Elite Developers Already Have a Job - Hire Them Fractionally. fraction was founded to help startups and growing companies access the best developers in the United States by hiring them in long-term, part-time ("fractional") positions. The fraction model guarantees success by including project management, product management, and software architecture guidance as part of every engagement. fraction combines the skill of 100% US-based senior developers with this delivery model to outperform offshore, nearshore, and domestic outsourcing options on a price-performance basis.