Front-end developer expertise in maps and geospatial searches

We are looking for an experienced developer to create a simple yet efficient website for locating places on the map based on various geographical features. The website main objective is to provide an interactive way of finding locations that fit multiple criteria and connect as many data sources as possible. The website does not require any fancy graphics, but it does need a user-friendly interface and efficient functionality to support complex search queries for terrain features, elevations, and POIs. The search criteria will need to be easily modifiable, and the site should support data from multiple back-end sources such as Google Maps, OpenStreetMap and EU governmental land registries. Viewing should be optimized for 4K resolution e.g. for PC and large screen laptops. Each finalized query should be save-able and easy to retrieve via direct URL link.
The developer for this project should have the following skills:
• Strong experience with JavaScript and front-end technologies such as HTML, CSS, and jQuery
• Familiarity with map APIs such as Google Maps and OpenStreetMap
• Experience with geospatial search and queries
• Experience with creating user-friendly interfaces and efficient functionality
• Strong experience with Cartography programming
• Familiarity with GIS (Geographic Information Systems) software
• Familiarity with various EU governmental mapping sources such as Poland's GUGiK, geoportal.gov.pl, Greece's National Cadastre and Mapping Agency, and Croatia's Geodetic Institute.
The developer should be able to choose the appropriate libraries for the project and provide justification for their choice. Popular libraries for these tasks include:
• Leaflet.js, OpenLayers, Mapbox GL JS, Turf.js, etc.
The first implementation of this website will be a proof of concept, so clear and expandable code, as well as good documentation, are crucial. We would also like the application to be delivered in a ready-to-deploy Docker container. This is our first job listing on a gig-economy site and we are looking forward to working with a skilled developer to bring our projects to life.