This content originally appeared on DEV Community and was authored by Anton Abyzov
The Problem
I was stuck in resume hell.
50 applications sent. 90 minutes per resume. Manually matching keywords. Tweaking bullet points. Checking ATS compatibility.
Result? 3 interviews. 12% response rate.
There had to be a better way.
The Solution
I built an AI agent using Claude Sonnet 4.5 (released Sept 29, 2025 - 77.2% SWE-bench Verified).
The agent:
- Reads any job description
- Extracts keywords, requirements, tech stack
- Searches my experience database
- Generates a perfectly tailored resume
- 2 minutes. 90%+ keyword match.
The Results
Before:
- 3 interviews from 50 applications
- 75 hours of manual work
- 12% response rate
After:
- 18 interviews from 50 applications
- 2.5 hours total
- 44% response rate
6x more interviews. 72 hours saved.
How It Works
1. Experience Database
Create a Markdown file with YOUR achievements:
## Current Role: Senior Backend Engineer @ TechCorp
**Period:** January 2023 - Present
**Tech Stack:** Node.js, TypeScript, PostgreSQL, AWS
**Scale:** 10M+ requests per day
### Key Achievements:
- **Performance:** Reduced API latency by 28% through Redis caching
- **Migration:** Led microservices migration, improved deployment speed by 45%
- **Events:** Implemented Kafka streaming handling 500K+ events/day
- **Mentorship:** Mentored 2 junior engineers to mid-level in 8 months
2. The Agent Configuration
Create resume-fine-tuner.md:
# Resume Fine-Tuner Agent
## Model
claude-sonnet-4-5-20250929
## Tools
- Read: Analyze job descriptions
- Write: Generate resumes
- Grep: Search for keywords
- Bash: Format conversions
## Instructions
You are an expert resume writer powered by Claude Sonnet 4.5.
**Workflow:**
1. READ job description thoroughly
2. EXTRACT key requirements and keywords
3. SEARCH experience database for matches
4. PRIORITIZE most relevant achievements
5. WRITE tailored resume with 90%+ keyword match
**Rules:**
- NEVER fabricate companies or achievements
- Use realistic metrics (20-40% improvements)
- Maintain authenticity
- Optimize for ATS systems
3. Run the Agent
# Install Claude Desktop
# https://claude.ai/download
# Start Claude Code
claude
# Call the agent
@resume-fine-tuner
Create a tailored resume for this Senior Backend Engineer position:
Read job description: job-descriptions/clickup-senior-backend.md
Use experience: experience-db/software-engineer.md
Output: outputs/resume-clickup-2025-10-01.md
Emphasize:
- Node.js and TypeScript
- High-throughput systems
- SQL optimization
- AWS expertise
Ensure 90%+ keyword match.
4. The Agent Generates Your Resume
2 minutes later, you have:
- Professional summary with job-specific keywords
- Experience section highlighting relevant projects
- Skills perfectly matched to requirements
- ATS-optimized formatting
- 90%+ keyword coverage
5. Export to Any Format
# Install Pandoc
brew install pandoc # Mac
# Or use online: dillinger.io, stackedit.io
# Convert to Word
pandoc resume.md -o resume.docx
# Convert to PDF
pandoc resume.md -o resume.pdf
Why Claude Sonnet 4.5?
Could you use ChatGPT or Gemini? Yes.
But Claude Sonnet 4.5 offers:
- 77.2% SWE-bench Verified (best in the world)
- Better instruction following (less hallucination)
- Superior keyword matching (contextual, not stuffing)
- Same price as old Sonnet 4 ($3/$15 per million tokens)
For complex multi-step tasks like resume optimization, Claude Sonnet 4.5 is smoother and more reliable.
Works for Any Profession
The system works for:
- Software engineers ✅
- Marketing managers ✅
- Real estate agents ✅
- Finance professionals ✅
- Healthcare workers ✅
- Any profession ✅
Just customize your experience database. Same principle.
Next Level: Full Automation
Want to go further?
- n8n workflows to auto-send resumes
- Claude Code agents to auto-apply to jobs
- Automation to auto-follow-up with recruiters
The agent creates content. Automation handles delivery. You review offers.
The Bigger Picture
You won't be replaced by AI.
You'll be replaced by someone who uses AI better than you.
Think about it:
- They apply to 50 jobs in 3 hours
- You apply to 10 jobs in 15 hours
- They get 20 interviews
- You get 2-3
Same experience. Same qualifications. Different tools.
Get Started Today
Everything is open source and free:
🎥 Full Video Tutorial (12 min):
https://youtu.be/RfwZSRRRtmY
📂 GitHub Repository (All Code + Templates):
https://github.com/anton-abyzov/ai-power
📖 Web Documentation:
https://anton-abyzov.github.io/ai-power/
Tech Stack
- AI Model: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929)
- Agent Framework: Claude Code
- Format Conversion: Pandoc
- Languages: Markdown, Bash
- Platform: Cross-platform (Mac, Windows, Linux)
Key Takeaways
- Content stays the same - Your achievements are authentic
- Delivery changes - Keywords match each job
- Automation wins - 2 minutes vs 90 minutes
- Results prove it - 6x more interviews
- Anyone can build this - 12-minute tutorial
What's Next?
I'm documenting my journey building AI-powered automation tools.
Next episode: Full job application automation (auto-apply, auto-follow-up, auto-schedule interviews).
Subscribe on YouTube or star the GitHub repo to follow along.
Questions? Drop them in the comments. I'll answer every one.
Built this and got results? Comment below - I'd love to hear your success story!
This content originally appeared on DEV Community and was authored by Anton Abyzov
Anton Abyzov | Sciencx (2025-10-01T18:29:43+00:00) I Built an AI Resume Agent That 6x’d My Interview Rate (Claude Sonnet 4.5). Retrieved from https://www.scien.cx/2025/10/01/i-built-an-ai-resume-agent-that-6xd-my-interview-rate-claude-sonnet-4-5/
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