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Founding Staff Engineer at Rockstar. Rockstar is recruiting for a super-senior full-stack engineer to join a dynamic, early-stage team building an integration-heavy data platform. This is a foundational, hands-on role where you will own how data is ingested, normalized, validated, and served from messy real-world systems, with the path to grow into a hands-on technical lead.. What you’ll do (hands-on, end-to-end). - Build full-stack product features end-to-end: frontend UI, backend APIs/services, data pipelines, deployment and observability.. - Own the integration strategy and connector architecture across multiple vendors and authentication patterns (OAuth/API tokens/read-only portal access/automated exports).. - Design and implement data ingestion and processing primitives: retries, idempotency, backfills, schema evolution, and anomaly detection.. - Create a flexible canonical data model and mapping layer that can normalize structural + semantic differences across systems (e.g., different definitions of revenue/net sales/business day).. - Build the metrics/semantic layer that powers product experiences and deterministic tool outputs (numbers must be correct and auditable).. - Implement data quality and validation workflows so failures are observable and fixable (quarantine/error surfacing instead of silent wrongness).. - Make sound build vs buy recommendations for integration tooling and infrastructure (unified APIs, managed ETL, warehouses, observability, etc.).. - Work directly with the founder and pilot partners to unblock access issues, validate data, and iterate quickly.. What we’re looking for. - 10+ years building production software; prior Staff/Principal level or equivalent.. - Proven full-stack ownership: you can ship UI + backend + data pipelines without needing separate specialists.. - Strong TypeScript experience (frontend and backend); Python experience is a plus (not required).. - Deep experience with data engineering fundamentals: SQL, modeling, ETL/ELT, event-driven ingestion, reconciliation/validation, and operationalizing pipelines.. - Experience building and maintaining multiple third-party integrations (API design, rate limits, auth, retries, monitoring, vendor quirks).. - Strong systems design judgment: you choose tools/architecture based on constraints and tradeoffs, not familiarity.. - Comfortable operating in ambiguity with real customers and aggressive timelines.. Nice-to-haves (domain + tooling). - Experience integrating with operational systems such as POS, labor/scheduling, payroll/timekeeping, accounting/ERP, inventory/COGS, purchasing/ordering, or analytics/BI.. - Experience with Postgres and an OLAP/warehouse (ClickHouse/BigQuery/Snowflake/Redshift) and building a metrics layer.. - Experience designing multi-tenant SaaS with strong security primitives (RBAC, row-level security patterns, audit logging).. - Experience building internal admin tools (integration status, data freshness, backfill tooling, customer support tooling).. Compensation. Competitive cash + meaningful equity (structured for a founding hire). The team is intentionally optimizing for fewer, higher-caliber engineers rather than a lead + juniors model.. Company Location: United States.