Backend Engineer (Senior/Staff)

The role

You will architect and build foundational backend systems, including data models, automation pipelines, and real-time tax calculation logic. You will work with founders, engineers, and tax SMEs to scale a global sales tax engine.

What you will do

• Design and implement core backend services including data modeling and compliance logic.
• Build scalable systems to monitor, calculate, and apply transaction taxes.
• Develop and maintain the domain model for tax rules, jurisdictions, thresholds, and impositions.
• Build automation pipelines for filings, payments, and customer workflows.
• Use browser automation, scripting, and task queues to reduce manual work.
• Leverage LLMs and programmatic tools to enhance tax research and error handling.
• Collaborate across engineering, tax, and product teams.

Required qualifications

• 5–10+ years of professional software engineering experience, with a strong focus on backend development.
• Strong experience designing systems, services, and data models in complex domains.
• Proficiency in Python (FastAPI, Pydantic, pandas, duckdb), Postgres, and SQL.
• Infra runs on AWS.
• High attention to detail.
• Strong communication skills.
• Self-starter who can lead projects, make architectural calls, and execute independently.
• Ability to ship high-quality code fast and take ownership end-to-end.

Nice to have

• Experience working on automation-heavy systems, developer tools, or regulated workflows
• Experience with LLMs, scripting, or browser automation tools like Playwright

Benefits

• Company-covered benefits
• Meaningful equity

About the company

Taxwire is building an AI-native global sales tax engine and managed service for finance teams. They have raised approximately $25M in venture capital.