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API Development Services

API Development Services That Connect Every System

Contract-first APIs, partner integrations and event streams that let your apps, ERP, payment and data platforms share information securely and in real time.

  • 100+ global brands served
  • ISO 9001 & ISO 27001 certified
  • REST · GraphQL · Events
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API Console

orders-api · v2

Calls today1.2M
  • GET /orders/{id}p95 84 ms · 2xx 99.8%
  • POST /ordersRate limit 600/min
  • v1 consumersSunset in 60 days
View analytics
app.api console.com

API Console

orders-api · v2

Calls today1.2M
  • GET /orders/{id}p95 84 ms · 2xx 99.8%
  • POST /ordersRate limit 600/min
  • v1 consumersSunset in 60 days
View analytics
  1. 1Design
  2. 2Build
  3. 3Test
  4. 4Release

⟳ Design in progress

Faster workflows after ERP integration automation
50%
Faster workflows after ERP integration automation
Data accuracy across connected systems
3x
Data accuracy across connected systems
Less manual effort on integrations
40%
Less manual effort on integrations
Faster API testing setup with generative AI
50%
Faster API testing setup with generative AI
Contracts documented for every endpoint
OpenAPI
Contracts documented for every endpoint

Most businesses already own the data they need. It is just trapped in an ERP, a payment gateway, a legacy database or a partner's system. API development services free that data. They give every application a secure, documented way to read and act on it.

Our team at ICANIO designs, builds and runs APIs for internal apps, mobile clients and external partners. We write the contract first, generate documentation from it and protect every endpoint behind a gateway. We also build the integration flows that keep systems in sync.

This page covers API styles, architecture, security, common integration failures and our delivery process. It also includes a real ERP integration project and a checklist for choosing a partner.

What Are API Development Services?

API development services cover the design, build, testing, documentation and operation of application programming interfaces. An API is a contract. It defines what a system offers, what it expects and how errors are reported.

The work spans several layers. There are the APIs your own apps call, the public or partner APIs others consume, and the integration flows that move data between packaged systems such as ERP and CRM.

Modern APIs are usually RESTful and described with the OpenAPI Specification. GraphQL suits apps that need flexible queries. Event-driven interfaces, using queues or streams, suit work that should happen asynchronously.

Good API development services also plan for change. Versioning, deprecation notices and backward compatibility let you improve an API without breaking the apps and partners that rely on it.

Working definition

“API development services are the end-to-end engineering of documented, secure and versioned interfaces and integration flows that let applications, partners and data platforms exchange information reliably.”

API development services connecting web apps, ERP and partner systems through a secure gateway

Foundations

Principles Behind Every API We Ship

  1. 01 →

    Contract First

    The OpenAPI or AsyncAPI document is agreed before code, so client and server teams build in parallel.

  2. 02 →

    Secure by Default

    OAuth 2.0, scoped tokens, input validation and rate limits protect every endpoint.

  3. 03 →

    Observable

    Every call is traced and measured, so latency and errors are visible per consumer.

  4. 04 ↺

    Built to Evolve

    Clear versioning and deprecation policies let the API grow without breaking clients.

Core capabilities

API Development Services We Offer

Each service can stand alone or form part of a wider integration programme. All of our API development services share the same design and security standards.

API Strategy & Design

Resource modelling, OpenAPI contracts, naming standards and versioning rules. API development services start here, because a clean contract outlives any implementation.

Contract-first

REST & GraphQL APIs

Fast, well-tested APIs on Java, .NET, Node.js or Python. We pick REST for broad compatibility and GraphQL when clients need flexible, nested queries.

REST · GraphQL

ERP & Business System Integration

Connectors and sync flows for ERP, CRM and back-office tools. Our ERP integration automation used n8n, RabbitMQ Shovel and Apache Airflow for real-time data sync.

50% faster workflows →

Financial Data APIs

Secure APIs for transactions, reports and data feeds in banking and wealth management. Our CSV parser platform delivered wealth insights 50% faster through an API.

50% faster insights →

API Testing & Performance

Contract, functional and load testing in the pipeline. Our generative AI testing platform cut API test setup time by half and tripled coverage for dev teams.

3x test coverage →

API Gateways & Developer Portals

Gateway setup, key management, usage plans and self-service developer portals. These API development services suit fintech and open banking programmes that onboard partners.

Partner-ready →

Architecture

Architecture of Our API Development Services

We separate the public contract from internal services and from integration flows. Each layer can change at its own pace without breaking consumers.

