Paul Callahan possesses expertise in software development, software design, java, web applications, scalability and 13 more skills. Colleagues describe him as "I have worked with Paul at 4 separate companies as a colleague at Hyseq, Kendara, Excite@Home, and at Ingenuity spanning a work period of around 10 years, the biggest span of time of overlap being at Ingenuity of 7 years. Paul is an highly talented developer. He possesses a great depth of knowledge on algorithms and how and when to apply the most appropriate one to the task. His code is impeccably written with good style and object oriented patterns making relatively easy to maintain… Show more" and "I had the pleasure of managing Paul directly for 2.5 years, and indirectly for a bit longer than that. Paul is capable of taking on tricky technical challenges. He makes good use of data in building his strategy, and he thinks of mechanisms to ensure these patterns are sustainable. One example of this was a data modeling problem with both complexity and significant load challenges, where Paul thought through various designs, rigorously measured performance, and provided prompt support… Show more"