About the Role
We're looking for a Senior Backend Engineer to join our backend team and take ownership of building, maintaining, and evolving our microservices. You'll work across both stacks - maintaining existing Node.js services and building new ones in Kotlin - contribute to architecture decisions, and help us maintain high standards of quality and reliability.
Responsibilities
•Design, build, and maintain scalable backend services across Node.js and Kotlin stacks
•Write clean, well-tested code - testing is a first-class concern
•Own features end-to-end: decompose tasks and make technical decisions
•Maintain and evolve existing NestJS services while building new services in Kotlin/Spring
•Occasionally build internal tools and admin interfaces using React
•Collaborate with product, DevOps, and engineering teams on cross-functional delivery
•Participate in code reviews, architecture discussions, and continuous improvement of system reliability and observability
Requirements
•Strong production experience with Kotlin or Java, and Spring
•Comfortable working with Node.js and NestJS for maintaining existing services
•Strong testing practices
•Deep understanding of software architecture, design patterns, and microservices
•Experience with AWS services — Lambda, SQS, S3, and others
•Experience with containerized environments and Kubernetes
•Good communication and collaboration skills
Nice to Have
•Experience in fintech, crypto, or payment systems
Conditions
•Work alongside a team of skilled engineers on a product used by millions
•Build with a modern, thoughtfully chosen tech stack
•Minimal bureaucracy and fast decision-making
•Real ownership - influence the product, architecture, and business outcomes directly
•Room to grow technically and shape the platform's future
•Stability, development, participation in the future unicorn's growth
•Remote work from anywhere in the world
•Competitive salary in EUR/USDT
•Unlimited vacation
•Birthday presents
•Compensation for the purchase of necessary technical devices for the work
•Paid sick leaves
