Legal — UK immigration
Zam Legal Associates
A clear, credible website for an IAA-regulated UK immigration practice — services, fees and consultations in one calm, professional place.
Remote · Worldwide
API & Web Integration DevelopmentAPIs & Integrations
Systems that talk to each other — reliably, with proper error handling.
We build and wire third-party API integrations, custom REST and GraphQL APIs, webhook handlers, and the middleware that connects your web platform to external services.
(01) The short answer
What is apis & integrations?
API and integration development connects separate software systems so data flows between them reliably — a website that triggers a CRM update on form submission, an ecommerce store that syncs inventory with a warehouse system, or a client portal that pulls live data from an ERP. Cortexley builds these integrations as part of larger web projects and as standalone integration work, covering REST, GraphQL, webhook pipelines, and OAuth flows.
(02) Cost & timeline
How much does apis & integrations cost?
A single third-party API integration typically costs £800–£2,000. Multi-system integrations with error handling and monitoring typically cost £2,000–£5,000.
(03) Related services
Other web development work
(04) What's included
Scope, without the fine print.
- 01Third-party API integration (CRM, ERP, payments, logistics)
- 02Custom REST and GraphQL API development
- 03Webhook ingestion and event pipeline architecture
- 04OAuth and API authentication flows
- 05Middleware and integration layers for legacy systems
- 06Error handling, retry logic, and monitoring
Built withNext.jsReactTypeScriptLaravelWordPressTailwind CSS
(05) How the engagement runs
From brief to launch.
Discovery
We clarify scope, content model, and integration points before estimating.
Architecture
Route structure, data model, and CMS schema defined up front to avoid rework.
Build
Component-based development with staging environments from week one.
QA & launch
Accessibility pass, performance testing, and a supervised go-live.
Iterate
Post-launch analytics review and a backlog of prioritized improvements.
(06) Proof
Related work.
Luxury fragrance
DYNAMO Perfumes
An editorial, magazine-style Shopify storefront for a luxury fragrance house — custom Horizon theme, no sliders, no generic sections.
Retail softwareProduct
RetailPOS
An offline-first, multi-industry POS desktop app with eight industry presets, double-entry accounting and 16+ exportable reports.
(07) From the blog
Further reading.
Software · 7 min read
How to Choose a Web Development Agency: 8 Questions That Actually Matter
Most agency selection advice focuses on portfolios and pricing. The questions that reveal whether a team will actually deliver are different.
Read article →Software · 7 min read
What Makes a Good Software Development Partner (And How to Spot a Bad One)
The difference between a software partner that ships what you need and one that ships what you said isn't obvious from a proposal. Here's what to look for.
Read article →Software · 7 min read
How Much Does a Website Cost in 2026? A Real Breakdown by Project Type
The honest answer: $500 to $150,000+ depending on what you're actually building. Here's a breakdown by project type — with the real variables that move the number.
Read article →(08) Questions
Before you ask.
CRM integrations (HubSpot, Salesforce, Pipedrive), payment gateways (Stripe, PayPal, Adyen), shipping and logistics APIs (DHL, FedEx, ShipStation), ERP and inventory systems, marketing platforms (Klaviyo, Mailchimp), and custom internal APIs. If it has a documented API, we can integrate it.
A single, well-documented third-party API integration with standard OAuth and webhook handling: 1–3 weeks. A complex multi-system integration with error handling, retry logic, data mapping, and monitoring: 4–8 weeks. We quote per integration after reviewing the API documentation.
We build integrations with explicit error handling, retry logic for transient failures, and alerting for persistent ones. For production integrations, we include monitoring setup as part of the build — not as an afterthought. We also document the failure modes and recovery steps so your team knows what to do if something surfaces outside business hours.
(09) Start here
Tell us what you're building.
A founder reads every brief and replies within one business day with honest next steps and a fixed-price proposal.
sales@cortexley.com