API Development Company for Web, Mobile & Third-Party Integrations
APIs are the connective tissue of modern software. We design and build REST APIs, GraphQL APIs, and integration layers that are documented, versioned, secured, and built to handle what your users and partners actually do — not just what the happy path assumes.
600+
Projects Delivered99%
Satisfaction Rate8+
Years Experience
/api/v1/jobs/api/v1/jobs/create/api/v1/jobs/:id/status/api/v1/jobs/:idWhat APIs Actually Do (And Why They Matter)
Most software products today are systems of connected services rather than monolithic applications. APIs are what connects them.
Internal APIs
The interface between your frontend (web or mobile) and your backend. When a user logs into your app and sees their data, an internal API fetched that data. Every action in a web application — saving a record, processing a payment, sending a notification — goes through an API call. Well-designed internal APIs make your frontend faster to build, easier to change, and possible to extend to new clients (mobile app, partner integration) without rebuilding the backend.
Third-Party Integrations
Connecting your system to external services — Stripe for payments, SendGrid for email, Twilio for SMS, accounting platforms, carrier APIs, CRM systems, ERP systems. Most businesses underestimate how much of their software is integration work. Every third-party service your product relies on is an integration that needs to be built, tested, and maintained as that service updates its API.
Partner and Public APIs
APIs you expose to partners, enterprise clients, or developers building on your platform. A well-designed public API is a product in its own right — it needs documentation, versioning, authentication, rate limiting, and error handling that communicates clearly. Enterprise clients increasingly require API access as a condition of buying your product.
API Development Services
From simple internal APIs to complex integration platforms.
REST API Design and Development
Well-structured REST APIs following HTTP conventions — resource-based URLs, appropriate HTTP methods, consistent error responses, proper status codes. We design APIs that are intuitive for developers to consume, documented with OpenAPI/Swagger, and versioned from day one so you can make breaking changes without breaking existing clients.
GraphQL API Development
GraphQL APIs for applications with complex, nested data requirements. Clients fetch exactly the data they need — nothing more, nothing less. Particularly well-suited for SaaS products with complex domain models, mobile apps where bandwidth efficiency matters, and platforms serving multiple clients with different data requirements.
Third-Party API Integration
Integrating your application with external services — payment gateways, accounting platforms (Xero, QuickBooks, Sage), carrier APIs, CRM systems, ERP systems, communication platforms, and logistics APIs. Integration work is often more complex than it looks. We assess integration complexity accurately before including it in a project estimate.
API Gateway and Middleware
Authentication and authorization middleware, rate limiting, request validation, response transformation, caching layers, and API gateway configuration. The infrastructure layer that sits between your clients and your backend services — handling cross-cutting concerns so your application code doesn't have to.
Webhook Systems
Event-driven integrations where external services notify your system of events in real time — payment completed, shipment status changed, user signed up in a connected system. Webhook receivers, delivery verification, retry logic, and the queue infrastructure that makes webhook processing reliable at scale.
Legacy System Integration
Connecting modern applications to legacy systems that weren't designed for API consumption — older databases, SOAP web services, EDI systems, on-premise enterprise software. We've built integration layers that make legacy systems API-accessible without requiring their replacement. Sometimes the right solution is a carefully built adapter, not a rewrite.
How We Design APIs
API design decisions made early are expensive to change later. Here's how we approach them.
Version from day one
We add /api/v1/ to every API we build, even if we're not planning a v2 yet. When you inevitably need to make breaking changes — and you will — your existing integrations keep working. API versioning is a two-minute decision at the start that prevents weeks of painful migration work later.
Consistent error handling
Every API error response follows the same structure — status code, error code, human-readable message, and where relevant, field-level validation errors. Consistent errors are debuggable errors. APIs where error responses are inconsistent between endpoints frustrate developers and hide real problems.
