About the RoleWe are looking for a Senior Fullstack Developer with strong backend expertise in Kotlin and Java, and solid understanding of frontend technologies. You will play a key role in stabilizing and evolving a B2B portal for the waste disposal industry, where clients order specialized boxes and tools for the disposal of toxic waste, car batteries, and more. Your Responsibilities Lead application stabilization (First 3 months): Resolving maintenance issues and performance bottlenecks. Upgrade and manage dependency packages to ensure system stability. Identify and fix security vulnerabilities, implementing best practices. Optimize CI/CD pipelines using GitHub Actions/GitHub Runner. Drive feature development (From month 4 onwards): Design and implement new features for the B2B portal. Contribute to frontend development using React (nice to have). Ensure scalability, reliability, and security of the platform. Participate in architecture decisions, code reviews, and technical documentation. Requirements Kotlin and Java – strong experience required. Terraform – experience with infrastructure as code. English – communicative level. React – basic knowledge Nice to have React – more than basic knowledge (nice to have). Basic knowledge of Azure Cloud (nice to have). GitHub Actions / GitHub Runner – CI/CD experience.  We Offer MultiSport card LuxMed medical package Allianz group insurance Value-based work culture Flexible working hours and remote work options