Business Operations Manager
Castle
Operations
New York, NY, USA
Posted on Sep 3, 2025
Location: On-site 3–4 days/week in Brooklyn, NY
Compensation: Competitive base + equity
About Castle
Castle is a profitable, product-led Series A startup protecting users from account takeovers and abuse in real time. We power platforms like Canva, Atlassian, and Rockstar Games. Backed by Y Combinator, Index Ventures, and leading angels from Datadog, Stripe, and New Relic, we’re a 20-person team scaling fast with strong product–market fit.
Why this role matters
We’ve proven the market need and built a category-defining product. To scale into a market leader, we need financial and operational excellence.
This isn’t a Head of Ops track since we already have senior leadership in place but it is a role with real leverage and growth potential. You’ll run day-to-day operations across finance, legal, HR, and revops while building the processes and systems that keep the business running smoothly. And critically, you’ll partner closely with Alex, our Head of Automation, to strip away manual work and replace it with workflows that scale 10x without adding headcount 10x.
For the right person, this role is also a launchpad into senior finance. By managing vendor coordination, invoicing, renewals, reporting, and investor prep, you’ll gain the hands-on experience needed to grow into a finance leadership role as Castle scales.
What you’ll do
Compensation: Competitive base + equity
About Castle
Castle is a profitable, product-led Series A startup protecting users from account takeovers and abuse in real time. We power platforms like Canva, Atlassian, and Rockstar Games. Backed by Y Combinator, Index Ventures, and leading angels from Datadog, Stripe, and New Relic, we’re a 20-person team scaling fast with strong product–market fit.
Why this role matters
We’ve proven the market need and built a category-defining product. To scale into a market leader, we need financial and operational excellence.
This isn’t a Head of Ops track since we already have senior leadership in place but it is a role with real leverage and growth potential. You’ll run day-to-day operations across finance, legal, HR, and revops while building the processes and systems that keep the business running smoothly. And critically, you’ll partner closely with Alex, our Head of Automation, to strip away manual work and replace it with workflows that scale 10x without adding headcount 10x.
For the right person, this role is also a launchpad into senior finance. By managing vendor coordination, invoicing, renewals, reporting, and investor prep, you’ll gain the hands-on experience needed to grow into a finance leadership role as Castle scales.
What you’ll do
- Own finance operations: Vendor coordination, invoicing, renewals, expense tracking, reporting, and compliance.
- Support financial planning: Burn tracking, forecasting, investor prep, and fundraising materials.
- Automate & scale: Work directly with Alex (Head of Automation) to replace manual workflows with automated systems.
- Build systems & SOPs: Standardize and document recurring processes across the business.
- Cross-functional leverage: Cover key HR, legal, and revops workflows (payroll, benefits, contracts) to keep the company running smoothly.
- Drive efficiency: Identify bottlenecks early, propose solutions, and implement changes that free leadership for strategy.
- Analytical & structured: Strong with numbers, detail, and systems. Background in finance, business ops, consulting, or other structured roles.
- Execution-first mindset: Hands-on, reliable, precise.
- Tool-savvy: Comfortable with modern SaaS tools (Notion, Zapier, HRIS, CRM).
- Career-builder: You may be coming from finance, ops, or analyst role.. You want to break into startup operations with a finance lens, and grow into more responsibility as the company scales.
- Profitability + PMF: Real stability and upside.
- Impact: Small, elite team - your work will be felt immediately.
- Growth: Clear path to expand into finance leadership as the company scales.
- Equity: Ownership in a company building the future of online trust and security.
- Benefits: Unlimited PTO and sick leave, 401k with 6% matching, premium health insurance.