It all comes down to your career goals. If you aspire to pursue a career in the finance/banking industry then take the job at Sterling bank and acquire other qualifications along the way that will facilitate your growth in that industry.

But if you aspire to pursue a career in civil engineering then I strongly advice you to take up the Thailand Master's scholarship. Beyond the Master's degree also set your mind to pursue a PhD in Civil engineering. As a 1st class graduate following your Master's degree, the opportunities available to you for PhD studentships/scholarships are immense. After you've completed your PhD you'll have the absolute liberty to decide whether to work in government, academia or in industry.

:-)