For macOS · Built for Java · Powered by Claude
JIAA is a macOS prep app for Java & Spring developers. Practice real interview questions with instant, senior-level feedback, rehearse your take-home walkthrough against your own code, drill quiz-style questions, and get a full AI code review — all in one place.
$79 per 2 months or $349/year · subscription purchased inside the app
Does practising this way actually work?
I built JIAA to prepare for my own Java interviews — and it got me the job.
I refined it across more than a dozen real Java Developer interview loops, tuning the feedback until it reliably taught me how a senior would answer every technical question.
Install JIAA, pick a plan inside the app, and paste the license key that lands in your inbox.
Add your Anthropic API key. JIAA downloads a local Whisper model once, in minutes, so you can practise with spoken questions.
Fire real Java questions at it, study a senior-level answer, rehearse it out loud, then review your own code.
Whatever the interview process throws at you — rapid-fire Q&A, a take-home walkthrough, a code review, a live-coding task or a quiz platform — there's a mode to rehearse it.
Practise real Java & Spring questions and study a structured, senior-level model answer — then rehearse saying it out loud until it's second nature. Type a question or speak it; transcription runs locally.
Load your assignment repo with one URL and attach the task PDF. Rehearse the walkthrough with answers grounded in your actual code — citing exact locations like PaymentService.java:87.
Get concrete, severity-ranked issues on your Java/Spring code with before / after fixes side by side — so you learn what a reviewer would flag before they ask "what would you improve?".
Turn a task description into a complete, runnable solution to study — Spring Boot style that drops into a project, or a plain single-file main. Learn the shape of a clean answer.
Rehearse against Karat, DevSkiller, HackerRank and LeetCode-style questions and get the answer with the reasoning — and why the other options are wrong.
Answers, reviews, quiz solutions and your task repo live in one conversation, so every follow-up you practise is answered with the full picture in mind.
Whisper runs on your Mac. Your practice audio never leaves the machine — only transcribed text and the materials you attach are sent to Claude.
Java is the primary, fully supported language across every mode, with Kotlin in beta. Set the persona's tech stack and background so feedback matches your CV.
Clarify any answer, expand any topic deeper, or promote a practice answer into full live-coding code with one click.
One setting switches both the interface and the language of the generated feedback across English, Polish, French, and German.
Claude Sonnet 5 streams practice answers in seconds; deep reviews and code generation run on Claude Opus 5. A speed control trades a little depth for shorter waits.
An always-on-top window with adjustable opacity, built for a second monitor. Glance, read, rehearse.
One license, all five practice modes, full Java support (Kotlin beta), all updates.
$79/2 months
$349/year
≈ $29 per month
Subscriptions are purchased inside the app. Download JIAA, pick a plan, pay through the secure checkout — your license key arrives by email within a minute.
JIAA uses your own Anthropic API key for Claude. API usage is billed directly by Anthropic, so you keep full control over spend.
Before purchase, please review our Terms of Service, Refund Policy, and Privacy Policy.
A Mac (macOS 10.15 or newer) and your own Anthropic API key. On first launch JIAA downloads a local Whisper speech model (~466 MB, one time) so you can practise with spoken questions. The whole setup takes a few minutes.
Inside the app — there's no checkout on this site. Download JIAA, choose the 2-month or the yearly plan, and complete the payment in the secure Lemon Squeezy checkout. A license key arrives by email; paste it into the app and you're in. The key activates one Mac and can be released if you switch hardware.
Speech-to-text runs locally on your Mac using Whisper, so your practice audio never leaves the machine. Only the transcribed text — plus the code, PDFs or screenshots you explicitly attach — is sent to the Claude API to generate feedback.
JIAA is built for Java — the primary, fully supported language across every mode. Kotlin is available in beta. Repository import reads JVM projects, including pom.xml / Gradle / Spring configuration. You can set the persona's tech stack to match your experience, and use the app and generate feedback in English, Polish, French, or German.
The subscription unlocks the app. Claude API usage is billed separately by Anthropic through your own key — a typical practice session costs a fraction of a dollar in API calls, and you always see exactly what you spend.
Transcription is fully offline after the one-time model download. Generating feedback requires internet for the Claude API. If the license server is briefly unreachable, the app keeps working in offline grace mode.
Download JIAA, set it up in minutes, and start practising today.
Download for macOSmacOS 10.15+ · $79 per 2 months or $349/yr, purchased in-app
