Bilingual Full Stack Lead（Tenant Team）

Tokyo
Partial Remote
Full-time
December 3, 2025

At Mico, we provide Mico Engage AI, a high-traffic enterprise SaaS platform used daily by major corporations, and we are currently looking for core team members. This is an opportunity to refine the product with your own hands and enhance the user experience in a fast-growing startup environment.

You will be expected to proactively tackle a wide range of challenges, including optimizing high-traffic systems, designing and developing new AI-powered features, and improving real-time processing infrastructure. This role allows you to work closely with lead engineers, drive development that directly impacts the product’s growth, and be involved in technical decision-making and standardization.

In addition, by collaborating within a multicultural and bilingual team, you will have the chance to hone your skills in a global development environment using both Japanese and English. This is a highly rewarding position where you can actively contribute not only to development but also to the growth of the team and the product.

Key Responsibilities

As a Full-Stack Engineer, you will play a central role in the development team for Mico Engage AI. Your work will include:

Stabilizing Mico Engage AI’s delivery infrastructure: Develop infrastructure that ensures stable delivery even for clients with large user bases.
New feature development: Build features according to the product roadmap to enhance product value.
Customer-driven development: Identify and implement features that are broadly useful and in high demand based on customer success feedback.
Continuous improvement: Respond to daily requests from new and existing customers, resolve product backlog items, improve UI/UX, and enhance and promote the Developer Experience (DX).

Tech Stack

Backend: TypeScript, React
Frontend: TypeScript (Next.js), Chakra UI, React Flow
Database: TiDB, Aurora MySQL, DynamoDB, Redis MemoryDB
Infrastructure: AWS (Cognito, EC2, ECS, Route53, Lambda, Kinesis Data Stream, Kinesis Firehose, SQS, SES, ElastiCache, RDS, CloudWatch, IAM, Audit, API Gateway, CodeDeploy), IaC (Terraform, AWS CDK)
Middleware: Nginx, Supervisor
Monitoring: NewRelic, Sentry, AWS CloudWatch
Data Analysis: BigQuery, Google Data Studio, Google Analytics, Metabase, Trocco
Environment Setup: Docker
CI/CD: GitHub Actions, Amplify Hosting
CDN: CloudFront
Source Code Management: GitHub
Communication: Google Meet, Slack, Notion, Redmine, Jira, ClickUp

Required Skills

5+ years of professional software development experience
Development experience using TypeScript and React
Full-stack engineering experience (both frontend and backend)
Ability to independently handle the full cycle from specification to release
2+ years of code review experience
Ability to implement test code to improve quality
Experience in making technology selection decisions
Business-level proficiency in both Japanese and English

Preferred Skills

2+ years leading development as a technical lead (team of 5+ members)
Experience leveraging AI efficiently to improve development speed and quality, and ability to document and share best practices
Next.js development experience
CI/CD setup experience
Infrastructure development experience (AWS, Docker, etc.)

Desired Traits

Able to move forward in ambiguous or undefined situations with curiosity and drive
Makes technical decisions balancing short-term effort and long-term value
Quickly runs hypothesis testing and learns from failures
Sets high standards through code and reviews and motivates the team
Identifies product challenges and sees tasks through to completion
Collaborates with multinational team members and openly shares knowledge

Work Location / Work System

Your preferred work location will be discussed(Osaka or Tokyo)
Flexible work styles are available depending on job responsibilities (remote/on-site)
Average On-Site Frequency: About 4 days per month

Work Hours

Standard Schedule: 9:00 AM – 6:00 PM (includes a 1-hour break; overtime applicable)
Flexible Time: Core hours from 10:00 AM to 4:00 PM
Certain grades may fall under a discretionary labor system, per company regulations

Holidays and Leave

Weekends (Saturday & Sunday), national holidays
Year-end and New Year holidays
Summer vacation
Bereavement leave
Paid leave (10 days granted upon joining, with additional days based on tenure)
Other company-designated holidays

Probationary Period

Generally 3 months (no changes in compensation or benefits during this period)

Benefits

Commuting allowance (including bicycle commuting)
Company laptop provided
Company phone provided (*role-specific)
Flexible start-time policy (every two months upon request)
Social insurance (health, pension, employment, workers' compensation)
Life and health support leave
Health checkup expenses covered
Parental and childcare support programs
Club activity support

Hiring Process

Document Screening
Casual Interview (Japanese Language Check)
First Interview
Second Interview
Reference Checks
Final Interview
Job Offer Meeting

*The hiring process is subject to change

APPLY NOW ➜Japanese Required ⚠️

About Mico

Mico's goal is to help companies build their brand through the power of conversation.

They are developing multiple products to analyze and improve communication between businesses and consumers, enabling businesses to optimize their online marketing efforts.

The conversational commerce (C-commerce) is a rapidly growing market, projected to surpass the e-commerce market in some countries by 2025.

Mico (formerly Micoworks) has already achieved 500% business growth in just two years, placing them at No.1 in LINE marketing within Japan. They’ve also secured a total of 6.3 billion yen in funding (with the recent Series B raising 3.5 billion yen).

Mico has set an ambitious goal to become Asia’s No.1 Brand Empowerment Company by 2030, with a clear vision for global expansion. Achieving this goal will require tackling numerous obstacles, and they’re looking for team members who are up to the challenge.

Here are the services you’ll be working on:

Mico Engage AI
A platform that enables seamless communication through message automation and deep integration with client systems.
Mico Voice AI
A service that enhances communication quality and efficiency using AI voice recognition, helping create meaningful connections.
BizClo
An enterprise messaging solution leveraging LINE, optimized for business use to improve customer relationships and internal efficiency.
Micomii
A LINE-based membership service for restaurants, enabling customer segmentation, rank-based perks, and digital coupons.

Why Work at Mico

Flexible work style: Hybrid work, flex time, and up to 6 Life-Health leave days per year to support diverse lifestyles.
Robust growth support: Subsidies up to ¥55,000/year for books and seminars, supporting personal skill and career development.
High transparency: Weekly TGIM meetings and quarterly company-wide updates to share vision and goals.
Leadership training: Strengthening team leadership and organizational management skills through training.
Fair evaluation system: OKRs-based performance reviews conducted semi-annually with continuous feedback.
Social impact: Contributing to clients’ business and workstyle transformation through innovative SaaS products.

Team Culture

Mico leadership and team embody an "OPEN MIND" approach, fostering open and inclusive communication across all levels.

Driven by a strong "ALL FOR ONE" spirit, team members work closely together, both internally and externally, with a "Giver Mindset" at the core of their collaboration.

Surrounded by highly motivated colleagues, you’ll find daily inspiration and opportunities for personal and professional growth.