TypeScript Engineer, Fingerprint
JS Agent
$130-180k
More information about location
Device intelligence platform for fraud detection
Be an early applicant
Device intelligence platform for fraud detection
201-500 employees
Be an early applicant
$130-180k
More information about location
201-500 employees
Company mission
To power a safe and seamless internet through device intelligence.
Role
Who you are
- 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
Desirable
- 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
What the job involves
- 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
- 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
Our take
Digital fingerprinting is an essential process in web browsers that tracks the digital address of a device to monitor web activity. This technique facilitates the identification of fraud and spam, as well as warning signs of account takeovers. However, the success of this requires users to accept cookies, a requirement that is easy to avoid.
Fingerprint provides a digital fingerprinting tool that generates a unique identifier of browser activity without requiring the user to accept cookies. The service uses the same WebGL and canvas fingerprinting utilized by existing competitors, but instead of focusing on devices, it identifies web activity. Suspicious activity will result in the identified user being logged in a database, allowing the service to be improved for others.
With this innovative approach, Fingerprint has been able to build up an impressive client roster of over 6,000 companies, including 16% of the top 500 websites by traffic. As well as displaying sustained growth through funding rounds, the company has also continued to improve upon its offering.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
36% employee growth in 12 months
Company
Funding (last 2 of 4 rounds)
Oct 2023
$33m
SERIES C
Nov 2021
$32m
SERIES B
Total funding: $77m
Company benefits
- Competitive salary: We offer competitive salaries and equity because we believe all employees should own a part of Fingerprint.
- Flexible Time Off: To prioritize work-life balance, we even have a minimum vacation days target to encourage everyone gets the rest they need.
- Remote-first: We work asynchronously and respect time-zone differences. Choose where and when you do your work best.
- Tech: We hook you up with a MacBook so you can do your best work (you get to keep it after 4 years).
- Culture: We're a small team with a lean hierarchy where you can make a real impact in shaping the company culture. Come grow with us!
- Fun: We meet up as a company once a year (We went to Mexico City in 2023!) and teams meet up in smaller groups throughout the year.
- Grow With Us: We want you to grow with us, so we offer a $600 yearly budget that you can spend to learn new stuff.
- Personal Development: We give you the freedom to grow and experiment. Work on open-source projects and try new things and ideas.
Company HQ
Little Italy, Chicago, IL
Leadership
Valentin Vasilyev
(Co-FOunder & CTO)Valentin worked as a Software Engineer for the first 9 years of their career, before holding Team Lead roles at Evrone and Machinio.com. They left this role in March 2019 to co-found Fingerprint the following month.
Dan Pinto
(Co-Founder & CEO)Previously co-founded Machino, where they were CTO, and has experience in Software Engineering.
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