Senior Software Engineer (Python/Web Dev)

About HENNGE

HENNGE is a B2B SaaS company based in Tokyo Japan, and we are at the forefront of the changing workplace. HENNGE One, one of the top cloud security services in Japan, allows customers to adopt flexible work environments and safely harness the power of the cloud from any location. With cloud security ensured, employees are free to focus on working smarter, improving quality, and achieving business results. For further details regarding the engineering teams, products, and more, please visit this link.

Position

We’re looking for a senior software engineer to take ownership of backend and web-platform development. You’ll join the Access Control Team, responsible for HENNGE One Identity Edition, part of the HENNGE One suite serving over 2.8 million users. Your work will focus on developing core features like Access Control, Single Sign-On, and Secure Browser to deliver secure and seamless access experiences for enterprises. We value engineers who are flexible and open to new challenges, with opportunities to move between teams and products through two-way discussions that support your growth and the company’s goals.

Tech stack:

Tornado, FastAPI, DynamoDB, PostgreSQL, AWS

What you'll do:

• Design, build, and maintain new features for HENNGE One, using Python and other web technologies.
• Architect scalable, fault-tolerant services deployed in cloud environments.
• Automate deployment, testing, monitoring and documentation via CI/CD pipelines and infrastructure-as-code.
• Collaborate closely with Product Management, Design, and Customer Success teams to deliver high-quality user experiences.
• Participate actively in code reviews, discussions and technical decision-making.
• Mentor junior engineers, and contribute to improving team processes and engineering culture.

Your qualification

Minimum qualifications:

• 5+ years of experience developing production-scale web applications using Python.
• Ability to mentor junior engineers and work collaboratively in a team environment.
• Hands-on experience with cloud infrastructure (AWS, GCP or Azure) and distributed system concepts.
• Experience with CI/CD, automated testing, code documentation, and clean-code practices.
• Fluency in English (Japanese is not required), equivalent to CEFR B2 level or above (e.g., TOEIC 785+).
• Interest in contributing to open-source projects or participating in the tech community.

While not required, we'd love to hear if you have:

• Degree in Computer Science or other related technical fields.
• Experience building large-scale distributed systems or SaaS products.
• Knowledge of web-security, access-control, email-or-storage-systems domains.
• Knowledge of DevOps tools and practices (CI/CD, Infrastructure as Code).
• Knowledge of Linux / MacOS / Unix-like environments.
• Team leadership experience.

What we offer

Work style & employment details

Work style
Flexible working hours with a designated core time (11:00-16:00), allowing you to organize your day effectively. Employees typically work 8 hours per day with a 1-hour break.

Employment type
Permanent employee.

Place of work
Tokyo, Japan — Shibuya Headquarters.

Compensation
Annual salary: JPY 8.5M to 12.5M (includes English Allowance and Physical Communication Bonus)

Please refer to our Company Introduction Deck for an explanation of our Assessment System and the Belt System, which we use to determine the candidate's salary range: https://speakerdeck.com/hennge/company-introduction-deck-hennge

Benefits

• English allowance and advanced language expert allowance: JPY 10,000 ~ JPY 130,000 per month, paid alongside base salary, if the employee fulfills the requirements.
• Physical communication bonus: JPY 4,000 per day* for coming to the office and interacting with other employees, paid out as bonus according to the number of days. Details will be provided at the offer meeting.
• Transportation allowance (maximum of JPY 35,000 per month).
• Employee stock ownership plan.
• Insurance: Health, Employment, Industrial Injury, Welfare pension.
• Opportunities to attend international and domestic conferences.
• Financial support for technical certifications and technical learning programs.

Reasons why you will enjoy working at HENNGE:

• We celebrate diversity

  Join a vibrant team from over 20 countries, united by a love for technology and Japanese culture. Located in Shibuya, Tokyo, we offer a dynamic, non-traditional work environment in one of the world's most exciting cities.

• Smooth Japan relocation

  We make your move to Japan smooth and stress-free. We provide comprehensive support such as flight tickets, visa sponsorship, and Japanese lessons, to ensure a smooth onboarding process for our new hires, ensuring a seamless transition and a warm welcome for all candidates.

• Balanced work life

  Work-life balance is highly valued at HENNGE, and lots of fun happens at our office! 200+ of social channels in our Slack, from weekly board game nights to snowboarding club, internal and seasonal events, monthly tech sessions with beer bashes, attendance of international tech conferences, and more. Employees have access to a flexible working hours system (with core working hours) to accommodate their preferred working style.

• Passion for technology

  Our CEO, also serving as CTO, actively leads product development, fostering an environment of innovation and support. Having a leader who truly understands and is still involved in the tech side of the business makes for an exciting and supportive environment for engineers.

• Collaborative teams

  Work in autonomous teams where your decisions shape our services. Influence every aspect of our products, from UX and architecture to development and deployment, in an agile and collaborative setting.

   

  Be part of a diverse and innovative team at HENNGE, where your passion for technology and desire to make a difference are valued and celebrated. Ready to change and challenge the status quo with us?

Additional details

To learn more about life at HENNGE, please check these two links:

• Life at HENNGE
• Stories from our employees

Selection process

1. Solve our coding challenge by clicking the button below. You will receive an email with our guidance upon your submission, and there is no time limit to finish the challenge. Please note that your application will be automatically rejected if:

• you have fewer than five years of professional Python experience, and/or
• you complete the coding challenge using a programming language other than Python.

2. Once you finish the coding challenge, follow the instructions to upload your CV and Cover Letter. Please check our guide on how to prepare them here.

3. Casual interview with our HR.

4. 2 (or 3) interviews with our engineers (no live coding).

5. Interview with our CEO.

We value your time and want you to perform at your best, so the coding challenge will be the only technical assessment in the process. There will be no live coding sessions.

Have more questions? Please consult our FAQ here.