Senior Backend Engineer (with Native-level Japanese)

Tokyo
Remote OK - Anywhere in Japan
Full-time
August 29, 2024

About KOMOJU

KOMOJU (by Degica) is the leading cross-border payment gateway for Japan. We power payments for companies like video game distribution platform Steam and the popular mobile app TikTok. Today we help thousands of merchants by providing them with the payment infrastructure they need through developer-friendly API’s to integrations on popular platforms like Shopify and Wix; we help our merchants grow in all markets they are expanding.

About the position

We are looking for a senior backend engineer to help up build our platform to handle payments on a global scale. You will primarily work with Ruby, building out features using Ruby on Rails. As we’re still scaling our front-end team, you may be asked occasionally to work on front-end tasks as well.

As a senior developer, you will need to work with our product managers to define requirements and convert that into a usable architecture to discuss with colleagues. As hiring and supporting new developers is important to us, you will be expected to be able to mentor junior developers, and work with them to improve their core skills.

In addition, as a payment service originating in Japan, KOMOJU supports numerous Japan-specific payment methods. This requires reading and interpreting extensive documentation written in Japanese, defining the development required at KOMOJU, writing down requirements in another language as needed, and assisting other team members with implementation tasks. In some cases, it may be necessary to speak directly in Japanese with KOMOJU's partners who are providing the payment instruments, explaining the issues and obtaining technical support.

Our ideal candidate has experience working with large web applications. They will know how to build reliable, scalable, and performant web applications. Testing and code quality are also extremely important to us, so having a strong knowledge of testing and the different testing types is required.

Responsibilities

Understand product goals and feature requests and translate them into working software
Support team members through code review and architecture discussions
Write tests that validate the stability and correctness of implementations
Mentor junior developers and help them grow their skills
Handle refactorings with both bravery and care

Requirements

Experience with building performant and scalable APIs, including DB performance
Experience with integrating with third party APIs in a secure and fault-tolerant manner
Experience and understanding of common web exploits and how to mitigate them
Strong understanding of OOP programming languages and patterns
Native-level Japanese
No strong resistance to internal communication in English.

Nice to Haves

These aren't required, but be sure to mention them in your application if you have them.

Experience with Ruby on Rails
Experience with TypeScript and/or Vue.js
Experience with payments or payment systems

Benefits

At Degica, we embrace remote work while also offering office space for those who prefer in-person collaboration
10 days regular vacation, additional 5 days summer and 5 days winter vacation
Paid birthday holiday
Budget for self-learning allowance, to ensure our employees’ skills remain current
Language training for Japanese

KOMOJUについて

KOMOJU (コモジュ)は2016年に当社が開発した日本および世界のEC事業者向けの決済代行サービスです。 Steam, Shopify, Wix など様々なECプラットフォームに決済手段を提供し、API での直接導入が可能です。一つのKOMOJUアカウントで、日本のクレジットカード決済、コンビニ決済、スマホ決済、銀行振込、キャリア決済、後払い決済、プリペイド決済などから、韓国や中国、東南アジ、ヨーロッパなど世界中の決済方法が利用可能になります。

このポジションについて

グローバル規模での支払い処理プラットフォームを構築するために、 Senior Backend Engineer (シニアバックエンドエンジニア) を募集します。主に Ruby および Ruby on Rails を使用した機能の構築に取り組みます。フロントエンドチームがまだ拡大中のため、場合によってはフロントエンドのタスクを担当することもあります。

シニア開発者として、プロダクトマネージャーと協力して要件を定義し、それを実用的なアーキテクチャに落とし込み、実装を同僚と議論する仕事に従事していただきます。新しい開発者の採用とサポートが重要なため、ジュニアな開発者を指導し、彼らのコアスキルを向上させる能力が求められます。

また、日本発の決済サービスとして、 KOMOJU では多数の日本特有の決済手段をサポートしています。そのため、日本語で書かれた膨大なドキュメントを読み解き、 KOMOJU で必要な開発を定義し、必要に応じて要件を別の言語で書き下し、他のチームメンバーによる実装作業を支援することが求められます。場合によっては、決済手段を提供している KOMOJU のパートナーと日本語で直接会話し、課題を説明し、技術サポートを受けることも必要となるでしょう。

信頼性が高く、スケーラブルでパフォーマンスの高いウェブアプリケーションを構築した経験が求められます。特に、大規模なウェブアプリケーションの開発経験を持つ方を歓迎します。また、テストとコード品質も非常に重要であり、テストについての幅広い知識が必要です。

職務内容

プロダクトの目標や機能要求を理解し、それを動作するソフトウェアとして実装する
コードレビューやアーキテクチャの議論を通じてチームメンバーをサポートする
実装の安定性と正確性を検証するテストを書く
ジュニアな開発者を指導し、彼らのスキル向上を支援する
勇気をもって配慮のあるリファクタリングを実行する

応募資格

データベースのパフォーマンスチューニングを含む、高性能でスケーラブルな API の構築経験
安全かつフォールトトレラントな方法でのサードパーティ API の統合経験
一般的な Web の攻撃手法とその緩和方法に関する経験と理解
オブジェクト指向プログラミング言語とデザインパターンへの強い理解
ネイティブレベルの日本語
英語での社内コミュニケーションに強い抵抗がないこと

