SERVICES

    AI-First Software Modernisation

    Everyone wants AI agents running their business. Almost no platform is ready for them. We close that gap. We modernise the software foundations that make it possible to run agents safely, at scale, without the platform becoming a liability.

    You’re in good company

    A force multiplier to unlock trapped value

    £0M
    revenue potential unlocked
    0%
    system performance improvement
    0×
    user adoption acceleration
    Read Client Stories

    IS THIS YOU?

    Your AI ambitions are being blocked by your platform

    Too coupled. Too untested.

     

    Your engineers use AI daily. But the platform is too tightly coupled and untested to absorb the output safely.

    A mandate without a map.

     

    Mandated to adopt agentic AI with no clear picture of what your platform needs to become first.

    Tribal knowledge running thin.

     

    Every change slow, risky, and dependent on a shrinking group who still understand the codebase.

    Modernisation that made things worse.

     

    Tried modernisation before and watched it stall, overrun, or create more complexity than it solved.

    Working around, not on it.

     

    Engineers spending more time working around the platform than building on it.

    The business case doesn't add up.

     

    You know you need to change. But you can't make the business case linking platform investment to commercial outcomes.

    OUR APPROACH

    AI-native business sits on two foundations. We build both.

    AI-First Software Modernisation is Codurance’s approach to building the foundations that achieve your ambitions for autonomous agents operating safely and effectively across your business.   

    Leveraging 13+ years of software craftsmanship and AI fluency, we apply our framework incorporating architecture, platform, practices and processes in parallel. Discover how we deliver a platform that is safe to work on, fast to evolve and ready to support agents.

     

    YOUR FOCUS (with our help)

    AI-native business and product

    Agents orchestrating decisions, automating processes, creating leverage across the enterprise

    Both foundations produce outcomes you can point to. Not cleaner code in isolation: a platform that moves faster, breaks less, and is genuinely ready for the AI capabilities your business is building toward.

    • FOUNDATION 1

      AI-ready system

      Modular, observable, agent-consumable

      A modular architecture and an observable platform that AI tooling and agents can safely operate in. 

      Clean, well-documented APIs and event streams ready for AI agent consumption from day one

      • FOUNDATION 1

        Architecture

        Modular systems AI can reason about

        We decompose monoliths using the Strangler Fig pattern and Domain-Driven Design, producing well-bounded, independently deployable services that humans and agents can both safely change. We redesign around API-first principles and event-driven architecture, exposing clean contracts and real-time event streams that agents can subscribe to and act on.

      • FOUNDATION 1

        Platform

        Observable, cloud-native, scale-ready

        You cannot operate AI agents on systems you cannot observe. We instrument your platforms with structured logging, distributed tracing, and real-time dashboards. The cloud-native infrastructure we build scales for AI workloads without compounding spend.

        OpenTelemetry · Distributed tracing · Platform engineering · Cloud-native

    • FOUNDATION 2

      AI-accelerated engineering

      Teams shipping safely with AI in the loop

      The second is AI-accelerated engineering: the practices and processes that let your teams build, change, and ship with AI without the platform falling behind. Neither alone gets you there.

      • FOUNDATION 2

        Practices

        Quality at AI speed

        Low test coverage is the single most common blocker to safe modernisation. And to safe AI adoption. We rapidly improve coverage using characterisation testing, mutation testing, and TDD coaching. The result is a safety net that makes every change, by humans or agents, faster and less risky.

        TDD · Characterisation testing · Mutation testing · Clean code

      • FOUNDATION 2

        Processes

        Delivery cadence built for change

        Modernisation only sticks when your teams own it. Our craftspeople embed in your engineering teams, improving CI/CD, release cadence, and the delivery discipline that lets AI-accelerated change reach production. The skills and practices stay when we leave.


