@app.route('/a',  methods=['GET', 'POST'])
def a():
    form = data(request.form)

    if form.validate_on_submit():
        job = Job()
        job.title = form.title.data

        return redirect(url_for('users.b'))


@app.route('/b',  methods=['GET', 'POST'])
def b():
    #access here the job.title previous defined