Full Stack Software Engineering Internship (Onsite Tokyo, Japan)

HENNGE’s Global Internship Program (GIP) is an on-site software engineering training program designed and run by HENNGE, a cloud security company based in Tokyo. The program is created for students and early-career engineers who want to strengthen their full-stack engineering skills in a global, English-speaking environment at HENNGE’s Shibuya office.

This Full-Stack Pathway focuses on hands-on application development training across back-end, front-end, and basic DevOps, using Python (non-ML stack), Go, or TypeScript on the back-end and TypeScript with modern front-end frameworks on the front-end. The program emphasizes fundamental engineering skills, problem-solving, explanation, and collaboration, rather than production work.

Japanese is not required.

If you are interested in HENNGE’s GIP: Front-End Engineering Pathway instead, please check it out here:
https://japan-dev.com/jobs/hennge/hennge-front-end-engineering-internship-onsite-tokyo-japan-8lbfyd

What You’ll Learn & Practice

During the program, you will:

• Develop full-stack web applications as part of structured training projects

• Build and connect back-end APIs and services with front-end applications

• Practice key full-stack engineering concepts, including:

• Back-end logic and API design

• Front-end state management and data flow

• Authentication and security basics

• Software testing (unit, integration, end-to-end)

• Learn, at a practical level, how front-end, back-end, and cloud infrastructure interact

• Work with Unix-like environments and basic DevOps tooling

• Explain your technical decisions, trade-offs, and problem-solving approach during discussions and reviews

• Receive feedback from mentors and iteratively improve your implementation

Our Stance on AI and Software Engineering

AI tools can be helpful, but the goal of HENNGE’s Global Internship Program (GIP) is to help you build strong software engineering fundamentals.

To support that learning, we ask you not to use AI tools to generate code for training assignments or solution implementations. The code you submit should be written by you and reflect your own understanding.

You may use a designated AI service to support your learning in non-code-generating ways, such as clarifying technical concepts, understanding documentation, or helping with non-essential tasks (for example, command-line options). 

Throughout the program, you’ll be expected to take ownership of your code and clearly explain your thinking, trade-offs, and design decisions. In this learning environment, you are the engineer and the final gatekeeper of quality.

Program Structure

• Weeks 1-4: Full-Stack Application Development Project

• Week 5: DevOps & Infrastructure Project

Internship Details

• On-site program at HENNGE’s Shibuya office (Mon–Fri, 10:00–19:00 JST)

• Mentorship and technical discussions with engineers based in the same office

• English is the primary language used throughout the program

This program is not remote. Participants are expected to attend on-site.

Benefits 

• Round-trip airfares from and back to your country of residence

• Pre-arrival support and visa guidance

• Medical insurance* and a phone with mobile data will be provided during your internship in Tokyo, Japan**

• Up to 150,000 JPY of monthly subsidy to cover accommodation, meals, transportation, and networking activities

• Subsidized company events on top of monthly subsidy (Monthly Technical Sessions, Board Game Night, Get-to-know-you Lunches, and many others!) to get to know teams across divisions

• Access to online learning platform during the internship period

* Medical insurance will only be provided to interns who do not reside in Japan

** This internship is an unpaid training program with a subsidy provided to all interns

Essential Qualifications

• Third-year undergraduate or higher (including Master's and Doctoral students). Recent graduates are welcome to apply

• Pursuing or holding a degree in Computer Science or a related field. If not, equivalent experience from a tech internship or bootcamp is expected

• Fluency in English (Japanese not required)

• Proficiency in Python, Go, or React/Vue in TypeScript

• Knowledge of Linux / MacOS / Unix-like environments

• Interested in open source or tech community activities

• Interested in pursuing a career in Japan

At least meet three of the following:

• Experience in cloud computing platforms, especially AWS

• Experience in full stack web application development

• Knowledge of distributed systems

• Knowledge of DevOps tools and practices (CI/CD, Infrastructure as Code)

• Knowledge of Container technology (e.g. Docker)

More details about the technology stack for this internship program:

https://stackshare.io/hennge/hennge-global-internship-program

Our Ideal Candidate

Our ideal full stack engineering intern is a curious problem-solver who’s excited to build real-world applications and grow in a fast-paced tech environment. We’re especially interested in candidates who:

• Are proficient in Python, Go, and React/Vue in TypeScript

• Are comfortable working in Unix-like environments

• Have a solid grasp of both front-end and back-end development

• Have an interest in cloud computing and DevOps practices

• Are passionate about learning, contributing to tech communities, and possibly pursuing a career in Japan

Bring your curiosity, versatility, and drive—we’re excited to see what you can build with us.

Internship schedule

We open batches multiple times a year.

Available batch (as of Feb 20)

• Batch 3 (2026): Jun 1 - Jul 10 (6 weeks)

• Batch 4 (2026): Aug 3 - Sep 11 (6 weeks)

How to apply

• Register through the apply button below and verify your email address.

• Solve the coding challenge and submit your work with your CV and cover letter.

• An HR interview, followed by a final interview, will be given to those who pass Step 2.

Before you apply: Your CV and cover letter are your chance to show us your story. Clear, thoughtful explanations of your experiences will make your application stronger, while generic submissions may not fully reflect your potential.

We suggest reviewing this guide to help you present your best self:

https://hennge.com/global/info/henka/interview/202403-crafting-the-perfect-cover-letter/

Notice for Applicants

• A limited number of internship slots are available. Applications will be reviewed as they are received, and positions will be filled on a first-come, first-served basis. We encourage you to apply early, as applications will close once all positions are filled.

• The coding challenge has no time limit, and the screening process will not consider solving time. Please note that the application is completed after uploading application documents and filling in the batch preferences.

• Please take another challenge if you are (also) interested in applying for HENNGE’s GIP Front-end Engineering Pathway. Please use different emails to sign up if you apply for both internships.