Tokyo

Go engineer

Tokyo
Remote OK - Worldwide
Full-time
May 24, 2021

What we're looking for

Zeals is a startup that growing rapidly and we are trying to jump out from the existing frame and develop the new business sector. Zeals is supported by few hundreds or companies and grown dramatically in last 2 years.

Right now the world is under a serious situation created by corona virus, while the needs of real shops and shop assistance are reducing, we think it's a good chance for us to develop a new business need. We are using our existing product to provide new values to the customers by building more humalized using AI jumps to the top priority.

Zeals is one of the top chatbot commerce that have millions of users. We are looking for engineers that willing to restructure our existing monolithic application and convert it to microservices.

Responsibilities

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Extracting domain logic from existing applications, design and re-implement it in golang

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Handling CI/CD for microservices for development and deployment

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Able to design and implement application that can handle large scale of event-driven system

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Continuously Improving performance of existing microservices

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Participate in code review, having strong sense of software/code quality and maintainability

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Able to understand business requirements, design and implement MVP that achieve the requirements

Qualifications

Required Skill

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Profession in development flow based on git

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More than 1 year of go application development.

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Able to implement a simple HTTP server by golang without using any non-builtin libraries.

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Strong understanding on concurrency programming powered by gorouties

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Able to design and implement application that easy to change, developing modules using interfaces

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Strong sense on unit tests, able to write table driven tests using the standard library

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Able to conduct continuous testing using tools like CircleCI and Github Actions

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Strong understanding on RDB, able to write queries or ORM in the application to query data in high performance

Desirable Skill

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Able to use library like Ginkgo to write structured unit tests

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Strong understanding on docker and able to polish compact application with container

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Experienced with microservices design and gRPC protocol

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Experienced with In-memory database like Redis

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Experienced with NoSQL database like MongoDB or Cassandra

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Understanding or experience with cloud environment like GCP, AWS or Azure

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Able to design architecture and application able to tolerate with small unavailability in other part of the system

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Strong sense of idempotence, able to design applications that work well with idempotence.

Desirable Experience

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Experienced with design of product that provide audio or video players

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Experienced with user targeting, segmentation features

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Design experience on large scale of user action data pipeline and analysis

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Experienced with developing payment or ordering system

What You Can Experience

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You can grow together with the team and product, experience of conversational commerce

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Able to work in a diverse team containing engineers coming all around the world

Allowance

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Annual salary : 5M - 9M JPY(Gross) + another package

*** It will be decided considering your experience, skills and market price of the place you live.

----- Japanese follows -------

What we're looking for

Zealsは現在第2の創業といっても過言でないフェーズに来ております。創業以来オンライン販売市場を再定義しチャットコマースという新しい領域を開拓してきました。現在では数百社に登るクライアント様に支持されるまで成長をすることができました。

そして、今正にコロナによって社会の変革がおきており、リアル接客の変革需要が高まっております。Zealsではチャットコマースで築いたアセットを元に、新たなニーズに応えるため、より複雑な会話を行えるコミュニケーションAIの構築が急務になっております。

今回募集するポジションでは国内トップクラスのユーザー数を誇るチャットコマース事業の拡大のため、現状のモノリシックなアーキテクチャに対し、マイクロサービス化を推進するための設計、開発、運用を担当して頂きます。

Responsibilities

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既存のアプリケーションからドメインロジックを抽出し、Golangでマイクロサービスアーキテクチャでの設計、実装をする

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マイクロサービスでのCI/CDの実装と運用

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大規模なEvent-Drivenシステムを耐えれるように継続的に既存のマイクロサービスのパフォーマンス改善

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Code review、継続的なCode Qualityの向上

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ビジネス用件に応じて、Requirementsを理解して、新業務のマイクロサービスの設計、実装

Qualifications

Required Skill

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Gitを用いた開発フローに精通している

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実務でのGolangを使ったApplication開発経験（1年以上）。

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簡単なHTTP Serverをスクラッチから実装できる。

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goroutine を使用した並行処理を実装できる。

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変更に強いコードを書くための、抽象（interface）に依存したモジュール設計ができる。

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標準ライブラリの testing パッケージを使ったTable Driven Testを書くことができる。

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CircleCIやGitHub ActionsなどのCIサービスを使用して、テストを自動化できる。

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パフォーマンスを考慮したSQLを書くことができる。

Desirable Skill

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GinkgoなどのBDD frameworkを使って、挙動仕様をコードとして表現出来ること

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Dockerを用いてセキュアかつコンパクトなイメージを作成する方法について熟知していること

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gRPCを使用したMicroservices間の通信を実装できる。

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RedisやMongoDB、CassandraなどのNoSQLを使った開発経験がある。

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GCP環境でのResource（ネットワーク、VMインスタンス、Kubernetesクラスターなど）の運用経験がある。

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大規模分散システム上で、耐障害性や冪等性を担保するためのアーキテクチャ設計ができる。

Desirable Experience

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音声・動画メディアなどの配信システム周りの設計開発

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ユーザのターゲティング、セグメンティング機能の設計開発経験

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大規模ユーザの行動履歴の分析基盤設計の経験

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ECサービス等での決済、オーダーに関する機能の開発経験

What You Can Experience

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今後マーケットとして成長していくConversational Commerceのプロダクトの開発経験が得られる

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多様性のあるグローバルなチームで様々なインスピレーションを受けながら設計・開発ができる

APPLY NOW ➜

About ZEALS

Build AI that Brings Japanese Omotenashi to the World

ZEALS is an AI company building intelligent products inspired by the Japanese concept of Omotenashi—anticipating people's needs and delivering exceptional experiences. What began as Japan's leading conversational commerce platform has evolved into an AI-native company developing products across autonomous AI agents and robotics.

