Senior Backend Engineer

About the role

We are looking for a Senior Backend Engineer to design, build, and scale the core services of our mobile gaming platform. You will own end‑to‑end development of high‑impact systems such as wallets, rewards, transactions, fraud detection, and payouts, ensuring they remain reliable and performant at scale.

Key responsibilities

• Design, develop, and maintain scalable backend services using Node.js, TypeScript, and NestJS with clean architecture.
• Build and manage wallet, reward, and transaction systems, guaranteeing accurate balances and consistent user state.
• Implement ledger‑based financial processing, ensuring traceability, concurrency safety, and idempotency.
• Develop payout workflows, external payout handling, reconciliation, and failure recovery mechanisms.
• Create fraud detection logic using behavioral rules, velocity checks, and device signals.
• Optimize PostgreSQL queries, indexing, schema design, and overall database performance under heavy load.
• Utilize Redis for caching, idempotency, and performance tuning.
• Integrate message queues (Bull, BullMQ, SQS, Kafka) for reliable asynchronous processing.
• Monitor production systems on AWS, debug live issues, and lead incident response and root‑cause analysis.
• Collaborate with mobile and product teams to define API contracts and ensure seamless integration.

Required profile

• 3–6+ years of backend development experience.
• Strong expertise in Node.js, TypeScript (strict mode), and NestJS or similar frameworks.
• Deep knowledge of PostgreSQL (transactions, indexing, migrations, query optimization).
• Extensive experience with Redis for caching and performance optimization.
• Hands‑on experience with AWS services such as ECS, RDS, ElastiCache, ALB, and Secrets Manager.
• Proven ability to design and maintain high‑concurrency, transaction‑heavy financial systems.
• Experience building fraud detection or anti‑abuse solutions at scale.

Required skills

• Node.js
• TypeScript
• NestJS
• PostgreSQL
• Redis
• Message queues (Bull, BullMQ, SQS, Kafka)
• AWS (ECS, RDS, ElastiCache, ALB, Secrets Manager)
• Git workflow and code review practices
• Jest or similar testing frameworks