Software engineering for regulated and data-heavy businesses.

Legacy system rewritesPlatform consolidationIntegration test harnessesTechnical leadershipMulti-tenant platforms

Recent work: an energy trading platform, a national government system rewrite, a threat detection backend.

Contract engineering and technical leadership for energy, finance, security and public-sector systems, proven by products we run ourselves.

Services

Legacy system rewrites

A system too old to change safely. A full rewrite to React and TypeScript, with pipelines, code review and end-to-end tests in place.

Platform consolidation

Separate applications running one business. One modular .NET monolith with a single role-based access model.

Integration test harnesses

Releases that depend on outside feeds you cannot call from a test. Container-based PostgreSQL tests with faked external feeds, plus architecture guard tests.

Technical leadership

A backend team that needs direction without a permanent hire. Design, code review, standards and mentoring inside your team.

Multi-tenant platforms

A product that serves many customers and must keep their data apart. Self-managed Kubernetes, single sign-on, messaging and tenant data isolation.

Evidence

Moon Cube client

Energy trading and supply company

Merging its trading application into the core energy platform; role-based access design; integration tests against faked market feeds. 2 applications merged into 1 platform, keeping every rule the old system enforced.

Before Moon Cube

Security software company

Backend team lead on a threat detection platform, leading 4 to 6 engineers.

Before Moon Cube

National government programme

Team leader on the rewrite of a legacy system to React 19 and TypeScript, with GitHub pipelines and end-to-end tests.

Before Moon Cube

Online trading platform

Angular development on a platform with millions of users.

Client names are withheld. Named references need written consent.

Products we run

Erevna

Surveys and forms

Katalogos

Online menus

Kefi

Event pages with custom domains

Our own products, live on one multi-tenant platform we operate.

Who does the work

Demetrios Loizides

MEng Mechanical Engineering, First Class, University of Sheffield. Certified Professional Ethical Hacker. Based in Nicosia, Cyprus; works remotely.

Demetrios LoizidesFounder

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