AI Engineer Internship

Mason - Accelerating development of the built world Mason is on a mission to accelerate the development of the built world. We are tackling some of the most pressing challenges of our time - housing shortages, energy constraints, and decaying infrastructure - all of which are exacerbated by the slow pace of physical development. This is one of the largest, least-modernized markets in the world. Trillions of dollars in spending, almost no real software. We create AI employees that are speeding up development for some of the largest REITs, institutional developers, and asset managers in North America. Our founding team comprises of a repeat founder that exited to a Fortune 500, a previous tech lead at Meta SuperIntelligence, and a development director that built $2B+ of projects. We combine expert services with AI agents so teams can move faster, eliminate errors, and scale with precision. What you’ll build Agent-based systems that run long-lived, stateful workflows Production AI agents that own real developer workflows end to end Document ingestion and pipelines across PDFs, policies, drawings, and emails Retrieval, reasoning, and eval layers that improve continuously in production Secure, multi-tenant infrastructure for enterprise customers Customer-facing product surfaces in Next.js and TypeScript Internal tools that let a very small team ship extremely fast Tech stack and tools Frontend Next.js, TypeScript, modern React Backend TypeScript and Python services AI Claude, OpenAI, multi-agent systems, structured outputs, eval pipelines Frameworks LangGraph, Claude Agent SDKs, MCP tools, emerging agent runtimes Infra Cloud-native deployment, CI/CD, monitoring, security-first design Tooling Claude Code, Cursor, internal coding agents used daily We optimize for leverage, learning speed, and systems that actually hold up in production. What we’re looking for High ownership, high agency, own the outcomes not the code Experience building and shipping AI agents to production Strong software fundamentals and good systems intuition Comfort owning infra, deployment, reliability, and security Familiarity with data processing and document-heavy workflows Fast learner who actively adopts new tools and frameworks Customer-obsessed. You care deeply about outcomes Team and culture CEO is a second-time founder who sold his last company to Coinbase CTO is a former Staff Engineer at Meta Superintelligence and founded Meta AI COO has led over $2B in real estate development Backed by top investors, operators, and even major development firms Working directly with teams managing billions in AUM Small, intense, low-ego team that genuinely enjoys working together Regular board game nights, lots of laughs, no corporate nonsense Remote today, with SF and NYC hubs coming soon If you want to join a team of winners and re-define the built world - let’s talk ) Apply To This Job