Senior Backend Engineer

About 8fig:

At 8fig, we’re building the future of eCommerce funding. Our AI-powered platform analyzes real-time sales and banking data to offer personalized, flexible growth plans tailored to each business. By combining smart capital with powerful planning tools, we empower eCommerce businesses to scale sustainably and strategically - on their terms.

About the role:

We’re looking for a Senior Backend Engineer to help shape how we build software with AI. You’ll join a small team with the opportunity to shape both the product and how we build it. In this hands-on role, you’ll use Claude Code as your primary development tool and work closely with product and business teams to turn customer needs into reliable fintech solutions. You’ll combine engineering judgment with ownership of software that moves real money.

Main Responsibilities:

• Deliver features end to end using AI coding agents such as Claude Code, Codex or GitHub Copilot., from task breakdown and agent execution to reviewing, correcting and merging code.
• Review, refactor and harden agent-generated TypeScript to ensure correctness, readability and security.
• Write clear technical specifications for agents and verify generated code before submitting it for review.
• Build internal tools and workflows using the Claude Agent SDK and API, including Slack bots, data lookups and R&D operations automation.
• Define guardrails for agent access to production data, secrets and payment flows.
• Track agent output quality, rework rate and development cycle time, and share effective practices with the team.