The latest articles on DEV Community by Aakash Das (@aakash_das). https://dev.to/aakash_das https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4036028%2Fcc547ab1-4dc9-4d04-af0f-61d2ed0e0b86.jpg https://dev.to/aakash_das en Aakash Das Sun, 19 Jul 2026 07:01:00 +0000 https://dev.to/aakash_das/building-an-ai-resume-scorer-with-claude-aws-bedrock-architecture-and-lessons-learned-4f7o https://dev.to/aakash_das/building-an-ai-resume-scorer-with-claude-aws-bedrock-architecture-and-lessons-learned-4f7o <p>Most résumés never reach a human recruiter. ATS software filters them out silently, with zero feedback to the applicant.</p> <p>That's the problem <a href="https://www.scoraxis.com/" rel="noopener noreferrer">ScorAxis</a> solves.</p> <h2> What it does </h2> <p>Upload a PDF → get a 0–100 ATS compatibility score with specific issues flagged and actionable fixes.</p> <h2> Stack </h2> <ul> <li> <strong>Backend:</strong> FastAPI + AWS ECS Fargate + RDS Postgres</li> <li> <strong>Frontend:</strong> Next.js 15 + Vercel + Clerk auth</li> <li> <strong>AI:</strong> Claude Haiku 4.5 (parsing) + Sonnet 4.6 (checks) via AWS Bedrock</li> <li> <strong>Jobs:</strong> Inngest for background processing</li> </ul> <h2> Scoring — two halves </h2> <p><strong>Deterministic (0–70)</strong> — pure Python, no AI:<br> contact info, sections, word count, bullets, date consistency, layout density</p> <p><strong>LLM (0–30)</strong> — Claude Sonnet via tool use:<br> action verbs, quantified impact, keyword coverage, tense, buzzwords</p> <h2> The interesting part — graceful degradation </h2> <p>If Sonnet is unavailable, the upload never fails.<br> The system persists a deterministic-only score with a "Limited Mode" banner. The user always gets something useful.</p> <p>Forced tool_choice made structured JSON output rock solid — almost zero validation failures in production.</p> <h2> Lessons </h2> <ul> <li>Separate deterministic from AI logic from day one</li> <li>Forced tool use &gt; prompt engineering for structured output</li> <li>Ship early — real feedback beats internal tuning</li> </ul> <p>Live at <a href="https://www.scoraxis.com/" rel="noopener noreferrer">scoraxis.com</a> — happy to<br> answer questions about the architecture below.</p> ai architecture aws career