About Us

At Sales Marker, our mission is to create a world where all people and companies can challenge themselves beyond existing boundaries. We’re one of the fastest growing start-ups in Japan and we’re growing at a speed that is twice as fast as Unicorn startups. By using our product, sales teams can improve their work efficiency by 3 times. We have achieved over 900% YoY business growth rate in 2.5 years since our flagship product 「Sales Marker」 was released and we’re currently actively working on a wide range of new product portfolios.

The Team

Our co-founders are from top companies in Japan and the world such as NRI, Keyence, LINE, Microsoft, and PwC. They were selected as 「FORBES 30 UNDER 30 ASIA LIST」 in 2023 . In our Engineering & Product team, we have members from more than 16 countries and they come from top tech companies in the world such as Google, Microsoft, Indeed, and famous tech companies in Japan such as Mercari, LINE, Yahoo, Smartnews, etc. 

Responsibilities

Leveraging your expertise in AI agent technology, you will participate in cutting-edge development. In this role reporting directly to the CTO, you will utilize your deep technical knowledge to engage in the design and implementation of AI systems, while pursuing product quality and technical superiority. Furthermore, you will deepen collaboration with team members and play an active role as a technical guide.

You will be required to develop scalable AI agents for enterprise use, utilizing the latest technologies such as MCP, LLMs, and Generative AI.

• Design and implement agent functionalities leveraging LLMs.


• Develop task automation and complex prompt designs (e.g., Chain of Thought, Tool Use).


• Improve dialogue flows and decision-making logic with a focus on user experience.


• Design and measure AI evaluation metrics (e.g., hallucination rate, success rate).


• Develop scalable APIs and modules.

Requirements

• Development experience in Python or a similar language (3+ years).


• Experience utilizing LLM APIs (e.g., OpenAI, Claude, Gemini, Mistral).


• Experience designing web backends using REST API or GraphQL.


• Experience in developing AI applications using AWS or GCP, and in designing, building, and operating the infrastructure on AWS or GCP.


• Knowledge of Computer Science fundamentals, including data structures and algorithms.


• Development experience on an in-house product (3+ years).


• Understanding and practical experience with Model Context Protocol (MCP).

Nice to Have

• Experience using agent-related libraries such as LangChain or Semantic Kernel.


• Experience developing prototypes with consideration for UI/UX integration.


• Experience building GPTs or custom chatbots.


• Business-level English proficiency.

Our Tech Stack

[Front-end]

• TypeScript, React;


• Libraries: Storybook, jest;


• Hosting: Amplify

[Server Side/Back-End]

• Infrastructure: AWS, ElasticBeanstalk


• DB: Aurora, ElasticSearch;


• Languages: Go, Typescript


• Analysis environment: Athena;


• Framework: Express;


• Monitoring: DataDog;


• Others: AWS Lambda, AWS Batch, AWS API Gateway, AWS Glue

Why Us?

• One of the fastest growing Saas startup in Japan with strong financial growth


• Innovative new product development and opportunity to build things from scratch.


• Plenty of leadership and career development opportunities.


• Full remote-friendly & full flexible work schedules.


• Global team and English speaking environment.


• Great benefits & perks packages such as Resort Worx, Purchasing Books, Free Weekly Lunch, Offsites, etc.

Working Style

● Remote Work

We’re remote friendly. We use Zoom and Meet, and recently introduced the virtual office platform Gather to maintain both the quality and quantity of communication while working remotely, ensuring smooth development and operations. 

● Flexible Work
You are free to customize your daily working hours.Taking into account the situation within the company and your team, you will manage your schedule and tasks within reasonable limits. Each employee adjusts their working hours to meet the monthly requirement of 8 hours per working day.

● Work-Life Balance
We value a healthy work-life balance.Whether you want to focus heavily on work or prioritize your personal time, we believe this is an environment where both approaches can thrive.

Read More

■Career Page: https://sales-marker.jp/corporate/en/(https://sales-marker.jp/corporate/en/)

■Culture Book: https://speakerdeck.com/salesmarker/sales-marker-culturebook-en(https://speakerdeck.com/salesmarker/sales-marker-culturebook-en)
■YouTube: https://www.youtube.com/watch?v=Ob8Ds06zwo0(https://www.youtube.com/watch?v=Ob8Ds06zwo0)

【職種 / 募集ポジション】
Senior Software Engineer - Backend AI Agents
【雇用形態】
正社員
【給与】
年収 8,000,000円 〜 25,000,000円
【Additional Notes about Compensation】
※The actual offer will be decided based on your experiences and skills.
【勤務地】
150-6032 Level 32, Yebisu Garden Place Tower, 4-20-3 Ebisu, Shibuya-ku, Tokyo
【Office Location】
5 minutes walk from the east exit of Ebisu Station on the JR Yamanote Line
7 minutes walk from Exit 1 of Ebisu Station on the Tokyo Metro Hibiya Line
【Probation Period】
6 months (same conditions during probationary period)

会社情報

【会社名】
株式会社Sales Marker
【設立年月】
2021年7月29日
【本社所在地】
〒150‐6032
東京都渋谷区恵比寿4-20-3 恵比寿ガーデンプレイスタワー32F
【資本金】
1億円
【従業員数】
270名（取締役4名＋正社員170名＋業務委託80名）