The Pain Point: Government agencies are trapped by monolithic legacy systems—think decades-old COBOL applications or proprietary databases. These systems create immense technical debt, stifling innovation, increasing security risks, and making integration with modern tools like our AI-Powered Permit Approval Engine nearly impossible. Manual refactoring is slow, expensive, and risky, often leading to failed projects and wasted budgets.
Use Case
Legacy System Modernization Agent

What is a Legacy System Modernization Agent Used For?
Legacy systems are a critical bottleneck for public sector innovation. A Legacy System Modernization Agent is a specialized AI that incrementally refactors and migrates these outdated platforms, unlocking new digital services without the risk of a 'big bang' replacement.
The AI Fix: A modernization agent acts as an automated engineer. It uses AI to analyze legacy code, map data flows, and execute incremental refactoring waves. This approach de-risks migration, reduces manual effort by up to 70%, and progressively unlocks APIs for new digital services. The outcome is a modern, composable architecture that enables faster deployment of tools like Generative AI for Public Service Chatbots and measurable ROI through reduced maintenance costs and accelerated service delivery.
Common Use Cases for Legacy System Modernization Agents
Transform monolithic legacy systems into agile, AI-ready platforms through targeted, low-risk interventions that deliver immediate ROI and unlock new digital service capabilities.
Automated Mainframe-to-Cloud Migration
Replace risky 'big bang' migrations with AI agents that incrementally refactor and migrate COBOL or RPG logic to cloud-native microservices. Key benefits include:
- Reduced Risk: Agents test and validate each module before cutover, avoiding system-wide failures.
- Cost Savings: Cut migration project timelines by 40-60% and reduce ongoing mainframe licensing costs by up to 70%.
- Talent Gap Mitigation: AI interprets and documents legacy code, preserving institutional knowledge as senior developers retire. Real Example: A state unemployment agency used agents to migrate its core benefits engine, avoiding $15M in projected mainframe costs and enabling new mobile self-service features.
Intelligent Data Liberation & API Creation
Unlock data trapped in legacy databases (e.g., VSAM, IMS) by using AI agents to automatically map schemas, cleanse data, and generate secure, modern REST APIs. This creates a digital service layer without disrupting the underlying system.
- Accelerated Innovation: New citizen-facing apps can be built in weeks, not years, by consuming these APIs.
- Operational Efficiency: Eliminate manual data entry and reconciliation by enabling real-time system interoperability. Real Example: A county health department used this approach to connect its 30-year-old patient registry with a modern vaccination portal, reducing data entry workload by 80% and improving reporting accuracy.
AI-Powered User Interface Modernization
Deploy AI agents to analyze green-screen (3270) or client-server application usage patterns and automatically generate intuitive, web-based user interfaces. This preserves core business logic while dramatically improving user experience and productivity.
- Training Cost Reduction: Modern UIs reduce training needs for new staff by over 50%.
- Error Reduction: Guided workflows and validations cut data entry errors by up to 90%. Real Example: A public utilities agency modernized its field inspection application, reducing inspection report completion time from 45 minutes to under 10 minutes and improving data quality for regulatory compliance.
Continuous Compliance & Security Hardening
Use AI agents to continuously scan legacy codebases for security vulnerabilities (e.g., SQL injection, buffer overflows) and compliance gaps (e.g., PII handling, PCI-DSS). Agents can automatically apply patches or refactor code to meet standards.
- Risk Mitigation: Proactively address vulnerabilities before they are exploited, reducing audit findings and potential breach costs.
- Automated Reporting: Generate audit-ready documentation of security posture and compliance controls. Real Example: A financial services unit within a government agency used agents to harden its legacy payment system, achieving FedRAMP Moderate authorization 6 months ahead of schedule.
Modular Service Decomposition
Break down monolithic applications into discrete, reusable business capabilities (microservices) using AI to analyze transaction flows and dependencies. This enables incremental replacement of the most costly or fragile parts of the system.
- Improved Agility: New features or policy changes can be deployed to isolated services without full regression testing.
- Reduced Technical Debt: Retire specific legacy components as their modern replacements go live, systematically reducing complexity. Real Example: A transportation department decomposed its monolithic licensing system, first modernizing the payment engine. This alone reduced transaction failures by 65% and laid the foundation for a full digital driver's license.
Legacy System Integration & Orchestration
Deploy AI agents as an orchestration layer that connects multiple legacy systems (e.g., finance, HR, permitting) to run end-to-end citizen services. The agents translate data formats and manage workflows without costly point-to-point integrations.
- Faster Service Delivery: Enable cross-agency services like 'Business One-Stop Shops' that previously required manual intervention.
- Cost Avoidance: Delay or avoid nine-figure ERP replacement projects by making legacy systems interoperable. Real Example: A city used an agentic orchestration layer to connect its permitting, zoning, and utilities systems, reducing the time to open a small business from 90 days to under 14 days.
How It Works: The AI-Agentic Modernization Process
Legacy systems are a critical barrier to digital service delivery, locking agencies in cycles of high maintenance costs and slow innovation. Our AI-Agentic Modernization process provides a systematic, low-risk path forward.
The Pain Point: Outdated COBOL mainframes and monolithic applications create immense technical debt, consuming over 70% of IT budgets just to keep the lights on. This strangles innovation, delays citizen services, and creates severe security and compliance risks. A 'big bang' replacement is too costly and risky, leaving agencies stuck. This directly impacts core missions like benefits eligibility and public records access.
The AI Fix: We deploy specialized AI agents that perform incremental refactoring. These agents analyze legacy code, automatically generate modern microservices, and execute migration in controlled waves. The outcome is measurable: reduce legacy maintenance costs by 40-60% within 18 months and unlock the capacity for new digital services. This agentic approach is a foundational capability for broader agentic enterprise orchestration.
Enabling Efficiency, Speed & Accuracy
Intelligent Analysis, Decision & Execution
We build AI systems for teams that need search across company data, workflow automation across tools, or AI features inside products and internal software.
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Search across company data
Give teams answers from docs, tickets, runbooks, and product data with sources and permissions.
Useful when people spend too long searching or get different answers from different systems.

