Lead Engineer

N-iX is looking for a Lead Engineer for one of our clients.

The first Israeli SMS aggregator - connecting businesses of all sizes to the world with an API that developers love with a live large-scale messaging platform powering tens of millions of events daily under strict SLA requirements. We provide the backbone infrastructure that enables reliable and real-time communication at scale.

Role mission
Join the core engineering team of client a live large-scale messaging platform and act as a production-grade backbone engineer responsible for systems processing tens of millions of events per day under strict SLA requirements.

This is a long-term full-time role focused on stability scalability and reliability rather than feature velocity at the expense of will be expected to demonstrate enterprise-grade messaging platform knowledge including SMS routing delivery reports (DLRs) concurrency provider integrations and advanced performance optimization at scale.

Key Responsibilities:

• Design develop and maintain large-scale messaging and event-driven backend platforms.
• Drive migration initiatives from monolithic to microservices architectures.
• Champion low-latency real-time system operation (WebSockets streaming pipelines).
• Ensure reliability and observability through strong monitoring and incident handling systems.
• Collaborate and integrate deeply with the engineering team to guarantee long-term platform evolution and quality.
• Take architectural ownership of critical backend flows independently identify bottlenecks and drive solutions in high-volume transactional environments.
• Work with queue architecture (RabbitMQ / Kafka / similar) and implement best practices for rate limiting retry logic and failure isolation.
• Optimize APIs and database performance under high load.
• Integrate and optimize webhooks async processing and delivery/reporting mechanisms.

Mandatory Experience:

• Backend Engineering: 6 years of hands-on backend experience.
• Expertise: TypeScript at a production and expert level.
• Architecture: Microservices design and migration from monoliths.
• API Design: REST OpenAPI / Swagger.
• High-Load Messaging: Proven experience with high-throughput systems; message queues/event-driven (Kafka or RabbitMQ mandatory).
• Resilience: Handling backpressure retries DLQs idempotency rate limiting failure isolation.
• Realtime Systems: Experience with realtime systems (WebSockets WebRTC streaming pipelines) processing telemetry or delivery reports.
• Databases & Caching: PostgreSQL/MySQL (schema design performance tuning) Redis for caching/buffering.
• Cloud & Deployment: Strong experience with GCP Docker CI/CD pipelines.
• Observability: Prometheus Grafana Datadog Sentry or Kibana.
• Production Readiness: Experience in incident response and on-call rotations.
• Experience with SMS routing delivery reports (DLRs) and integrating multiple messaging providers is highly preferred.
• Demonstrated capability to optimize systems for scalability monitoring and bottleneck analysis.

Strong Advantages (Nice to Have):

• Payments fintech or banking system experience.
• Security and authentication (JWT OAuth2).
• Infrastructure as Code (Terraform).
• Kafka at scale.
• Technical leadership system ownership roles.
• Experience with unstable third-party APIs.