First off, what is your nationality - do you have citizenship to an EU country? If you do, then it's easy to get a residence permit, which gives you the legal right to work in Switzerland. From there, your past work experience will leave you fairly well-prepared to find work in Switzerland. In fact, the IT sector is the industry that a large amount of foreigners find jobs in.
If you don't have EU citizenship then you have a long journey ahead of you. You'll need to first find a job, convince a reluctant Swiss employer to hire you because no other local is qualified to perform the job, and then start the residence permit application process. Only once this is granted can you actually begin work. You should note that the Swiss employ an incredibly restrictive, quota-based foreign immigration policy that only grants residence permits to, arguably, the incredibly wealthy and the highly skilled and educated.
For more info, read the Visas for Switzerland page.