You can use a service like quicktype to create Codable classes. As a starting point you should read more about the Codable Protocol
You can use the following code to parse this JSON:
import Foundation
// MARK: - Root
struct Root: Codable {
    let status: Int
    let data: [Datum]
    let message: String
}
// MARK: - Datum
struct Datum: Codable {
    let month: String
    let jobs: [Job]
}
// MARK: - Job
struct Job: Codable {
    let jobID: Int
    let jobTitle, jobDesc, jobDate, jobVenue: String
    let jobAccept: String
    enum CodingKeys: String, CodingKey {
        case jobID = "jobId"
        case jobTitle, jobDesc, jobDate, jobVenue, jobAccept
    }
}
You can use this code to convert the JSON to an object:
let root= try? JSONDecoder().decode(Root.self, from: jsonData)