When professionals leave a job, most of their workplace relationships quietly dissolve within a few months. This is one of the more costly and avoidable mistakes in professional life. Former colleagues who know your work, your character, and your capabilities are among the most valuable connections in your network — and unlike new contacts, they require no introduction.
Why Former Colleagues Are Uniquely Valuable
A former colleague can refer you to a role at their new organisation without any of the uncertainty a stranger faces. They can provide a reference grounded in direct experience. They can tell you about opportunities before they are posted. And because they have already formed an accurate picture of your abilities, they are far more likely to advocate effectively on your behalf than someone who only knows you through a resume or a LinkedIn profile.
How to Stay in Touch Without It Feeling Forced
- Congratulate them on milestones — a new job, a promotion, a work anniversary, or a published article is a natural reason to reach out without any agenda.
- Share something relevant to their work — a short message with an article, a tool, or a piece of news they would find interesting shows you are paying attention to their professional world.
- Check in when you do not need anything — the most durable professional relationships are maintained during calm periods, not only activated in moments of need.
A Simple System That Works
Most people struggle with this not because they lack the intention but because they have no system. A basic approach: keep a list of twenty to thirty contacts you want to stay in touch with, and aim to reach out to two or three of them per week. Rotate through the list. It takes ten minutes a week and compounds significantly over the course of a career.
The Long View
Careers unfold over decades. A colleague who was a peer today may be a hiring manager, a client, or a potential business partner in five years. Treating each workplace departure as a network checkpoint — rather than a final goodbye — is one of the more underrated habits of professionals who consistently build strong careers.