Legacy Modernisation
We modernise critical legacy systems without risking production stability.
Using an evolution-not-revolution approach, we unlock value from existing infrastructure while replacing the components that create cost, risk, and constraint.
What This Service Is
What problem does this solve?
Legacy Modernisation is focused on transforming fragile, monolithic, or outdated systems into maintainable, scalable architectures. This is not a big-bang rebuild. It is a structured, risk-managed programme that identifies high-risk and high-cost legacy components, replaces brittle middleware with modern microservices, wraps legacy systems with stable integration layers, gradually refactors undocumented or unsupported code, and preserves business continuity during change. The objective is controlled evolution of revenue-critical infrastructure.
Typical Deliverables
- Forensic Estate Mapping
- Targeted Replacement Strategy
- Infrastructure Exit Plans
- Legacy Wrapping & Extension
- Governance & Oversight
When You Typically Need This
Contract Renewal Pressure
Multi-million pound middleware or licensing renewals are approaching and no longer commercially viable.
Fragile or Undocumented Systems
Key systems are poorly documented, dependent on former developers, or too risky to change.
Security Vulnerabilities
Outdated software exposes sensitive data or fails modern security standards.
Acquisition-Driven Complexity
Growth through mergers has created fragmented, incompatible systems.
Technical Obsolescence
Core infrastructure is decades old and cannot integrate cleanly with modern tools.
What We Deliver
Forensic Estate Mapping
- System landscape diagrams
- Sequence and dependency mapping
- Identification of high-risk components
- Commercial exposure analysis tied to renewal deadlines
Targeted Replacement Strategy
- Drop-in microservice replacements
- API-first integration hubs to sit over legacy systems
- Controlled decommissioning of monolithic middleware
Infrastructure Exit Plans
- Migration roadmaps aligned to contract milestones
- Licensing reduction strategies
- Phased workload migration
Legacy Wrapping & Extension
- Self-service portals layered over legacy billing systems
- Modern data access layers for outdated databases
- Incremental refactoring of core logic
Governance & Oversight
- Executive-level technical leadership during transformation
- Documentation and knowledge transfer to eliminate key-man dependency
How We Deliver It
Evolution, Not Revolution
We modernise incrementally, allowing systems to run in parallel while new components are introduced.
Risk-Managed Sequencing
Changes are prioritised based on risk, cost exposure, and operational impact.
Production-Safe Engineering
We build alongside live systems rather than replacing them in a single disruptive event.
Open Standards & Ownership
Clients retain control of new infrastructure and reduce reliance on proprietary vendors.
Outcomes & Business Impact
The outcomes and benefits vary significantly from business to business. The examples below are typical, but your specific results will depend on your context, current state, and business objectives. We review these individually during discovery.
Technology & Architecture
Microservices Re-architecture
Breaking monolithic systems into scalable, independently deployable services.
API-First Integration Hubs
Building integration layers to sit atop legacy systems without replacing them wholesale.
Middleware Replacement Strategies
Identifying and replacing expensive, brittle middleware with modern alternatives.
Containerisation of Legacy Workloads
Wrapping legacy systems in containers for portability and scalability.
Modern Data Access Layers
Creating modern query and access interfaces over outdated databases.
Where This Service Is Used
Modernisation engagements have included: replacing 15-year-old financial reporting systems with structured verification platforms, designing exit strategies from expensive MuleSoft middleware, building integration layers across acquisition-driven enterprises, rewriting fragile invoice generation engines to eliminate persistent errors, and unlocking insights from decades-old SQL databases.
A Greener Future — Replacing Spreadsheet-Driven Environmental Assessments
Replaced AGF's complex Google Sheets-driven assessment system with a structured, web-based platform featuring revision control, role-based access, and scalable data architecture for carbon and environmental assessments.
Ecotalk — Automating Telecom Billing and Account Management
Modernised Ecotalk's billing and account management infrastructure with automated usage-based billing, secure integrations, and self-service portals, eliminating manual triggers and improving revenue predictability.
Vodafone Germany — Modernising Wholesale Invoice Verification 2
Modernised Vodafone Germany's wholesale invoice verification platform with a cloud-native, distributed architecture, eliminating vendor dependency and increasing throughput.
Frequently Asked Questions
Does this mean replacing everything?
No. The goal is targeted replacement of high-risk components while preserving stable, valuable systems.
Will this disrupt live operations?
Our approach is designed to minimise disruption by running new components alongside legacy systems.
When is this not the right service?
If you are building entirely new products or platforms without legacy constraints, other services may be more suitable.