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Senior Browser Automation Engineer
About On The Spot
On The Spot Development is a software development company that builds R&D teams for heavily invested startups and tech companies from the UK, EU, and Israel.
This job opportunity is for a position within one of our teams. You will be directly employed by On The Spot and will collaborate closely with our partner companies, contributing to their product's journey.
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
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
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
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!
Contribute to our growth
Know someone perfect for this role? Let us know about them. We have a referral program to recognize your support.
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