Senior Backend Engineer: AI-Driven Data Platforms

Proper; United States; Remote; USD 150,000 - 180,000; Full time

Job summary

Proper AI is seeking a Senior Software Engineer to own the core backend, data models, and AI-backed document processing services for B2B accounting operations. The role emphasizes depth over breadth across multi-service data flows and third-party integrations.

You’ll work across Go, Python, and TypeScript, design scalable schemas, ensure reliability with observability, and mentor mid‑level engineers while collaborating with Product and Ops.

Qualifications

• Backend services in Go and/or Python; TypeScript/Node useful.

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 reconstructable after the fact.
• Design for safe automation: idempotency, pre/postconditions, dry-runs, and guardrails on anything that writes to a customer’s system of record.
• Write clean, tested, maintainable code, and leave the systems better instrumented than found.

Skills

Backend engineering depth

Data modelling

Distributed debugging

Third-party integration

Reliability practice

Testing and evaluation

Cloud and infrastructure

LLM-backed services

Education

Bachelor’s or Master’s in CS or related field

Tools

GCP

Cloud Run

Cloud SQL

Pub/Sub

Docker

CI/CD

Job description

Proper AI is seeking a Senior Software Engineer to own the core backend, data models, and AI-backed document processing services for B2B accounting operations. The role emphasizes depth over breadth across multi-service data flows and third-party integrations.

You’ll work across Go, Python, and TypeScript, design scalable schemas, ensure reliability with observability, and mentor mid‑level engineers while collaborating with Product and Ops.