Fullstack Software Engineer

Wakacje.pl is an e-commerce platform and a network of travel agencies offering a wide range of travel products. Since 2015, it has been part of Wirtualna Polska Holding, Poland’s largest group of media and e-commerce companies. Together with Travelplanet.pl and the Invia brands across CEE, they are building a unified travel group driven by a shared #TravelMindset.

• Strong experience with Node.js (production-grade APIs, async patterns, error handling, performance optimization).
• Solid knowledge of JavaScript / TypeScript and modern backend architecture (REST, middleware, validation, auth).
• Experience with API integrations (payments, CRM, external services) and handling edge cases.
• Practical experience with logging, monitoring, and debugging in production environments.
• Understanding of performance optimization and scalability in high-traffic transactional systems.

Nice to have:

• Experience with Bun or alternative JS runtimes.
• Familiarity with Redis (caching, session handling, rate limiting).
• Experience with Server-Sent Events (SSE) or real-time communication patterns.
• Knowledge of system observability tools (e.g., Grafana, ELK stack).
• Experience in e-commerce / booking / checkout systems with conversion-focused optimization.

• Designing, implementing, and maintaining functionality of JavaScript/TypeScript-based applications used by internal and external clients.
• Ensuring the codebase is clean, maintainable, scalable, and aligned with engineering best practices.
• Monitoring application health using technical and business metrics (e.g., Grafana dashboards) and reacting to anomalies or incidents.
• Optimizing existing solutions, improving performance, and ensuring reliability of critical system flows such as checkout and payments.
• Collaborating closely with business stakeholders and product teams to translate requirements into technical solutions and continuously improve the product.
• Working with databases to analyze data, debug issues, and ensure correct data flow between services.
• Proposing and implementing new ideas, selecting appropriate technologies, and contributing to architectural decisions.
• Creating and maintaining unit and integration tests to ensure stability and long-term maintainability of the system.