we still think and operate like a startup. We don’t care much about titles and hierarchy and instead focus on innovation, bold moves, and challenging the status quo. We’re built as a lean, data-driven organization that relies on a common understating of objectives and goals to provide teams with autonomy and ownership. We don’t like spending our days in meetings and we skip committees altogether. At Lemonade, there’s no such thing as going over someone’s head. We have zero tolerance for bureaucracy, office politics, and lean-back personalities. As a Public Benefit Corporation and a certified B-Corp, we deliver environmental and social impact using our products and tech. Through our Giveback program, we partner with organizations such as the ACLU, New Story, The Humane Society, Malala Fund, American Red Cross, 360.org, charity: water, and dozens of others, and have donated millions towards reforestation, education, animal rights, LGBTQ+ causes, access to water, and more. Awarded ‘best workplace’ Best Workplace and Best-Led Company by Inc. Magazine “World Changing” by Fast Company Recognized as a World Changing Idea by Fast Company Magazine Ranked #1 Home insurance in America Won best renters and homeowners insurance in America by US News, and others Best Pet Insurance in America Rated “Best Overall Pet Insurance” by Better Homes & Gardens Rated 4.9 ⭐ on the App Store Among the highest rated apps of all time What you’re applying for Join our cross-functional fraud detection squad where you'll build systems that protect millions of customers while keeping the good ones flowing seamlessly through our platform. We believe three things matter for every role at Lemonade: drive to push through challenges, efficiency that keeps standards high while moving fast, and adaptability that lets you pivot with data and AI insights. These aren't buzzwords, they're how we actually work. Our AI-first approach isn't just a tagline either. We're building the future of insurance with AI at the center, and we need people who are genuinely excited to learn and grow alongside these tools. In this role you'll: Build fraud detection systems using microservices in Typescript (NestJS) and Ruby on Rails, running over Kubernetes to catch bad actors while keeping legitimate customers happy Leverage our autonomous tools to manage development flow—from environment setup to production deployment—so you spend time solving fraud, not fighting infrastructure Collaborate with data scientists, product managers, and fraud analysts in a self-sufficient squad to hit aggressive fraud prevention OKRs Own your domain's code quality, performance, and scalability as fraudsters get smarter and transaction volumes explode Design systems that make split-second decisions on claims and applications, balancing security with customer experience Coach and mentor other engineers while staying ahead of evolving fraud patterns and attack vectors Partner with our AI/ML teams to implement and optimize machine learning models that detect fraud in real-time What you'll need: 6+ years as a backend engineer, ideally with experience in fraud detection, risk management, or high-stakes decision systems BSc in Computer Science, Mathematics, or equivalent experience Passionate about technology and the cat-and-mouse game of fraud prevention Broad knowledge of modern backend frameworks, tools, and architecture—especially real-time processing and decision engines Experience with high-scale, production-grade projects where uptime and accuracy are non-negotiable Past contributions to open source projects (