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Backend Engineer

8M JPY - ***M JPY

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Kanagawa

Full-time (permanent)

Online Interview: Yes

Remote Work from Overseas: Yes / Remote Work in Japan: Yes

Top-Selling Points

Rate of Foreigners

Less Than

Frequency of English Usage

Less Than

International employees Apply from overseas

Related Skills

Programming Language

Go Python Java

Language Requirements

Required

Preferred

Job Description

[Role overview]
As a Backend Engineer, you will be responsible for the control-plane and gateway layer that 
connects the customer to our compute serving infrastructure. You will build and power the 
customer request lifecycle end to end, including handling requests via Cloudflare worker nodes, 
managing authentication and tenancy, validating requests, routing to the correct model 
endpoints, enforcing quotas and rate limits, and implementing reliability mechanisms to ensure 
platform stability under load. This layer is also key to achieving significant service performance 
latency through optimization. The goal is to build a backend that is fast, secure by default, 
abuse-resistant, and highly operable at scale.
You will collaborate with the application and platform teams on developing the backend 
architecture. We expect you to be a central, hands-on contributor to the code stack, driving both 
the building and technical decision-making as an expert from the ground up. You will work 
closely with the President and engineering leadership on backend routing decisions that 
accurately reflect real capacity and failure domains, and ensure the system provides the 
necessary telemetry for rapid debugging.


[Responsibilities]
● Architect Authentication & Billing: Build the OAuth/Billing layer, ensuring seamless 
tenancy management. You are responsible for Metrics & Billing Database, ensuring that 
every token is logged and billed. 

● Manage the Control Plane: Engineer the backend services that handle user flows, API 
key generation, and workspace management. You ensure this layer remains highly 
available and decoupled from the high-traffic data plane. 

● Data Persistence & Integrity: Manage the storage of data and design schemas that 
can ingest high-velocity telemetry from the edge without becoming a bottleneck. 

● System Observability: Build the telemetry pipelines that aggregate logs from the Edge 
Gateway. Provide the tools that allow the team to debug why a specific routing decision 
was made or why a specific rate limit was triggered. 

● Business Logic Implementation: Translate complex business requirements (customer 
tiers) into technical configurations that the Edge Traffic Engineer can enforce. 

● API Design: Design and maintain the internal and external APIs that allow customers to 
programmatically interact with their accounts and settings.

Required Skills and Experiences

[Requirements] ● Robust Backend Architecture: extensive experience with AWS ecosystems and server-side languages (Go, Python, or Java). You excel at building services that require high data integrity. ● Database Expertise: Strong proficiency in SQL and NoSQL database design, specifically for time-series data (metrics) and transactional data (billing/ledgers). ● Auth & Identity: Deep understanding of OAuth2, OIDC, and secure API key management lifecycles. Scalable API Development: Experience building REST or GraphQL APIs that serve as the control interface for complex infrastructure. ● FinOps/Billing Systems: Prior experience building usage-based billing systems or credit ledger systems.

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Working Condition

[Employment Type]
Permanent employee. Probation period: 3 months.

[Work Location]
■Address: 10F Queen's Tower A, 2-3-1 Minatomirai, Nishi-ku, Yokohama-shi, Kanagawa 220-6010
■Access:
7-minute walk from Sakuragicho Station (all lines).
Directly connected to Minatomirai Station (Minatomirai Line / Tokyu Toyoko Line).
■Smoking Policy: No smoking allowed on the premises (Entirely non-smoking).
■Scope of Change in Workplace: Any workplace designated by the company.
■Transfer/Secondment: None (No relocation or external secondment required).

[Expected Annual Salary]
Annual Salary: JPY 8,000,000 – 14,000,000
Monthly Salary: JPY 666,000 – 1,166,000
*Base Monthly Salary: JPY 666,000 – 1,166,000
■Salary Increase: Available (Based on performance review)

[Working Hours]
・Working Hours: 09:00 – 18:00
・Break Time: 60 minutes

[Benefits and Welfare]
Commuting Allowance: Partially covered (Up to JPY 15,000 per month). / Social Insurance: Fully covered (Health Insurance, Employee Pension, Employment Insurance, and Workers' Accident Compensation Insurance). / Overtime Pay: Paid according to actual overtime hours worked.

[Holidays and Leave]
Annual Holidays: 120 days / Five-day Workweek System / Annual Paid Leave: 10+ days (Starting from the 7th month of employment)

RECRUITMENT PROCESS

HR interview ⇒ departmental interview ⇒ technical interview ⇒ final interview ⇒ offer
*The number of times and content of the selection process (live coding, etc.) are subject to change depending on the situation.

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