Import Cost Calculator Website Development with SEO

I want to develop a website similar to importcostcalc.com. The website will allow users to calculate import costs including duties, taxes, shipping, and other charges.

Key Features Required:

Interactive import cost calculator (dynamic inputs & results)
Country-wise tax/duty logic
Product category selection
Real-time calculation results
Clean, user-friendly UI/UX
Mobile responsive design
Fast loading speed

SEO Requirements:

On-page SEO optimization (meta tags, headings, schema)
Keyword research related to import/export, duties, shipping costs
SEO-friendly URL structure
Blog section for content marketing
Basic technical SEO (site speed, sitemap, indexing)

Tech Preferences (optional):

Open to suggestions (WordPress / Custom / React etc.)

Deliverables:

Fully functional website
Admin panel (to update rates, rules, content)
SEO-optimized pages
Documentation

Timeline:
2–4 weeks (flexible based on scope)

Budget:
Open for proposals

Additional Notes:
Please share similar projects/portfolio and approach for both development and SEO