Most technical due diligence on a development partner happens too late, usually after the contract is signed and the first sprint reveals gaps that a few pointed questions upfront would have caught. Here's a more useful framework, aimed at the actual technical decisions that determine whether a build holds up under real usage.
Architecture conversation, not architecture buzzwords. Any agency can say "microservices" or "API-first" in a pitch deck. What you want is a specific answer to a specific scenario relevant to your product: how would they structure multi-tenant data isolation for your use case, what's their default approach to caching and real-time data sync if your product needs it, and how do they think about the tradeoff between shipping fast and building for scale from day one. If the answers stay abstract, that's a signal the depth isn't there.
Stack rationale, not stack preference. A competent team can explain why they'd choose Node.js versus a Python framework for your specific backend needs, why PostgreSQL over a NoSQL alternative for your data model, and what their reasoning is for infrastructure choices like AWS versus GCP given your compliance and scaling requirements. If the stack choice sounds like "it's what we always use" rather than something evaluated against your actual constraints, dig deeper.
How they handle spec ambiguity mid-sprint. Every real project hits moments where the requirements doc doesn't cover an edge case, or two stated requirements conflict. Ask how their team surfaces and resolves that in practice. Teams with a mature process flag it immediately and get a fast decision. Teams without one either quietly make an assumption that surfaces as a bug later, or stall the sprint waiting on you.
Integration and API philosophy. If your product needs to connect to third-party systems, whether that's a payment processor, a CRM, or an industry-specific tool, ask how they approach API design and webhook architecture. An open, well-documented internal API is a very different engineering commitment than a tightly coupled system that resists future integrations.
What "done" actually includes. Confirm explicitly whether their delivery includes CI/CD setup, monitoring and alerting, load testing, and security review, or whether those are treated as separate add-ons you'll need to source elsewhere. This single question exposes a lot about how seriously a team treats production readiness versus a demo-ready build.
If you're currently evaluating partners and want a reference point for what a full-cycle technical process looks like end to end, from discovery through deployment and ongoing support, Softflux has a breakdown worth comparing against other proposals you're weighing.
The technical questions you ask before signing a contract are cheaper than the ones you're forced to ask after.
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