Senior Backend Engineer

CaliAlfa (Previously Alfabet) · herzliya

At CaliAlfa, we’re building the next generation of gaming technology, powering online casino and sportsbook experiences for millions of players. We develop scalable backend infrastructure and high-performance systems that power critical gaming operations, including player account management, wallet transactions, payments, bonuses, and third-party integrations. We’re looking for a Senior Backend Engineer who thrives in complex, high-scale environments and wants to take ownership of core backend systems powering millions of player interactions. What You'll Be Doing: Architect and develop scalable, high-performance backend systems supporting our online casino platform. Design and build core microservices and APIs for player accounts, wallet transactions, payments, bonuses, and account lifecycle management. Develop and maintain integrations with external gaming providers, payment gateways, and third-party APIs. Build reliable, event-driven systems capable of handling high-volume transactions and real-time operations. Work closely with product managers, analysts, and engineers to understand business requirements, challenge assumptions, identify edge cases, and propose effective technical solutions. Take ownership of features end-to-end, from technical design and implementation to deployment and production monitoring. Set high standards for code quality, testing, system reliability, and maintainability. Troubleshoot production issues and ensure system stability and availability in a high-traffic environment. Design, develop, and deploy AI agents and AI-powered solutions into production environments. What You Bring: 5+ years of experience building backend applications in production environments. Strong hands-on experience with Java (17+) and a modern framework such as Spring Boot. Hands-on experience designing, building, and deploying AI agents or LLM-based features to production, including tool calling, orchestration, and integration with backend systems. Experience building systems where data integrity and consistency are critical, such as transactional flows, orders, payments, or billing. Strong relational database skills (PostgreSQL or similar): schema design, transactions, locking, and query performance. Deep knowledge of message brokers (Kafka, RabbitMQ, or similar) and event-driven architectures, including idempotency and retry semantics. A testing habit: unit, integration, and contract testing as part of how you work. A self-starter mentality with a strong sense of ownership, from idea to production. Bonus Points: Experience with Kotlin. Experience with agentic frameworks and evaluating, monitoring, and improving AI agents in production. Experience in online casino, iGaming, sports betting, fintech, or other regulated, high-transaction-volume domains. Familiarity with compliance-driven development (KYC/AML, responsible gaming, audit requirements). Experience with Redis (caching, pub/sub, distributed locks). Cloud-native experience with AWS (ECS, Lambda, RDS) and Kubernetes.

Apply »