Break free from legacy systems and unlock innovation with AI
We modernise legacy systems up to three times faster by leveraging controlled, engineer-operated AI. Our robust approach transforms your IT infrastructure into a strategic asset for business growth.
We accelerate the transformation of legacy systems into modern, secure and scalable platforms - powered by expert-operated AI
At Theodo, we support organisations in transforming their legacy systems to make them more secure, agile and scalable. Using our proprietary Lean Tech® framework alongside AI managed entirely by our engineers, we expedite modernisation programmes while retaining full control over quality.
One of the primary obstacles in legacy projects is the reliance on scarce expertise in outdated technologies. Our AI tools enable us to understand, analyse and overhaul such systems, even when in-house knowledge of the original technology is no longer available.
Our approach allows clients to dramatically reduce delivery timelines - up to three times faster - and halve costs, all while ensuring business continuity during the transition. It enhances security, reduces maintenance costs through more modular architectures, and improves time-to-market for new features.
We deploy small, high-performance squads of engineers who specialise in software architecture, backend and frontend development, cloud infrastructure and AI. These teams can deliver complex projects across both contemporary and legacy technology stacks. Key deliverables include a comprehensive functional and technical mapping of existing systems, a target architecture unencumbered by legacy constraints and a suite of proprietary AI agents that automate code conversion in line with current industry standards.
We undertake the modernisation of ERPs, mobile frontends, e-commerce platforms and technical backends for clients such as Urgo, Health Hero and Qonto.
They trust us
"Theodo enabled us to migrate our platform core in record time with superior code quality, freeing our internal teams to focus on strategic projects."
Our client stories
Lefebvre Dalloz: Moving from technical debt to strategic velocity in 3 months
Accelerated migration by AI from an OpenRoad ERP (by Actian) to Angular & Spring Boot.
Minlay: From critical obsolescence to a cloud-ready ERP platform, powered by AI, to support its growth x3 by 2030
Redesign of the customer portal and modular modernization of the ERP in Symfony, in 18 months with AI.
HealthHero: PMS migration to a microservices architecture, designed to scale at no extra cost
Fusion of Qare (FR) and Adastra (UK) backends in a unified platform in Nest.JS.
Our offers
Cloud: build or move to cloud
Migrate your infrastructure to the cloud to gain agility and reduce costs.
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IT infrastructure audit and cloud architecture
Secure and optimize your Cloud infrastructure to support your growth.
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Replatforming
Gagnez en agilité et en performance grâce à un replatforming e-commerce composable.
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Our partners
To accelerate and secure legacy system modernisation, we rely on leading cloud and technology providers such as Google Cloud. Their platforms offer a robust and scalable foundation on which we build tailored solutions aligned with business needs, security requirements and client scale.
Our insights
Our leaders
Discover other capabilities
Technical assistance
Empower your IT teams to deliver faster, better and without compromise
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Experience Design
Anchoring the future of digital products in useful, sustainable and desirable experiences.
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