About Fivecircles

Enterprise architecture for complex operating environments.

Fivecircles Tech Inc is a Canada-based engineering company founded by Tony Xu, Principal Enterprise Architect, to deliver modernization, integration, and implementation for mission-critical digital ecosystems.

The practice draws on more than 30 years of enterprise technology experience across government, healthcare, telecommunications, manufacturing, finance, blockchain, digital advertising, logistics, utilities, cloud, and AI-enabled systems.

Systems architecture and analytics workspace

Architecture Principles

Modernization must strengthen business continuity, not disrupt it.

Incremental Modernization

Legacy transformation, modernization roadmaps, API-first architecture, and phased migration that preserve critical workflows.

Architecture Governance

Enterprise architecture, solution design, technology selection, release governance, and design/code review for durable delivery.

Secure Delivery

Least privilege, Microsoft Entra ID integration, Zero Trust-aligned access, OWASP-aware practices, auditability, and privacy-aware implementation.

High-Scale Platforms

Microservices, distributed systems, event-driven architecture, horizontal scale, high availability, and low-latency design.

Enterprise Integration

REST, gRPC, GraphQL, API versioning, EDI, SAP interfaces, data pipelines, and identity integration across complex ecosystems.

Practical Handover

Clear runbooks, operational support, stakeholder communication, mentoring, and documentation that lets teams own the system with confidence.

Enterprise technology evolves continuously. Mission-critical business cannot stop.

Our approach is pragmatic, incremental transformation: adopt modern platforms, APIs, automation, cloud-native patterns, DevSecOps, and AI while preserving the stability, performance, security, and institutional knowledge that operations depend on.