Tairo Moriyama

AIM: Improve KPIs using search technology, AI and data science

Media & Interview



Technical Product Manager SmartNews, Inc. – Tokyo
Jan 2020 – Present

Director – Head of Data/AI/Search Mercari, Inc. – Tokyo / San Francisco
Nov 2016 – Dec 2019

Head of Data / AI / Search Engineering – Tokyo          
・Raised “search-to-buy” conversion rate 4.0% resutling in 2.0 billion yen as annual revenue
・Achieved team goal while by finding the best balance between “freshness”, “recall” and “precision”
・Defined metrics in order to evaluate A/B tests correctly to establish data-informed culture
・Designed scalable recommender system able to overcome typical recommendation problems
・Effectively leading more than 70 software engineers as the Head of Data and Engineering Manager of Search & AI teams – Tokyo / San Francisco       
・Built engineering team by recruiting 10+ software engineers from Yahoo, Google, and Rakuten
・Released “Photo Search” feature utilizing image recognition & deep learning
・Developed distributed search platform based on elasticsearch and GCP as a microservice

Product Manager of Search – San Francisco        
・Improved profit by $1.5 million/ month by suggesting correct shipping plan utilizing machine learning
・Succeeded in personalization resulting in an additional 3.0% of GMV / 1.2 billion yen revenue/year
・Cut complaints in half by building & introudcing new UI/UX 

Search Engineer / Manager of Data Science BIZREACH, Inc. – Tokyo
Nov 2013 – Oct 2016

Search Engineer / Manager of Data Science Team – Tokyo        
・Introduced new technical approach to clarify duplication of jobs after aggregation
・Improved ad CTR of search results 10% optimizing relevancy between keywords & user behavior
・Developed system to automatically embed lables for new job listings from existing job descriptions

Search Engineer / Product Manager – Tokyo
・Prototyped job search engine app similar to indeed.com
・Aggregate jobs, extracted and put them on a map to make people search nearest jobs easy
・Developed Inverted Indices utilizing deep knowledge of Elasticsearch & Solr on AWS
・Developed ability to compare algorithms using the “Side-by-Side Test approach

Founder CEO / Software Engineer Wildcard, Inc. – Tokyo
Dec 2012 – Oct 2013
・Built scout database focusing on new graduates who have already got offers from companies
・Students could meet presidents or VPs directly to shorten the interview process 
・Developed the system based on RoR and AWS 

Software Engineer / Marketing Manager Insource, co,. ltd. – Tokyo
Jun 2011 – Nov 2012
・Developed business training content system based on PHP for 300 clients in Japan
・Optimized website and doubled leads doubled from companies which considered business training

Frontend Engineer /Marketing Y-CUBE Corporation – Tokyo
Jan 2008 – May 2011
Marketing Manager Experian japan, co,. ltd. – Tokyo
Jan 2005 – Nov 2006
HR Staff/ Recruiter Recruit, co,. ltd. – Tokyo
Apr 2002 – Dec 2004


Graduated Bachelor of Commerce Science of Waseda University – Tokyo Mar 2002

Technical Experience

・More than 8 years experience of leading software development projects as a technical leader
・Leading international teams for 3 years – hiring and nurturing technical talent from all over the world
・Building bridges between engineers, product managers, and business managers
・Solving customer experience and business problems with the power of AI
・Designing system architecture considering robustness, even if best practice is theoretically correct
・Hands-on professional experience across various programming stacks (Python/PHP/Java), DB (SQL/NoSQL), Search Inverted index (Solr/Elasticsearch), Cloud platforms (AWS/GCP)
・Hands-on improving experiments with the knowledge of data science (Jupiter/Scikit-learn/Tensorflow).

Social Media

・LinkedIn: https://www.linkedin.com/in/tairo-moriyama-03315042/
・Twitter: https://twitter.com/tairo
・Facebook: https://www.facebook.com/tairosan