Post-acquisition integration is the moment when two software systems become one — or don't.
Acquisitions create software integration challenges: merging customer databases, unifying authentication systems, combining product functionality, and connecting the backend systems of two companies that were built independently. We build the integration infrastructure that makes the acquisition value real.
Acquired company or acquiring company that needs to integrate two separate software systems — customer data, authentication, product functionality, or backend operations — after an acquisition
Post-acquisition software integration is one of the most technically complex projects in software engineering. Two companies, built by different teams with different technology choices, different data models, and different operational assumptions, need to become operationally unified.
The common integration challenges:
Customer database merging. Two customer databases with overlapping customers (the same customer bought from both companies), different field schemas, and different customer ID systems. Deduplication, conflict resolution, and migration into a single source of truth.
Authentication system merging. Both products have their own user accounts, potentially with different auth providers (Clerk, Auth0, Firebase Auth, or custom). Users of the acquired product need to be able to log in without creating a new account.
Product feature integration. If the acquisition was for product capabilities, the features from the acquired product need to be available within the acquiring product's interface. This is a product and engineering challenge simultaneously.
API and backend system connections. The two companies' backend systems — billing, CRM, support, analytics — need to exchange data. The acquiree's customers need to appear in the acquirer's CRM; the acquiree's billing data needs to roll up to consolidated reporting.
Branding and domain unification. The acquired product's brand, domain, and URL structure needs to be consolidated under the acquirer's brand — with redirects, notification sequences to existing users, and documentation updates.
Unified software infrastructure: merged customer database, unified authentication, combined product functionality, and the backend integration that makes the acquisition operational
Customer database migration
Schema mapping from the acquiree's data model to the acquirer's. Deduplication of overlapping customer records. Migration with validation and rollback plan.
Authentication unification
Single sign-on for users of both products. Magic link migration for users of the acquired product to create accounts in the unified system. Credential migration where possible.
API bridge
Event-driven synchronization between the two companies' backend systems. Webhook consumers that propagate key events (new customer, payment, cancellation) between the two systems.
Feature integration
The acquired product's features surfaced within the acquirer's application. Shared navigation, shared customer context, unified billing.
Domain and redirect management
Subdomain consolidation, 301 redirects from the acquired product's URLs, and SEO transition management.
One honest number to start.
Fixed-scope, fixed-price. The number below is the starting point — final scope is built from your brief.
Unified software infrastructure: merged customer database, unified authentication, combined product functionality, and the backend integration that makes the acquisition operational
Three steps, every time.
The same repeatable engagement on every project. No surprises, no mystery, no billable ambiguity.
Brief & discovery.
We send you questions, then get on a call. Output: a written scope with every step, feature, and integration listed.
Build & ship.
Fixed schedule, weekly reviews. No scope creep unless you change the scope — and if you do, we reprice it transparently.
Warranty & retainer.
30-day warranty on every launch. Most clients stay on a monthly retainer for ongoing features and maintenance.
Why Fixed-Price Matters Here
Post-acquisition integrations are scoped by the specific systems being integrated. Fixed price per scope.
Related engagements.
Questions, answered.
A focused data migration and auth unification project: 8–12 weeks. Full product integration (feature merging, UI unification): 16–24 weeks depending on scope.
Different stacks are the norm in acquisitions. The integration layer is built on the acquirer's stack; the acquired system may run in parallel during the migration period. Full stack migration (rewriting the acquired product on the acquirer's stack) is a different engagement.
Data migration + auth unification + API bridge: from $45k. Full product integration: from $75k. Fixed-price per scope.
Tell Ryel about your project.
Describe what you’re building and what outcome you need. You’ll have a written, fixed-price scope within the week.