System Integration · Paris & France

Connect your application ecosystem without friction

Your systems don't talk to each other? Fragile batch flows, desynchronized data between ERP and e-commerce, artisanal connectors impossible to maintain. We architect and build the integrations that make your IS work reliably and observably.

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They trust us

The challenge

Why rethink your IS integrations

IS integrations are often the most fragile and least visible part of your ecosystem:

  1. 01 Fragile nightly batch flows: one missed CSV file = stock desynchronized for 24 hours
  2. 02 Artisanal connectors: cron scripts without monitoring, retry, or documentation
  3. 03 Desynchronized data: e-commerce stock doesn't match ERP stock
  4. 04 No visibility: impossible to know if a flow worked without manual verification
  5. 05 Excessive integration time: connecting a new system takes 6 months
  6. 06 Cascading failures: when the ERP is down, the entire e-commerce is impacted
  7. 07 Single person dependency: only the developer who wrote the connector understands it
  8. 08 Growing maintenance costs: each new system adds exponential complexity
Architecture

Technical overview

Architecture headless e-commerce

Découplage front / back avec middleware BFF, services métier headless et intégrations SI

Front Headless
Middleware / BFF
Services Métier Headless
Intégrations SI
Content APICommerce APIProduct APISearch APIPaiementCommandesLogistiqueSync produits
Next.js / AstroSSR, SSG, ISR
App MobileReact Native, Flutter
PWA / SPAOffline, push
CDN & EdgeCloudFront, Fastly
BFF / API GatewaySymfony, Node.js
Cache & InvalidationRedis, Varnish
CMS HeadlessContentful, Strapi, Payload
E-commerceShopify, commercetools, Sylius
PIMAkeneo
SearchAlgolia, Meilisearch
PSPAdyen, Stripe
ERPCegid, SAP
OMS / WMSManhattan
iPaaSMulesoft
Source
Traitement
Service
Sortie

Solution comparison

IS solutions: our integration expertise

We integrate the most demanding IS solutions on the market. Here is our field feedback:

Mulesoft (iPaaS)

Mulesoft (iPaaS)

Strengths
  • Complete enterprise integration platform
  • Pre-built connectors (SAP, Salesforce, etc.)
  • Integrated API management
  • Advanced monitoring and analytics
Limitations
  • Very high license cost
  • Implementation complexity
  • Specific skills required
Ideal for: Large enterprises with complex IS (> 10 systems) and advanced orchestration needs.
Cegid (ERP)

Cegid (ERP)

Strengths
  • Reference retail/luxury ERP in France
  • Integrated commercial and financial management
  • Available e-commerce connectors
  • French tax compliance
Limitations
  • Sometimes limited API
  • Uneven technical documentation
  • Expensive customization
Ideal for: French retailers and brands with integrated commercial management, inventory and accounting.
Manhattan (OMS/WMS)

Manhattan (OMS/WMS)

Strengths
  • Recognized WMS leader
  • Advanced multi-warehouse management
  • Omnichannel order orchestration
  • Ship-from-store, click & collect
Limitations
  • Complex integration
  • High cost
  • Long deployment
Ideal for: Omnichannel retailers with complex logistics (multi-warehouse, ship-from-store, international).
SAP (ERP)

SAP (ERP)

Strengths
  • World reference enterprise ERP
  • Exhaustive functional coverage
  • Vast partner ecosystem
  • SAP Commerce Cloud for e-commerce
Limitations
  • Very expensive
  • Heavy integration
  • Rare and costly skills
Ideal for: Large international groups with financial consolidation and complex supply chain needs.
No technology dogma. We recommend the solution best suited to your context, constraints and ambitions. Every choice is documented and justified.

Our methodology

How we deliver

Architects with twenty years behind them, and a delivery process instrumented by AI: scoping, code review, quality and security tooled at every phase. Each step produces concrete deliverables, and we stay through the run.

01
2 to 3 weeks

IS mapping & flow audit

Map your application ecosystem, identify existing data flows, assess their reliability and maintainability. Establish an objective diagnosis of your integration debt.
Deliverables
  • Application ecosystem mapping (ERP, OMS, WMS, CRM, e-commerce, etc.)
  • Existing integration flow inventory (batch, API, files, webhooks)
  • Flow reliability audit (error rate, latency, idempotency, retry)
  • Custom connector and maintainability analysis
  • Fragility points and operational risk identification
  • Integration solution benchmark (iPaaS, ESB, custom)
  • Recommendation report with prioritization and estimation
02
3 to 4 weeks

Integration architecture

Design the target integration architecture: exchange patterns, API contracts, error handling, monitoring. Align IT teams on a shared vision.
Deliverables
  • Target integration architecture (patterns: event-driven, API-first, ETL)
  • Exchange contracts per flow (format, frequency, volume, SLA)
  • Connector design (ERP, OMS, WMS, CRM, PSP)
  • Error handling strategy (retry, dead letter queue, alerting)
  • Integration monitoring design (dashboards, alerts, KPIs)
  • iPaaS layer specifications if applicable (Mulesoft)
  • Migration plan from existing flows to target
03
8 to 14 weeks

Connector build & migration

Develop connectors, implement flows, progressively migrate from existing integrations. Load testing and validation with third-party systems.
Deliverables
  • ERP connector development (Cegid, SAP) - orders, stock, prices
  • OMS/WMS connector development (Manhattan) - shipments, returns
  • CRM integration - customer sync, history, segments
  • iPaaS implementation (Mulesoft) if applicable - flow orchestration
  • End-to-end integration tests per flow
  • Load and resilience tests (what happens when the ERP is down?)
  • Progressive flow migration (old/new coexistence)
  • Technical documentation and runbook per connector
04
Ongoing

Monitoring, run & optimization

Deploy to production, monitor flows in real time, handle incidents, optimize reliability and performance. Support IS evolutions.
Deliverables
  • Real-time flow monitoring (volume, latency, error rate per connector)
  • Intelligent alerting (dynamic thresholds, automatic escalation)
  • Operational dashboards (360° view of IS integrations)
  • Integration incident handling procedures
  • Monthly flow health review (SLA, incidents, optimizations)
  • Support for IS evolutions (new system, new flow)
  • Monthly integration performance reporting

Business value

What you concretely gain

Expected results

Flow reliability > 99.5%

Time-to-integrate reduced by 50%

Maintenance costs reduced by 40%

  1. 01

    Flow reliability > 99.5%

    Intelligent retry, guaranteed idempotency, dead letter queues, proactive monitoring - your integration flows work reliably, even during temporary system outages.

  2. 02

    Time-to-integrate reduced by 50%

    Standardized integration architecture, reusable connectors, documented API contracts - adding a new system to the IS takes weeks instead of months.

  3. 03

    Maintenance costs reduced by 40%

    No more spaghetti connectors, fragile cron scripts and CSV files on an FTP. Standardized architecture, maintainable code, up-to-date documentation.

  4. 04

    360° visibility on your flows

    Real-time dashboards, intelligent alerting, end-to-end traceability - you know the state of your integrations at all times and are alerted before the business is impacted.

  5. 05

    Real-time synchronized data

    Event-driven architecture, reliable webhooks, near real-time sync - stock, orders, prices and customers are up to date everywhere, all the time.

  6. 06

    Resilience and automatic recovery

    Temporary system failures (ERP down, OMS timeout) are absorbed automatically. Retry, circuit breaker and dead letter queue ensure nothing is lost.

Client references

They trusted us with this type of engagement

Kering - Boucheron

Multi-system integration architecture: Cegid (ERP), Manhattan (OMS/WMS), multi-market PSP. Hybrid cloud AWS/AliCloud. Order, stock and shipment flow orchestration across 3 continents.

Christian Louboutin

Payment (Adyen), logistics and ERP flow integration. Real-time critical flow monitoring. Multi-zone Azure cloud architecture with IS connector resilience.

Frequently asked questions

Your questions, our answers

01 Do I need an iPaaS like Mulesoft or custom connectors?
It depends on the number of systems and flow complexity. An iPaaS is justified from 8-10 systems with advanced orchestration needs. Below that, well-architected custom connectors (event-driven, REST API, queues) are often more suitable and less costly.
02 How to manage old/new coexistence during migration?
We migrate flows one by one, maintaining both paths in parallel (old + new). Each flow is validated in production before cutting the old one. Strangler fig pattern applied to integrations - zero service interruption.
03 What happens when a system is down?
The architecture includes resilience mechanisms: retry with exponential backoff, circuit breaker to avoid cascading, dead letter queue for unprocessed messages. When the system comes back, pending messages are automatically replayed.
04 How to monitor integration flows?
Real-time dashboards with per-connector metrics: processed volume, latency, error rate, pending messages. Intelligent alerting with dynamic thresholds and automatic escalation. Correlation with business events (order peaks, promotions).
05 How to integrate a legacy ERP (Cegid, SAP) with modern e-commerce?
Via an abstraction layer (anti-corruption layer) that translates ERP contracts into modern APIs. ERP data (products, stock, prices, orders) is synchronized via dedicated connectors with transformation and validation. The ERP remains the financial source of truth, e-commerce the experience source of truth.

Ready to make your IS integrations reliable?

Thirty minutes with an architect - the person who will scope your project, and ship it. We analyze your current flows and identify fragility points - no commitment.

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