01

Consumers

  • Web and mobile apps
  • Partner systems
  • Internal tools
  • Data platforms

02

Gateway & Security

  • OAuth 2.0 / OIDC
  • Rate limits and quotas
  • Request validation
  • Developer portal

03

API Services

  • REST endpoints
  • GraphQL layer
  • Webhooks
  • Versioned contracts

04

Integration & Data

  • Message queues
  • Workflow orchestration
  • ERP and CRM connectors
  • Operational databases
Closed-loop feedback: Gateway analytics and traces show which endpoints are slow, failing or unused. That data shapes the next version of the API.

Challenges we solve

Common API and Integration Failures

Integration problems are expensive because they break several systems at once. These are the ones we see most.

  1. 01

    Point-to-Point Spaghetti

    Every system wired directly to every other becomes impossible to change. We introduce a gateway and shared integration layer.

  2. 02

    Undocumented Endpoints

    Without docs, each new consumer needs a meeting. We publish OpenAPI docs and sandboxes for every API.

  3. 03

    Breaking Changes

    Silent field changes break partner apps. We version APIs and announce deprecations with clear timelines.

  4. 04

    Weak Authentication

    Shared keys and broad tokens invite misuse. We apply OAuth 2.0 scopes and follow the OWASP API Security Top 10.

  5. 05

    Lost Messages

    Network failures drop data between systems. We use retries, idempotency keys and dead-letter queues.

  6. 06

    Format Mismatches

    XML, CSV and JSON rarely line up cleanly. We validate and transform payloads at the integration boundary.

Types of APIs We Build

API development services cover four main interface styles. Many platforms use more than one.

  • 1Private APIs: Used by your own web and mobile apps. Optimised for your product and changed freely with your releases.
  • 2Partner APIs: Shared with selected suppliers, resellers or banks. Need onboarding, keys, quotas and stable contracts.
  • 3Public APIs: Open to any developer, often as a product. Need a developer portal, strong docs and careful versioning.
  • 4Event and integration APIs: Webhooks, queues and streams that push changes as they happen, such as ERP sync or order events.

REST vs GraphQL vs Event-Driven APIs

No single style fits every use. We recommend choosing per use case rather than per company.

CriterionRESTGraphQLEvent-driven
Broad tool support✓ YesPartialPartial
Flexible client queriesNo✓ YesNo
Real-time updatesPartialPartial✓ Yes
HTTP caching✓ YesPartialNo
Best forPublic and partner APIsComplex app screensSystem sync and workflows

Benefits of Professional API Development Services

Well-built APIs turn isolated systems into one connected business.

  • No more double entryBecause systems exchange data automatically.
  • Faster app deliveryBecause new apps reuse existing APIs instead of new integrations.
  • Better data accuracyBecause validation happens at one controlled boundary.
  • Easier partnershipsBecause partners onboard through docs and sandboxes.
  • Stronger securityBecause every call is authenticated, scoped and logged.
  • Room to growBecause versioned contracts let systems change independently.

Delivery

How We Deliver API Development Services

  1. Week 1–2

    Integration Discovery

    Systems, data flows, consumers and security needs mapped, with a prioritised list of APIs.

  2. Week 2–3

    Contract Design

    OpenAPI or AsyncAPI contracts reviewed with consumers and mocked for early testing.

  3. Week 3–9

    Build & Integrate

    Endpoints, connectors and flows built in sprints with contract and integration tests in CI.

  4. Week 9–11

    Harden & Launch

    Load tests, security checks, gateway policies and a developer portal before go-live.

  5. Ongoing

    Operate & Version

    Monitoring, consumer support, new versions and planned deprecations under an agreed SLA.

Case study

Case Study: ERP Integration Automation

A retail operation suffered from manual workflows, fragmented communication and errors between its ERP and MagOffice. ICANIO upgraded legacy packages and built a structured integration layer with orchestration, XML processing and real-time sync of receipts, billing and transactions. Workflows became 50% faster, data accuracy tripled and manual effort fell 40%.

Read the full case study →
01

Integration Layer

n8n · RabbitMQ Shovel

Data between the ERP and MagOffice flows through a structured, auditable delivery channel.

02

Orchestration

Apache Airflow

Scheduling, execution monitoring and dependency management run every automation pipeline.

03

Data Exchange

XML processing · Real-time sync

Payloads are parsed and validated, and every financial event is synchronised across systems.

More App Development Services

Specialist services within our mobile & web application development practice.

Choosing an API Development Partner

APIs last longer than the apps that first use them. Check these five things before you commit.

