An API gateway is a service that sits between clients and backend APIs, acting as a single entry point to route, secure, and manage all API traffic. This centralized API management layer handles authentication, rate limiting, transformations, and observability, simplifying how microservices are exposed and consumed at scale.
As architectures grow more distributed, directly exposing every microservice increases complexity and security risk. An API gateway simplifies client integration, centralizes security controls, and improves scalability, making it easier to evolve services independently while maintaining consistent policies, performance, and visibility across all APIs.
Clients send requests to the API gateway instead of directly calling backend services. The gateway authenticates the caller, applies policies (rate limits, schema validation, routing rules), and forwards traffic to the correct service instances, often with load balancing and caching. It logs each call, collects metrics, and can integrate with DevSecOps pipelines for automated policy deployment.
In BuildPiper’s architecture, the BP Gateway acts as the main entry point to the platform, efficiently distributing incoming traffic and protecting core services. Combined with BuildPiper’s DevSecOps features – secure pipelines, service discovery, and observability – the gateway helps teams expose microservices safely, standardize API access, and integrate security and compliance checks into their Kubernetes and multi‑environment delivery workflows.
In a microservices architecture, an API gateway is the single front door through which external and internal clients access multiple services. It hides service complexity, handles routing and protocol translation, and centralizes security, traffic control, and monitoring so teams can evolve services independently without breaking clients.
An API gateway improves security by enforcing authentication, authorization, input validation, and rate limiting before requests reach backend services. It can terminate TLS, filter malicious payloads, detect abnormal traffic, and log all access, providing a hardened perimeter and a single place to apply and audit security and compliance policies.
BuildPiper’s BP Gateway acts as the central access layer for its platform APIs, routing traffic to the UI and control plane while balancing load and protecting services. When teams manage microservices with BuildPiper, the platform’s gateway and security practices help standardize API exposure, embed policy checks into CI/CD, and improve observability across all API interactions.