Senior Back-End Developer, Engineering (Java / Kotlin)

At least 6 years of experience in software development Specialized in finance or crypto within the technology industry Excellent analytical, critical thinking, and problem-solving skills in financial technology contexts Outstanding testing practices, TDD, unit, integration, e2e testing, (JUnit or similar frameworks) Ability to manage, coordinate, and prioritize work with multiple team members Strong communication skills and an ability to collaborate cross-functionally Able to explain technical concepts to both technical and non-technical stakeholders Must be located in the Americas or Europe (between time zones UTC-5 and UTC+3) Solid track record of over 10 years demonstrating mastery of Java, Kotlin, Swift, mainly in production applications Solid experience in administration, modeling, optimization techniques in SQL and NoSQL databases Knowledge of software for interface prototyping and wireframing like Figma Understanding of Git and branching models for coordination with team members

Take end-to-end ownership of features (backend, API, frontend integration, deployment) Design and build new modules (exchange connectors, order routing, wallet / transaction modules, alerts engine) Improve, maintain, and scale existing services Implement, enforce, and monitor APIs to external crypto exchanges (REST, WebSocket, FIX where applicable) Work on state synchronization, caching, rate limits, backpressure, and resilient connectivity Ensure system security and correctness (authentication, authorization, encryption, safe handling of keys / wallets) Participate in architectural decisions and roadmap planning Occasionally interface with DevOps / infrastructure to deploy, monitor, and maintain production services