  1. 1Design maturity. Ask to see an OpenAPI contract and a versioning policy from past work.
  2. 2Integration depth. The partner should know ERP, payment and identity systems, not just HTTP.
  3. 3Security practice. Look for OAuth 2.0 expertise and testing against the OWASP API Security Top 10.
  4. 4Testing culture. Contract and load tests should run in the pipeline, not only before launch.
  5. 5Operational support. Confirm who monitors the APIs and handles consumer issues after go-live.

Our team judges API development services by one test: can a new consumer integrate from the docs alone, without a meeting?

API Security and Governance

APIs are now one of the most common attack surfaces. ICANIO designs every endpoint against the OWASP API Security Top 10, with object-level authorisation checks, input validation and rate limiting.

We use OAuth 2.0 and OpenID Connect for identity, mutual TLS where partners require it and secrets stored in a managed vault. Our API development services follow ISO 27001 certified processes.

For regulated data we design for the relevant rules, such as PCI DSS for card data or GDPR for personal data. Audit logs record who called what, and when, for every sensitive operation.

The Business Value of Good APIs

Count the manual steps that move data between systems today. Rekeying, exports and reconciliations all cost staff time and cause errors. That is the baseline good API development services remove.

Then count reuse. Each well-designed API can serve several apps and partners. The ERP integration project, for example, delivered 50% faster workflows and 40% less manual effort.

We recommend tracking API adoption, error rates and time to onboard a new consumer. Those numbers show how integration work turns into speed for the whole business.

Technology stack

Our API and Integration Toolkit

We use open standards and proven tools, so your APIs stay portable.

  • Specification

    • OpenAPI
    • GraphQL SDL

    AsyncAPIJSON Schema

  • Backend

    • Java / Spring Boot
    • .NET
    • Node.js

    Python FastAPI

  • Gateways

    • AWS API Gateway
    • Azure API Management

    Kong

  • Integration

    • RabbitMQ
    • Apache Kafka
    • Apache Airflow
    • n8n

  • Security

    • OpenID Connect
    • Keycloak

    OAuth 2.0mTLS

  • Testing

    • Postman
    • k6
    • JMeter

    Pact

Inside Our Integration Work

API development services architecture from consumers through gateway to integrations
Four layers from consumer to data
Six API development services from contract design to developer portals
Six services for connected systems
API development services delivery timeline from discovery to versioned operation
From contract to operation

Integration Guides From Our Team

Application Development white paper coverFree white paper · App DevelopmentApplication DevelopmentBuilding Enterprise-Grade Applications That Drive Digital TransformationGet the white paper →

API Development Services FAQs

What do your API development services include?

Design, build, testing, documentation, gateway setup and ongoing operation. We also build integration flows that connect ERP, CRM, payment and data platforms.

Should we use REST or GraphQL?

REST is the safer default for partner and public APIs. GraphQL helps when apps need many related objects in one call. Many platforms use REST externally and GraphQL internally.

How do API development services handle versioning?

We version contracts, keep old versions running for an agreed period and publish deprecation dates. Consumers get time and documentation to migrate.

Can you integrate our ERP with other systems?

Yes. Our ERP integration automation connected an ERP with MagOffice using queues, orchestration and real-time sync, with validated XML exchange.

How do you secure APIs?

OAuth 2.0 scopes, object-level authorisation, input validation, rate limits and full audit logs. We test against the OWASP API Security Top 10 before launch.

Do API development services include documentation?

Always. We publish OpenAPI-based reference docs, examples and a sandbox, so new consumers can integrate without waiting for our team.

App Development by Industry

How we deliver api development services and the wider app development practice in each sector.

Related Specialist Services

Key Takeaways

  • API development services turn isolated systems into one connected, automated business.
  • Design the contract first and publish it as living documentation.
  • Secure every endpoint with OAuth 2.0, scopes, validation and rate limits.
  • Version APIs deliberately so systems and partners can change independently.

Conclusion

Every modern product depends on APIs, whether customers see them or not. API development services that start with a clear contract and strong security give your business a foundation it can build on for years.

ICANIO designs and runs APIs for apps, partners, cloud data platforms and even IoT and machine learning workloads. We connect the systems you already own and make sure each integration is observable and recoverable.

If data is stuck between systems or partners are waiting on an integration, contact us. We will map your flows and propose the API development services that remove the bottleneck.

By ICANIO Application Engineering Team · Published · Updated

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Book a free discovery call. We will map your systems and data flows, then outline the APIs and integrations that will remove manual work.

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