API Development & Integrations

Interfaces other teams can build against, and connections that hold when things go wrong.

Overview

Integration is where most systems actually fail, and usually not in the happy path — it is the timeout, the partial write, the schema that changed without notice. Nextherrion designs APIs as products with a contract worth depending on, and builds integrations that treat failure as an expected condition rather than an exception.

API design and delivery, third-party and enterprise integration, and the middleware, contracts and error handling that keep connected systems honest.

API Design & Development

APIs treated as products: a considered contract, documentation that matches behaviour, and versioning that does not break consumers.

Third-Party Integrations

Connecting to external services with their rate limits, outages and breaking changes handled deliberately rather than discovered in production.

Enterprise System Integration

Moving data between the systems a business runs on, with clear ownership of which one holds the truth when they disagree.

API Design & DevelopmentThird-Party IntegrationsEnterprise System IntegrationAPI Gateway & Management

Event-Driven IntegrationData SynchronizationLegacy System ConnectivityAPI Documentation & Developer Portals

WHAT WE DO

API & Integration Services We Offer

API Gateway & Management

Authentication, rate limiting, routing and usage visibility in one place, instead of reimplemented behind every endpoint.

Event-Driven Integration

Publishing and consuming events where systems should react rather than poll, with delivery guarantees stated rather than assumed.

Data Synchronization

Keeping records consistent across systems, including the harder half — conflict handling, ordering and recovery after an outage.

Legacy System Connectivity

Reaching systems that predate modern interfaces, through adapters or intermediate services, without rewriting them first.

API Documentation & Developer Portals

Documentation generated from the contract, so it stays true, and a place for consumers to find it without asking someone.

OUTCOMES

What Good Integration Changes

Integrations rarely fail in the happy path. What separates a reliable one is how it behaves on the timeout, the duplicate and the partial write.

Systems that stay in step
Failures contained, not propagated
Contracts consumers can rely on
Less coordination between teams
Outages that recover on their own
Integration behaviour you can see

FAQ

Frequently Asked Questions

REST, GraphQL or events?

Driven by the consumers. REST suits most service-to-service work, GraphQL earns its complexity with varied client needs, and events suit reacting to change rather than asking for it.

How do you handle a third-party outage?

With retries, backoff, queueing and a defined degraded behaviour. The design question is what your system should do while the other one is down.

Can you integrate a system with no API?

Usually, through file exchange, database access or an adapter layer. It is more fragile than a real interface, and that trade is made explicitly.

How do you avoid breaking existing consumers?

Versioning and additive change. Breaking changes get a migration path and a deprecation window rather than an announcement.

Which system owns the data?

The most important question in any integration, and one we settle during design. Two systems both believing they own a record is the root of most sync problems.

How do we know an integration is healthy?

Monitoring on throughput, error rates and lag — so a failing integration is noticed before a customer reports the consequence.

TECHNOLOGY