Boston (US) as well as London (UK) - youDevise, Ltd.

We're a 60-person financial-software firm committed to learning and improvement as well as great web software and agile development. We're hiring developers and other smart folks of many kinds. See http://www.youdevise.com/careers and https://dev.youdevise.com.

We help successful candidates relocate to London or Boston including arranging visas where needed. For example, earlier this year we hired an HN reader from Denmark and we moved a Polish employee to Boston.