Legacy application modernization

Transform your legacy apps into agile, high-performance systems that support today’s operations and tomorrow’s growth

Modernize your core. Accelerate your future

We turn aging, high-risk legacy systems from a costly liability into a strategic asset. Instead of draining resources, your core technology becomes a foundation for innovation. Our phased, low-risk approach ensures continuity while steadily reducing technical debt, enabling faster product delivery, and protecting your business reputation

Who we help

Our modernization service is built for organizations ready to turn outdated technology into a growth engine

Enterprises

Slash TCO by migrating from costly licenses to cloud-native platforms
Replace fragile systems with resilient, scalable architecture
Unlock new opportunities with a flexible, API-first foundation

Mature SaaS platforms

Break through MVP limitations by re-architecting for scale and performance
Accelerate product roadmaps and release features in weeks, not quarters
Boost developer velocity and attract top talent with a modern tech stack

Companies post-M&A

Eliminate technical debt across inherited systems and unify them into one modern platform
Strengthen security by replacing vulnerable, outdated apps with secure-by-design architecture
Gain real-time visibility with modern monitoring and observability

Problems we solve

Legacy systems create unique barriers to scale and innovation

The challenges

Uncontrollable TCO
Mounting technical debt
Complex or blocked integrations
Missed market opportunities
Critical security vulnerabilities

What we do

Migrate your system to the cloud and open-source technologies to cut operational costs
Safely rebuild your application into modern microservices for stability and fast updates
Build a modern API layer to enable seamless integrations with new partner services
Implement CI/CD pipelines and agile processes to accelerate your time-to-market
Rebuild your system with a secure-by-design architecture to protect your business data

Discuss your path forward with an Architect

Book a free strategy session — a 30-minute consultation to explore your specific challenges and options

Services we offer

We modernize legacy applications with a focus on continuity, scalability, and measurable business impact

Consulting & Roadmapping

Assess your current systems, uncover technical and business risks, and deliver a tailored modernization roadmap designed to minimize disruption and maximize ROI

Data Migration & Integration

Securely transfer data from legacy databases into modern, cloud-ready platforms; ensure integrity, compliance, and seamless integration with other services and data lakes

Refactoring & Optimization

Re-architect code and components for performance, scalability, and maintainability — all while preserving existing functionality so business operations remain uninterrupted

Our “SafeShift” methodology

We don’t gamble on risky “big bang” rewrites. Instead, we deliver business value step by step

01
Audit & Strategy
We run a deep audit of code, architecture, and business processes; deliver a modernization roadmap with multiple scenarios, cost/timeline options, and clear ROI projections
02
Phased modernization
We build a modern API layer around the legacy core; gradually replace functions with microservices using the Strangler Fig Pattern. Your users experience improvements immediately, not at the end
03
Seamless migration & Launch
We design and execute a meticulous data migration plan with cleansing, validation, and sync and ensure business continuity with minimal downtime and a rollback-ready launch

Get your free modernization roadmap

Request a no-obligation analysis of risks, costs, and opportunities with a phased plan you can act on immediately

Case studies

Find out how we've helped our clients through their challenges

Passenger transportation, Web

Legacy dispatch and operator system modernization

Comprehensive transformation of dispatch and operator system to enable scalability and operational effectiveness

Telecommunication, Web

Telecommunication app reengineering

Redevelopment of a web-based management application for remote monitoring and management of telecommunication equipment

Hospitality, Web

Moving to serverless architecture

App migration to a serverless architecture to reduce infrastructure maintenance costs and improve project scalability

Why Twelvedevs?

We combine deep technical expertise with a relentless focus on business outcomes

Proven playbooks

We use tested migration patterns like Strangler Fig and data migration strategies to de-risk your project from day one and accelerate delivery

End-to-end expertise

From initial audits and planning to cloud architecture, microservices development, and data migration — we manage the entire process

Business-first approach

We translate complex technical decisions into clear business value, measuring success in business terms: lower TCO and greater agility

Your path to a modern architecture

Within one business day, we’ll schedule a short discovery call to understand your current system challenges and business goals

If there’s a fit, our senior architects conduct a deep-dive analysis to assess risks and propose tailored strategies

You’ll receive a complimentary modernization roadmap — outlining strategies, TCO/ROI projections, and a phased action plan to move forward confidently