Backend Engineer

About the role

Fonzi is an AI recruiting company that connects backend engineers with 250+ pre‑vetted startups in NYC and San Francisco. After a 5‑minute application, the team learns what you’re building and what excites you, optimizes your profile, and shares it with hiring managers. Companies request interviews and submit competing salary bids directly to you. You only interview where you’re genuinely interested. The service is free, with an iMessage agent and human support available for scheduling and coordination.

Responsibilities

• Build backends powering agentic workflows across healthcare, fintech, legal and logistics
• Develop high‑throughput APIs and integrations with complex enterprise systems
• Work on payments, trading and real‑time financial infrastructure
• Create event‑driven architectures and data pipelines that scale with the business
• Develop LLM orchestration layers: tool calling, retrieval, job queues and eval hooks

Requirements

• 2‑8 years of experience building and scaling backend systems in production (APIs, services, databases, queues)
• Ideally includes experience at at least one high‑growth company
• Thrives in startup environments with ambiguous problems and small teams

Skills

• Strong in Python, Go, TypeScript, Java or Rust
• Deep experience with Postgres or similar databases
• Experience thinking in data models, distributed systems and failure modes
• Built backends for LLM‑powered products (orchestration, tool calling, retrieval, async jobs) or eager to do so

Pay

$175,000 to $290,000+ base salary depending on experience and role. Many positions include meaningful equity at pre‑seed through Series B stage companies.