Recruiting embedded RTOS development engineers | In-house product development × Flexible working style × Annual salary 5 to 8 million yen

■Resume and work history written in Japanese are required (There is a possibility that your application will not be processed if you only have English documents).
■We are a recruitment agency conducting this recruitment on behalf of the companies seeking employees.
■ The required Japanese level is conversational or above.
■Required:
- C programming language development experience (approximately 3 years)

【Full-time｜Tokyo】Embedded RTOS Development Engineer
Annual salary: ¥5M–¥8M｜In-house product development｜Flexible work style｜Remote work available

Join a team leading the industry with a high-performance, lightweight real-time operating system (RTOS).
From smart appliances to medical devices and industrial IoT—play a key role in developing embedded technologies that support our daily lives and infrastructure.

◆ Company Highlights｜A compact yet powerful team leading embedded tech innovation
Established in 2006, this agile company of just 20 employees operates with a capital of ¥10 million. Despite its size, its in-house developed real-time OS “μC3” and TCP/IP stack “μNet3” have been widely adopted across various sectors including home appliances, medical, and industrial IoT devices.

With a flat organizational structure and high development freedom, engineers can make a real impact on product evolution.

◆ Job Description｜Be at the core of essential embedded technology
As a key engineer, you’ll be responsible for enhancing our core products, “μC3” and “μNet3.” Your tasks will include:

Porting the in-house RTOS to new CPUs

Developing device drivers

Customizing software for client needs

Providing technical support and handling inquiries

Designing and implementing new features and products (e.g., for IoT appliances)

Each project is run by a small team (1–3 members) and completed within 1–3 months, allowing you to see results quickly and grow rapidly as an engineer.

You’ll feel the impact of your work in real-world systems that matter.

◆ Work Environment｜Freedom to focus on what matters most—engineering
Casual dress code: Work comfortably in a relaxed environment

Flextime system: Core hours 10:00–15:00, 7.5 hours per day

Less than 10 hours overtime per month

Remote work available｜No transfers｜Tokyo (Chuo-ku) office

◆ Compensation & Benefits｜Strong support for long-term career stability
Annual salary: ¥5M–¥8M

Monthly salary: ¥250,000+ plus bonuses (2–6 months/year)

Full social insurance coverage, full transportation reimbursement

Paid leave, birthday leave, condolence leave

Golden Week, summer (5 days), and year-end (3 days) holidays

Maternity/paternity leave (with track record)

Optional company trips

◆ Career Growth｜Expand your possibilities as an engineer
Work directly on core product development

Contribute to new product launches for emerging IoT needs

Share ideas on technology and specs in a flat team

Join a diverse, international team of developers

◆ Ideal Candidate Profile
Experience in embedded software development (C, C++, RTOS preferred)

Knowledge of TCP/IP stacks and driver development is a plus

Able to communicate and work proactively within the team

Capable of working in Japanese (foreign nationals welcome)

◆ Job Details
Employment Type: Full-time (permanent)

Probation: 6 months (no change in conditions)

Location: Chuo-ku, Tokyo｜Remote work available｜No transfers

For those searching for “SaaS engineer job,” “Embedded Engineer Tokyo,” or “Cloud development position”
If you’re seeking a workplace where you can take ownership of your code and develop impactful, real-world products—this is your chance.
Join us at the forefront of RTOS and IoT evolution.
Apply now and take your engineering career to the next level!

〒150-0043　渋谷区道玄坂2-23-14　道玄坂225ビル8Ｆ (地図)
TEL: (+81) 03-6455-0360    FAX: (+81)03-6455-0361