This is probably hyperhidrosis which is due to performance anxiety which may occur without any altered lab reports as you may have high basal metabolic rate as you are giving clue of sweating palm and forehead which direct toward performance anxiety
Software engineer and working as it may make you prone for
vitamin d deficiency due to less sun exposure and vitamin d intake and correction of hyperhidrosis may be pseudo correction but as you are having low vitamin d you may continue treatment
Next Steps
do not hesitate to Learn relaxation technique from psychologist by session if you are experiencing performance anxiety
Health Tips
Wear sleeveless clothes and shorts and go for sunbath in morning