Japanese for Software Engineers in Japan: What You Really Need

You can work as a software engineer in Japan with little or no Japanese: some companies run their engineering teams in English. But Japanese still shapes a lot of your working life, from stand-ups and Slack threads to specification documents, client meetings and promotion. For most engineers, a solid working level (often described as around JLPT N3 to N2, though it varies a lot by company) opens far more doors. This guide covers where Japanese turns up in tech jobs, the vocabulary to learn first, and how to keep studying while you ship code.

English-speaking teams exist, but Japanese still matters

Many tech companies in Japan, especially start-ups, global firms and companies that hire internationally, use English as the team language. Code, commit messages and pull requests are often in English everywhere. Even so, engineers on English-speaking teams regularly find Japanese creeping in:

• Stand-ups and meetings slide into Japanese when most of the room is Japanese, or when someone from another department joins.
• Slack and Teams channels outside your own team are usually in Japanese: infrastructure, security, HR, the office channel.
• Specs and tickets written by product managers, designers or clients are often in Japanese first.
• Clients and partners, particularly in contract development and system integration (SIer), almost always work in Japanese.
• Promotion into tech lead or management roles usually means talking to stakeholders, writing proposals and running meetings, much of it in Japanese at many companies.

So the question is less "Is Japanese required?" and more "How far do you want to go here, and how much of the company do you want to talk to?"

What level do companies ask for?

There is no single answer. As a rough picture, English-first teams may ask for none, while many Japanese companies hiring engineers ask for conversational Japanese or more, often written as N3 to N2 on job adverts. Client-facing and lead roles at Japanese companies tend to ask for business level. Our guide to the Japanese level for jobs in Japan explains what phrases like ビジネスレベル (bijinesu reberu) usually mean.

For engineers, the useful split is often between reading and speaking. You can get a long way reading specs and tickets with a translation tool beside you. Live discussion in a meeting is much harder to fake, and that is where gaps show.

Tech vocabulary: the katakana advantage

The good news is that a lot of tech Japanese is English in katakana. Once you can read katakana quickly, words like デプロイ (depuroi, deploy), リリース (rirīsu, release) and バグ (bagu, bug) are free vocabulary. The catch is that the pronunciation is Japanese, so listen for them as well as read them, and some loanwords are shortened or used differently from English.

The words that trip engineers up are usually the kanji ones that describe process and documents:

Reading specs and tickets

Japanese specifications (仕様書) are often long, carefully structured and written in a compact, noun-heavy style. A few habits make them much easier:

• Learn the document vocabulary first. Words like 前提条件 (zentei jōken, preconditions), 想定 (sōtei, expected or assumed), 必須 (hissu, required) and 任意 (nin'i, optional) appear on almost every page.
• Watch the sentence endings. 〜こと (koto) at the end of a line usually means "must do"; 〜とする (to suru) often means "shall be treated as".
• Use translation tools, then check. Machine translation is fine for a first pass, but negatives, conditions and who-does-what are where it goes wrong. Re-read those parts in the original.
• Keep your own glossary. Every project has its own terms. A shared list saves you and the next new hire hours.

Phrases for reviews, stand-ups and meetings

• 昨日は〇〇の実装をしました。今日はテストを進めます。 (Kinō wa … no jissō o shimashita. Kyō wa tesuto o susumemasu.) Yesterday I implemented …; today I'll continue testing.
• 特にブロッカーはありません。 (Toku ni burokkā wa arimasen.) No blockers.
• レビューをお願いできますか。 (Rebyū o onegai dekimasu ka.) Could you review this?
• 細かい点ですが、 (Komakai ten desu ga) This is a small point, but… A soft way to start a review comment.
• 念のため確認させてください。 (Nen no tame kakunin sasete kudasai.) Just to be sure, let me check.
• もう少しゆっくり話していただけますか。 (Mō sukoshi yukkuri hanashite itadakemasu ka.) Could you speak a little more slowly?

Review comments in Japanese teams tend to be softer than in many English-speaking ones. Framing a change as a question or suggestion keeps things smooth. For the tone of everyday messages, see chat messages at work, and for client meetings, meetings with Japanese partners.

How to study while working full time

• Study from your own work. Turn this week's tickets, spec pages and Slack threads into vocabulary. It sticks because you will see it again tomorrow.
• Prioritise listening and speaking. Reading improves on its own once you are surrounded by Japanese text. Meetings do not.
• Rehearse recurring moments. Your stand-up update, a demo, explaining an incident: these follow patterns you can practise in advance.
• Keep sessions short and regular. Twenty minutes most days beats a long weekend session you skip half the time. Our study routine for busy adults has a weekly plan.
• Consider the JLPT as a milestone, not the goal. It helps you get past document screening, and in some cases it can count towards visa-related points schemes (check the current rules with the immigration authorities), but it does not test speaking.

Common questions

Can I get an engineering job in Japan with no Japanese?

Yes, at companies that run teams in English. Your choice of employers will be narrower, and day-to-day life outside work still needs some Japanese.

Is keigo important for engineers?

Less in internal team chat, more with clients, other departments and senior managers. Basic keigo is worth learning once you start talking to people outside your team.

If you want lessons built around your own stand-ups, specs and review comments, an online Japanese tutor can work from your real material with confidential details removed.