Mid-level Fullstack Engineer

  • Tokyo
  • Partial Remote
  • Full-time
  • October 19, 2023
7,000,000 JPY or more/yr
Apply from Anywhere 👍
Relocation to Japan 👍
(Overseas visa sponsorship supported)
Language Requirements
Japanese: Not Required 👍
English: Business Level
Minimum Experience
Mid-level or above

Job Description

Join our dynamic team at pafin and be a key player in the future of web3 and individual investment. Formerly Cryptact, a leading provider of cryptocurrency P&L calculation in Japan, we're at the forefront of the rapidly expanding DeFi and NFT space. With the rise of web3 technology, we're enabling individuals to take charge of their financial futures like never before. We're looking for a talented full-stack engineer to join our mission and help drive our success.


  1. Professional work experience (3-5 years) using JavaScript or TypeScript, with React and Node.js
  2. Effective communication in English 
  3. Have a strong team mentality with discipline towards reviews, cooperation and knowledge sharing

Preferred Qualifications

  1. Ability to design, implement, and optimize a process and/or workflow to deal with large-scale data and high throughput services in a microservice environment. 
  2. Interest in TypeScript if the candidate hasn't worked with it. 
  3. Experience in Node.js/React/ReactNative 
  4. Fluency in RDB, such as PostgreSQL and NoSQL, such as Redis 
  5. Experience in mobile application development for Android and/or iOS
  6. Experience in recent development tools such as Docker, GitHub, CircleCI 
  7. Experience in AWS 
  8. Knowledge and experience in financial investments.

Working Environment

  • The office is 3 minute walk from Kojimachi station, Chiyoda-ku, Tokyo, Japan.
  • Upon onboarding, you can choose your preferred development environment (an OS of your choice, PC, monitor, mouse, etc) within a certain budget.
  • Our core time is from 10:00 to 16:00, except Wednesdays. You can take a day off on Wednesdays as long as your working hours exceed a minimum requirement.
  • Our work primarily takes place in the office to foster teamwork and creativity. However, we do allow you to work from home some of the time (about 20 hours in a typical month if you don't do overwork).


  • Annual salary paid in 12 monthly installments (including 45 hours fixed overtime allowance).
  • Stock options are available based on your preference.

Other allowance

  • Commutation allowance with an upper limit.


  • Saturday, Sunday, national holidays
  • You can selectively take Wednesdays off after a probation period.
  • 10 days of paid leave after 6 months. 15 days after another year, then the number of days progressively increases each year.
  • 3 days of paid leave for sick leave during the first 6 months.
  • Congratulatory and bereavement leave, maternity/paternity leave, etc


  • Complete health and social insurance
  • Annual health check
  • Free water, coffee, and snacks.
  • Visa support (you don't have to go to Shinagawa since we'll take care of the whole process with an external specialist)
  • Free language lesson: Depending on your level of Japanese, you’ll be able to enroll in a Japanese lesson held onsite by inviting a teacher. We regard this as a necessary business skill. Thus, the lesson is done during business hours, and the firm fully covers the cost. The same would apply to non-native English speakers taking English classes.
  • A housing rent program after the probation period.
  • Employee referral program
  • (For engineering roles) Annual performance review, including 360-degree evaluations.

pafin (formerly Cryptact) is a Fintech start-up whose platform enables you to manage all of your investments in one place — from stocks to cryptocurrency.

Their cryptact service was released in 2017 and is Japan’s largest when it comes to calculating cryptocurrency taxes. Their service also supports US and overseas accounting methods with plans for professionals as well.

They also run fintact, a service that helps people around the world find investment ideas and information. It is designed from the ground up to ensure transparency while providing a rich game-like experience within a large global community of investors.

View pafin's company page

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Mid-level Fullstack Engineer at pafin