Legacy Modernization, for systems your business still depends on.
Assess outdated, complex systems and modernize them into a maintainable, scalable, and secure IT foundation - from current-system inventory and planning to migration, rebuild, and long-term operation.
WHY MODERNIZATION NOW
A legacy system is not just old. It is a system that blocks change.
Many enterprise systems continue to run important business operations for years. The problem starts when the system becomes too complex to maintain, too risky to secure, or too expensive to change.
Older languages and frameworks
Systems built in COBOL, VB6, or outdated frameworks may become difficult to maintain as available engineers decrease.
Unsupported operating systems
When OS or middleware support ends, security and compliance risks increase.
Operations depend on specific individuals
Business continuity becomes fragile when only a few people understand the system.
High operating cost
Maintenance, infrastructure, manual operation, and change requests become increasingly expensive.
DX becomes harder
Old architecture can prevent API integration, cloud adoption, data utilization, automation, and AI use cases.
HOW IT WORKS · 4 STEPS
01 · Inventory & assessment
Review current systems, languages, OS, architecture, data, dependencies, operation process, and business-critical functions.
02 · Strategy selection
Decide whether to rehost, replatform, refactor, rebuild, or replace based on risk, budget, timeline, and business impact.
03 · Phased execution
Migrate, rebuild, or renew by priority so business operation can continue while the IT foundation is improved.
04 · Stabilize & operate
Validate quality, improve documentation, reduce dependency on specific individuals, and support long-term operation.
Not sure which modernization path fits your system?
Start with a discussion. We will listen to your current situation and help identify the practical next step.
View case studies Book a consultWHAT LEGACY MODERNIZATION MEANS AT SYP
Updating old systems into an IT foundation for sustainable growth
SYP’s Legacy Modernization Support helps companies update and optimize old IT systems with modern technologies and architectures. The goal is not simply to move systems from one environment to another, but to create an IT foundation that is easier to maintain, scale, secure, and improve over time.
SYP works with clients from current-state inventory and assessment through modernization planning, migration, development, testing, deployment, and operation.
Discuss your legacy system →COMMON MODERNIZATION TRIGGERS
Common situations we help clarify
“The system still works, but every change takes too long.”
“The original specifications are missing or outdated.”
“Only one or two people understand the operation.”
“The OS or middleware is no longer supported.”
“We want to use cloud, data, or AI, but the current system blocks us.”
“We know modernization is necessary, but a full rebuild feels too risky.”
FOUR CORE OBJECTIVES
Modernization should improve the system you operate - and the options you have next.
Maintainability
Make the system easier to understand, change, test, and hand over.
Scalability
Prepare the architecture and infrastructure for future business growth.
Security
Reduce risks from unsupported environments, outdated dependencies, and unclear access control.
DX readiness
Enable future integration, automation, data use, cloud adoption, and AI-related workflows.
MODERNIZATION APPROACHES
Five paths. The right one depends on your risk, budget, timeline, and business goal.
Modernization does not always mean rebuilding everything. We assess where each approach makes practical sense.
| Approach | Overview | Features / when it fits |
|---|---|---|
| Rehost | Move the application as-is to cloud infrastructure. | Also called Lift & Shift. Useful when the first priority is infrastructure renewal with minimal application change. |
| Replatform | Make minor changes while migrating to cloud or a new OS. | A balanced option when cost, speed, and benefit must be controlled. |
| Refactor | Redesign code and structure. | Improves the application and helps eliminate technical debt. |
| Rebuild | Reconstruct the application from scratch. | Suitable for DX-oriented renewal, but cost and scope are higher. |
| Replace | Swap with packaged software or SaaS. | Prioritizes speed and business process optimization when custom development is not the best answer. |
DELIVERY SCOPE
From assessment to execution
- System inventory and current-state assessment
- Technical debt and risk analysis
- Modernization roadmap and cost / timeline planning
- Architecture design and migration strategy
- Cloud migration / OS migration planning
- Refactoring, rebuild, or package/SaaS replacement support
- Data migration and integration design
- Testing, deployment, and post-release stabilization
- Documentation recovery and operation handover
- Long-term maintenance and improvement
TEAM & GOVERNANCE
Modernization needs both business context and engineering control
| Role | Responsibility |
|---|---|
| Business Consultant / BA | Clarifies goals, operations, hidden business rules, and user impact. |
| Solution Architect | Designs target architecture and modernization strategy. |
| Tech Lead | Reviews existing code and technical constraints. |
| Engineers | Implement migration, refactoring, rebuilding, integration, and UI/API renewal. |
| QA Engineers | Validate functional behavior, regression impact, data integrity, and release readiness. |
| DevOps / Cloud Engineer | Supports infrastructure, deployment, monitoring, and cloud readiness. |
| PM / Bridge PM | Manages timeline, communication, reporting, and phased release governance. |
CUSTOMER VOICE
What clients value in the working relationship
Communication quality, understanding of requirements, stability, and follow-through.
