Lead Frontend Engineer — Digital Bank — Tokyo

Location requirement

You must already be living in Japan with valid work authorization. We are not sponsoring relocation or visa transfers from overseas for this role. Applications from outside Japan will not be considered.

About Abbeal

Abbeal is an international IT consulting firm (France, Japan, Canada) placing senior engineers on high-impact product teams. Through Abbeal, lead the customer-facing web application of a from-scratch digital bank in Tokyo.

Context

You will own the customer-facing web app of a greenfield digital bank in Tokyo — a joint venture between a leading Japanese FinTech and a major banking group. Greenfield React + TypeScript architecture, with a strong functional-programming and type-driven engineering culture. International, English-friendly team; Japanese is not required.

Your Mission

Own the architecture and delivery of the customer-facing web application

Build a greenfield React + TypeScript codebase with a strong type-driven, functional approach (Effect-TS)

Design robust integrations against REST / OpenAPI banking APIs

Set frontend standards (testing, CI/CD, performance) and scale the frontend as the product grows

Mentor and grow the frontend team

Profile

Currently based in Japan with valid work authorization — no relocation or visa sponsorship from overseas for this role

8+ years in frontend engineering, expert in React + TypeScript

Strong functional-programming and type-driven mindset (Effect-TS or similar a strong plus)

Experience with TanStack, REST / OpenAPI integrations, and large-scale SPA architecture

Fintech or regulated-product experience a plus

Fluent English; Japanese not required

Location and Setup

Tokyo — hybrid. Permanent or contract options depending on profile. Hired and supported by Abbeal (visa sponsorship + Mobbeal expat support). Indicative range ¥9M–¥15M/year depending on experience.