Senior Web Security Researcher

As a Senior Web Security Researcher at Nimble, you will spearhead our efforts in the research domain, driving our cutting-edge data gathering solutions. You will work on complex technical challenges at the intersection of browser internals, reverse engineering, and large-scale data gathering. You will analyze and break down advanced client-side protection mechanisms, dive into large and complex codebases such as Chromium, and develop high-performance, cross-platform capabilities that power our products.

This role is both hands-on and research-driven: you’ll be expected to investigate hard problems, turn insights into solutions, and help push the boundaries of what’s possible in web data gathering.

Responsibilities:

• Reverse-engineer and analyze advanced bot-detection systems, including JavaScript based mechanisms and API interaction flows.
• Analyze and modify large-scale browser codebases that empower our products.
• Apply a deep understanding of browser internals and architecture to improve stability, performance, and resistance to anti-automation measures.
• Collaborate with researchers and developers to integrate findings into production solutions.
• Provide technical guidance and mentorship within the research team.

About us:

Nimble is the real-time web search platform built for enterprise accuracy, completeness, and trust. We run Web Search Agents that actively navigate live websites using real browsers and reasoning, turning the public web into governed, decision-grade data for AI systems and high-stakes business use.

Unlike index-based “AI search” tools or brittle legacy scraping, Nimble makes the live web queryable on demand, delivering structured outputs that teams can verify and rely on. Our platform powers use cases where correctness matters: financial due diligence, real-time pricing and promotions, market intelligence, and AI systems that depend on fresh, complete data.

Trusted by leading enterprises like Home Depot, Uber, and Coca-Cola and backed by top-tier investors, Nimble sits at the intersection of AI, automation, and real-time web intelligence.

As demand accelerates across AI, LLMs, and data-driven decisioning, we’re scaling quickly and looking for high-energy, driven teammates who thrive in fast-moving environments and want to help define a new category.

Why join Nimble?

• Work on a deeply technical platform powering real-time AI and enterprise decisions
• Help define the future of Web Search Agents and live web intelligence
• Build alongside a sharp, mission-driven team that moves fast, ships often, and takes ownership

• At least 5 years of experience working within research teams, with a focus on at least one of the following: web data extraction, reverse engineering, or browser technologies.
• Strong analytical and problem-solving skills, with keen attention to detail and a passion for pushing the boundaries of what’s possible in web data gathering.
• Strong JavaScript skills with hands-on reverse-engineering experience in web contexts.

Advantages

• Hands-on experience with dynamic instrumentation and reverse engineering tools such as Frida, IDA Pro, Ghidra, or Radare2 / Cutter.
• Experience with browser automation frameworks (Puppeteer, Playwright, CDP) and/or anti-scraping / bot-detection mechanisms.
• Familiarity with web-focused IDEs and debugging environments (e.g., Chrome DevTools Protocol, Charles Proxy, Fiddler, Burp Suite, VS Code, WebStorm).
• Prior work with Chromium or Firefox source code.