• Design and build backend frameworks and services used across the company • Own and evolve critical shared systems, including APIs, realtime transport, and job orchestration • Improve reliability, performance, observability, and security of foundational backend infrastructure • Partner with product teams to turn recurring needs into shared abstractions • Lead technical design discussions and help set architectural direction • Drive refactors, migrations, and system upgrades that reduce long-term complexity • Improve internal tooling to support debugging, operations, and customer-facing workflows • Mentor other engineers and contribute to strong engineering standards and practices