Should we build dark mode?
Last updated: February 6, 2026
Quick Overview
Your team is considering building onboarding flow. How would you evaluate this decision?
Jane Street
February 6, 202635
5
4,114 solved
Your team is considering building onboarding flow. How would you evaluate this decision?
Product questions at Jane Street test your ability to think like a product leader. This Technical Screen question evaluates how you balance user needs, business goals, and technical constraints when making product decisions.
What the Interviewer Expects
- Apply a structured framework for product thinking (user, problem, solution, metrics)
- Segment users and identify differentiated needs
- Prioritize features using a clear framework (RICE, ICE, impact vs effort)
- Define comprehensive success metrics across the user funnel
- Consider competitive dynamics and market positioning
Key Topics to Cover
How to Approach This
- Start with the user. Who are they, what problem do they have, and what is their current workaround?
- Use a prioritization framework: impact vs effort, RICE scoring, or ICE scoring.
- Define success metrics using the AARRR framework: Acquisition, Activation, Retention, Revenue, Referral.
- Consider second-order effects. A feature might boost short-term engagement but hurt long-term retention.
Possible Follow-up Questions
- What would you do if usage data contradicts user feedback?
- What competitive response would you expect and how would you prepare?
- How would you validate this idea before committing engineering resources?
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Problem Framing
To determine whether Jane Street should build a dark mode feature, we first need to scope the problem by understanding the specific user needs related to visual preferences and environmental condition...
User & Market Context
The primary users of Jane Street's trading platform are quantitative traders and analysts who spend long hours working with data and charts. For these users, a dark mode can enhance readability and re...
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