Senior Software Engineer - Javascript/Typescript

Fingerprint empowers developers to stop online fraud at the source. We work on turning radical new ideas in the fraud detection space into reality. Our products are developer-focused and our clients range from solo developers to publicly traded companies. We are a globally dispersed, 100% remote company with a strong open-source focus. Our flagship open-source project is FingerprintJS (20K stars on GitHub). We have raised $77M and are backed by Craft Ventures (previously invested in Tesla, Facebook, Airbnb ), Nexus Venture Partners (previously invested in Postman , Apollo.io, MinIO , Druva) and Uncorrelated Ventures (previously invested in Redis, Rollbar & Gradle ). We have noticed a rise in recruiting impersonations across the industry, where scammers attempt to access candidates' personal and financial information through fake interviews and offers. All Fingerprint recruiting email communications will always come from the @fingerprint.com domain. Any outreach claiming to be from Fingerprint via other sources should be ignored. Senior Software Engineer - JavaScript / TypeScript **Know what really happens under the hood of a browser?** Can you walk through the JavaScript event loop in your sleep? Do you understand the browser rendering pipeline better than most devs understand their own code? Have you ever built your own JavaScript framework just for fun? Love open source? Then you might be exactly who we’re looking for. This isn’t your run-of-the-mill TypeScript/JavaScript role. We’re not building landing pages or dashboards here. This is backend-level engineering that happens to run in the most hostile, performance-constrained environment there is: the browser. We’re hiring a **JavaScript/TypeScript Engineer** to own our browser-side JavaScript agent, CDN integrations, and performance-critical SDKs used by millions every day. You’ll be crafting tamper-resistant, lightning-fast code that survives in the wild—pushed to its limits by scale, security threats, and the quirks of every browser under the sun. If you want to push the boundaries of what’s possible in the browser, apply today! But first, check out our [**open-source projects**] ( ) to see if you can picture yourself here. What you’ll do: Build and maintain our browser-side TypeScript/JavaScript agent used for device identification, bot detection, and risk assessment Engineer for stealth, resilience, and performance—minimizing footprint, resisting detection, and maintaining compatibility across browsers Optimize for both code size and execution speed in complex, adversarial environments Stay ahead of browser changes, plugin behaviors, and fingerprinting techniques Collaborate with backend, security, and data science teams to align signal capture with detection logic Write comprehensive tests and contribute to CI pipelines that ensure functionality across a wide range of platforms and devices Contribute to a widely-used open-source project with 24K+ GitHub stars and 25B+ monthly usages What You Bring: **3-5 years of JavaScript and TypeScript experience**, especially in browser environments Deep understanding of **browser APIs, DOM behavior, timing attacks, and anti-debugging techniques** Experience building **libraries or SDKs**, especially for production or developer-facing use cases Strong frontend experience (~80%), with backend familiarity (~20%) Proficiency with build tools like **Vite**, **Webpack, Rollup, Esbuild**, including code obfuscation and minification Experience with modern testing frameworks such as **Vitest**, **Jasmine, Jest**, or similar Familiarity with **security principles, privacy best practices, and adversarial engineering** Comfortable working in fast-paced environments without rigid specifications Strong sense of ownership and autonomy; you enjoy working independently and solving hard technical problems Clear written and verbal communication skills in English Nice to Have: Experience in complex domains like **media, gamedev, or security**, or on technically demanding browser projects (e.g. Google Docs, Figma, Miro, or 3D browser games) Contributions to open-source projects, especially in the JavaScript/TypeScript ecosystem Experience with **WebAssembly, browser extensions, or remote debugging** Familiarity with AWS services such as **Lambda, CloudFront, and DynamoDB** Browser automation or scraping experience Compensation Range For US-based employees , the cash compensation range for this role is $150,000 – $200,000 . We set standard ranges for all US roles based on function, level, and geographic location, benchmarked against similar stage growth companies. To comply with local legislation and provide greater transparency, we share salary ranges on all job postings. However, these ranges are specific to the hiring location and may differ within or outside the US. We have noticed a rise in recruiting impersonations across the industry, where scammers attempt to access candidates' personal and financial information through fake interviews and offers. All Fingerprint recruiting email communications will always come from the @fingerprint.com domain. Any outreach claiming to be from Fingerprint via other sources should be ignored. Offers vary depending on, but not limited to, relevant experience, education, certifications/licenses, skills, training, and market conditions. Due to regulatory and security reasons, there’s a small number of countries where we cannot have Fingerprint teammates based. Additionally, because Fingerprint is an all-remote company and people can join our workforce from almost any country, we do not sponsor visas. Fingerprint teammates need to be authorized to work from their home location . We are dedicated to creating an inclusive work environment for everyone. We embrace and celebrate the unique experiences, perspectives and cultural backgrounds that each employee brings to our workplace. Fingerprint strives to foster an environment where our employees feel respected, valued and empowered, and our team members are at the forefront in helping us promote and sustain an inclusive workplace. We highly encourage people from underrepresented groups in tech to apply. If you are applying as a resident of California, please read our CCPA notice here If you are applying as a resident of the EU, please read our GDPR notice here