Backend Engineer Lead

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**Job Overview**:

Youll architect and build the core rails of a multi-channel messaging platform: ingest preprocess queue dispatch deliver observe, at millions of messages/hour, across WhatsApp (Meta), Google RCS, and SMS operators.

Responsibilities:

• Design & build microservices for message ingestion, validation/preprocessing, enrichment, routing, dispatch, delivery receipts, and retries.
• Concurrency at scale: implement multi-process/async workers; tune throughput, back-pressure, and graceful shedding.
• Queueing & orchestration: model queues, exchanges, routing keys, DLQs, TTLs, idempotency tokens in RabbitMQ (bonus: Kafka familiarity).
• Channel adapters: production-grade connectors for WhatsApp Cloud API, Google RCS Business Messaging, SMPP/operator REST; handle webhooks, HSM/template policies, rate limits, and error taxonomies.
• Reliability patterns: implement at-least-once semantics, retry with jitter, outbox/inbox patterns, dedupe, and exactly-once where feasible.
• Observability: structured logging, tracing (OpenTelemetry), metrics (Prometheus), SLOs, red/black dashboards, and alerting.
• Data & storage: design schemas for message states, audit trails, and compliance logs (Postgres); scalable analytics/time-series (e.g., ClickHouse/Timescale).
• Security & compliance: secrets management, key rotation, PII handling, and alignment with TRAI/DLT & operator policies.
• CI/CD & DevEx: Docker images, K8s manifests/Helm, GitHub Actions, canary/blue-green, migration discipline.
• Performance ownership: load testing, capacity planning, cost/throughput tuning.

Required Qualifications & Skills

• Language: Python 3.11+ (asyncio), FastAPI, Pydantic, aiohttp/httpx, uvicorn/gunicorn
• Workers/Queues: RabbitMQ (mandatory), Celery/Dramatiq/Arq (your call), Redis (caching/locks)
• Data: Postgres (+ SQL expertise), ClickHouse/Timescale (nice-to-have)
• Cloud & Ops: Docker, Kubernetes, Helm, Prometheus/Grafana, OpenTelemetry
• Protocols: Webhooks, REST, SMPP, OAuth/JWT, WebSockets (optional)
• Open to Go candidates with strong concurrency + RabbitMQ; or Rust for high-perf dispatchers. But Python is preferred for velocity and our current stack.

Must-have qualifications

• 5 to 9 years backend experience; 3+ years in Python in production microservices.
• Proven high-throughput systems experience (50k msgs/min or equivalent event workloads).
• Deep knowledge of queues (RabbitMQ): exchanges, bindings, nack/requeue patterns, DLQ/TTL, priority queues.
• Strong async + multiprocessing fundamentals; profiling & tuning (CPU vs I/O bound).
• API design/maintenance at scale; webhook reliability (retries, signatures).
• Solid DB design, query tuning, and idempotency strategies.
• Observability mindset: traces, metrics, structured logs; incident response.
• Nice-to-have
• WhatsApp Cloud API / RBM (RCS) / SMPP operator integrations in production.
• Rate-limiting algorithms (token/leaky bucket), distributed locks, and scheduler design.
• Experience with Kafka, NATS, or ClickHouse.
• Familiarity with TRAI DLT template flows & messaging compliance in India.