We all vent at work. That is normal. Tough sprints, messy decisions, frustrating meetings - it happens, and letting off steam is okay and, in fact, healthy.
The problem starts when venting becomes the default. When every lunch turns into complaints, every conversation focuses on what is broken, and people begin to associate you with negativity, it shapes how they see you.
I once actually saw someone lose a strong referral because of this. A former teammate genuinely wanted to recommend them, but hesitated after remembering how often they spoke poorly about coworkers and leadership. Their skills were never in question. The perception was.
Tech is a small world. Your colleagues today can easily become your interviewer, hiring manager, or strongest advocate tomorrow. People remember how you talk about others, especially when they are not in the room.
Venting is fine. Just balance it. Pair frustration with optimism. Most situations are rarely as bad as they feel in the moment.
Reputation compounds, just like good engineering habits. Be super thoughtful with your words.