Webpage Redesign for Sustainable Consulting Firm

I need an experienced web designer to update my consulting firm's webpage. The firm is based in Colombia and focuses on sustainability.

Key requirements:
- Improve design for a more professional and formal look
- Enhance user experience by improving navigation and accessibility

Ideal skills and experience:
- Proven portfolio in redesigning professional websites
- Strong understanding of UX principles, especially in navigation and accessibility
- Familiarity with sustainable businesses and eco-friendly design is a plus

Please provide samples of your previous work and a brief outline of your approach to this project.