Authentication done properly
We use JWT for stateless authentication in most APIs, with refresh token rotation for long-lived sessions. OAuth 2.0 for third-party authorization. API keys for partner integrations with proper scoping. We don't roll custom authentication schemes or use patterns that require the client to store sensitive credentials insecurely.
Document everything
Every API we build is documented with OpenAPI/Swagger specification. This serves as both human-readable documentation and a machine-readable contract that tools can use for client generation, testing, and validation. Documentation that lives in code rather than in a separate doc that someone forgot to update.
Why API Integrations Are More Complex Than They Look
"Just integrate with Stripe" or "just connect to our ERP" are things clients say at the start of projects. Here's what integrations actually involve.
API documentation quality varies enormously
Some APIs have excellent documentation, interactive explorers, and sandbox environments. Others have documentation that's incomplete, outdated, or contradicts the actual API behavior. Carrier APIs in logistics, government APIs, and legacy enterprise APIs are frequently in the second category. We assess documentation quality before estimating integration work.
APIs change without warning
Third-party APIs update, deprecate features, and change behavior. Every integration is a dependency on an external system you don't control. We build integrations with change in mind — abstraction layers that isolate the integration point, monitoring that alerts when an integration fails, and clear processes for handling third-party API changes.
Error states are where complexity lives
The happy path of any integration is straightforward. The complexity is in the error states: what happens when a payment is partially processed before a network failure? What happens when a carrier API returns an unexpected response format? What happens when a webhook is delivered twice? We test error paths as thoroughly as the happy path.
Rate limiting and throttling
Every external API has rate limits. Some are generous. Some are not. A logistics platform integrating with 10 carriers needs to manage 10 different rate limits, 10 different quota structures, and 10 different approaches to handling 429 Too Many Requests responses. Rate limit management is infrastructure work that needs to be designed before it hits production.
Security and credential management
API keys, OAuth tokens, and credentials for external services need to be stored securely, rotated when they expire, and kept out of your codebase. We use environment variables, secrets management services (AWS Secrets Manager, HashiCorp Vault), and proper credential rotation processes. Credentials in code repositories have compromised real production systems.
Technologies We Use for API Development
API Frameworks
API Protocols
Infrastructure
Docs & Testing
APIs We've Built
Integration work across logistics, SaaS, and enterprise clients since 2017.
Multi-Integration API · SaaS · UKi-mve — Accounting and Lead Generation API Integrations
API integrations connecting the i-mve removals platform to Xero, QuickBooks, and Sage for accounting data synchronization, and to UK lead generation platforms including Compare My Move, PinLocal, and Getamover for automatic lead intake. Multiple third-party APIs, different authentication schemes, different data formats — unified into a consistent integration layer.
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IoT API Platform · Hardware Integration · AustraliaParkezi — Hardware-to-Cloud API Infrastructure
REST API infrastructure connecting ANPR cameras, payment terminals, and access control hardware to a cloud management platform. Real-time data ingestion from multiple hardware sources, webhook delivery for parking events, and a management API consumed by the web dashboard and mobile app. The API layer that makes smart parking work in practice.
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Research Data API · Healthcare · United StatesCOMPASS for Autism — Clinical Research API
API backend for a clinical research platform serving autism services researchers, consultants, and families at Ball State University. Multi-role authentication, data collection and reporting endpoints, and the API infrastructure that connects the research platform's different user types to a shared data model.
View platform →Common Questions About API Development
/api/v1/ is our default — it's explicit, easy to understand, and widely supported by tooling. We structure new APIs for versioning from day one even when v2 isn't planned, because breaking changes are inevitable in any API that evolves. When a breaking change is needed, we maintain the old version for an agreed deprecation period before removing it. Ready to build your API?
We've been building REST APIs, integration layers, and backend infrastructure for web and mobile applications since 2017. Tell us what you need to connect — we'll tell you how to build it properly.
Teamseven — API development company based in Lahore, Pakistan. Building REST APIs and integrations for US, UK, and Australian clients since 2017.