Senior Full-Stack Engineer (Kotlin / Spring) – OnsightsAbout the RoleOnsights is an AI startup bringing advanced e-commerce analytics to brick-and-mortar retail.We’re looking for a remote, full-time B2B Full-Stack Engineer with strong backend skills and B2-level English.You’ll help design, build, and scale our core systems, working closely with backend, frontend,and data science teams on high-performance data collection and analytics platforms.What You’ll Work On Build and maintain backend APIs in Kotlin using Spring Framework Develop scalable services for data ingestion and processing Work with SQL/NoSQL databases (focus on performance and reliability) Integrate with internal and external systems Ensure platform security, stability, and scalability

Participate in code reviews and mentor junior engineers

Tech Focus 70% Backend: Kotlin, Spring, Java 20% Databases: SQL/NoSQL, optimization, performance <10% Frontend: React

Plus: TypeScript, Python, AWS (EC2, S3, SQS, EventBridge)

What We’re Looking For Master’s in Engineering or related field 8+ years full-stack experience, Expertise in media streaming technologies, services, protocols, and formats Experience with Spring, .NET, and frontend development with React Proficiency in Java/Kotlin, TypeScript, SQL, Python Hands-on experience with AWS (EC2, S3, SQS, EventBridge) English at B2 level