Senior/Staff Backend Engineer, Backend Platform

What you’ll do

• Build paved-road patterns under the Python/Flask API layer (REST + GraphQL, auth, permissions, migrations)
• Implement the Flask→FastAPI migration path
• Define and implement production observability standards
• Build and maintain AI dev platform components (DevDawg cloud dev environments and Spice agent layer)
• Make Spice safe across more of the code review surface

What they’re looking for

• Deep Python experience
• Experience shipping LLM/agentic work to real users
• Daily coding-agent use with a clear POV
• Strong observability and API design instincts

Skills

• Python: Flask, Flask→FastAPI, ciso8601, deep Python
• FastAPI: Flask→FastAPI path
• GraphQL: GraphQL, REST + GraphQL
• TaskTiger: TaskTiger
• Rust: Rust
• TypeScript: TypeScript
• Kafka: Kafka
• Redis: Redis
• MongoDB: MongoDB
• PostgreSQL: PostgreSQL
• Elasticsearch: Elasticsearch
• Docker: Docker
• Kubernetes: Kubernetes
• AWS: AWS
• LLM / agents: shipped LLM/agentic work, Spice (agent layer), daily coding-agent use
• Observability: production observability standards, strong observability instincts
• API design: API design instincts, auth, permissions, migrations

The post

Remote (US) Close (https://close.com) | Senior/Staff Backend Engineer, Backend Platform | Full-time

We're bootstrapped, profitable, and 130 people, all remote, building an AI-powered CRM. We're spinning up a new Backend Platforms team and you'd be one of the first hires — unusual influence over what it owns.

You'd build for other engineers: the paved-road patterns under our Python/Flask API layer (REST + GraphQL, auth, permissions, migrations), the Flask→FastAPI path, production observability standards, and our AI dev platform — DevDawg (cloud dev environments for the whole stack) and Spice (our agent layer that already auto-approves simple PRs). Making Spice safe across more of our review surface is the team's biggest project.

Stack: Python, Flask, FastAPI, GraphQL, TaskTiger, Rust, TypeScript, Kafka, Redis, MongoDB, PostgreSQL, Elasticsearch, Docker, Kubernetes, AWS.

Looking for: deep Python, shipped LLM/agentic work to real users, daily coding-agent use with a real POV, strong observability and API design instincts.

Also: ~5 weeks PTO + winter break, optional 4-day week at 80% pay, 1-month sabbatical every 5 years, 99% of medical premiums covered, 401k match to 6%.

Our code: https://github.com/closeio (TaskTiger, SocketShark, ciso8601) Eng blog: https://making.close.com Apply: https://jobs.ashbyhq.com/close/5bf4629b-d2ee-4129-980f-e31b96185c9c