Senior Full-Stack Engineer

Quick Facts

• Role: Senior Full-Stack Engineer
• Work model: Elastic hybrid (1 office visit per month in Warsaw, Kraków, or the Tricity area)
• Salary: 1000–1280 PLN/MD + VAT (B2B)

Description

You will join a large-scale, cloud-based software project for a leading logistics and e-commerce organization, building highly scalable and highly available applications used by millions of users. As a Senior Backend/Full-Stack Engineer in an international team, you will also contribute to a new fintech initiative from early stages. The role emphasizes event-driven systems, REST APIs, asynchronous communication, and modern front-end development.

Responsibilities

• Build and evolve backend and frontend components for highly scalable, highly available applications
• Design and implement event-driven systems
• Work with Kafka-based architectures and asynchronous communication
• Apply distributed systems patterns such as Saga, Outbox, and Idempotency
• Collaborate on authorization flows and ledger/settlement-related processes

Requirements

• 5+ years of commercial experience as a Software Engineer
• Hands-on experience with Python and Node.js
• Strong full-stack engineering experience across backend and frontend
• Hands-on experience with React and/or Next.js
• Experience with Kafka and event-driven architectures
• Strong understanding of REST APIs and asynchronous communication
• Knowledge of state machines and distributed systems patterns (Saga, Outbox, Idempotency)
• Understanding of authorization flows and ledger/settlement processes
• English communication skills (min. B2)

Benefits

• Flexible work organization
• International work environment with experienced engineering teams
• Opportunity to make a real impact at massive scale
• Integration meetings with the Jit Community
• Ongoing professional development support