AI-first engineering

API development and integration services.

Logiciel provides API development services for companies building digital products, modernizing applications and connecting complex system environments. From API strategy and architecture to custom API development, third-party integration, testing, security and managed operations, we help teams create reliable interfaces that improve interoperability, reduce manual work and support future product growth.

Book an Intro Call Common Questions

5 steps

API development framework

3 models

Engagement models to deliver the work

Why Logiciel

Why API Development Services Matter.

Why Logiciel · 01

APIs allow customer applications, internal systems and partner platforms to exchange information and perform defined actions.

Why Logiciel · 02

One-off integrations can create duplicated business logic, inconsistent data handling and growing maintenance effort.

Why Logiciel · 03

Poor documentation can make connected services difficult for internal and external developers to understand.

Why Logiciel · 04

Weak authentication, permissions and secret handling can expose sensitive data or business-critical functionality.

Why Logiciel · 05

Slow responses, versioning issues and limited failure visibility can affect several connected products at once.

Why Logiciel · 06

AI-enabled products and agents require secure interfaces for retrieving approved information and performing controlled actions.

Why Logiciel · 07

Business leaders need API engineering that improves architecture, security, reliability, documentation and long-term maintainability.

What you get

What You Get When You Work With Logiciel on API Development.

We embed senior API engineers into your roadmap while your organization retains ownership of the product, source code, data, infrastructure and technical decisions.

An API development roadmap

aligned with product, integration and modernization priorities

Senior engineers matched

to your applications, data sources and technology environment

Clear API architecture

reusable interfaces and maintainable data contracts

Secure authentication

authorization, encryption and access-control foundations

Reliable integrations

with internal applications and third-party platforms

Automated functional

integration, contract, performance and security testing

Monitoring

documentation, versioning practices and an operating model your team can maintain after launch

What we build

API Development Solutions Built for Connected Products.

API Strategy and Architecture

System assessment, workflow analysis, dependency mapping, interface planning, versioning strategy and phased delivery roadmap.

Custom API Development

Custom interfaces designed around your product capabilities, business workflows, data requirements and integration environment.

REST and GraphQL API Engineering

RESTful and GraphQL APIs with structured endpoints, schemas, authentication, error handling and maintainable access patterns.

SaaS and Enterprise Integration

Connections across CRM, ERP, identity, payment, communication, analytics and other business-critical platforms.

Legacy System API Enablement

Modern API layers around established applications so they can connect with new products without an immediate full rebuild.

API Security, Gateway and Quality Engineering

Authentication, authorization, rate controls, gateway policies, automated testing, monitoring and production hardening.

AI-Ready and Managed API Operations

Interfaces supporting controlled AI workflows, followed by monitoring, maintenance, version management and continuous improvement.

Engagement

Engagement Models Designed for API Delivery.

Dedicated API Engineering Squad

A standing team of API architects, backend developers, QA specialists, cloud engineers and integration experts embedded into your roadmap.

Engagement

API Advisory and Team Extension

Senior API and integration specialists who strengthen your internal backend, platform, quality, cloud or engineering teams.

Engagement

Outcome-Based API Development

Fixed-scope engagements with defined outcomes, milestones and success criteria for APIs, third-party integrations, legacy enablement or API modernization.

Engagement

Under the hood

API Development and Integration Services We Deliver.

API Diagnostic and Roadmap

What it meansDetailed assessment of applications, workflows, data sources, integrations, dependencies, security requirements and technical risks.

Custom REST and GraphQL Development

What it meansSecure custom APIs with structured endpoints, schemas, authentication, validation, error handling, documentation and versioning.

SaaS and Enterprise Integration Engineering

What it meansIntegration with CRM, ERP, identity, payment, communication, analytics, customer and partner platforms.

Third-Party and Legacy System Integration

What it meansExternal API integration and API enablement for established applications, including retries, rate limits, transformation and failure handling.

Microservices and API Gateway Engineering

What it meansService boundaries, communication patterns, routing, traffic management, authentication, rate limiting and centralized policy enforcement.

API Security, Testing and Reliability Engineering

What it meansAccess controls, encryption, secret management, contract testing, performance validation, logging, observability and resilience.

Managed API Operations

What it meansOngoing monitoring, incident response, integration maintenance, version management, performance optimization and continuous API development.

Insights

API Development Insights & Frameworks.

Patterns from our API, backend, cloud and platform engineering teams that help companies move from fragile integrations to reusable, reliable interfaces.