Beyond the high quality, we really feel the speed of development. Deadlines are strictly met, and high quality is maintained.
Mr. Junpei Suzuki - Product Manager
SpiderPlus & Co.
SYP places strong emphasis on quality and has established robust quality assurance processes. As a result, we can confidently entrust them with end-to-end system development.
Mr. Kimihiko Asabe
Deputy Division Manager, DX Platform Division · Nomura Research Institute (NRI)
SY Partners has committed to ensuring that their customers always receive high-quality IT products that meet all technical requirements. We have collaborated with SY Partners on many IT projects and have always been satisfied with the products and services they provide.
Ms. Usui Kiki
CEO · Hubbit, Inc.
We have collaborated with SY Partners on a software development project and were very impressed with the professionalism and dedication of their technical team.
Mr. Takuya Kubota
Co-Founder CTO · mui Lab, Inc.
Read customer interviews →The quality of service provided by SY Partners is truly remarkable. They always ensure that all of our requests are met on time and with the best quality possible.
Mr. Satoshi Kosugi
CEO · Overture Inc.
FULL WORKFLOW · 7 STEPS
From business consulting to maintenance / operation
Legacy modernization often starts with unclear information. A structured workflow helps turn current-system risk into a practical renewal plan.
| Step | Description |
|---|---|
| Step 01 Business Consulting | Conduct research to understand the client’s business goals and operations, study the market, and identify important factors in order to propose suitable solutions. |
| Step 02 Requirement Definition | Define software requirements, key features, functions, and technical conditions so the product can meet real customer needs. |
| Step 03 Designing | Identify the software architecture, core components, and user interface. Ensure the product is scalable, upgradable, and secure. |
| Step 04 Development | Build the product based on the agreed requirements and design blueprint, using appropriate technologies and tools to produce a high-quality result. |
| Step 05 Testing | Ensure the software meets requirements and works accurately. QA specialists perform rigorous testing and fix issues when necessary. |
| Step 06 Deployment | Install, configure, and test the product before and after it is deployed in the real application environment. |
| Step 07 Maintenance / Operation | Maintain and operate the product to ensure stability and improve or upgrade it when necessary. |
FAQ
Questions we hear before modernization starts
Which modernization approach is right for us?
SYP starts with inventory and assessment, then recommends the appropriate path: Rehost, Replatform, Refactor, Rebuild, or Replace.
Is Lift & Shift enough?
It can be useful when the first priority is infrastructure renewal, but it may not solve technical debt or maintainability. SYP should help judge whether it is enough for the business goal.
Can SYP support COBOL or VB6-related modernization?
SYP can assess systems using older languages such as COBOL or VB6 and help plan a practical modernization path. Final technical scope should be confirmed case by case.
Can modernization reduce security risk?
Yes. Modernization can help reduce risks from unsupported OS, outdated dependencies, unclear access control, and old operation processes.
Do we need to rebuild everything?
No. Depending on the situation, modernization may mean rehosting, replatforming, refactoring, rebuilding selected functions, or replacing parts with packaged software/SaaS.
What would modernization cost?
Cost depends on system size, risk, migration approach, and release scope. The first step should be assessment and roadmap creation.
Start with one workflow worth improving.
Tell us what process you want to automate, assist, or make easier to operate. We will help clarify the use case, data, system integration, and first practical release.
Book a modernization consult View case studies View customer interview