Senior Browser Automation Engineer

Company
On The Spot Development
Team
Notte
Department
Engineering & DevOps
Poland
Remote
B2B
Engineering & DevOps
Notte
Remote
Poland
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About On The Spot

We collaborate with startups globally to build their local engineering teams. You'll be employed by On The Spot but fully embedded in our partner’s team, working alongside their in-house engineers.

About the team

Notte is the fastest, most reliable framework for Browser Using Agents. We provide an open-core browser infrastructure with a perception layer turning webpages into an action API in text, making it simple for LLMs to read, understand, and act on sites.

Our tech wins on speed, cost, and task success, letting you build smaller, faster, and smarter agents — ready for production.

About the role

We're building the foundational infrastructure for agentic systems that interact with the real web.

Your job: engineer high-fidelity, high-resilience browser automations that operate seamlessly under real-world constraints, security layers, and dynamic UIs.

This is a role for a white-hat hacker who deeply understands how browsers work, how the web defends itself, and how to build automations that behave indistinguishably from humans, all within authorized, compliant frameworks.

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Responsibilities

  • Architect and implement real-world browser automation pipelines using Playwright (preferred) or Puppeteer, with custom extensions where needed
  • Engineer interactions across dynamic, JS-heavy frontends (e.g. React/Next.js, Vue, Angular) for authorized agentic workflows
  • Build systems that understand and respect client-side integrity checks (JS challenges, CSPs, headless detection, fingerprinting) while operating within permitted boundaries
  • Analyze and emulate authentic user behaviors (input timing, mouse movement, scroll patterns) for legitimate automation use cases
  • Manage complex authorized sessions: handle auth flows, tokens, cookies, WebStorage for permitted access patterns
  • Operate at the network and TLS layer: configure proxies, manage headers, optimize connection handling for compliant high-volume operations
  • Build systems for monitoring and debugging automation stability across changing frontends
  • Reverse engineer complex UIs to build robust extraction layers that adapt to DOM mutations and A/B tests

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Requirements

  • Python expert: asyncio, aiohttp, Playwright Python API, multiprocessing/threading, typing, Pytest
  • Advanced JavaScript: DOM APIs, event simulation, JS execution in automation contexts, modern framework internals
  • Strong grasp of browser internals: DevTools Protocol, rendering pipeline, user-agent behavior, navigator APIs
  • Comfort with network-level tooling: proxy management, HAR analysis, Chrome NetLog, performance debugging
  • Experience with web security mechanisms: understanding bot detection systems, CAPTCHA flows, modern web defenses
  • Familiarity with system observability: logging, performance tracing, debugging automation at scale
  • DevOps experience: Docker, CI pipelines, metrics, and autoscaling infrastructure

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Nice to have

  • Contributions to browser automation or testing frameworks
  • Experience with custom browser configurations and headless optimization
  • Security research background in web technologies and browser behavior
  • Experience building compliant, high-scale automation systems

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Benefits

  • Work in a highly professional team. Informal and friendly atmosphere in the team
  • Paid vacation — 20 business days per year, 100% sick leave payment
  • Equipment provision
  • Partially compensated educational costs (for courses, certifications, professional events, etc.)
  • Legal and Accounting support in Poland
  • Ability to work from our comfortable downtown office in Warsaw
  • 5 sick days per year
  • Medical insurance (after the end of the probationary period)
  • English and Polish classes 2 times a week (online)
  • Bright and memorable corporate life: corporate parties 2 times a year, gifts to employees in honor of life events

Join us

To be considered for this position, you must have Polish citizenship, a D-type work visa, or a residence permit. Thank you!

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Thanks for applying!

Your application has been successfully submitted. One of our recruiters will be in touch soon.

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Dzmitry Siniukovich

Recruiter

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Know someone perfect for this role? Let us know about them. We have a referral program to recognize your support.

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Thank you!

Your message has been sent successfully! We will contact you as soon as possible.

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Dzmitry Siniukovich

Recruiter

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