Senior Software Engineer

Proper AI is an AI-first accounting service built for property managers and real estate operators. By combining automation, technology, and a global team of accounting experts, we deliver faster, more accurate financial operations at scale. We’re a team of builders, problem-solvers, and operators from around the world, working together to modernize one of the most critical functions in real estate. Learn more at We are looking for a Senior Software Engineer with strong backend and systems fundamentals to help own the core of our platform: the services, data models, and automations behind workflow and productivity tooling for B2B accounting operations. This is a depth role, not a breadth role. The work is logic-heavy — multi-service data flows, third-party platform integrations, and document-processing pipelines where correctness matters more than surface area. The engineer will be a technical counterpart to the Tech Lead on architecture, and will take ownership of our AI-backed document processing service. The ideal candidate is language-agnostic in outlook but deep in practice: comfortable moving between Go, Python, and TypeScript, and able to build a real working model of an unfamiliar system before changing it. Key Responsibilities Core Functional Responsibilities Design, build, and maintain backend services across a microservices estate (Go, NestJS/TypeScript, Python). Own the AI-backed document processing and classification service (Python/FastAPI): extraction quality, accuracy measurement, and the pipeline around it. Design and maintain integrations with third-party platforms, including authentication, sync cadence, retries, and recovery. Model data deliberately — schemas, migrations, and invariants that hold as the product changes. Debug across service boundaries: correlate behaviour across multiple systems and databases to find the actual cause. Build observability and provenance into automated flows: actions should be traceable, auditable, and reconstructab