        CI/CD · Embedded coaching · Knowledge transfer · Delivery discipline

    VISION

    Modernisation strategy and roadmap

    We start with your business model, your AI ambitions, and your constraints. From there we design a pragmatic, sequenced modernisation roadmap that delivers value at every stage without stopping the business. No big bang. No multi-year programmes that go dark.

    Current state assessment · Sequenced roadmap  · Business case

    WHAT YOU GET

    A platform your whole organisation can move on

    Both foundations produce outcomes you can point to. Not cleaner code in isolation: a platform that moves faster, breaks less, and is genuinely ready for the AI capabilities your business is building toward.

    F1_AI-ready systemFOUNDATION 1

    AI-ready system

    • A modular, observable platform. Teams can change it confidently. AI tooling can work within it safely.

    • Clean, well-documented APIs and event streams ready for AI agent consumption from day one

    F2_AI-accelerated engineeringFOUNDATION 2

    AI-accelerated engineering

    • Meaningful test coverage. The safety net that makes every subsequent change, by humans or agents, faster and less risky.
    • Engineering teams with the skills and practices to sustain modernisation without ongoing dependence on Codurance
    • A clear, sequenced path from where you are today to AI-driven business workflows, with a business case at every stage
    Illustrative modernisation scorecard – 1

    Illustrative example, your engagement will be scoped specifically to your platform, codebase and business objectives

    CLIENT STORIES

    Modernisation that shipped

    Outcomes from real engagements. Each one a proof point for the approach we’d bring to yours.

    0+
     
    PE-BACKED SAAS
    From single-customer to 1,000-customer scale

    A PE portfolio company’s platform failed on every second customer. Codurance rebuilt the foundations in-team, incrementally, without a rewrite. Within nine months it supported over a thousand.

    9 months

    No rewrite Exit-ready

    –0
     
    FINANCIAL SERVICES

    Concurrent incidents eliminated through DDD

    A financial monolith was averaging ninety concurrent incidents. Domain-Driven decomposition into bounded contexts brought that to zero. A system humans and agents can both safely change.

    12 months

    DDD Bounded contexts

    0%
     
    SAAS PLATFORM

    Sixty percent faster to production

    An embedded SaaS provider couldn’t absorb AI-accelerated output. Codurance embedded TDD, rebuilt the test pyramid, and modernised the pipeline. Time to production fell by 60%

    6 months

    TDD CI/CD

    The Codurance team understood our business well and brought a fresh, innovative approach to our data management and forecasting process. The team demonstrated expertise across both data engineering and software development, to provide us with a comprehensive solution to our challenges. They worked iteratively, collaborating closely with colleagues across IWSR and at board level to understand our priorities and strategic direction. Codurance delivered their work to a very high standard, demonstrating progress throughout the project while expertly dealing with risks and issues as they arose. It was a pleasure to work with Codurance on this project.

    David Green

    Chief Technology Officer at IWSR

    The collaboration with Codurance helped us lay the technical and engineering foundations to scale our corporate tax application. Their approach was pragmatic, collaborative and aligned to our business goals. Together, we created a platform that supports the future of our business.

    Neil Robbins

    Chief Technology Officer at Alphatax

    Pragmatism is a widely discussed concept but rarely taken into account when you are looking for software development partners. Codurance team embodies just the right amount of practicality with the overall vision and knowledge to bring positive change to any organisation.

    Sapankumar Parikh

    Vice President of Software Development at eClinicalWorks

    I’ve worked with Codurance for a long time now, and their engineers and solutions are first class. Their Software Quality Assessment confirmed my initial assessment of our existing systems and gave me data-driven insights that supported my technical modernisation roadmap and the investment required to achieve this.

    Ian Kershaw

    Chief Technology Officer at Artlogic

    Ready to build the foundations for an AI-native business? Read our CTO guide to AI-First Software Modernisation.

