Software Engineer (Java / Kotlin)

Allegro is the most popular shopping platform in Poland and the largest e-commerce platform of European origin. It operates a marketplace model with over 135,000 merchants and offers over 250 million offers across key categories. The platform reaches 22 million customers monthly, offers fast and free deliveries under Allegro Smart!, and includes modern financial services and a wide pickup network.

• Strong background in Kotlin and backend architectures (Spring)
• Willingness to actively learn and write code in TypeScript, JavaScript, and React (full-stack orientation)
• Product-oriented mindset and eagerness to solve complex business and technical challenges
• Commitment to code quality, craftsmanship, and openness to feedback during code reviews
• Ability to look for effective solutions, including designing dynamic API contracts
• Hunger for constant development in backend, cross-platform rendering, Server-Driven UI, and applied Agentic AI
• English at B2+ level (effective communication)
• Minimum 2 years of experience in a similar position
• Knowledge of TypeScript, Kotlin, React, Java, JavaScript, and Spring

• Building and scaling Opbox Studio, a next-gen React-based stack for native UI experiences delivered from the backend
• Developing Server-Driven UI platform as part of the Core Platform team
• Working with Agentic AI-first approach, leveraging AI agents to automate UI generation and layout logic
• Designing dynamic API contracts and handling complex JSON-based component tree structures
• Bridging backend microservices (Kotlin/Spring) with modern web technologies (TypeScript/React)
• Collaborating with various product teams to ship tools used by hundreds of engineers
• Participating in code reviews, knowledge sharing, and continuous improvement of Developer Experience