Role Description Looking for a Senior Backend Engineer (Node.js / Scraping Automation) to design and build the backend behind the auto-apply platform with a strong focus on ATS/job-board scraping and automation. This includes: - Browser automation - CAPTCHAs - IP blocking - Email-based verification flows - Multi-step login/sign-up journeys - Workers, queues, orchestration, status tracking, APIs, and observability What You’ll Do: - Design and develop a reliable web scraping & automation layer: handle and minimise CAPTCHAs, deal with IP blocking (IP rotation, proxies, rate limiting), automate systems with email verification, verification codes/links, logins, and other multi-step flows. - Design and develop the backend for the auto-apply system. - Build and scale high-load services: workers, task queues, flow orchestration. - Build a platform that scales reliably: retries, deduplication, throttling, graceful degradation, timeouts. - Design an architecture that scales across multiple ATS and job boards. - Design an architecture that supports horizontal scaling and remains resilient to unstable external systems, UI changes, deadlocks, and partial failures. - Set up monitoring and alerting for critical systems (CAPTCHA spikes, blocks, failure rates by ATS, queue health, etc.). - Work with the Tech Lead to shape realistic technical requirements, API contracts, and pragmatic implementation decisions. Qualifications - 5-6+ years of commercial backend experience. - Strong production experience with Node.js (TypeScript preferred). - Practical production experience with Go and/or Python for scraping, automation, or integration-heavy services. - Hands-on production experience with web scraping / browser automation: Playwright / Puppeteer / Selenium, dynamic websites, SPAs, unstable external systems, and anti-bot / anti-scraping constraints. - Strong understanding of anti-bot / anti-scraping constraints: CAPTCHAs, IP blocking, proxies, session persistence, throttling, redirect loops, retries, and timeouts. - Experience building high-load distributed systems with microservices, workers and queues, designed for fault tolerance and scalability. - Confident with Postgres, Redis and NATS (or similar message brokers) in production. - Experience automating complex multi-step flows, including signup, login, email confirmations, verification codes, magic links, and application submission journeys. - Strong focus on security and data privacy (PII, tokens, encryption). - Ability to design and document HTTP APIs (REST, Swagger / OpenAPI). Requirements - Experience in fast-growing startups where autonomy and ownership are key. - Background in systems sensitive to anti-fraud / anti-bot measures (fintech, ticketing, e-commerce, marketplaces, etc.). - Experience with observability tooling: Prometheus / Grafana, ELK / OpenSearch, Sentry, etc. - Understanding of ATS and job boards (Workday, Greenhouse, Lever, SmartRecruiters, Indeed, LinkedIn, etc.). Benefits - Market-level compensation - Office/hybrid in Warsaw or fully remote from nearby time zones (CET ±2). - 20 paid working days of vacation per year + 5 sick leaves.

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