Whether you’re migrating to the cloud, refactoring legacy codebases, or replacing ageing systems with modern architecture, we help you move forward with confidence, control, and continuity.
Understanding Legacy Software Modernisation
Legacy systems often sit at the heart of an organisation’s operations — powering essential processes, storing valuable data, and supporting long-standing customer relationships. But as technology evolves, these systems can become barriers to agility, scalability, and security. Modernising legacy software is about more than just upgrading code — it’s about enabling your organisation to move faster, reduce risk, and unlock new capabilities.
At 6B, we work with clients to modernise critical systems in a way that respects existing workflows while preparing for the future. That might mean containerising monolithic applications, moving to microservices, rebuilding with modern frameworks, or replatforming to the cloud. We assess your current system, identify the risks and opportunities, and chart a clear, phased path to modernisation that aligns with your operational and commercial goals.
Our team brings experience in working with outdated technologies like COBOL, VB6, Classic ASP, and on-prem ERP systems — helping businesses transition to modern stacks such as .NET Core, Node.js, React, and cloud-native services across AWS, Azure, and GCP.
Our Legacy Software Modernisation Approach
Our approach to legacy modernisation begins with discovery and assessment. We work closely with your team to understand the business role of your existing system, its architecture, dependencies, and data flows. This enables us to build a complete picture of what needs to change — and what needs to be preserved.
We evaluate modernisation strategies ranging from full rebuilds and re-architectures to wrapper-based approaches, API enablement, and gradual migration. Our goal is always to minimise disruption while delivering meaningful improvements in performance, maintainability, and user experience.
From there, we move into delivery — using agile, iterative methods to modernise components in manageable stages. We incorporate automated testing, CI/CD pipelines, and robust monitoring from the start, ensuring each modernised module is stable, secure, and production-ready. When needed, we also support parallel run strategies and data migration services to ensure a seamless cutover from legacy to modern.
Throughout the process, we prioritise business continuity, stakeholder involvement, and measurable outcomes — whether that’s faster performance, lower costs, better integration, or easier updates.
Technologies Used In Legacy Software Modernisation
Why Choose 6B for Legacy Software Modernisation?
6B combines deep technical expertise with a pragmatic, business-first approach to legacy software modernisation. Our team includes full-stack developers, software architects, cloud engineers, and system integrators with experience in both legacy and modern technology ecosystems. That dual perspective allows us to modernise with care — avoiding unnecessary disruption while maximising long-term value.
We’ve helped clients across finance, healthcare, logistics, government, and more to transform ageing systems into secure, scalable digital platforms. Whether it’s modernising a legacy CRM, migrating an internal tool to the cloud, or rebuilding a customer-facing portal, we deliver solutions that are robust, future-proof, and aligned with your strategic goals.
With 6B, legacy modernisation isn’t just a technical upgrade — it’s a foundation for innovation, flexibility, and sustainable growth. We help you bridge the gap between old and new, so your technology keeps pace with your ambition.
Selected Legacy Software Modernisation Case Studies
Explore how we’ve partnered with organisations across sectors to design and deliver legacy software modernisation solutions that solve complex challenges and drive measurable impact.
NHS South Yorkshire ICB
AI Software to Automate Primary Care Communications
PetStay
Designing a Unified Secure Case-Management & Customer Portal System for Franchise and HQ Operations
Lemoncake
Building a Secure, Multi-Stakeholder Platform for Music Rights, Distribution & Usage Reporting
Integral BCS
Developing a Secure, Unified Portal & Management System for Building Control Services
Bradford Council
Empowering Prospects Online with Secure Custom PHP Portals
Greater Manchester Combined Authority
Integrating GMCA’s Early Years Service with EMIS and SystmOne
Estimate the Cost of Your Legacy Software Modernisation Project
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Thank you for your request! 🙌 We will review your project and get back to you within 24 hours to share a ballpark estimate.
Want to speak to someone today? Call 6B on 0113 350 1290.
Readiness checklist for Legacy Software Modernisation
- Document the business-critical functions your legacy system supports and identify which must be preserved in a modernised solution
- Audit the current technology stack, dependencies, and infrastructure (databases, servers, integrations, APIs, third-party tools)
- Review data structures and plan for migration — including data quality, cleansing needs, and retention/compliance policies
- Identify pain points and technical debt in the current system (e.g., performance bottlenecks, unsupported frameworks, security gaps)
- Define the target outcomes of modernisation (cloud readiness, microservices, improved UX, reduced maintenance costs, scalability)
- List regulatory, compliance, and security requirements the modernised system must meet
- Assign stakeholders from IT, business units, and compliance to support requirements gathering and decision-making during modernisation
Speak To Our Legacy Software Modernisation Experts
Whether you're developing new bespoke software or extending existing software with Legacy Software Modernisation, 6B brings the software expertise and experience needed to accelerate delivery.
