  Servitization is one of the most significant trends that reshapes the
information world and society in recent years. The requirement of
collecting,storing, processing, and sharing of the Big Data has led to massive
software resources being developed and made accessible as web-based services to
facilitate such process. These services that handle the Big Data come from
various domains and heterogeneous networks, and converge into a huge
complicated service network (or ecosystem), called the Big Service.The key
issue facing the big data and big service ecosystem is how to optimally
configure and operate the related service resources to serve the specific
requirements of possible applications, i.e., how to reuse the existing service
resources effectively and efficiently to develop the new applications or
software services, to meet the massive individualized requirements of
end-users.Based on analyzing the big service ecosystem, we present in this
paper a new paradigm for software service engineering, RE2SEP
(Requirement-Engineering Two-Phase of Service Engineering Paradigm), which
includes three components: service-oriented requirement engineering,
domain-oriented service engineering, and software service development approach.
RE2SEP enables the rapid design and implementation of service solutions to
match the requirement propositions of massive individualized customers in the
Big Service ecosystem. A case study on people's mobility service in a smart
city environment is given to demonstrate the application of RE2SEP.RE2SEP can
potentially revolutionize the traditional life-cycle oriented software
engineering, leading to a new approach to software service engineering.
