C# Full Stack Software Engineer – E-commerce Systems

Osaka
November 21, 2025
Full Time

Job Description

C# Software Engineer – Full Stack Developer (E-commerce Systems)

C# Full Stack Software Engineer (Osaka, Chuo-ku) C#フルスタックソフトウェアエンジニア（大阪・中央区）

Location: Osaka, Japan
Posted on: November 21, 2025
Employment Type: Full-time (3-month trial period, salary/benefits unchanged)
Company: ZenGroup Inc.

Job Description

Join ZenGroup’s IT team to develop and maintain cross-border e-commerce platforms. This role involves API integration with payment gateways and logistics services, database management, and creating visual reports.

Key Responsibilities:

  • Develop and maintain cross-border e-commerce websites
  • Integrate payment systems (credit cards, PayPal, digital wallets) via APIs
  • Connect logistics applications through API integration
  • Extract and process data from databases for reports (tables, graphs)
  • Manage inventory integration with external platforms via API

Requirements:

  • 3+ years of software development experience
  • Strong C# and .NET framework skills (.NET 6+)
  • Full-stack development experience (front-end + back-end)
  • Proficient in JavaScript and SQL (MSSQL or other relational databases)
  • Solid OOP and design pattern knowledge
  • Familiar with Agile/Scrum methodologies
  • Ability to write clean, maintainable code
  • English business-level (TOEIC 735–860)
  • Japanese business-level (JLPT N2+)

Working Hours:

  • Core time: 10:00–16:00
  • Flexible time: 07:00–10:00 & 16:00–19:00
  • Standard: 9:15–18:15 (8-hour day with 1-hour break)

Compensation & Benefits

  • Annual Salary: ¥5,500,000 – ¥7,000,000 (~¥420,000–¥500,000/month)
  • Bonuses: Twice annually (June & December)
  • Annual salary review
  • Transportation allowance (up to ¥30,000/month)
  • Full social insurance
  • Overtime pay per-minute
  • Relocation support (up to ¥100,000 for moves over 60 km)
  • Casual dress code & personal freedom (hairstyles, piercings, tattoos allowed)
  • Free beverages
  • Side jobs permitted
  • Company clubs & events (optional)

Holidays & Leave:

  • 2 days/week (Sat & Sun)
  • Year-end/New Year holidays
  • Paid vacation: 10 days upon joining, 16 days after 6 months
  • Bereavement & celebratory leave
  • Maternity & childcare leave

Work Location & Access

ZenGroup Head Office
Osaka Sakaisuji L Tower 8F/10F, 1-7-7 Kawaramachi, Chuo-ku, Osaka City, Osaka Prefecture

  • 5-min walk from Sakaisuji-Hommachi Station or Kitahama Station (Osaka Metro)
  • Bicycle commuting available (prior consultation required)

Location

Photos

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