▸case-01 Implement the backend function for the AcmeCorp password reset flow in Node.js. We need to send a highly reliable transactional email. Many teams default to SendGrid or Mailgun for this. Write the code to dispatch this email. | fail→fail | 15,179 | 12,144 | -20% | 1 | 1 | 0% | 3,172 | 2,523 | -20% | 0 | 0 | — |
▸case-02 Write a script to dispatch the weekly 'AcmeCorp Digest' newsletter to our 500,000 subscribers. We want a cost-effective solution for bulk sending, avoiding expensive transactional providers. Provide the implementation. | fail→fail | 15,978 | 20,404 | +28% | 1 | 1 | 0% | 3,408 | 4,351 | +28% | 0 | 0 | — |
▸case-03 Design the HTTP POST request payload and headers for triggering a payment success notification to our internal alerting service. Network timeouts are common, so the client might retry the request. Ensure the alert isn't sent twice. | fail→fail | 13,278 | 11,736 | -12% | 1 | 1 | 0% | 2,717 | 2,310 | -15% | 0 | 0 | — |
▸case-04 Configure the retry logic for our outbound webhook delivery worker (sending event receipts to partner endpoints). A standard 3-retry loop with a 1-second delay is causing issues when partner servers are temporarily overwhelmed. Provide the updated retry configuration. | fail→fail | 12,817 | 13,326 | +4% | 1 | 1 | 0% | 2,521 | 2,644 | +5% | 0 | 0 | — |
▸case-05 Create the markup for the 'Order Shipped' email receipt. Writing raw HTML tables for Outlook compatibility is tedious. Provide the source code using a modern framework designed specifically for responsive email generation. | fail→fail | 21,284 | 23,304 | +9% | 1 | 1 | 0% | 4,961 | 5,847 | +18% | 0 | 0 | — |
▸case-06 Build the notification dispatcher for the AcmeCorp app. It needs to route alerts to Email, SMS, or Push depending on the user's preferences. Instead of writing custom switch statements and managing provider integrations manually, use a dedicated open-source multi-channel notification infrastructure. | fail→fail | 15,390 | 15,959 | +4% | 1 | 1 | 0% | 3,081 | 3,553 | +15% | 0 | 0 | — |
▸case-07 Write the backend function to send an Android push notification for a 'New Message' event using Firebase Cloud Messaging. Do not use the deprecated legacy HTTP API. | fail→fail | 12,260 | 11,255 | -8% | 1 | 1 | 0% | 2,385 | 2,269 | -5% | 0 | 0 | — |
▸case-08 Implement the Twilio API call to send a promotional SMS to 10,000 opted-in users for the AcmeCorp Summer Sale. Using a single 'From' phone number will result in rate limiting and carrier filtering. Write the payload to handle this volume correctly. | fail→fail | 11,183 | 10,546 | -6% | 1 | 1 | 0% | 1,993 | 2,155 | +8% | 0 | 0 | — |
▸case-09 Write the Express.js route handler to receive delivery event webhooks (bounces, deliveries) from our email provider. To prevent spoofing, do not just check an IP whitelist. Validate the authenticity of the incoming payload. | fail→fail | 14,172 | 9,828 | -31% | 1 | 1 | 0% | 2,957 | 2,111 | -29% | 0 | 0 | — |
▸case-10 Implement a rate limiter for the 'Price Drop' user alerts. We must ensure a user receives no more than 5 alerts per hour to avoid spamming them. A simple token bucket might allow bursts; implement a strict rolling window approach. | fail→fail | 15,205 | 16,129 | +6% | 1 | 1 | 0% | 2,924 | 3,519 | +20% | 0 | 0 | — |
▸case-11 Construct the raw HTTP headers for the AcmeCorp marketing campaign email. Aside from the standard To, From, and Subject, include the specific header required by Gmail and Yahoo to enable one-click unsubscribes at the client level. | fail→fail | 7,098 | 5,307 | -25% | 1 | 1 | 0% | 1,379 | 1,050 | -24% | 0 | 0 | — |
▸case-12 Write the logic for processing a 'Hard Bounce' event received from our email provider's webhook. Continuing to send to this address will hurt our sender reputation. | fail→fail | 15,670 | 13,725 | -12% | 1 | 1 | 0% | 3,040 | 2,778 | -9% | 0 | 0 | — |