Automate internal workflows
Use AI to route work, draft outputs, trigger actions, and keep approvals and logs in place.
Useful when repetitive work moves across multiple tools and teams.

Add AI to products and internal tools
Build assistants, guided actions, or decision support into the software your team or customers already use.
Useful when AI needs to be part of the product, not a separate tool.
Real-World Examples & Case Studies
See how AI agents are de-risking and accelerating the modernization of critical government systems, delivering measurable ROI through incremental, value-driven projects.
Incremental Mainframe Migration
A state Department of Motor Vehicles used an AI agent to incrementally refactor a 30-year-old COBOL-based licensing system. The agent analyzed the monolithic codebase, identified discrete business functions, and orchestrated their migration to a cloud-native microservices architecture in prioritized waves.
- ROI: Reduced annual maintenance costs by 65% within 18 months.
- Outcome: Unlocked new digital service capabilities, enabling online license renewals that processed 200k+ transactions in the first quarter post-launch.
- Risk Mitigation: Avoided a high-risk 'big bang' replacement that was previously estimated at 3 years and $15M.
Legacy Data Unlocking for Citizen Services
A county social services agency deployed an AI agent to modernize its data access layer. The agent created secure APIs to bridge a legacy benefits eligibility system with a new citizen portal, without replacing the core database.
- Business Value: Enabled real-time eligibility checks, cutting application processing time from 10 days to under 24 hours.
- Efficiency Gain: Freed up 40% of caseworker time previously spent on manual data entry and verification.
- Strategic Benefit: Created a composable architecture, allowing future AI services (like our Public Benefits Fraud Detection) to be plugged in seamlessly.
Automated Code Documentation & Testing
A municipal utility with undocumented legacy systems used an AI agent to reverse-engineer and document critical logic for billing and grid management. The agent generated comprehensive documentation, identified dead code, and created a suite of automated tests.
- Cost Avoidance: Prevented a 'brain drain' crisis as senior developers retired, preserving institutional knowledge.
- Accelerated Change: Reduced the time for implementing regulatory updates from 6 months to 6 weeks.
- Foundation for AI: The clean, documented codebase became the foundation for deploying Predictive Public Infrastructure Maintenance AI models.
Modular Permit System Modernization
A city planning department faced with a slow, paper-based permitting process used an AI agent to modularize and modernize its system. The agent extracted the core approval workflow logic and rebuilt it as a cloud service, integrating with a new digital front-end.
- Citizen Experience: Permit approval times dropped from 4-6 weeks to under 72 hours for standard requests.
- Operational ROI: Enabled the department to handle a 30% increase in application volume without adding staff.
- Scalable Model: This modular approach is now the blueprint for modernizing other systems, such as the AI-Powered Permit Approval Engine.
SAP R/3 to S/4HANA Business Logic Migration
A large public transit authority used an AI agent to analyze and map thousands of custom transactions and reports from its legacy SAP R/3 system to a new S/4HANA platform. The agent ensured business logic and compliance rules were preserved.
- Project Acceleration: Cut the migration planning and design phase by 50%.
- Risk Reduction: Achieved a 99.8% accuracy rate in logic translation, avoiding costly post-go-live errors.
- Future-Proofing: The clean migration established a data foundation for advanced Intelligent Content Management and analytics.
Legacy GIS System Integration
A state environmental agency had critical land management data locked in a proprietary, unsupported GIS system. An AI agent was deployed to extract, transform, and load the spatial data and associated business rules into a modern, open-source platform.
- Unlocked Value: Made decades of environmental data instantly accessible for analysis, supporting faster permit reviews and conservation planning.
- Cost Savings: Eliminated $250k+ in annual licensing fees for the legacy system.
- Strategic Enablement: The modernized data layer now feeds real-time AI-Driven Disaster Response Coordination systems.

About the author
Prasad Kumkar
CEO & MD, Inference Systems
Prasad Kumkar is the CEO & MD of Inference Systems and writes about AI systems architecture, LLM infrastructure, model serving, evaluation, and production deployment. Over 5+ years, he has worked across computer vision models, L5 autonomous vehicle systems, and LLM research, with a focus on taking complex AI ideas into real-world engineering systems.
His work and writing cover AI systems, large language models, AI agents, multimodal systems, autonomous systems, inference optimization, RAG, evaluation, and production AI engineering.
Partnered with leading AI, data, and software stack.
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