望ましいスキル

これらは必須ではありませんが、持っている場合はぜひ応募時にお知らせください。

Ruby on Rails の経験
TypeScript および Vue.js の経験
決済の絡むアプリケーション、または決済システムの構築の経験
CEFR B1 レベルの英語スキル
外国語と文化交流に対する興味と、継続的な学習への意欲

Benefits

Degicaでは、リモートワークとオフィス勤務のハイブリットスタイルを導入しています。
フレックス制（コアタイム10:00-15:00)
海外からの勤務可能（地域によって年間最大3ヶ月の海外からの勤務が可能）
有給10日間、夏季休暇5日間、冬季休暇5日間、有給誕生日休暇
社員のスキルアップ目的のため、自己学習手当の予算（年間10万円）を用意しています
日本語／英語の語学学習プログラム

語学力向上の為、語学学校と提携し、英語コースと日本語コースの両方を提供しています

Komojuカードプログラム（月額5000円）：ランチ、コーヒーなどの使用用途
社会保険（関東IT健康組合）、労働保険完備
通勤手当支給

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About KOMOJU

KOMOJU (by Degica) is the leading cross-border payment gateway for Japan.

We power payments for companies like video game distribution platform Steam and the popular mobile app TikTok.

Today we help thousands of merchants by providing them with the payment infrastructure they need, through developer-friendly API’s to integrations on popular platforms like Shopify and Wix; we help our merchants grow in all markets they are expanding.

When it comes to engineering, we believe in having a flat, inclusive culture and constantly improving by continuing to evaluate ourselves. We also prize individuality and believe that each member brings their own unique value to the team.

Our development processes are always updating as the company grows, and we have an engineering culture that largely organizes itself and each engineer has a lot of ownership in their own projects. This culture allows engineers to showcase their strengths while continuing to grow.

Japanese Language Policy
With around half of their total members (and around 75% of engineers) coming from outside Japan, KOMOJU generally uses English for written communication (e.g. Slack, Github). Verbal communication is also primarily in English.

However, quite a few people working there can speak both English and Japanese fluently so Japanese may be spoken at times during meetings, especially when they involve teams other than engineering.

Overall, the language spoken depends on the team. The dev team uses mostly English, but their HR team (for example) speaks primarily Japanese.
Visa Sponsorship
KOMOJU sponsors visas for candidates living outside of Japan. They’re still hiring from abroad, but due to travel restrictions related to COVID-19 new employees from abroad may need to start working on a contract basis. KOMOJU will switch you over to a full-time employee contract and sponsor your visa once it’s safe to come to Japan again.

KOMOJU also helps out with relocation (searching for apartments etc.) but they don’t have a formal policy for this. The support offered depends on each individual case. They do always pay for flight tickets to Japan in the case that someone moves from abroad however.
Paid Leave
KOMOJU has a very generous vacation policy.

Like most companies in Japan, their basic PTO package starts with 10 days of normal paid time off during an employee’s first year, followed by increases in subsequent years in accordance with Japanese labor law.

KOMOJU also offers 5 extra vacation days that can be used during the summer months, and another 5 days of year-end holidays.

They also have birthday leave, which means members can get an extra day off each year on their birthday. So that’s a total of 21 vacation days per year in addition to Japanese public holidays. They also offer maternity and paternity leave.
Benefits
💻 New tech gear

👩‍🎓 Skill development support

💛 Support for attending conferences

🧡 Seminar participation support

📕 Book purchases

👶 Parental Leave

👩‍🏫 Language Learning Support

💜 Social security / insurance benefits included

🏥 Healthcare insurance

💚 Pension insurance

🚃 Commuter allowance

👍 Motorized sitting / standing desks when working from our office
Engineer Interview Process
Engineering Jobs

KOMOJU’s interview process skips the high-pressure whiteboard interviews in favor of a coding challenge that’s closer to what engineers would actually work on day-to-day.

Here’s the basic interview flow:
- First interview: Meeting with two KOMOJU engineers to discuss about something you’ve built and see if you’re a good cultural fit
- Second interview: Technical challenge to test your real-world development skills
- Third interview: Meeting with a senior leader in the company
Remote Work
KOMOJU allows full remote work from anywhere in the world! The only stipulation is that your work hours must have some overlap with the JST time zone.

Even once COVID-19 is no longer a concern, KOMOJU intends to continue their full remote policy.

And if you do relocate to Japan, there's no need to live near their Tokyo office — you can work from anywhere in Japan.
Work style
KOMOJU has an office in the Kichijoji area of Tokyo, but they’ve switched to working fully remotely due to COVID-19. A typical work day at KOMOJU begins at around 10:00AM for most people. Some teams begin with a stand-up meeting where they quickly share their tasks for the day before focusing on work for the rest of the day.

One unique aspect of KOMOJU’s work style is their code review process. Since they have a flat hierarchy and a relatively small team, they have a system where reviewers are selected randomly. Their engineers also take care of operations and handle errors or technical customer queries as a team via Slack.

A typical stopping time for engineers at KOMOJU is at around 7:00PM, and they have very little overtime so engineers normally won’t be online past this time. They also make it a point to avoid unnecessary meetings and prefer to have ad-hoc discussions with relevant members only.
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