Coding agents make code cheaper. Senior engineering makes it safe. Mach Lilies uses AI-assisted engineering, automated tests, documentation agents and architecture review to modernize legacy systems faster — while keeping senior engineers in control of architecture, security, testing and release quality. Mach speed. Lily craft.
Coding agents make code cheaper. Senior engineering makes it safe.
Legacy systems are where most organisations actually live — and where AI-assisted engineering pays off fastest. Mach Lilies pairs coding agents, automated test generation and documentation agents with senior human review, so modernization moves at agentic speed without lowering the bar on architecture, security or maintainability. This is our bridge service: the same production discipline as our software practice, now accelerated by agents and governed by people.
Assessment, test harnesses, refactoring, API wrapping, security and migration — accelerated by agents, governed by seniors.
We map the system, its risks and its real constraints, and agree a sequenced modernization plan.
Automated test generation that wraps legacy code in a safety net before anything is changed.
Documentation agents reconstruct the knowledge that left with the original team.
Monolith extraction, refactoring and UI rebuilds — AI-assisted, senior-reviewed and incremental.
Wrap legacy systems in clean, documented APIs so new services and agents can build on them safely.
Security remediation and cloud migration with the same production discipline as a greenfield build.
Four movements that modernize legacy systems fast — without betting the business on a big-bang rewrite.
Understand the architecture, risks and constraints before changing a line.
Generate tests and documentation so changes are safe and reversible.
AI-assisted refactoring and rebuilds, with senior engineers owning architecture and review.
Production-grade quality gates, security, and a clean hand-off your team can own.
For organisations whose growth is held back by software that's hard to change — but too important to replace blindly.
AI does the heavy lifting; senior engineers own architecture, security and release quality.
We don't change legacy code until it's wrapped in tests and documented.
Modernization in safe steps, not a risky big-bang rewrite.
Clean, documented, tested systems handed over with no lock-in.
Legacy modernized faster — with tests, documentation, and senior review on every change.
It's modernizing legacy software using AI-assisted engineering — coding agents, automated test generation and documentation agents — with senior engineers in control of architecture, security, testing and release quality. You get the speed of agents and the safety of experienced human judgement.
It would be without controls — which is why we build a safety net first. We generate tests and documentation before changing anything, work incrementally, and put senior engineers on architecture and review. Agents accelerate the work; people own the quality bar.
Same production discipline, accelerated by agents. Our product engineering practice builds new software; AI-native modernization applies the same standards to existing systems, using agents to make assessment, testing, documentation and refactoring dramatically faster.
Almost always incremental. Big-bang rewrites are high-risk; we prefer to wrap legacy systems in tests and APIs and modernize in safe, reversible steps — though we'll assess and recommend honestly for your situation.
Yes. Security remediation and cloud migration are part of the service, delivered with the same quality gates as a greenfield build.
Yes. We hand over clean, tested, documented systems with no lock-in — including the test harnesses and documentation the agents helped create, so your team can keep moving.
Tell us about the legacy system, what it's blocking, and where it hurts most. We reply to every serious enquiry within one business day.
