Backend Engineer

  • Remote OK - Anywhere in Japan
  • Full-time
  • May 3, 2024
6,000,000 - 15,000,000 JPY /yr
Apply from Japan Only
No relocation to Japan
(No visa sponsorship from overseas)
Language Requirements
Japanese: Business Level
English: Business Level
Minimum Experience
Mid-level or above


Acompany is a privacy tech company well-versed in privacy protection technologies and personal information.

We has independently developed technologies that combine mathematics, cryptography, and law, and offers "AutoPrivacy," a data clean room construction platform, as a service to businesses holding large-scale data, including major domestic companies.

Through "AutoPrivacy," it enables safe and flexible data collaboration between multiple businesses by integrating privacy protection technologies such as secure computation and federated learning. After conducting pilot tests with multiple partner companies, it began offering full-scale services in August 2023.


Technical Features of the Product

  • Privacy protection technologies (such as secure computation, differential privacy, and federated learning) are available in the cloud.
  • Capable of processing and coordinating table data ranging from tens of millions to hundreds of millions of records per customer.
  • Advanced security levels required by major corporations.
  • Highly flexible workflow and permission management features.


Technical environment

  • Product development
    • Language: C++, Go, Python, TypeScript, React, Next.js, Remix
    • Environment: FastAPI, Hasura, PostgreSQL, Argo Workflow, Google Compute Engine, Google Kubernetes Engine, Cloud Run, Google App Engine, Cloud SQL, AWS EC2, AWS Fargate, Azure VM, Azure Kubernetes Service, gRPC, GraphQL
  • Core technology development(R&D)
    • Language: C++, Python, Julia
    • Environment: gRPC, Bazel
  • Infrastructure
    • CI: GitHub Actions
    • Monitoring Platform: Prometheus, Grafana, Loki, Thanos, Uptime Kuma
    • Environment Configuration: Docker Compose, Kubernetes, Docker, Terraform
    • Infrastructure: GCP, AWS, Azure, On-premises (in-house GPU environment)
  • Other tools
    • Source Code Management: GitHub
    • Documentation: Notion, GitHub
    • Communication: Slack, Discord, Figma


Job Descriptions

  • Designing, developing, and operating the backend of AutoPrivacy to scale flexibly in response to business growth
  • Custom development and operation according to customer needs

(Note: Currently, Acompany's language environment is primarily Japanese)


Required Skills


  • Back-end development experience using statically typed languages (Go, Java, Rust, TypeScript, etc.)
  • Experience developing and operating web services using cloud infrastructure (AWS, GCP, Azure, etc.)
  • Experience in one or more of the following
    • Experience leading the launch and release of a commercial web service
    • Experience leading a development team as a playing manager
    • Experience leading a team as a product manager
  • Communication skills in Japanese: Business level or above



  • Experience in Go, Python, or C++ development
  • Back-end development experience in products/systems that require fast and reliable processing of large amounts of data, such as ad technology and large-scale services
  • Experience in back-end development and operation for large companies that require a high level of security
  • Experience running container orchestration tools such as k8s in production
  • Award-winning experience in ISUCON (a programming contest focused on improving system performance)
  • Knowledge of data warehousing, data cleanrooms, BI tools (and related products, SaaS development)


Ideal Candidate Profile

  • Individuals who resonate with the values of "Be Cool, Be Hacker."
  • Those who have transitioned from developing services for major corporations to working in ventures or startups, but are still seeking an environment where they can challenge themselves even more.
  • Individuals who want to leverage their experience in both B2C and B2B service development to tackle technically and business-wise challenging product development.


The Appeal of the Job

Entering a Phase that Accelerates Business Growth!

The foundation of our business in terms of core technology, capital, and customer base is becoming solidified.

  • Success in inventing and modularizing core technology through R&D
  • Completion of fundraising totaling 790 million yen through Series A shares + loans
  • Successful customer acquisition of major companies such as Hakuhodo and CTC

Privacy protection is indispensable for data collaboration between companies, and the larger the company, the more interest they have shown in our AutoPrivacy. Right now, initial market needs are emerging, and our product is starting to grow.

Would you like to join us in tackling the market for privacy protection and data collaboration?


Customize Your Work Style with Full Remote & Flex!

Members are thriving from Hokkaido in the north to Okinawa in the south, all working fully remotely.

With a flex system that allows for flexible working hours from 5 AM to 10 PM, except for the core time from 1 PM to 4 PM, it has become easier to balance work with family and hobbies.

Except for once every four months (three times a year) when we align the company's direction at an offsite meeting, full remote work is possible.

Acompany is a privacy tech company that specializes in technology and risk analysis concerning privacy.

The privacy tech in which Acompany excels includes technologies designed to protect individual privacy, such as enabling computations on encrypted data. We offer a service called "AutoPrivacy", which is a Data Clean Room service.

View Acompany's company page

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