We are building a SaaS platform that combines analytics, attribution, and engagement features into one solution. We need a backend engineer who can design and implement the MVP backend with scalability and cost-efficiency in mind. Key Responsibilities: Build secure event ingestion APIs (REST/GraphQL) with batched event support. Implement streaming pipeline (serverless queues or event brokers) to process and store events. Design and manage data storage: Hot store (real-time OLAP database) Cold store (object storage with Parquet/columnar format) Profile DB (SQL database) Implement identity resolution (merge anonymous + logged-in users). Build attribution logic (mapping user actions like clicks → installs/conversions). Create a simple campaign trigger system (event-based push/email/SMS). Ensure multi-tenant support with project-level isolation. Implement basic dashboards/APIs to fetch events, active users, funnels, and attribution reports. Ensure scalability and low infra costs (serverless-first, partitioned storage, compression). Add privacy features (data export and deletion requests). Must-have Skills: Strong experience in backend development (Go, Node.js, or Python). Hands-on with cloud platforms (AWS/GCP/Azure). Experience with event-driven systems (message queues, pub/sub, or stream processors). Proficiency in databases: SQL + real-time OLAP. Knowledge of real-time analytics pipelines and attribution logic. Familiarity with API design, authentication, and rate-limiting. Nice-to-have Skills: Experience with push/email/SMS campaign integrations. Knowledge of data privacy compliance (GDPR/CCPA). Exposure to observability tools (metrics, logging, dashboards). Deliverables (MVP Phase): Event ingestion API + SDK specification. Pipeline to store events in OLAP + object storage. Profile DB with identity resolution. Basic attribution logic. Campaign trigger (event → notification). Admin API/dashboard for reporting (users, funnels, attribution). Engagement: Duration: 2–3 months (MVP build). Type: Fixed price preferred, milestone-based. Budget Estimate: $6,000 – $15,000 USD (depending on expertise, location, and whether infra setup is included). Solo developer (3 months) → $6k–9k Small team (faster delivery, infra + dashboard polish) → $12k–15k