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
● Hybrid Work
We follow a hybrid work style, combining both office and remote work. Recommended in-office days vary by role. Even when working remotely, we maintain smooth collaboration and communication through tools like Zoom, Google Meet, and Gather.
● Flex Work
You can customize your working hours to suit your day. For business and client-facing teams, schedules are often arranged around client meetings.
● Global Environment
With team members from over 20 countries, we bring together diverse perspectives and ideas, driving projects forward across languages and cultures in an environment where English and Japanese blend naturally into daily communication.
Read More
■Career Page: https://sales-marker.jp/corporate/en/
■Culture Book: https://speakerdeck.com/salesmarker/sales-marker-culturebook-en
■YouTube: 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 |
| 契約期間 | 【Contract Type】 Permanent |
| 給与 |
|
| 勤務地 | 【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 |
| 勤務時間 | 【Working Hours】 Full Flexible with no core hours |
| 休日 | 【Holidays & Vacations】 - Holidays: Saturdays, Sundays, and national holidays; - Paid Time-off: 10 days of annual paid leave will be granted after six months of employment. |
| 福利厚生 | 【Benefits and Perks】 ■Medical checkup ■Travel allowance ■Others High-performance Macbook Book purchase allowance Wantedly Perk Uber Eats Coupon Grant Resort Works |
| 加入保険 | 【Social Insurances】 All types of insurances are covered (Health insurance, employee pension, workers' accident compensation insurance, unemployment insurance) |
| 受動喫煙対策 | 【Second-hand smoking policy】 No smoking inside the building |
| Probation Period | 6 months (same conditions during probationary period) |
| 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 | 336名（取締役+業務委託を含む） |