David Wang Email & Phone Number

Auckland, New Zealand

•Query rewriting: Training a model A to identify whether two queries are paraphrases with traditional classification algorithms. Then generating a big training data based on this model A. Finally training a transfomer model with the generated big training data as the final model B. This model B is similar to a translation model, which “translate” the original query into another one or several queries to improve the accuracy, recall, versatility of web searches.•Elo recommendation system: Kagglers develop algorithms to identify and serve the most relevant opportunities to individuals, by uncovering signal in customer loyalty. This is a traditional regression problem which involves a lot of feature engineering and traditional regression algorithms •Homecredit classification task: Homecredit makes use of a variety of alternative data--including telco and transactional information--to predict their clients' repayment abilities. This is a traditional classification problem which involves a lot of feature engineering and traditional classification algorithms such as linear regression, gbdt, etc.

Auckland, New Zealand

•Grasping design methodology (e.g. Kimball dimensional modelling) and BA skills for DW/BI•Mastering popular toolsets such as SSIS, SSAS, SSRS and PowerBI•Rich experience in Managed Services

Beijing,China

Responsibilities•As a solution architect, the main responsibility was analysing business requirement, controlling scope of work, discovering major risks from solution perspective, keeping clients and developers on the same pageStrengths and achievements:•Creating a DW/BI system to help the telecommunication operator to select targeted customers for promotion, which greatly increases hit-rate and reduces human costs. •Identifying 30million New Zealand Dollars (equivalents) of revenue leakage per year for customer by analysing business requirement, negotiating solutions with internal development team, controlling the scope of work and identifying the major revenue leakage problems. •Creating a IPC(Intelligent Policy Centre) system which integrates BSS promotions and wireless policy control.•Creating a PoC project to help customers understand the new possible business scenarios in BSS area under 4G wireless network as a delivery solution architect, which won first prize in the whole corporation.

Beijing City, China

Responsibilities•As a developer, the main responsibility was developing and optimising BSS systems written inC/C++ and Oracle PL/SQL •As a service engineer, the main responsibility was delivering and maintaining BSS systemsStrengths and achievements•Developing a top-up system for a telecommunications operator which supports 40million users. I designed the ER models, wrote all the oracle procedures, designed and installed the oracle database. •Replacing Amdocs’ billing system with Asiainfo-linkage’s billing system which support more than 20million users after 2 year’s hard work. •Optimising C/C++ code and promoting 3-times performance for a billing and balance system which handles more than 700million users’ roaming CDR for GPRS and info fee.

Beijing City, China

Responsibilities•As a developer, the main responsibility was developing new systems with C/C++ and Oracle PL/SQL•As a service engineer, the main responsibility was Maintaining, troubleshooting, diagnosing and resolving issuesStrengths and achievements•Rewriting and Immigrating a top up system from windows to AIX by using a self-written platform-independent multithread networking framework with C/C++ language. I also designed the oracle backup and recovery strategy and wrote the backup scripts.•Developing a PHS(Personal Handy-phone System) “roaming” system which helped the customer to strengthen their competence in mobile market and reduce the trend of user losses. In the project, I wrote all the core background programs with C/C++ language. I also designed the ER models and wrote all the oracle stored procedures.

Master Of Computer Applications - Mca, Computer Applied Technology

Bachelor Of Engineering - Be, Electronic Engineering