architecture

Microservices architecture decomposes systems into independently deployable services aligned with business domains. Plan service boundaries using Domain-Driven Design, define API contracts, implement service discovery and load balancing, and design for 10x growth by anticipating bottlenecks in data flow, deployment topology, and inter-service communication patterns.

Legacy modernization uses strangler pattern and incremental service extraction guided by business value and technical risk. Identify high-friction domains, isolate them as new services with clear API boundaries, route traffic gradually, and maintain backward compatibility during transition. This approach reduces risk while preserving working systems.

Security-first architecture embeds threat modeling, authentication/authorization patterns, encryption boundaries, and compliance requirements into service design. Define security zones, isolate sensitive data flows, implement defense-in-depth across infrastructure and APIs, and establish audit trails before implementation begins.

Domain-Driven Design and microservices align naturally; DDD's bounded contexts map to service boundaries, and ubiquitous language informs API contracts. This combination ensures services reflect business domains, APIs remain stable, and cross-service communication follows intentional patterns rather than technical convenience.

DevOps infrastructure design coordinates deployment pipelines, containerization strategy, orchestration platforms, monitoring, and disaster recovery with architectural decisions. Align service topology with infrastructure capabilities, define scaling policies, establish observability requirements, and create runbooks before implementation to ensure reliability at scale.

Performance optimization must inform initial architecture decisions, not follow them. Identify scalability bottlenecks early—database queries, service communication latency, caching strategies—and design around them. Post-launch optimization is limited; architecture decisions made upfront determine whether the system can scale to 10x without fundamental redesign.