Staff Software Engineer

4 days ago

New York, NY, United States Arc Full time
Location: Prefer Onsite NYC. Open to exceptional candidates in SF
Employment Type: Full-Time
Hiring Manager: Andrew Rosen, Head of Engineering

About Arc

Arc is building the first AI-native business cash management platform. We empower high-growth companies to manage, analyze, and act on their financial data through a unified cash management, treasury, and debt-financing platform-powered by AI.

Founded in 2021, Arc is backed by world-class investors (Series A), supports thousands of technology companies as customers, and manages billions of dollars in transaction volume. With offices in NYC and SF, we operate on a Monday-Wednesday in-office model (Thu-Fri optional in-office or WFH).

We're at an inflection point.

Large enough to matter; small enough to innovate.

The Role

This is a critical role, with expectations unleveled for broader architectural influence, technical leadership, and impact on Arc's evolving AI-native financial platform. As a Staff Software Engineer, you will own major components across our cash management, treasury, and AI automation systems-designing for reliability, scale, safety, and speed.

You'll work directly with Arc's Head of Engineering, and partner cross-functionally with leadership, product, data, and security to build the intelligence layer that powers business finance.

What You'll Do
Lead architecture and development of Arc's finance and AI systems
  • Own end-to-end design for major platform surfaces across cash management, treasury, and debt marketplace.
  • Contribute to Arc's AI agent, Archie, evolving from insights → supervised actions → controlled execution inside the bank.
Build mission-critical, high-reliability financial infrastructure
  • Scale our banking rails, KYC/KYB onboarding flows, ledgering systems, and fund movement pipelines.
  • Deeply consider safety, audibility, and security in every decision.
Drive Arc's automation roadmap
  • Automate lending workflows (target: 90% automation).
  • Power the AI CFO agent's ability to take actions, not just deliver insights.
Own strategic technical decisions
  • Identify and implement "fast moving water" opportunities.
  • Influence product direction with a strong owner mindset.
  • Mentor engineers and elevate engineering quality across the team.
What You'll Achieve
In 30 Days
  • Ramp fully into Arc's stack, taking ownership of a meaningful component.
  • Understand financial integrations, ledger models, and AI intelligence architecture.
In 60 Days
  • Lead development of a significant feature or system.
  • Improve reliability or performance of a core workflow.
In 90 Days
  • Drive a high-impact roadmap initiative across AI, cash management, or lending automation.
  • Serve as go-to technical lead for a functional area.
Ideal Background
Required
  • 5-7+ years of software engineering experience (strong IC track record).
  • Startup experience + exposure to at least one mid-size or large engineering environment.
  • Strong system design fundamentals and experience scaling distributed systems.
  • Solid understanding of LLMs, agents, embeddings, or vectorized workflows.
Preferred (Nice-to-Have)
  • Background in fintech, treasury, payments, or regulated environments.
  • Experience with document understanding, orchestration agents, or AI feature development.
  • Familiarity with high-security data systems, audibility, or compliance-heavy infra.
Attributes That Make You Successful Here
  • Owner mentality-operates with autonomy, sees problems end-to-end.
  • Customer-obsessed-builds with empathy for end users.
  • Thinks big-comfortable in ambiguity, innovates quickly.
  • Bias toward action and clarity.
  • High accountability and technical standards.
Why Join Arc Now?
  • Category creation: You'll build the first AI platform for business cash business management.
  • Massive market: Banking + treasury + AI automation is a multi-trillion-dollar opportunity.
  • PMF already secured: Arc has elite customers, strong economics, and hyper-growth.
  • High impact: Staff engineers here are foundational-this role moves the roadmap.
  • Lean, elite team: Work with exceptional builders; every engineer is high-leverage.

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