Senior Platform Engineer (Onsite - SF)

About this role

Senior Platform Engineer Why Seam? We build IoT infrastructure that powers smart devices globally. If you've used a code to enter an Airbnb, you've probably used Seam. Our customers range from startups to public companies. Platform engineering here is a force multiplier—you'll directly impact every customer and every line of code we ship. Our team includes alums from Nest, Apple, Stanford, YC. Backed by Tiger Global, Root VC, and founders from Stripe, Plaid, Airbnb. About the role We're looking for a Senior Platform Engineer to join our 3-person platform squad. You'll own the systems that make our engineering team productive and our APIs reliable. Your focus: build efficient TypeScript tooling that lets engineers ship device integrations in days instead of weeks, create fast testing infrastructure, scale our background workers, and improve observability across our platform. We're growing rapidly into enterprise and need rock-solid infrastructure without sacrificing developer velocity. We value pragmatism over perfection. Ship fast, learn quickly, iterate. You should be comfortable diving deep into TypeScript, optimizing PostgreSQL queries, and teaching the team what you learn. What you'll work on Platform Infrastructure - Design systems handling millions of API requests and complex background jobs for device communications Developer Experience - Build TypeScript tooling and frameworks that accelerate integration development, improve code sharing, create abstractions that let engineers ship faster Performance & Scale - Optimize PostgreSQL queries, design caching strategies, ensure our platform handles 10x growth Testing & Reliability - Transform testing from bottleneck to competitive advantage   About You We look for people with sharp minds with kind souls. You are: Self-driven - identify problems before they're assigned Pragmatic - ship solutions that work today, build for tomorrow Collaborative - work closely with product engineers Clear communicator - explain complex systems simply Qualifications 5+ years backend engineering with platform/infrastructure focus Expert TypeScript and PostgreSQL (query optimization, scaling) Strong distributed systems and background job processing experience Experience building fast, reliable CI/CD pipelines Infrastructure as code experience ## Preferred Qualifications Experience building developer tooling and frameworks API-first or developer tools company background Observability tools (DataDog, Grafana)   Interview Process Technical screen (45 min) System design (45 min) Paid work trial day with the team   Benefits 100% employer-paid health insurance + 75% dependent coverage 401K, family-building support, mental health services Generous PTO Daily lunch in SF office $170k - $220k base + meaningful equity In-person role in San Francisco