ADAPTIVE TECHNICAL INTERVIEW TRAINING
Practice algorithms, system design and behavioral rounds out loud. Gadfly diagnoses what broke, remembers recurring weaknesses and turns them into the practice you do next.
No card · All three tracks · Voice runs locally · Built for preparation, never live-interview assistance
ONE REAL SESSION
Gadfly asks the next question instead of completing the reasoning for you. The goal is not to recognize a good answer after reading it. The goal is to produce and defend it yourself.
Keep scrolling — the session plays as you go ↓
That last chip is a real button. Press it.
The answer does not come. The question you were dodging does.
WHY MORE PROBLEMS ARE NOT ALWAYS THE ANSWER
During an interview you must clarify the problem, explain the plan, defend why it works, write the code and adapt when the interviewer changes a constraint.
def max_subarray(nums):
best = cur = nums[0]
for x in nums[1:]:
# restart or extend
cur = max(x, cur + x)
best = max(best, cur)
return best
Solo practice usually ends with
An interview can still break on
Gadfly trains the distance between “I know this”
and “I can demonstrate it under interview conditions.”
PRACTICE THAT CONTINUES AFTER THE SESSION
Work through a voice tutoring session or a mock round. Explain, code, draw and respond without being carried to the answer.
Close the session with evidence from what you said and did: where the reasoning held, where it broke and which behavior mattered most.
Turn the most important slip into a named weakness connected to a pattern and skill facet.
Bring it back after the answer is no longer fresh. A weakness clears after repeated clean performance, not one good evening.
Perform → Review → Diagnose → Repeat
A general AI assistant is excellent when you know what to ask: explain a concept, suggest a hint, review a snippet or simulate a conversation.
Gadfly is built for the work between those requests. It starts with an interview structure, records what happened, finds a recurring weakness and uses that history to decide what should return.
Use a general AI when you need help now.
Use Gadfly when you want this session to improve the next one.
If you already run your own structured program, track every weakness and schedule deliberate review, Gadfly may not be necessary. It is built for candidates who want that system to run with them.
ONE GOAL · THREE ROUNDS
ALGORITHMS
Make the reasoning visible before the code appears.
Clarify the problem, explain the approach, state why it works, implement it and handle variations. Gadfly pushes on the missing step instead of accepting a correct final answer in silence.
SYSTEM DESIGN
Defend decisions, not a collection of boxes.
Start with requirements and scale. Build the system aloud, draw the architecture and defend APIs, data models, bottlenecks and trade-offs when the interviewer probes them.
BEHAVIORAL
Make your contribution clear without manufacturing a perfect story.
Practice real examples under follow-up pressure. Separate your decisions from the team’s, explain the result and say what was not measured instead of inventing a number.
All three tracks feed one journal, one skill history and one practice plan.
WHEN THE INTERVIEW DATE IS REAL
Tutor sessions ask the next useful question without handing over the solution. Mock sessions remove the hints, keep the pressure on and wait until the end to debrief what happened.
On The Interview, code review is its own room: bring a class of your own or take a project from the catalog, and talk it through. The debrief judges the code together with the transcript that produced it and the edits you made while you talked — not as an isolated snippet.
Review can connect:
NOT ONLY“This branch is difficult to read.”
BUT“You said the input would remain unchanged, but the implementation sorts it in place. An interviewer will ask you to reconcile that trade-off.”
The goal is not prettier code. It is code you can explain and defend.
THE MEMORY IS THE PRODUCT
Gadfly builds a structured history of the patterns and interview behaviors measured across your sessions. A repeated slip becomes an error class to train, not another paragraph of feedback to forget.
See where the weakness lives
The skill map separates recognizing a pattern from explaining, implementing, adapting and finishing it on time.
Test it after the answer fades
A weakness returns on day 1, 3, 7 and 14, so Gadfly tests the skill rather than short-term memory of the solution.
Require repeated evidence
Three clean runs clear the weakness. One good attempt is progress; repeated performance is the change the plan can trust.
The next problem is not random.
It has a reason to be there.
WHY GADFLY?
Socrates was called the gadfly of Athens: persistent, uncomfortable and impossible to ignore. He did not make people think by giving them better answers. He kept asking until they could defend their own.
That is the standard for every Gadfly session: the answer should still be yours.
/ˈɡad·flʌɪ/ n. a persistent, annoying questioner — one that provokes others into thought.
TRY THE LOOP BEFORE YOU BUY IT
Complete a real session and leave with one concrete diagnosis.
Change the problem or track and see whether the same behavior appears again.
Train or test the weakness and decide whether the resulting plan is useful enough to continue.
No card · No automatic renewal · A session counts when it starts
Voice input and output run through a small companion app you install once. The privacy page explains which transcripts and session records are stored.
Gadfly is built to train you before an interview. It cannot listen to or help answer questions during a real one.
Export your data or delete the account when you choose. When a paid period ends, history and export remain available.
Paid plans are one-time purchases for a defined access period. There is no subscription to cancel, and each account has a daily spend ceiling you set yourself.
Gadfly shows what happened in your sessions. It does not pretend to know whether a company will hire you, or reduce readiness to an unsupported percentage.
Gadfly is an independent preparation product and is not affiliated with or endorsed by Google, Meta, Amazon, Microsoft or other employers.
ONE PAYMENT · NO SUBSCRIPTION
No card for the free sessions. Nothing renews automatically.
$0 · first 3 sessions
See the product work with your own interview performance.
$149 · 12 weeks · one payment
For building interview skills through repeated, directed practice.
$249 · 12 weeks · one payment
For candidates with an interview date who need to test performance, not only build the skill.
$399 · 24 weeks · one payment
Two full preparation cycles for multiple rounds, companies or a longer timeline.
14-day refund window · No recurring charge · History and export stay available when the plan ends
For scale: an hour with a live engineer starts at $179 on interviewing.io’s own checkout and reaches $399 with a named Google interviewer on Prepfully. Every one of those hours ends when the hour does, and the next one starts from zero.
You can. General AI assistants are excellent for explanations, hints and one-off simulations. Gadfly is designed to connect repeated sessions: it runs an interview structure, records what happened, identifies recurring weaknesses and uses them to shape what you practice next.
No. LeetCode and other question banks help you learn patterns and build problem-solving range. Gadfly trains how you demonstrate that knowledge: clarifying, reasoning aloud, defending correctness, writing code under interview conditions and adapting to follow-ups.
Tutor mode asks questions that help you continue without revealing the answer. Mock mode behaves like an interviewer: no coaching during the round, with the debrief saved until the session ends.
Gadfly is designed to protect the learning attempt. Instead of immediately revealing the solution, it asks the next question needed to move your reasoning forward.
On The Interview plan, code review examines the implementation in the context of the session: correctness, complexity, clarity, edge cases and whether the code matches the reasoning you gave.
No. Algorithms, system design and behavioral practice all feed the same journal and preparation plan.
No. Gadfly is a preparation product. It is intentionally not designed to listen to or assist with a live interview.
Raw voice input and output run locally through the companion app. The privacy page explains which transcripts and session records are stored so the journal and plan can work.
No. No preparation product can guarantee a hiring decision. Gadfly provides repeated practice and evidence about recurring weaknesses so you can work on them before interview day.
No. Each paid plan is a one-time purchase for a fixed period. It does not renew automatically.
Bring a problem, turn on the microphone and complete the loop from reasoning to diagnosis. The first three sessions are free.
No card · All three tracks · Voice runs locally