Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Text.Json;
using System.Text.Json.Serialization;

public class JobApplication
{
    public string? CompanyName { get; set; }
    public string? RoleType { get; set; }
    public string? SalaryRange { get; set; }
    public string? BusinessType { get; set; }
    public bool Rejected { get; set; }
    public string? RejectionStage { get; set; }
    public DateTime ApplicationDate { get; set; }

    public virtual void DisplayInfo()
    {
        Console.WriteLine($"Company: {CompanyName}");
        Console.WriteLine($"Role Type: {RoleType}");
        Console.WriteLine($"Salary Range: {SalaryRange}");
        Console.WriteLine($"Business Type: {BusinessType}");
        Console.WriteLine($"Application Date: {ApplicationDate:yyyy-MM-dd}");
        Console.WriteLine($"Rejected: {(Rejected ? "Yes" : "No")}");

        if (Rejected)
            Console.WriteLine($"Rejection Stage: {RejectionStage}");
    }
}

public class RemoteJobApplication : JobApplication
{
    public string? WorkTimeZone { get; set; }

    public override void DisplayInfo()
    {
        base.DisplayInfo();
        Console.WriteLine($"Work Time Zone: {WorkTimeZone}\n");
    }
}

public class HybridJobApplication : JobApplication
{
    public int RemoteDays { get; set; }
    public int OnsiteDays { get; set; }
    public string? OfficeCity { get; set; }

    public override void DisplayInfo()
    {
        base.DisplayInfo();
        Console.WriteLine($"Remote Days: {RemoteDays}");
        Console.WriteLine($"Onsite Days: {OnsiteDays}");
        Console.WriteLine($"Office City: {OfficeCity}\n");
    }
}

public class OnsiteJobApplication : JobApplication
{
    public string? OfficeCity { get; set; }

    public override void DisplayInfo()
    {
        base.DisplayInfo();
        Console.WriteLine($"Office City: {OfficeCity}\n");
    }
}

public class ApplicationData
{
    public List<JsonElement> Applications { get; set; } = new();
}

class Program
{
    static void Main(string[] args)
    {
        string jsonPath = "applications.json";

        if (!File.Exists(jsonPath))
        {
            Console.WriteLine("JSON file not found.");
            return;
        }

        string json = File.ReadAllText(jsonPath);

        var options = new JsonSerializerOptions
        {
            PropertyNameCaseInsensitive = true
        };

        ApplicationData? data =
            JsonSerializer.Deserialize<ApplicationData>(json, options);

        if (data == null)
        {
            Console.WriteLine("Failed to deserialize JSON.");
            return;
        }

        Console.WriteLine("Job Applications:\n");

        foreach (var element in data.Applications)
        {
            string? roleValue = element.GetProperty("RoleType").GetString();
            string role = (roleValue ?? "onsite").ToLower();

            JobApplication? job;

            switch (role)
            {
                case "remote":
                    job = JsonSerializer.Deserialize<RemoteJobApplication>(element, options);
                    break;

                case "hybrid":
                    job = JsonSerializer.Deserialize<HybridJobApplication>(element, options);
                    break;

                default:
                    job = JsonSerializer.Deserialize<OnsiteJobApplication>(element, options);
                    break;
            }

            if (job != null)
                job.DisplayInfo();
        }
    }
}