Chief of Staff

We're looking for a Chief of Staff to serve as a force multiplier for the CEO. This is a part-time contract role (at least 20 hours per week, with flexibility on scheduling) designed for someone who can move fluidly between strategy and execution.

This isn't a "shadow the executive" role. You'll own real problems, make real decisions, and have direct impact on how the company scales. The position has a clear path to full‑time conversion, with a mutual evaluation at the 3‑month mark.

The ideal candidate has the horsepower of a top‑tier consultant, the scrappiness of an early startup employee, and the judgment to know when to ask questions versus when to just figure it out.

• Drive strategic planning:
  Own the quarterly planning process, track KPIs, and keep the company aligned on what matters.
• Fix what's broken:
  Identify bottlenecks in how we work, communicate, and ship. Implement solutions without waiting to be told.
• Lead cross‑functional projects:
  Take ownership of high‑priority initiatives that don't fit neatly into existing teams, whether that's analyzing a new market, coordinating a product launch, or preparing for a fundraise.
• Maximize the CEO's time:
  Manage priorities, prepare materials for board meetings and investor conversations, and handle external engagements.
• Support hiring and culture:
  Help recruit key roles and maintain a strong, unified culture across our SF and Tokyo teams.
• Build the information edge:
  Conduct research on competitors, market trends, and potential partnerships to inform decisions at the top.

• 2+ years in a high‑performance environment: top‑tier management consulting, investment banking, or Chief of Staff at a high‑growth startup.
• Track record of managing complex projects with multiple stakeholders and delivering under pressure.
• Exceptional communication skills. You can take messy information and turn it into a clear, concise narrative.
• Strong analytical and financial modeling skills.
• Native/Bilingual proficiency in English.

• Prior experience as a founder or early employee at a venture‑backed startup.

• Ownership:
  You treat this like your company. You don't wait for permission to solve problems.
• Adaptability:
  You're comfortable with ambiguity and can pivot between strategic, financial, and operational challenges without losing momentum.
• Discretion:
  You'll have access to sensitive information. You operate with integrity and keep confidences.

Job code

EX-18140E3D

Job type

Full-time

Location

Master (>10 yrs)

About the company

Jinba (YC W26)