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Salary
$44k – $63k per year
Location
Remote/Hybrid (Tokyo, Japan)
Seniority
Junior · 2+ years exp
Employment
Full-Time
Overview
Company
Impact
Profile match
事業者の方 ユーザーの方 企業情報 事業者の方 ユーザーの方 企業情報 How we started 決済の常識を変える Jamm 搾取のない、ストレスフリーな決済を通じて、 個人と企業の可能性を広げる。 Our mission すべての人にフィンテックの力を届け、意識的な支払いをスムーズで楽しい体験へ。 搾取のない決済で、人とビジネスに力を。 橋爪 捷 代表取締役 実家がニューヨークの居酒屋のため、0~22歳までをアメリカで過ごす。大学卒業後マッキンゼー東京オフィスに入社し、その後不動産テックスタートアップのestieに参画。2023年にJammを創業。 How we do it…

Full-Stack Developer

About the Role

We’re looking for a Full-Stack Developer who is excited to build scalable, resilient systems and elegant user experiences at an early-stage startup. You’ll own features end-to-end - from design and architecture to implementation and refactoring - while balancing immediate delivery with long-term technical health.

This role is ideal for someone who thrives in a fast-paced environment, has a proactive mindset, and wants to shape both product and engineering foundations.

Responsibilities

  • Design and implement new features across frontend and backend.
  • Architect systems thoughtfully (DB schema, internal communication, data flows) to enable feature scalability and robustness.
  • Take ownership of delivering individual features end-to-end.
  • Monitor tech debt and drive proactive refactoring.
  • Make smart trade-offs between speed and scalability when implementing features.
  • Continuously refine systems to support future growth.

Requirements

Must-Haves

  • Full-stack development capability (even if frontend-leaning).
  • If experienced, at least 2 years tenure at a single organization is preferred.
  • History of internal promotion is strongly preferred.
  • Proactive in identifying problems before they occur and taking action.
  • High intrinsic intelligence with the ability to make sound short-term and long-term technical decisions.

Preferred Qualifications

  • Excitement about working in an early-stage startup.
  • Curiosity and enthusiasm for new technologies.
  • Experience in the fintech/payments space is a plus.
  • Hands-on experience with some of the following:

Frontend Stack

  • HTML/CSS
  • Tailwind
  • Svelte / SvelteKit
  • React
  • TypeScript

Backend & Infrastructure Stack

  • Go (Chi)
  • ConnectRPC/gRRC
  • Protobuf / Bufbuild
  • Temporal
  • AWS
  • Terraform
  • Git / GitHub
  • PostgreSQL

Why Join Us?

  • Impact from day one: Shape the foundations of both product and engineering.
  • Growth opportunities: Be part of a small, ambitious team where your contributions are recognized.
  • Challenging problems: Work on complex systems that require thoughtful design and proactive innovation.
  • Culture of ownership: We value people who take initiative and push boundaries.
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