S

Simplex Inc. Tech Stack

Financial services systems integrator expanding into cloud and AI consulting

IT Services and IT Consulting 港区, 東京都 1,001–5,000 employees Founded 1996 Public Company

Simplex is a 1,000+ person systems integrator founded in 1997, deeply rooted in Japanese mega-banks and securities firms but now scaling into insurance, public sector, and manufacturing. The tech stack (Java, Python, AWS, Azure, GCP with Terraform and CloudFormation) and active hiring across engineering and consulting signal a shift toward cloud migrations and DX work — a natural evolution from on-prem financial systems. The company also operates subsidiaries in AI (Deep Percept, established 2019) and consulting (Xspear, established 2021), reflecting a deliberate move beyond pure project delivery.

Tech Stack 27 technologies

Core StackJava Python AWS Terraform CloudFormation Datadog Flutter CircleCI Jenkins JavaScript C# Oracle PostgreSQL MySQL Linux TypeScript Vue React Azure GCP AWS CDK iOS Android Bitrise Teams Windows

What Simplex Inc. Is Building

◆Challenges

Digitalizing life casualty insurance
Expanding demand for large si projects
Digital transformation of insurance
Cloud-based service provision
Migrating on-prem to cloud
Infrastructure automation
Mission-critical system reliability
Cloud shift acceleration
Business process improvement for large financial institutions
It strategy for large financial institutions

▲Active Projects

Prime life and casualty insurance projects
Full cloud service provision for insurance companies
Smartphone app for individual investors
New security service development for internet transaction system
It strategy for large financial institutions
Security review for new customer system construction
Ec business growth strategy
Entertainment new business planning
Manufacturing data science dx support
Deep percept ai solutions

Hiring Activity

Accelerating30 roles · 20 in 30d

Department

Engineering

14

Consulting

10

Executive

2

Security

2

Data

1

Sales

1

Seniority

Mid

19

Senior

5

Junior

4

Lead

1

Manager

1

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About Simplex Inc.

Simplex delivers systems integration, cloud infrastructure, and digital transformation consulting to financial services, insurance, and public-sector enterprises across Japan. The company's core revenue historically came from large SI projects for banks and securities firms; current project activity spans full cloud migrations for insurers, app development for retail investor platforms, and security services for transaction systems. With 1,001–5,000 employees and a public listing, Simplex operates at the scale required for mission-critical deployments. Hiring velocity is accelerating in engineering and consulting roles, concentrated in Japan.

Headquarters港区, 東京都

Company Size1,001–5,000 employees

Founded1996

Hiring MarketsJapan

Frequently Asked Questions

What tech stack does Simplex use?

Java, Python, AWS, Azure, GCP. Infrastructure automation via Terraform and CloudFormation. iOS/Android and Flutter for mobile. CircleCI, Jenkins, Bitrise for CI/CD. PostgreSQL, MySQL, Oracle for data storage.

What is Simplex working on?

Life and casualty insurance digitalization, cloud service provision for insurers, investor mobile apps, internet transaction security services, IT strategy for large financial institutions, and AI solutions through subsidiary Deep Percept.