takahirofujii.dev — ontology.ttlあ / A
# story renderer · :fujii/profile

Takahiro Fujii

Product Engineer / Designer / CTO — Tokyo

Leading product development as CTO at WealthPark Inc.
Also actively involved in product development and UI/UX design as an engineer utilizing LLMs.

After graduating from university, joined Rakuten, Inc. and worked on the development of Rakuten Travel.
In the international business team, involved in the launch and development of multiple new services, including booking systems for overseas hotels, management screens, accounting systems, inbound sites, and external system integration.
Started career as a full-stack engineer. Since 2017, specialized in the UI/UX domain as an engineer and engineering manager, leading the management of web frontend and Android/iOS app development teams, and driving the growth of services and organizations.

Joined WealthPark in 2020.
After working as a frontend development lead, focused on building and strengthening a multinational engineering organization (product development, PdM, SRE, security, QA, PMO, etc.) as VPoE, while leading the development of multiple services in the real estate and FinTech domains.
Appointed to the current position of CTO in 2024.
As CTO, also focusing on establishing budgets, mid-to-long-term development roadmaps, resource allocation, and evaluation systems.

As a freelancer and in private projects, involved in planning, design, and development, including product management and design.
Hobbies include basketball and cooking and drawing.
Favorite things are coffee, alcoholic beverages, and Japanese cuisine in general.

Career

WealthPark:wealthparkDeveloping and operating products for real estate management companies and property owners, as well as a digital platform for alternative investments. Joined in 2020; frontend development lead, VPoE and SVP before being appointed CTO in 2024.Rakuten (Travel):rakutenFull-stack engineer and engineering manager at Rakuten Travel. In the international business team, launched and developed multiple new services: booking systems for overseas hotels, management screens, accounting systems, inbound sites and external integrations.Designers Gym (Goodpatch):designers-gymFormal design training — one of the places where an engineer earned the right to say "designer".Aoyama Fashion College:afcCreated the syllabus and taught web production for the Fashion Tech Department at Aoyama Fashion College (AY2023).

Voice

Koiki.fm:koiki.fmCo-hosting a podcast for Engineering Managers (2020-present). Logo drawn by the host (→ :illustration).Talks:talksConferences, meetups, university lectures — orgs, frontend, agile, careers.AI Seminars:ai-seminarsAI and ChatGPT intro seminars and panel discussions for real-estate companies and business teams, including 'AI is Not Difficult! AI Super Introduction for Real Estate Companies'.Book Translation Reviews:book-reviewsPerformed translation reviews of The Staff Engineer's Path and Software Architecture and Decision-Making (2024).note (blog):noteCareers, orgs, books, and "the art of staying in a good mood". The written archive.

Craft

UI / UX:ui-uxSince 2017, specialized in the UI/UX domain as an engineer and engineering manager, leading web frontend and Android/iOS app teams and driving the growth of services and organizations.Illustration & Design Works:illustrationI was never the kid who could draw. It started in my second year of university, when I spent my internship earnings on the full Adobe Creative Suite. From there came teaching materials, banners and flyers in Illustrator, and the designing never stopped: logos and design work as a hobby and freelance. The Koiki.fm logo, Line stickers, business cards and basketball uniforms in this gallery are part of that.LLM:llmDeveloping products built on AI features and per-customer customization — talking directly with existing and new customers and partners, from framing the problems to shaping the solutions. Also the owner of the company-wide AI strategy and its adoption.

Life

Basketball:basketballIt started in elementary school when an older kid invited me in. The turning point came in junior high: my school had few summer clubs, so I started playing on the street courts of Komazawa Park. The friends I met there are still my teammates more than twenty years later. We formed a team, entered tournaments, and I sometimes designed our uniforms too. These days basketball is hobby and exercise, with friends.Cooking:cookingAs a kid I sometimes cooked for my father. Living alone made it a daily thing. It started with cookbooks; the pandemic, YouTube cooking videos and remote work together turned cooking into an everyday habit. I like following a recipe first, then adding my own tweaks and arrangements. Mostly Japanese and Chinese food.
Every bold term in this article is a node in the graph — the same relations, poured into prose.