On The Spot DevelopmentOD

Senior Browser Automation Engineer

On The Spot Development is a boutique software development company that helps fast-growing startups and tech companies build and scale their products by offering offshore R&D teams, custom software development, and CTO as a Service.

On The Spot Development

Employee count: 51-200

Poland only
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.
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.

What You'll Do

  • 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

Must-Have Skills

  • 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

Bonus

  • 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 supportin Poland
  • Ability to work from our comfortable office in Warsaw at Prosta 51
  • 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, gifts to employees on significant dates

About the job

Apply before

Posted on

Job type

Full Time

Experience level

Senior

Location requirements

Hiring timezones

Poland +/- 0 hours

About On The Spot Development

Learn more about On The Spot Development and their company culture.

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We bring disruptive startups, unicorns and other cool tech companies to the local market, offering engineers the opportunity to work on high-impact products.

At On The Spot, you join our customers’ R&D teams while we take care of employment, HR support, benefits, and an enjoyable work environment.

Since 2016, we've been working with big names like Cycode, Orca Security, Unity, Tripledot, and others, helping them launch over 30 teams.

Being founded by engineers, we wanted to stay connected to the engineering community while, you know, running a business. So, we found our ways to stay in the heart of engineering thought.

  • TechSpot events to connect in person with top minds in tech.

  • 137 Podcast where we discuss current software development challenges and trends.

  • Team Lead Club – our internal community for engineering leadership.

Plus, our R&D teams get to participate in hackathons and workshops, keeping things interesting. And of course, we're not immune to the classic office traditions – corporate parties, pizza Fridays, kicker championships.

Want to jump on board? Check out open positions!

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On The Spot Development

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On The Spot Development hiring Senior Browser Automation Engineer • Remote (Work from Home) | Himalayas