Software Engineer - Member of Technical Staff (Platform)

About Mithril Mithril is an AI infrastructure platform built to make GPU compute more accessible and affordable for the world’s leading enterprises, AI startups, and the AI research community, including LG AI Research, Saronic, and the Broad Institute (among many others). Founded by a former Google DeepMind research scientist and Stanford CS PhD, Mithril has raised $80M across seed and Series A funding led by Sequoia Capital & Lightspeed Venture Partners. Platform revenue has grown >6x over the past year, and we were recently recognized by Fast Company as the 8th Most Innovative Company in Artificial Intelligence for 2026. We are at an inflection point: transitioning from bare-metal operations to a cloud-native, multi-provider platform with a differentiated auction and flexibility model. You would be joining at the moment the platform is being built, not inherited. About the Opportunity You will work across Mithril's three core engineering areas — Consumption (the developer-facing product, billing, and API surface), Platform (the orchestration and marketplace engine), and Supply (integrations with cloud providers and capacity management). You will own meaningful slices of each, shipping features end-to-end against a product that handles real revenue and business-critical customer workloads. This is not a single-domain role. You'll move between backend systems, marketplace logic, and customer-facing surfaces — with direct exposure to the architectural decisions shaping how Mithril scales. What Makes This Role Different Most early-stage engineering roles at infrastructure companies are either deep in systems (little product surface) or deep in product (little systems exposure). At Mithril, you'll work across both: the orchestration engine that manages GPU capacity across providers, and the developer-facing surfaces that customers use to reserve, bid, and consume that capacity. The systems you build will handle real money, real workloads, and real market dynamics — spot auctions, reservation pricing, and capacity allocation across a heterogeneous supply base. If you want to understand how GPU infrastructure markets actually work and build the systems that run them, this is that role. Core Responsibilities Backend & API Build and maintain backend Python APIs powering Mithril's reservation, bidding, billing, and usage surfaces — including usage visualization and the billing platform. Write and maintain database migrations, design relational schemas for complex multi-entity models (orders, allocations, grants, quotas), and optimize queries for performance. Own features end-to-end: from design doc through backend API, database migration, feature flag rollout, and monitoring. Platform & Marketplace Design and implement orchestration primitives for flexible reservations: pause/return credits, reservation extensions, capacity algorithm updates, and the auction model connecting spot and reserved capacity. Contribute to operational mat...