Challenge yourself,
because you know
they will.
Curveball helps candidates build confidence through realistic interview simulations designed around communication, adaptability, leadership, and real-world decision making.
Free tier · No credit card · Up to 3 saved sessions
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Candidate
Sandbox Session
Current question · Stakeholder Management
“Tell me about a time you had to influence a decision without direct authority.”
Behavioral Signals
Session in progress…Observations are derived from response content and communication patterns. Not a score. Not a label. A signal.
The Problem
The hiring process wasn't designed to understand people.
It was designed to filter applications at scale. The tools haven't kept up with the problem they were meant to solve.
Resumes are optimized for keywords
The best candidates spend more time formatting than thinking. The filter is the wrong filter.
AI-generated resumes are indistinguishable
When everyone can produce a polished resume instantly, the resume stops signaling anything meaningful.
Great candidates are overlooked
Communication, judgment, and adaptability rarely survive the ATS. They show up in conversation — if you get one.
Interviews reward rehearsal, not readiness
Scripted answers to predictable questions don't reveal how someone thinks. They reveal how well they prepared the script.
What Curveball Measures
Competencies that don't fit on a resume.
Every Curveball session is designed around behavioral competencies — observable signals that reveal how someone actually thinks, leads, and communicates.
Communication
Clarity, structure, and audience awareness under pressure.
Adaptability
Operating effectively when direction, context, or information changes.
Leadership
Driving outcomes through people — with or without authority.
Collaboration
Working across functions, levels, and disagreements toward shared goals.
Stakeholder Management
Identifying, aligning, and managing competing expectations.
Decision Making
Evaluating tradeoffs and committing to a path — especially under uncertainty.
Plus Accountability, Conflict Resolution, Customer Orientation, Strategic Thinking, Self Awareness, Resilience, and Ethical Judgment.
The Difficulty Model
Practice at game speed.
Curveball isn't designed to trick you. It's designed to prepare you. Interview stress isn't eliminated by knowing the answers — it's reduced by having been in the pressure before.
Warmup
Accessible entry point. Low stakes, clear framing. Build your baseline.
Standard
Real interview difficulty. Requires depth, specificity, and structure.
Challenging
Nuanced scenarios, tradeoffs, and competing priorities. No easy answers.
Curveball
Ambiguity, pressure, and incomplete information. Simulates real interview stakes.
Game Speed
Maximum pressure. Time constraints, unexpected pivots, competing stakeholder needs. This is what it actually feels like.
Choose your difficulty. Change it anytime.
For Candidates
More prepared. More confident.
Less invisible.
The interview is the opportunity. Curveball is how you stop leaving it to chance — and start showing up as someone who's been here before.
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Build genuine confidence
Repetition in realistic conditions builds the kind of confidence that holds up in the actual interview.
Practice difficult scenarios
Ethical dilemmas. Stakeholder conflict. Executive misalignment. The questions that actually separate candidates.
Improve how you communicate
Real-time transcription, filler word analysis, and behavioral signal feedback — after every session.
Identify your blind spots
You don't know what you're missing until you see a pattern across multiple responses. Curveball shows you the pattern.
Stand out beyond your resume
Your judgment, leadership, and communication don't fit in a PDF. Curveball gives them a place to live.
Practice on your own terms
No account required to start. Free tier available. Your sessions belong to you.
For Hirers
Better signal. Structured evaluation.
Curveball gives your team a consistent behavioral framework before the first phone screen — so your conversations are better informed from the start.
Better candidate signal
Behavioral competency data before the first phone screen. Spend time on candidates who can demonstrate readiness.
Structured evaluation
Consistent competency framework across every candidate, every role, every hiring manager.
Reduced interview inconsistency
When all candidates are evaluated against the same behavioral dimensions, your hiring decisions improve.
Better hiring conversations
Use candidate responses as a starting point, not a replacement. Arrive at interviews with context.
For Partners
Integrations are coming.
We are building toward integrations with recruiting platforms, applicant tracking systems, and hiring ecosystem tools. If you represent a platform and are interested in exploring how Curveball behavioral data could complement your existing workflow, we'd like to hear from you.
No specific integrations are announced at this time. We are focused on building a strong foundational product before expanding the ecosystem.
Ready?
The interview is coming.
Practice like it is.
Free sandbox access. No account required to start. No algorithm between you and a real interview question.
Start Sandbox Practice →Free · No credit card · Up to 3 saved sessions on the free tier