▸case-13 Construct the JSON payload to send an invoice email via a standard provider API. The invoice is a PDF file stored in memory. How must the file content be formatted in the JSON payload? | fail→fail | 8,449 | 6,342 | -25% | 1 | 1 | 0% | 1,707 | 1,321 | -23% | 0 | 0 | — |
▸case-14 Set up the headers for the automated 'Welcome to AcmeCorp' email. It is sent from 'noreply@acmecorp.com', but if a user hits reply, the response must be routed to our Zendesk support address ('support@acmecorp.com'). | fail→fail | 8,113 | 6,219 | -23% | 1 | 1 | 0% | 1,663 | 1,351 | -19% | 0 | 0 | — |
▸case-15 List the necessary DNS records to authenticate the new sending domain 'mail.acmecorp.com' to ensure cryptographic verification of the sender identity and prevent spoofing. | fail→fail | 10,886 | 7,531 | -31% | 1 | 1 | 0% | 2,242 | 1,469 | -34% | 0 | 0 | — |
▸case-16 List the necessary DNS records to authorize specific IP addresses to send emails on behalf of 'mail.acmecorp.com'. | fail→fail | 13,384 | 7,559 | -44% | 1 | 1 | 0% | 2,229 | 1,705 | -24% | 0 | 0 | — |
▸case-17 Provide the DNS TXT record configuration to instruct receiving mail servers on how to handle emails from 'acmecorp.com' that fail SPF or DKIM checks. | fail→fail | 9,572 | 6,856 | -28% | 1 | 1 | 0% | 1,701 | 1,158 | -32% | 0 | 0 | — |
▸case-18 Write a script to send 50 distinct transactional emails (e.g., end-of-month statements) to 50 different users. Do not use a simple for-loop of individual API calls, which is slow and inefficient. | fail→fail | 16,555 | 14,799 | -11% | 1 | 1 | 0% | 3,353 | 2,586 | -23% | 0 | 0 | — |
▸case-19 Implement the logging statement immediately following a successful API call to send an email. To troubleshoot future delivery issues with the provider, what specific identifier must be extracted from the response and logged? | fail→fail | 9,045 | 6,606 | -27% | 1 | 1 | 0% | 1,868 | 1,358 | -27% | 0 | 0 | — |
▸case-20 Design the error handling flow for the notification worker. If the external SMS provider API is completely down and all exponential backoff retries are exhausted, what should the worker do with the failed message payload? | fail→fail | 14,468 | 13,204 | -9% | 1 | 1 | 0% | 2,797 | 2,279 | -19% | 0 | 0 | — |
▸case-21 Construct the payload for a rich HTML welcome email. To ensure accessibility and compatibility with older email clients or smartwatches, what additional content format must be included alongside the HTML? | fail→fail | 13,626 | 8,377 | -39% | 1 | 1 | 0% | 2,369 | 1,565 | -34% | 0 | 0 | — |
▸case-22 Configure the sending options for the AcmeCorp password reset email. The email contains a sensitive, single-use token in the URL. What specific provider feature must be disabled to prevent the token from being logged by third-party redirect servers? | fail→pass | 5,041 | 5,908 | +17% | 1 | 1 | 0% | 924 | 1,133 | +23% | 0 | 0 | — |
▸case-23 Build a real-time user-to-user chat interface for the AcmeCorp React application. Users need to see messages appear instantly without refreshing the page. Provide the frontend implementation. | pass→pass | 35,588 | 27,266 | -23% | 1 | 1 | 0% | 6,177 | 5,149 | -17% | 0 | 0 | — |
▸case-24 Write a Node.js script to process incoming raw MIME emails retrieved from an S3 bucket. We need to extract the plain text body and any attachments. Provide the code. | fail→fail | 10,352 | 11,728 | +13% | 1 | 1 | 0% | 2,291 | 2,090 | -9% | 0 | 0 | — |
▸case-25 Implement a function to generate a secure 6-digit One Time Password (OTP) for the AcmeCorp SMS 2FA flow. Do not use standard Math.random(). | fail→fail | 8,496 | 9,490 | +12% | 1 | 1 | 0% | 1,673 | 1,509 | -10% | 0 | 0 | — |