Senior Fullstack Software Engineer

About Wakacje.pl

We are an e-commerce platform and a network of travel agencies offering a wide range of travel products. Since 2015, we have 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, we are building a unified travel group driven by a shared #TravelMindset. In our daily work, we #Explore better ways to grow, #Engage through real ownership and teamwork, and #Enjoy building experiences that people genuinely look forward to. 

Send us your CV and… see you at Wakacje.pl! ✈️ 

Key responsibilities:

• 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.

Requirements:

• Min. 5 years of experience with React.js and Next.js or Nest.js or Express.js​

• 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

• SEO / Core Web Vitals / Google Analytics / Web Accessibility

What do we offer:

Workplace safety and comfort:

• Employment based on an employment contract or B2B,

• Full support during the onboarding period under the supervision of an engaging leader/buddy.

Business agency and agility:

• Real influence on business decisions, the ability to take initiatives and implement your ideas.

Development within the organization:

• Individual Development Plan,

• Participation in training courses and conferences to enhance professional competencies.

All-inclusive for Employees:

• A benefits package that you can use according to your preferences – Lux Med medical care, Health and Life Insurance (PZU and Warta), Multisport card, shopping and lunch vouchers, and many other cafeteria offers available on the Worksmile platform,

• Study Tour – trips abroad to explore our product offerings (destination tours and hotel audits),

• A training and webinar package supporting professional and personal development,

• Discounts on our products for employees and their families,

• Work in the modern Alchemia office complex – Neon building, 100 meters from the Gdańsk Przymorze-Uniwersytet SKM station,

• Teambuilding events for the start and end of the tourist season – check them out: Instagram, LinkedIn, Tiktok, Facebook,

• Mini events, delicious coffee, and on Mondays, hot chocolate,

• Casual dress code.

Ready to join the team with a #travelmindset? We’re waiting for you!