Today, ZEALS operates three core businesses:

ZEALS AI Engagement, helping enterprise companies deliver personalized customer experiences through AI.
Omakase.ai, a platform for building autonomous AI agents capable of understanding, communicating, and taking action across voice and chat.
Omakase Robotics, developing a robot-agnostic AI operating system that enables robots to work naturally alongside people in real-world environments.

Together, these businesses share a single mission: creating AI that understands people, acts autonomously, and brings the spirit of Japanese hospitality to both digital and physical experiences.

From Market Leader to AI Pioneer

ZEALS established itself as the market leader in conversational commerce in Japan, working with hundreds of enterprise customers across industries including retail, beauty, travel, finance, and automotive.

Building on years of experience designing AI-powered customer interactions, the company has expanded into generative AI and embodied AI. Omakase.ai quickly gained international recognition after launching as the #1 Product of the Day on Product Hunt, with thousands of AI agents created by users within its first months. Meanwhile, Omakase Robotics is applying the same AI capabilities to the physical world, developing software that enables robots to perform meaningful work in human environments.

With teams spanning AI, machine learning, cloud infrastructure, robotics, and product engineering, ZEALS continues to invest aggressively in technologies that shape the future of intelligent systems.

Building the Future of AI

Rather than treating AI as a feature, ZEALS builds products where AI is the core technology. Engineers work across a wide range of challenging technical domains, including:

Autonomous AI agents
Voice AI and multimodal interaction
Large Language Models (LLMs)
Retrieval-Augmented Generation (RAG)
Distributed cloud infrastructure
Robotics software
Computer vision
Real-time systems

Small, highly autonomous teams own products end-to-end, from research and prototyping to deployment and continuous iteration. Engineers collaborate closely with product managers, designers, and AI researchers to rapidly ship new capabilities and solve real-world customer problems.

A Place to Grow

ZEALS has built a culture around ownership, rapid learning, and continuous experimentation. Employees are encouraged to challenge assumptions, move quickly, and take responsibility for delivering meaningful outcomes. The company also supports collaboration beyond day-to-day work through cross-functional lunches, club activities, social events, and opportunities to connect across teams.

Japanese Language Policy
At ZEALS, the product and technology team members primarily speak English (dev-related discussions happen in English on Github or Slack). There might be occasional discussions in Japanese, but most Slack messages are in English (or both languages).

As for meetings, all dev-related discussions take place in English. Given the above, Japanese skills are not required for most positions in the Product & Technology departments. However, one unique aspect of ZEALS’ culture is the desire to increase teamwork and engage with each other, which is why many Japanese members are working on their English skills while many non-Japanese members also work to improve their Japanese skills.

In order to build a truly global team, ZEALS has many multilingual members that proactively support the rest of the team to ensure smooth communications.

Even outside of the Product & Technology departments, all important company-wide announcements are made in both English and Japanese. For example, hiring announcements, new product launches etc. are generally announced in both Japanese and English.

Also, simultaneous interpretation for presentations at large meetings and events is provided to ensure that everyone gets the information they need.
Paid Leave
- All Japanese public holidays off
- 10 days of PTO (awarded 3 months after joining) in the first year
- 5 refreshment leave days per year
- Summer Holidays, Year-end Holidays, Childcare Leave, Congratulations/Bereavement Leave
Benefits
Here are some examples of the benefits which full-time employees can receive:

💻 Loaned Laptops

🇯🇵 Translation Support (EN<>JP)

👶 Shorter Work Hours for Employees Taking Care of Children

👶 Parental Leave

👕 Flexible Dress Code

💜 Social Security / Insurance Benefits Included

🏥 Healthcare Insurance, Periodic Health Checks

💚 Pension Insurance

🚃 Commuter Reimbursement
Remote Work
Although ZEALS requires you to either be in or relocate to Japan, once you’re here, you can choose whether you work from home or in the office.
- Full-time employees in Japan can work from home or come to the office. Transportation reimbursement to and from the office is available and people living close to the office can receive a housing allowance.
- If you’re not based in Japan yet, you can work from overseas while we help you obtain a Japanese working visa.
- Work from your home country 2 months per year.
Work style
ZEALS is flexible when it comes to working hours. They have core time from 1:00pm to 3:00pm JST, but otherwise you’re free to set up your day however you want to meet the monthly working hour requirements.
Values

FROM ZEAL

< Passion >
Good things come from giving it your all

BET ON PARADOX

< Unorthodox >
Never settle for the established norm

UNITED WILL

< Team >
Teamwork is the heart of achievement

Office

The ZEALS office is in the heart of Tokyo, situated in Meguro, near Gajoen, a famous hotel known for hospitality. You can work from the office at a desk as well as use small booths or meeting rooms. You can hook your laptop to large screens and sit in Ergohuman chairs. Lounge areas and standing tables are also available. Everyone is free to choose the work style that works best for them, either full-remote or in the office.