↳ Insights

API Engineering Operating Model

How we structure API ownership, design standards, version governance, quality gates, monitoring, documentation and continuous improvement.

↳ Insights

API and Integration Readiness Framework

A practical approach to ranking API priorities by product value, system dependency, data sensitivity, integration complexity, usage scale and operational risk.

↳ Insights

How we work

Our API Development Framework.

System and Workflow Diagnostic

API and Data Contract Design

API and Integration Engineering

Quality, Security and Production Hardening

API Engineering Operating Model

Resources

Insights for tech leaders.

Whitepaper · PDF

EHR Integration Reality: What the Documentation Does Not Cover and Your Engineers Will Hit

Whitepaper · PDF

AI - Powered Product Development Playbook

Whitepaper · PDF

Your Highest-Intent Buyers Are Sitting in Your CRM Four Times

Questions

Frequently asked questions.

What do API development services include?

API development services can include API strategy, architecture, custom API development, third-party integrations, authentication, automated testing, documentation, deployment and managed operations.

What is custom API development?

Custom API development involves building interfaces specifically around an organization’s products, data, workflows and integration requirements.

What does an API development company do?

An API development company designs, builds, tests, deploys and maintains interfaces that allow applications and systems to exchange data and perform defined actions.

Can Logiciel integrate third-party APIs into an existing product?

Yes. Logiciel can integrate payment, identity, CRM, ERP, communication, analytics and other third-party services into existing applications.

Can Logiciel modernize legacy system integrations?

Yes. Logiciel can introduce API layers, replace point-to-point connections and improve data contracts without requiring an immediate full-platform rebuild.

How does Logiciel secure APIs?

Logiciel can implement authentication, authorization, encryption, rate controls, secret management, audit logging and secure development practices based on product requirements.

Does Logiciel provide API testing?

Yes. Logiciel can implement automated functional, integration, contract, performance and security testing for critical API workflows.

How is Logiciel different from other API development companies?

Logiciel works as an embedded engineering partner. Your organization retains ownership of the APIs, source code, data, infrastructure and technical decisions.

Who owns the APIs and deliverables?

Your organization retains full ownership of the source code, API specifications, automated tests, infrastructure configurations, documentation and other agreed deliverables.

Does Logiciel provide ongoing API support?

Yes. Ongoing support can include monitoring, incident response, integration maintenance, version management, performance optimization and continuous API development.

Let's build

Build APIs That Make Your Products Work Better Together.

Connect applications, data and business systems with secure APIs built by a senior engineering team that works inside your existing delivery model.

Start an API Development Call

API development and integration services.

See Logiciel in action.

Why API Development Services Matter.

APIs allow customer applications, internal systems and partner platforms to exchange information and perform defined actions.

One-off integrations can create duplicated business logic, inconsistent data handling and growing maintenance effort.

Poor documentation can make connected services difficult for internal and external developers to understand.

Weak authentication, permissions and secret handling can expose sensitive data or business-critical functionality.

Slow responses, versioning issues and limited failure visibility can affect several connected products at once.

AI-enabled products and agents require secure interfaces for retrieving approved information and performing controlled actions.

Business leaders need API engineering that improves architecture, security, reliability, documentation and long-term maintainability.

What You Get When You Work With Logiciel on API Development.

An API development roadmap

Senior engineers matched

Clear API architecture

Secure authentication

Reliable integrations

Automated functional

Monitoring

API Development Solutions Built for Connected Products.

API Strategy and Architecture

Custom API Development

REST and GraphQL API Engineering

SaaS and Enterprise Integration

Legacy System API Enablement

API Security, Gateway and Quality Engineering

AI-Ready and Managed API Operations

Engagement Models Designed for API Delivery.

Dedicated API Engineering Squad

API Advisory and Team Extension

Outcome-Based API Development

API Development and Integration Services We Deliver.

API Diagnostic and Roadmap

Custom REST and GraphQL Development

SaaS and Enterprise Integration Engineering

Third-Party and Legacy System Integration

Microservices and API Gateway Engineering

API Security, Testing and Reliability Engineering

Managed API Operations

API Development Insights & Frameworks.

API Engineering Operating Model

API and Integration Readiness Framework

Our API Development Framework.

Insights for tech leaders.

EHR Integration Reality: What the Documentation Does Not Cover and Your Engineers Will Hit

AI - Powered Product Development Playbook

Your Highest-Intent Buyers Are Sitting in Your CRM Four Times

Frequently asked questions.

Build APIs That Make Your Products Work Better Together.