Fullstack Engineer

Quick Facts

• Role: Fullstack Engineer (browser automation and testing framework)

Description

Help evolve a runner engine into an internal framework for browser automation, no-code testing, and agentic testing of web applications.

Build an end-to-end platform for no-code testing where users can record workflows, replay them, validate business processes, and automate complex web applications without writing test code. Expand into agentic testing where AI-driven systems can explore, understand, and test web applications more autonomously. This role focuses on the browser automation engine that powers recording, replay, platform integrations, diagnostics, and future AI-assisted testing capabilities.

What You Will Do

• Expand and evolve the current runner engine into an internal browser automation and testing framework.
• Build reusable TypeScript abstractions over Playwright, Puppeteer, Chrome DevTools Protocol, and browser APIs.
• Improve recording and replay of user actions across complex web applications.
• Develop platform-specific integrations for ERP, CRM, and enterprise systems.
• Support the evolution of the no-code testing platform and agentic web testing capabilities.
• Debug difficult browser automation problems involving timing, dynamic UI updates, frames, custom controls, and SPA behavior.
• Work with Chrome extension architecture where browser-level integration is required.
• Build tooling for diagnostics, traces, logs, screenshots, retries, and failure analysis.
• Use AI tools effectively as part of the engineering workflow to investigate code, debug behavior, and accelerate delivery.
• Write clean, maintainable, strongly typed TypeScript and Node.js code.

What We Are Looking For

• Strong TypeScript and Node.js experience with a solid understanding of the modern JavaScript ecosystem.
• Comfortable building internal frameworks, not just using existing testing tools.
• Understanding of how browser automation works, including Playwright/Puppeteer interactions, browser contexts and frames, page lifecycle/DOM changes, and why real user input behaves differently from scripted interactions.
• Ability to open DevTools, inspect an unfamiliar web application, understand what is happening, and turn that understanding into reliable framework code.
• Relevant experience (highly relevant): Chrome extensions, Chrome DevTools Protocol, browser recording/replay systems, custom automation infrastructure, AI-assisted testing, or autonomous web agents.
• Fluent Polish is a must have.

Bonus Points

• Understanding of Chromium internals (rendering, processes, frames, input dispatch, site isolation, browser debugging).
• Experience with enterprise systems (Microsoft Dynamics 365, Salesforce, SAP, Oracle, ServiceNow, Business Central).