Shimon Rura, CTO of Happie, recommends James M. Klein for a full-stack developer position. Rura worked with Klein at Happie in fall 2015, where Klein demonstrated excellent development skills, flexibility, and a willingness to help other teams. Klein worked on Happie's Python/Django/PostgreSQL web application, quickly learning Django. He took on tasks ranging from bug fixes to new features and systems work. Rura is confident Klein will continue to have a strong career in software development.

1. Shimon Rura
Chief Technology Officer
Happie
614 Massachusetts Ave., Suite 201
Cambridge, MA 02139
November 16, 2015
To whom it may concern:
I had the pleasure of working with James M. Klein at Happie. He was employed as a full-stack
developer with us in fall 2015 and reported to me. James is an excellent developer and brought a
tremendous amount of energy and knowledge to his work here. He is flexible, great at working
with other teams at the company, and happy to lend a hand wherever needed. These attributes
make him a great team member in any context, and especially at a startup like ours.
James worked on our web application, based on Python, Django, and PostgreSQL. Though his
experience prior to this position was primarily in Rails, he quickly learned enough about Django
to be productive. I found that he learned most rapidly when given appropriate projects, asking
many questions and responding positively to feedback in code and design reviews. Unlike some
developers, he was comfortable working with some ambiguity in requirements, and would
engage directly with end-users when helpful in narrowing and prioritizing requirements.
James’ work ranged from simple bug fixes to significant new features. He also supported a range
of operational/systems tasks that became necessary as our product evolved. Some specific
projects he drove include:
● Implementing a redesign of user profiles
● Handling file uploads from users
● Full UI update on our internal administration site
● Prototype API client tooling for a customer relationship management tool we use heavily
● Enhancements to the UI of our interview events, a highly dynamic real-time video
component of our product
● Internal code cleanup and refactoring
● Rapid development of landing pages and other features to support our marketing team’s
needs
Overall, I would highly recommend James for a full-stack web software development position.
Though he is early in his career, he brings great enthusiasm and skill to the job. Most

2. importantly, he responds well to coaching and has an innate drive to contribute usefully as part
of a team. I’m confident he’ll find an excellent next step and continue to a strong career in
software development.
Sincerely,
Shimon Rura
Chief Technology Officer
Happie