His best bet would be to register with a few job web sites, Linkedin etc. and then apply for any relevant vacancies. He will need to be sponsored by the company, who will have to prove they cannot fill the vacancy locally, where Ukraine is outside of the EU. The EEA agreement signed last week is going to relax visa requirements, but this will only be for a visit of up to 3 months and not working, but at the moment he will need to spend £65 with a visit (or two, if they call him for interview) to Kiev to get a visa to visit the UK. He will need to prove that he has got somewhere to stay, a return ticket and sufficient means to look after himself. You can help here by him staying with you and stating you will cover him financially, but these days for that you normally need a minimum of £3,000 in savings, proof of accommodation through showing a rent agreement or mortgage details and regular income by supplying copies of your last 6 months bank statements. This is all alot of hassle, which I've been through several times, so my wife's sister could visit for a holiday. You may also need to help him fill in the visa application which is only available in English on the Home Office website.
To work here he will need a work permit, which will need to be sponsored by his employer, these are not cheap at about £1,000 for one year, which an employer will look to recoup with a lower salary offer.
The good news is that the is a big shortage of people with IT skills in the UK, so the vacancies are available. Personally, I would recommend that he concentrates on improving his programming skills with C#, Java and PHP as these are very much in demand and will command better salaries. Get him to create a few demos as that makes a big difference in interviews, along with enthusiasm. All programming languages use english words and he will be expected to speak and write good english, for self-documenting the code and for ease of maintenance and possible increased functionality in the future, so if he is not fluent, he needs to really work on this.
HTH