Senior Backend Engineer, Toqi (AI Life Assistant)

Salary

Core Qualifications

Key Responsibilities

• •Design, build and maintain REST and WebSocket endpoints serving the mobile app and WhatsApp surface
• •Own domain models, repository interfaces, and database migrations
• •Add new handlers and services as product features require
• •Define and version shared API contracts (protobuf) consumed by the client
• •Maintain authentication, authorisation and session handling
• •Enforce rate limits, quotas and abuse protection
• •Instrument services: structured logging, metrics, tracing and useful alerts
• •Keep linters, formatting, and tests passing
• •Extend the agent runtime: tool calling, orchestration, and third-party or portfolio API integrations
• •Manage prompt and model configuration, versioning, and evaluation harnesses
• •Control inference latency and cost through caching, batching, model routing and token budgets
• •Build and maintain the memory and context layer on Postgres and Redis
• •Handle asynchronous and long-running work: queues, retries, idempotency, dead-letter paths
• •Postgres schema design, indexing, query performance and connection pooling
• •Redis for caching, ephemeral state and pub/sub behind the real-time chat layer
• •Maintain and extend infrastructure as code (Terraform on GCP): Cloud Run services, secrets, IAM
• •Assist with deploys, rollbacks, and environment configuration
• •Implement data retention, deletion and export paths required under GDPR and LGPD
• •Support incident response and write up what happened afterwards
• •Harden the backend for scale: p95 latency, error rates, backpressure and graceful degradation
• •Forecast capacity and cost across infrastructure and model inference
• •Contribute to feature-flagged rollouts and zero-downtime migrations
• •Improve observability so problems surface before users report them
• •Help onboard future engineers to the backend codebase