Senior Backend Engineer — Building Energy Markets

Description

Seeking a seasoned Backend Engineer to architect scalable, high-performance systems for Japan's energy infrastructure. You will manage complex domain challenges and contribute to technical leadership across a growing organization.

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Products

• eSquare: Trading Platform
  Japan's first full-scale trading platform enabling online buying and selling of energy.

• eCompass: Market Data Platform
  A data platform providing critical energy and market information for power trading.

• eScan: Market Risk Management Tool
  An ETRM system specialized for Japanese electricity, visualizing business risks from transactions and market data.

• JCEX: Environmental Commodities Exchange
  A marketplace for domestic environmental commodities and overseas voluntary credits to support carbon neutrality.

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Backend Challenges

• Domain-driven design and architecture anticipating system scaling
• Building systems with high security, availability, and performance suitable for national infrastructure
• Navigating complex energy domains in close communication with domain experts
• Developing management structures and fostering people development in a tech organization of 50+ members

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Job Responsibilities

• Design and deliver resilient electronic trading services for reliability and low-latency, with automation on cloud-native infrastructure
• Develop and operate core platform components: exchange services, clearing workflows, APIs, connectivity solutions, developer tooling
• Build data pipelines and services for ingesting, analyzing, transforming, and publishing market/trading data with auditable governance
• Architect for reliability and performance; automate provisioning, deployment, and operation
• Conduct code reviews, share best practices, and mentor junior engineers

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AI Tools in Use

• NotionAI
• OpenAI
• Claude
• Gemini
• NotebookLM
• CURSOR
• Devin

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Requirements & Preferred Experience

• Experience with GCP/GKE
• Experience in collaborative coding with multiple AI agents

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Ideal Candidate Profile

• Resonates with the mission of "Building Energy Markets, Coloring Our Society" and collaborates with a purpose-driven mindset
• Focuses on delivering significant team results
• Prioritizes work to maximize business impact
• Takes ownership and proactively delivers projects end-to-end
• Open to differing opinions; expresses views logically and constructively
• Willing to acquire deep domain knowledge of Japan's energy market

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Working Conditions

Salary

• From 13,000,000 JPY annually
• Stock options offered

Location

• Tokyo Office (Minamiaoyama, Minato-ku)
• Remote work possible; no required in-office days

Job Type

• Full-time employee

Work Hours

• Full flex-time system (no core hours; standard 8 hours/day)

Holidays & Time Off

• Weekends and public holidays off
• 10 days paid leave (per Japan's Labor Standards)
• 5 consecutive "yohaku" (refreshment) days off
• 5 sick leave days

Probation Period

• 3 months (same conditions as full employment)

Benefits

• Full social insurance coverage
• Transportation allowance (up to 50,000 JPY/month)
• Full coverage for books
• Remote work subsidy
• Company housing system
• Life event support (maternity/childcare leave, celebration payments, special leave)
• Skill improvement/training subsidy
• Annual company trip
• Office convenience store, etc.