Sr. Software Engineer

  • Tokyo
  • Partial Remote
  • Full-time
  • April 10, 2026
Conditions
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¥7M ~ ¥10M /yr
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Apply from Anywhere 👍
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Relocation to Japan 👍
(Overseas visa sponsorship supported)
Requirements
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Language Requirements
Japanese: Business Level
English: Business Level
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Minimum Experience
Senior or above

Role Overview

This role is focused on building AI-powered tools that support sales enablement. As a Software Engineer, you will work on designing and developing product features that leverage AI technologies to improve how sales teams operate and create value for users. This is a high-impact position for engineers who are excited to work at the intersection of product development and applied AI.

 

Technologies

Core Stack:

 • AI/LLM: OpenAI SDK, prompt engineering & optimization
 • Backend: Node.js, TypeScript, Effect (functional TypeScript)
 • Cloud: AWS (Lambda, DynamoDB, SQS, SNS, SES, CDK)
 • Integrations: Google APIs (Gmail, Calendar), Microsoft Graph API, Zoom API • Testing: Vitest
 • CI/CD: GitHub Actions, pnpm
Note: The above technologies reflect our current stack. The team has the autonomy to make technology choices that best serve our AI-native product goals. You will be involved from the architecture and technology selection stage.

 

Key Responsibilities

  • Design, build, and operate AI-powered systems leveraging large language models (LLMs), including prompt engineering, output parsing, and evaluation pipelines
  • Architect event-driven workflows (Lambda, webhooks, queues) that enable AI-powered features to operate reliably at scale
  • Collaborate closely with product, sales, and CS teams to translate business needs into effective AI-driven product features
  • Own the full lifecycle of AI-powered products — from prototyping and prompt tuning to production deployment and monitoring
  • Evaluate and integrate emerging AI capabilities (models, APIs, tooling) to continuously improve product and model performance
  • Contribute to engineering best practices through code reviews, documentation, and knowledge sharing

 

Must Have

  • 4+ years of software engineering experience in product development
  • Hands-on experience building applications that integrate LLMs (e.g., Claude, GPT) — including prompt design, tuning, and output evaluation
  • End-to-end engineering experience from design and development through to production operation
  • Solid backend engineering skills (Node.js/TypeScript preferred)
  • Experience with event-driven or serverless architectures (Lambda, webhooks, message queues)
  • Strong communication skills and comfort working with cross-functional stakeholders
  • Business-level proficiency in both Japanese and English (for Japanese, a JLPT N2 or higher certification is required)
  • Passion for continuous improvement and staying current with the rapidly evolving AI landscape

amptalk's mission is to maximize the time people spend with each other and to create opportunities that did not exist in the world until today.

They aim to create a society where people can live more efficiently by accomplishing tasks that humans alone can not do.

amptalk develops and markets products that allow users to focus more on high-level sales activities and accelerate sales generation through the use of voice recognition and various AI technologies. They hope to help create more opportunities in the world by developing these efficient and effective sales tools.

amptalk’s mission is to create "a world where people are empowered around conversations”.

They are creating a world where each and every person is empowered by using software to streamline and eliminate unnecessary tasks, and by using software to do what people have been unable to do until now. Conversation accounts for a large percentage of people's lives in society, and the concept of negotiation is not only used in business negotiations, but also in all aspects of human life, including romantic relationships. Yet, many aspects of conversations have not been given much opportunity to be reevaluated. amptalk presents such opportunities through developing software to create a world in which each individual is empowered and all users are happy.

Why amptalk - "An exceptional team with a deep understanding of pain points"

amptalk is a product-driven team that respects each other and is committed to excellence. They are a team of people who respect each other and are committed to being the best. They work in a diverse environment of nationalities and languages, unlearning from past experiences and sometimes using them as ideas to provide innovative solutions for their users and to make the world a more amazing place. amptalk focuses on creating products that solve problems by removing the focus from unnecessary and uninspiring tasks.

 

MISSION, VISION, and VALUEs

MISSION - Maximize the time people spend with each other. The responsibility of sales and other customer-facing positions is to determine how much time they can spend with customers in a higher-quality manner. amptalk will unlock sales operations to maximize the amount of time spent talking to customers, and minimizing all the peripheral operations and communication barriers that are preventing the forementioned.

VISION - To create opportunities that didn't exist yesterday. The world is losing countless opportunities due to the inefficiencies of conversations and human behavior. By streamlining all sales-related tasks, such as training and administrative work, amptalk will create opportunities that didn’t have the chance to exist before.

 

VALUES

GET IT DONE

The best people are those who take initiative and execute. Ideas and theories alone accomplish nothing. Don't be a critic. Act first, instead of overthinking.

 

EXTREME OWNERSHIP

Let's stop drawing lines based on roles or titles. Break down barriers and treat everything as your own responsibility. Treat problems happening elsewhere as your own, and step outside the box to challenge yourself if it helps the team move forward.

 

EXPLORER

In a rapidly changing world, we applaud those who have a proactive spirit of exploring and taking on new challenges, and are always eager to try new things.

 

GIVE FIRST

Do good without expecting anything in return. Acting bases on short-term gains alone won't lead to real change. Put yourself in the shoes of society, our customers, and others, and act on what truly matters.

 

Service
amptalk analysis - A tool for analyzing phone calls and business meetings
Linking with all communication tools such as IP phones and video conferencing systems, amptalk analysis automatically transcribes, summarizes, and analyzes business negotiations and calls and automatically outputs the results to Salesforce / HubSpot / Slack / Microsoft Teams chat. This automated and visualized online negotiation process is available for both online and offline business meetings.

amptalk coach - An AI role-playing tool for rapid sales performance improvement
This AI-powered role-playing tool is designed to train sales professionals. It leverages AI to learn from sales materials and case studies, allowing users to practice sales conversations interactively. This helps new and junior employees quickly gain practical sales knowledge, learn autonomously, and apply their skills, essentially serving as an AI manager for speedy and realistic sales training.

View amptalk's company page

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Sr. Software Engineer at amptalk
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