High-Performance API Development & Integration Services
Connect software systems with rock-solid, high-throughput APIs. Virtual Agency designs and engineers secure RESTful and GraphQL APIs, event-driven webhooks, and third-party middleware that allow your applications to communicate reliably at scale.
Engineered for Developer Experience & High Throughput
We build clean, predictable, and heavily documented APIs that other engineering teams love consuming.
RESTful & GraphQL API Engineering
Custom endpoints designed around strict standards (JSON:API / GraphQL schemas) with predictable error handling and pagination.
- GraphQL flexible querying eliminating over-fetching of data
- Cursor-based pagination for high-volume dataset queries
- Strict HTTP status code usage and standardized JSON errors
API Security, Auth & Rate Limiting
Protect your backend services from abuse, DDoS, and scraping with API keys, OAuth2 token authentication, and Redis rate limiters.
- Sliding-window Redis rate limiting per user / API key
- Cryptographic HMAC signature validation for webhooks
- Role-based permission scopes (e.g. read:orders, write:billing)
Developer Portals & OpenAPI Specs
Comprehensive developer documentation with interactive Swagger UI, code samples, and automated SDK generation.
- Automated OpenAPI 3.0 specification generation
- Interactive testing playground with mock sandbox servers
- Versioned endpoints supporting non-breaking backwards compatibility
API Infrastructure Stack
Asynchronous architectures built for high concurrency.
Node.js & FastAPI
Asynchronous event-loop backends capable of serving tens of thousands of requests per second.
Redis Cache & Queues
In-memory response caching and asynchronous job offloading for heavy operations.
Kong / AWS API Gateway
Enterprise gateway handling SSL termination, throttling, and request routing.
PostgreSQL & ClickHouse
High-speed relational data queries and high-volume API analytical event logging.
Our Systematic Delivery Process
From discovery to production deployment, we maintain strict agile milestones, automated code reviews, and complete transparency.
Discovery & Architecture
We audit business requirements, map entity relationships, define API specifications, and design interactive prototypes before writing production code.
Agile Sprint Engineering
Bi-weekly sprints with continuous integration, automated unit testing, and live staging previews where you test each module hands-on.
Security & Load Testing
Rigorous penetration testing, OWASP vulnerability scans, database query indexing, and load tests simulating peak concurrency.
CI/CD Deployment & SLAs
Automated zero-downtime deployment to your private cloud, comprehensive staff onboarding, and ongoing 24/7 technical support SLAs.
Frequently Asked Questions
Clear answers regarding architectural ownership, integration timelines, security protocols, and operational delivery.
Should our API be built using REST or GraphQL?
It depends on your use case. REST is best for public partner APIs, standard CRUD services, and webhooks due to universal HTTP caching and broad tooling. GraphQL is ideal for complex mobile apps and frontends that need to retrieve nested relational data in a single request without over-fetching.
How do you handle API versioning when new features are added?
We implement URI path versioning (e.g. /v1/, /v2/) or header-based versioning, strictly maintaining backwards compatibility for existing integrations while providing clear deprecation timelines for legacy endpoints.
How do you protect public APIs against brute-force attacks and DDoS?
We deploy multi-tier protection including Cloudflare WAF, sliding-window Redis rate limiting, IP reputation filtering, and mandatory HMAC-SHA256 signature validation on webhook payloads.
Do you provide SDKs for third-party developers consuming our API?
Yes. Based on your OpenAPI specification, we can generate and maintain idiomatic client libraries in TypeScript/JavaScript, Python, and PHP.
Plan Your Technology Architecture
Schedule a confidential discovery session with our senior full-stack architects to review your technical requirements and scope deliverables.