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HomeServicesAPIs & Integrations
API Engineering

APIs Built for
Reliability at Scale

REST APIs, GraphQL, third-party connectors, webhook systems, and event-driven architectures — designed for reliability, observability, and developer experience.

Start Your Project View Our Work

What's included

REST API Design & Build
GraphQL APIs
Third-Party Integrations
Event-Driven Systems
Webhook Infrastructure
API Gateway & Management
Trusted tech stack
Node.jsNestJSFastAPIGraphQLPostgreSQL
150+
Projects delivered
98%
On-time delivery rate
90+
Average Lighthouse score
10yr
Industry experience
4.9★
Average client rating
What We Build

Complete API and integration capabilities

From greenfield API design to complex enterprise integration layers — every type of integration handled.

REST API Design & Build

Well-structured, versioned, and documented REST APIs following OpenAPI standards with rate limiting, authentication, and developer-friendly error handling.

OpenAPIJWT / OAuth2Rate limiting

GraphQL APIs

Strongly typed GraphQL schemas with DataLoader for N+1 prevention, query complexity limiting, and persisted query caching for production performance.

GraphQLDataLoaderCode generation

Third-Party Integrations

Stripe, Twilio, SendGrid, Salesforce, HubSpot, SAP, and any other third-party API — integrated with proper error handling, retry logic, and audit trails.

Payment gatewaysCRM / ERPCommunication APIs

Event-Driven Systems

Kafka and RabbitMQ-based event streaming architectures for systems that need reliable, ordered, and auditable event processing at scale.

KafkaRabbitMQDead-letter queues

Webhook Infrastructure

Outbound webhook delivery systems with retry logic, signature verification, delivery logs, and developer-facing webhook management interfaces.

HMAC signingExponential backoffDelivery tracking

API Gateway & Management

Kong, AWS API Gateway, or custom gateway setup — with rate limiting, authentication, request transformation, and usage analytics.

KongAWS API GWDeveloper portal
Our Services

Every type of integration, handled

From API design through to production monitoring — a complete integration delivery service.

API Design

API Design

Good API design is a product decision, not a technical one. We design APIs that developers want to use — clear naming, consistent patterns, comprehensive documentation, and predictable error handling.

OpenAPI Specification

Machine-readable API contracts that generate documentation and client SDKs automatically.

Versioning Strategy

URL, header, or parameter-based versioning with deprecation lifecycle management.

Error Design

Consistent error response format with machine-readable codes and human-readable messages.

SDK Generation

Auto-generated TypeScript, Python, and other language SDKs from your OpenAPI spec.

Design Your API See Case Studies
Why CodeXCrew

What makes us different

01

Architecture-first thinking

We design the system before writing the code. Every project starts with a documented architecture review — so you never inherit hidden technical debt from short-sighted early decisions.

02

No surprises, no overruns

Fixed-scope projects come with firm estimates. Dedicated-team engagements get weekly burn reports. You always know exactly where your project stands and what it's costing.

03

Senior engineers only

We don't staff projects with juniors learning on your budget. Every engineer assigned to your project has at least 5 years of production experience in the relevant stack.

04

You own everything

Full IP ownership, source code, documentation, and infrastructure access on delivery. No vendor lock-in, no licensing fees, no dependency on us to keep your product running.

05

Design-dev in one team

Designers and engineers work together from day one — not sequentially. This eliminates the classic handoff gap where beautiful designs become impossible to build.

06

Remote-first, timezone-aligned

Our team spans multiple time zones but we align to yours. You'll have real overlap for live collaboration, not just asynchronous updates and morning surprises.

Case Studies

Work we've shipped

View All Projects
PropVaultWeb App · FinTech · Real Estate

PropVault — Real Estate Investment Platform

Fractional real estate investment platform allowing retail investors to purchase ownership stakes in commercial and residential properties starting from PKR 25,000.

2.4B
PKR in properties listed (6 months)
4,800
Registered investors
340
Secondary market trades, zero errors
View Case Study
NovaMed HealthSaaS · HealthTech

NovaMed — Telemedicine SaaS Platform

Full-stack telemedicine platform connecting patients with licensed physicians for video consultations, prescription management, and ongoing care coordination.

3,200
Patients in first 90 days
98.7%
Video call success rate
4.7/5
Patient satisfaction score
View Case Study
LogiTrackWeb App · Logistics

LogiTrack — Freight & Logistics Operations Platform

Real-time fleet operations platform for 340 trucks — reducing manual dispatch calls by 78% and improving fleet utilization from 67% to 88%.

31%
Fleet utilization improvement
78%
Reduction in dispatch calls
4.6/5
Client satisfaction score
View Case Study
Technologies

Our Technology Stack

We use the best modern tools — selected per project for performance, maintainability, and scale.

React
UI library for building interactive interfaces
Primary
Next.js
Full-stack React framework with SSR/SSG
Primary
Vue.js
Progressive JavaScript framework
Expert
TypeScript
Typed JavaScript for safer, scalable code
Primary
Tailwind CSS
Utility-first CSS framework
Primary
Svelte
Compile-time reactive UI framework
Expert
Figma
Collaborative UI design tool
Tooling
JavaScript
ES2024+ with modern patterns
Foundation
FAQ

Questions we hear often

Can't find what you're looking for? Reach out directly — we're happy to answer anything.

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web application

Tell us what you're building. We'll respond within one business day with a tailored plan — not a generic pitch.

Free 30-minute discovery call
Detailed project estimate within 48 hours
NDA signed before any sensitive discussion
No commitment until you're fully comfortable

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We'll get back to you within one business day.

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