    Guide cover: Cover of Codurance's CTO guide, AI-First Software Modernisation, a guide to building the foundations for an AI-native business

    HOW IT WORKS

    From legacy constraint to AI-ready platform

    Step 1 sets the direction. From there, engineering foundations and system modernisation run together, not in sequence. Each shapes the other. The whole programme stays anchored to what Agentic readiness actually requires, and we revisit that direction after every delivered increment.

    • Step 1

      Discovery and assessment

      We work with you to understand where your system stands today and what is genuinely blocking change. The output is a clear, prioritised roadmap built around your business goals, not a catalogue of technical debt. We revisit it after each increment, because the right next step changes as the system does.

    • Step 2

      Engineering foundations

      Good foundations are not a prerequisite phase you complete before starting. We build exactly what the next increment of system change requires: test coverage, observability, CI/CD discipline. Each improvement makes the next structural change faster and less risky. No more foundational work than the increment demands.

    • Step 3

      System modernisation

      Our craftspeople work inside your teams, not alongside them. We decompose the monolith incrementally, bring in clean architecture and API-first design, and move the system toward a state where agents can operate safely. What we tackle next is always shaped by the Agentic readiness goals your business is working toward.
    • Step 4

      Agentic readiness

      Agentic readiness is not a future phase. It sets the target for system modernisation from day one, grounded in the AI-native workflows your business actually wants to run. We introduce agent integration patterns, MCP servers, and event-driven contracts as the system becomes ready. When agents run in practice, what they need next feeds straight back into the programme.

    GETTING STARTED

    Not sure where to start?

    Most organisations know they need to modernise. Fewer know which problems to tackle first, or how to connect platform investment to the AI outcomes the business is asking for.

    Start with our AI and Engineering Assessment. A two-week, evidence-based review of your SDLC maturity and codebase readiness. You get a scored gap analysis and a prioritised roadmap before any modernisation work begins.

    TYPICAL NEXT ENGAGEMENTS

    AI and Engineering Assessment

    A two-week assessment of your SDLC maturity and codebase AI readiness. You get a scored gap analysis and prioritised modernisation roadmap before you commit to a programme.

    Embedded AI champions

    Codurance craftspeople embedded in your teams to accelerate agentic AI adoption across the SDLC, stage by stage, with the engineering discipline to keep it safe.

    Agentic AI design and delivery

    Once the platform foundations are in place, we design, build, and deploy your first AI agents. From scoped PoC to production, with governance built in from the start.

    Frequently asked questions

    If you can’t find the answer you are looking for here, please contact us

     

    What is AI-First Software Modernisation?

    It's Codurance's approach to getting your platform ready for AI agents. We modernise your architecture, platform, practices and processes in parallel, so agents can run safely and at scale without the platform becoming a liability.

    How is this different from a traditional modernisation programme?

    Traditional modernisation often treats cleaner code as the goal. We anchor everything to what agentic readiness actually requires and revisit that direction after every delivered increment. The result is a platform that moves faster, breaks less and is genuinely ready for the AI capabilities your business is building toward.

    What are the two foundations of an AI-native business?

    The first is an AI-ready system, meaning a modular, observable platform with clean APIs and event streams that agents can consume. The second is AI-accelerated engineering, meaning teams with the test coverage, practices and processes to ship safely with AI in the loop. Most organisations haven't built either yet, and we build both

    Do we need to rewrite our platform?

    No. We decompose the monolith incrementally and build exactly what the next increment of change requires. For one PE-backed SaaS client, we rebuilt the foundations without a rewrite and took the platform from failing on every second customer to supporting over 1,000 within nine months.

    How long does an engagement take?

    Every engagement is scoped to your platform, codebase and business objectives. Recent client programmes have delivered measurable results in six to twelve months, with progress visible after every increment rather than at the end.

    Will our team become dependent on Codurance?

    No. Our craftspeople work inside your teams, not alongside them. Part of the work is building the skills and practices your engineers need to sustain modernisation on their own once we step back.

    Get in touch

    Most conversations start with a 30-minute call to understand the situation and confirm whether we are the right fit.