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Your API Partner

Accelerate your sales stack with custom API development
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Who We Are

At River API, we’re a UK-based API integration & development company with a laser focus on digital transformation for your business. Our experts help companies envision their future state, create step-by-step transition plans, foster an API-first mindset, and incorporate AI solutions into their daily processes.

We work with product teams, SaaS platforms, and enterprises looking to streamline infrastructure, connect data across systems, and unlock value with AI. From custom API gateways to autonomous AI agents, River API builds the connective tissue modern businesses run on.

From technological chaos to intelligent automation – let's connect the dots.

OUR CORE FOCUS

Custom APIs Development. Seamless API Integration Services

Your tech stack doesn’t need more patches. It needs structure. At River API, we help UK businesses streamline their operations by building clean, reliable APIs that connect systems the right way.

Custom API Integration & Development

Whether you’re exposing services or consuming them, we design APIs that are clean, reliable, and ready for scale. REST, GraphQL, Webhooks: our senior software engineers choose the right approach for your system, then build it like it’s mission-critical. Because it usually is.

Third-party API Integration Service

Stripe, Salesforce, Twilio, Xero, HubSpot: you name it, and River API service provider plugs it in. We handle authentication, data flow, and edge cases without breaking your stack. If you’ve got too many tools talking over each other, we’ll structure clean, reliable communication between systems so data flows exactly where it should.

Cloud Integration

Running multiple services across AWS, Azure, or GCP? We connect your cloud infrastructure cleanly, securely, and with architecture that won’t unravel the second traffic spikes.

Microservices & Cloud-Based APIs

The River API team helps businesses split legacy systems into modular, API-connected microservices that move faster, scale easier, and play nice with your front-end, your CRM, and everything in between.

Data Synchronisation

If your data is out of sync, your business is too. At our UK-based API development company, we build real-time and scheduled sync services that make sure your records, reports, and analytics stay clean across tools, platforms, and users.

AI SOLUTIONS

AI-Powered Solutions That Solve Real Business Problems

At River API, we help UK businesses turn AI into a core part of their infrastructure, not just a side project. From decision automation to adaptive workflows and predictive analytics, our devs build systems that think faster and act smarter without slowing your team down.
1

AI-Powered API Management

We layer intelligence into your API lifecycle, including but not limited to automated testing, dynamic throttling, adaptive rate-limiting, and anomaly detection, so you can run smarter services with less manual oversight.
2

AI-Powered Workflow Automation

As an API service provider, River API builds workflows that don’t just automate tasks but respond to context. Trigger actions based on user behavior, data shifts, or predictive logic, without relying on fragile if/then chains.
3

Intelligent Decision Automation

Use machine learning to make better calls faster. From credit scoring to routing logic, River API embeds AI models that assess, decide, and act without waiting for someone to click “approve".
4

AI-Driven API Security & Compliance

Security should adapt as fast as threats do. Our AI engineers use machine learning to monitor API traffic patterns, flag anomalies, and maintain compliance without constant human triage.
5

AI Smart Data Sync & Optimisation

Stop wasting time syncing bad data. At River API, we assist businesses in using AI to clean, match, and optimise records before they flow through your systems so that what lands in your dashboards is usable.
6

AI-Powered Analytics & Reporting

Move past static dashboards. We build reporting systems that surface trends, predict shifts, and suggest actions automatically, in real-time, and adjust to the metrics that move your business.

Client Feedback

Latest Cases

API Orchestration for a Logistics Company

API Orchestration for a Logistics Company

This case demonstrated how creating an orchestration layer allows for unified access to various external services. A middleware solution was implemented in a short time, combining four separate APIs into a single interface with error handling logic, retries, and a notification system for administrators. This increased system stability and reduced downtime in critical processes.
Development of a marketing website for a B2B SaaS

Development of a marketing website for a B2B SaaS

This case enabled the implementation of an effective marketing tool for a B2B platform. The website was completely updated to meet modern performance, SEO, and analytics requirements. The architecture was based on a headless CMS, which ensured scalability, easy content management, and fast page loading.
AI Document Sorting Tool

AI Document Sorting Tool

This case demonstrated how AI tools can significantly reduce document processing time. A solution based on NLP and machine learning was implemented that automatically analyses PDF files, extracts structured data, and classifies them. This approach freed employees from routine verification and reduced the time spent on weekly information processing.
Bullhorn Integration with CMS without iframe

Bullhorn Integration with CMS without iframe

This case allowed us to see how effective a full-fledged API connection can be without using an iframe. As part of the solution, a CMS integration was built with the Bullhorn REST API, which made it possible to automatically publish vacancies, receive candidate applications, and synchronise statuses in both systems. As a result, a significant reduction in manual labour and an acceleration of recruitment processes.
Custom API Integration for Field Service

Custom API Integration for Field Service

This case showed the importance of precise synchronisation between internal company systems and third-party platforms. A custom API integration was implemented that connects the task scheduling system with CRM. The integration included authentication via tokens, error handling mechanisms, and data matching algorithms. This ensured stable information exchange and reduced the number of errors in field service processes.

Why Choose River API as Your API Development Agency?

Clients come to River API for deep technical expertise but what keeps them around is how we align API architecture with real business objectives and AI. Our software engineers don’t just build endpoints, they design systems that scale, stay secure, and serve your long-term roadmap.
1
Business-Driven Development
Every integration supports a clear business outcome. We stay focused on what moves the needle, not just what looks impressive in a demo.
2
Clear Communication
You get full visibility at every stage: roadmaps, timelines, blockers, decisions.
3
Predictable Timelines, Real Budgets
Our API development company scopes with intent and delivers on what we promise.
4
Security
Built In
From authentication to data handling, our API developers embed security from day one. Clean, maintainable code backed by best-practice security protocols.
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River API is the leading API developer in the UK. We offer end-to-end API integration and API development services combined with smart AI solutions based on a security-first approach. Let’s connect!
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