Python Dev for Browser Automation & Proxy Integration

Job Title: Python Developer – Multi‑Session Browser Automation & Residential Proxy Integration (QA/Testing)

Project Overview

We are developing an internal testing framework for our company’s own web applications. Our tool launches multiple simulated user sessions (multi‑ID / multi‑profile) simultaneously to:

· Validate region‑specific content, language localisation, and geo‑targeted features.
· Test session isolation and concurrency handling under realistic network conditions.
· Perform load and reliability checks by distributing traffic across diverse IP origins.

Our current Python/Playwright stack already handles single‑session browser launches with realistic user‑simulation (typing delays, idle times). We now need an experienced developer to:

1. Enable true multi‑session concurrency – managing 10+ browser profiles running in parallel without conflicts.
2. Integrate residential proxy rotation – so each concurrent session gets a unique residential IP (from a provider we will supply). Proxies must be rotated per session, with automatic failover if an endpoint becomes unresponsive.

Key Responsibilities

· Review our existing codebase (Playwright + Python) and the browser‑launch entry point.
· Design a session orchestrator that:
· Spawns multiple browser contexts simultaneously (using asyncio or threading).
· Assigns a distinct residential proxy (HTTP/HTTPS/SOCKS5 with auth) to each new context via Playwright’s proxy parameter.
· Implements rotation logic (e.g., round‑robin, random, or sticky‑per‑profile).
· Handles proxy timeouts/errors gracefully – retries with a different IP without crashing other running sessions.
· Ensure complete isolation between concurrent profiles (separate cookies, storage, localStorage).
· Add detailed logging per session (which proxy was used, response times, errors).
· Make proxy lists and rotation strategies configurable via external JSON/YAML files.
· Deliver clean, well‑tested code (unit + integration tests for concurrency).

Required Skills

· Python 3.8+ – strong knowledge of async programming (asyncio) or multithreading.
· Playwright – deep experience with browser.new_context(), proxy settings, and managing multiple contexts in parallel.
· Proxy integration – hands‑on experience integrating residential or datacenter proxy pools (with authentication) into automation pipelines.
· Concurrency patterns – proven ability to run multiple headless/headed browser instances simultaneously.
· Solid error‑handling and logging practices.
· Clear written English and ability to work independently with minimal supervision.

Nice to Have

· Experience with proxy rotation services (e.g., BrightData, Oxylabs, Smartproxy).
· Familiarity with Docker / containerised test environments.