5 Critical Lessons from 3.5 Years of Odoo

I've learned that successful ERP implementation is way more than just writing code. It's about understanding business, managing expectations, and building systems that people actually want to use.
Here are the lessons that shaped my approach to Odoo development: Current business workflows (how they work NOW, not how they should work)
Pain points (what takes too long, what creates errors, what frustrates teams)
Goals (what does success look like for them?) Why it matters: A well-customized module built on wrong assumptions is worse than no customization at all. I've seen clients reject perfectly coded solutions because they didn't solve the actual problem.
Practical tip: Create a detailed Functional Specification Document (FSD) with the client before development. This isn't bureaucracy—it's alignment. When stakeholders sign off on requirements, you avoid 90% of mid-project pivots. Does Odoo have a standard feature for this?
Can we achieve this with configuration instead of code?
What's the cost of maintaining this custom code long-term? The 20% rule: Only customize the 20% that's truly unique to the business. Use standard features for the rest.
Real example: A client wanted a custom approval workflow. Instead of building custom modules, we configured Odoo's standard workflow automation with mail templates and access rules. Took 1 week instead of 3, and the client could modify it themselves later. It's not just testing functionality—it's validating that the system solves real business problems
It's where end-users see the system for the first time and realize what they actually need
It's your last chance to catch misunderstandings before go-live Start UAT early (not at the end)
Involve actual end-users (not just managers)
Test complete business journeys, not just individual features
Document issues as "Blockers", "Critical", "Nice-to-have"
Create a UAT sign-off document (legal protection + alignment) Lesson learned: A 2-week UAT period caught issues that would have cost months to fix in production. It's not overhead—it's insurance. Unoptimized database queries (loops in Python code accessing DB repeatedly)
Missing indexes on frequently-filtered fields
Computed fields recalculating unnecessarily
Poor caching strategy
Server-side rendering of heavy reports What I learned to do: Profile the system early (identify bottlenecks before they're critical)
Use Odoo's built-in profiling tools
Optimize database queries (watch for N+1 query problems)
Implement proper indexing
Cache aggressively (cached computed fields, cached reports)
Test with realistic data volumes (what works with 1000 records might fail with 1M) Small wins: Simple optimizations—adding one index, caching a heavy computation—can cut report generation time from 30 seconds to 2 seconds. Create user guides (specific to their workflows, not generic Odoo docs)
Conduct hands-on training sessions (not just documentation dumps)
Record training videos for common tasks
Build a internal knowledge base so users can self-serve
Plan for ongoing support (first 3 months especially critical) Why it works: Users who understand the system adopt it faster, make fewer errors, and provide better feedback for improvements. Bonus: Know When to Say No
This took years to learn, but sometimes the best thing you can do is tell a client: "We can build that, but here's why it's not a good idea."
Maybe it's: "This needs 6 months custom development when a standard feature does 95% of what you need"
"This violates your audit trail and creates compliance issues"
"This will make future upgrades painful" Good clients respect this. They hired you for expertise, not just to say yes to everything. Final Thought
Odoo implementation is a craft. It's not just about Python, ORM, and database queries. It's about understanding business, managing complexity, and delivering systems that solve real problems in sustainable ways.
The developers who succeed long-term are the ones who think beyond code—who understand why they're building something and whether it's actually solving the problem.
If you're starting your Odoo journey, remember: the business logic matters more than the code elegance. Understand the business first, code second. What's your biggest lesson from ERP implementation? Drop it in the comments—would love to learn from your experience. Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse - Understand the Business First, Code Later
This was my biggest realization early on. I used to jump straight into customization—building modules before really understanding what the client actually needed.
What changed: Before touching code, I now spend time understanding: - Standard Features Are Your Best Friend (Most of the Time)
Early in my career, I thought custom = better. I'd customize everything. More features, more control, surely more value?
Reality check: Every customization adds complexity, maintenance overhead, and makes upgrades painful.
What I learned: Odoo's standard modules (Sales, Inventory, Accounting, CRM, POS) are battle-tested and solve 80% of most business needs. Before you customize, ask: - UAT (User Acceptance Testing) Can Make or Break Implementation
I used to think UAT was QA's job. Wrong. UAT is where your implementation either succeeds or fails spectacularly.
Why UAT is critical: - Performance Matters (More Than You Think)
Nothing kills user adoption faster than a slow system. I've seen perfectly functional Odoo instances get rejected because they're laggy.
Common performance killers: - Training & Documentation Are Part of the Delivery
This is where most implementations fail silently. You deliver a great system, but users don't know how to use it. Six months later, they're doing workarounds because they never learned the proper workflow.
What I do now: