ERP and app development: one partner or two?

Growing businesses often need Odoo or another ERP implemented and a custom web or mobile app built on top of it, for example a customer portal, a field-service app, or a dashboard. The question of whether to hire one partner for both or split the work across an ERP specialist and a separate development shop comes up constantly, and the right answer depends on how tightly the app and the ERP need to talk to each other.

The case for one partner

When the app needs live, two-way data with the ERP (for example, a field app that writes job completions straight into the ERP, or a portal that must always reflect current invoice status), a single partner responsible for both sides removes a coordination problem. There is one team that understands the ERP's data model and the app's requirements together, one place accountability sits when something breaks at the connection point, and no finger-pointing between an ERP vendor and an app vendor about whose API changed or whose bug caused a sync failure.

The condition that makes this work is that the partner is actually competent at both disciplines, not simply willing to take on app work alongside ERP work. Ask for separate reference projects: one where they implemented the ERP, one where they built a comparable custom app, ideally with the two connected to each other, not just two unrelated case studies.

The case for splitting the work

Splitting makes more sense when the app is loosely coupled to the ERP, for example a standalone tool that only needs an occasional data export rather than live two-way sync, or when you already have a strong relationship with an ERP partner and a separate specialist is clearly stronger at the specific app platform (iOS, a particular web framework) you need. In that case, the integration risk is smaller and the benefit of picking the best specialist for each half can outweigh the coordination cost.

If you do split the work, name an explicit owner for the integration itself, not just the two sides of it. Someone, whether that is you, one of the two vendors, or a third party, needs to own the contract between the systems: what data moves, how often, what happens on failure, and who gets paged when it breaks.

How to decide for your project

• Live, two-way data between the app and ERP: lean toward one partner for both.
• Occasional, one-way data export, or a largely standalone app: splitting is lower-risk.
• Either way, get a written integration contract: what data moves, on what schedule, through which API, and who is accountable when it fails.
• Verify competence in both disciplines separately before hiring a single partner for both; do not assume general software capability extends to a specific ERP's data model.