Developer Builds AWS Bedrock Chatbot, Navigates Quota Limits and Prompt Caching

·68 views

A developer enrolled in the Formação AWS course by Henrylle Maia documented their hands-on journey learning Amazon Bedrock, AWS's fully managed service for accessing foundation AI models via API. Using Anthropic's Claude Sonnet 4.5, they built a ticket-selling chatbot that evolved from a single Bash script into an interactive, Node.js-based streaming application. Early testing was blocked by a throttling error tied to cross-region inference token quotas, which the developer resolved by manually requesting a quota increase through the AWS Service Quotas console. The developer noted that model quotas are not enabled by default and must be requested individually, a process they found poorly documented by AWS. The project concluded with the addition of prompt caching, which prevents the system prompt from being billed at full cost on every API call.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

Anthropic publishes IPO information page on its website

A link titled 'Anthropic IPO' was shared on Hacker News, pointing to an Anthropic web page at ipo.anthropic.com/us. The post gathered 65 points and 56 comments from the community. The linked page's contents were not available, so specifics such as timing, valuation, or offering details cannot be confirmed here. Please provide the article text to produce a full factual summary.

0 comments Read more at Hacker News

ProgrammingDEV Community ·

RupayaTools Offers Free, Sign-Up-Free Calculators Built for Indian Students and Job Seekers

A developer built RupayaTools, a free website of online tools designed for users in India. The site offers no-account, no-download utilities such as CGPA, SGPA, and percentage calculators aligned with CBSE and university grading. It also includes salary, EMI, and income-tax calculators, along with age calculators and unit converters. All tools run in the browser, so user data stays on the device, and the creator says the site is free with no paywall.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Stock Scorer Shows Negative Predictive Power in A-Share Backtest

A developer built a three-pillar scoring model for Chinese A-shares, combining technical, volume/price, and valuation signals to rank stocks and select the top 50. When audited against 70 rebalance dates and 587 stocks, the composite score showed a significantly negative rank information coefficient, meaning higher scores tended to precede lower returns. Two of the three pillars had negative IC values, and the only positive one came from the component labeled fundamental, which the author suspects is mislabeled. Decile analysis reinforced the finding, as the highest-scoring stocks underperformed the lowest-scoring ones over the five-day horizon. The author used the same shipped code in the audit rather than a rewritten version, and noted that the results are not perfectly monotonic and occurred during a falling market window.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Maruti Suzuki's quarterly margin figures differ by measure, not by error

Maruti Suzuki's July–September 2026 results drew different margin figures from different outlets, including 5.9%, 5.5%, and 8.9%. The variation comes from measuring profit at different levels: EBITDA counts only running costs, EBIT also deducts depreciation, and pre-tax margin further adjusts for interest and other income. Maruti's large cash holdings lift its other income, which is why its pre-tax margin sits above its EBIT margin. The author notes that Indian filings are not uniformly labelled, so the platform standardised on pre-tax profit divided by sales for all Indian stocks. The piece argues that data should always be shown alongside the name of the measure used.

0 comments Read more at DEV Community