【Tokyo】TECH-ENG-26.Full Stack Engineer (Bilingual –Japanese)

At Mico, we provide Mico Engage AI, a high-traffic, enterprise-grade SaaS platform used daily by major corporations — and we’re now seeking core members to join our growing team.
In our fast-paced startup environment, you’ll have the opportunity to shape and refine the product with your own hands, continuously improving the user experience.

You’ll be expected to take ownership of a wide range of technical challenges — from optimizing high-traffic systems and designing AI-powered features, to enhancing real-time processing infrastructure. Working closely with the Lead Engineer, you’ll play a central role in driving development that directly contributes to the product’s growth, while also participating in technical decision-making and standardization efforts.

In addition, by collaborating in a multicultural, bilingual team, you’ll be able to hone your skills in both Japanese and English within a truly global development environment. This position offers not only hands-on development opportunities but also the chance to make meaningful contributions to both team and product growth.

◼︎ Key Responsibilities

As a Full Stack Engineer, you will play a key role in the Mico Engage AI development team. Specifically, you will be responsible for:

• Stabilizing Mico Engage AI’s delivery infrastructure – developing infrastructure that ensures reliable performance even for clients with a large user base.

• Developing new features in line with the product roadmap to enhance overall product value.

• Customer-driven development – implementing highly requested and broadly applicable features based on feedback from customer success activities.

• Continuous improvement – addressing product backlog items, enhancing UI/UX, and promoting better Developer Experience (DX) through proactive improvements.

◼︎ Tech Stack

• Web Backend: TypeScript (NestJS), Go, Elixir
• Web Frontend: TypeScript (Next.js), Chakra UI
• Databases: TiDB, Aurora MySQL, DynamoDB, MemoryDB for Redis, Snowflake
• 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 Analytics: BigQuery, Google Data Studio, Google Analytics, Metabase, Trocco
• Environment Setup: Docker
• CI/CD: GitHub Actions, Amplify Hosting
• CDN: CloudFront
• Source Control: GitHub
• Communication Tools: Google Meet, Slack, Notion, Redmine, Jira, ClickUp

◼︎Employment type
Full-time employee
Probationary period:Generally 3 months (no changes in compensation or benefits during this period).

◼︎Salary
Salary will be determined based on previous experience, taking into consideration your skills and expertise.

◼︎Work Location
- Your preferred work location will be discussed.
- Flexible work styles are available depending on job responsibilities (remote/on-site).
 
▪️Average On-Site Frequency
- About 4 days per month.

▪️Osaka Office
WeWork Midosuji Frontier 1-13-22 Sonezakishinchi, Kita-ku, Osaka-shi, Osaka Prefecture
 
▪️Tokyo Office
WeWork The ARGYLE Aoyama 6F 2-14-4 Kita-Aoyama, Minato-ku, Tokyo

◼︎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

◼︎Employee 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

MUST

• Extensive practical experience (around 5+ years) in developing medium to large-scale web applications
• Experience designing, implementing, and operating UI using React + Next.js
• Experience designing and operating scalable backend systems using Node.js + TypeScript
• Understanding of datastore design including RDB, NoSQL, and message queues
• Experience with DevOps practices utilizing CI/CD and Infrastructure as Code (IaC)
• Ability to conduct technical discussions and create documentation in both Japanese and English

Preferred 

• Experience leading improvements in development infrastructure, performance, and monitoring
• Experience designing and improving real-time processing for high-traffic systems
• Practical experience complying with security and privacy guidelines and regulations
• Track record of external contributions (OSS, conference presentations, technical blogging)

Ideal candidate profile:

• Ability to move forward from ambiguity and undefined situations with curiosity and drive
• Balances technical decisions considering short-term effort and long-term value
• Rapidly iterate on hypotheses and learn from failures
• Sets high standards through code and reviews, inspiring the team
• Identifies product challenges and follows through to completion
• Collaborates with multinational members and openly shares knowledge