Senior Full-Stack Developer (Backend Focus)

As a Senior Full-Stack Developer (Backend Focus) at LvlUp Labz in Mumbai, your primary responsibility will be to architect and build Node.js microservices for an iGaming platform, focusing on real-time odds updates, high-frequency transaction processing, and event streaming infrastructure. While backend systems will be your main focus, you'll collaborate with frontend developers and contribute to React code when required. **Key Responsibilities:** - Design and build Node.js microservices for bet placement, settlement, and real-time odds processing - Architect WebSocket infrastructure for live betting updates using Socket.io - Implement Kafka event streaming for high-frequency transaction processing - Optimize PostgreSQL queries for sub-100ms response times at scale - Build REST APIs and integrate with third-party betting data providers - Review and contribute to React/Next.js frontend code as needed - Deploy and monitor production systems using Docker and AWS - Mentor junior developers on backend architecture and best practices - Collaborate with cross-functional teams in an agile environment **Qualifications:** **Required:** - 4-6 years of professional experience in full-stack development - Strong expertise in Node.js (Express, Nest.js) and backend architecture - Proficiency in modern technologies: React, Next.js, TypeScript - Experience with microservices architecture and API design - Real-time systems experience (WebSocket, Socket.io, or similar) - Message queue knowledge (Kafka, RabbitMQ, Redis Streams) - Strong PostgreSQL skills (query optimization, indexing, transactions) - Experience with Docker and AWS cloud services - Excellent problem-solving and communication skills - Bachelor's degree in Computer Science, Engineering, or related field **Nice to Have:** - Experience in fintech, iGaming, or high-frequency trading platforms - Prisma ORM or TypeORM experience - Redis caching strategies for real-time applications - Kubernetes deployment experience - Understanding of betting/gaming platform mechanics At LvlUp Labz, we embrace "Vibe Coding" using AI coding tools like Cursor, Claude Code, and GitHub Copilot daily to accelerate development and focus on solving complex problems rather than repetitive tasks. If you're not already using these tools, you'll learn quickly. Join us in building high-performance betting systems with our tech stack that includes Node.js, Express, Prisma ORM, PostgreSQL, Socket.io, Kafka, Redis, React, Next.js, TypeScript, Redux Toolkit, Docker, Kubernetes, AWS, Nginx, Prometheus, and Grafana. Apply now as we are reviewing applications daily and moving quickly on qualified candidates.,