If you already know you need a senior Go engineer, or a React developer who can own a design system, generic hiring advice wastes your time. What you need when you hire developers by tech stack is a straight answer to three questions for that specific stack: what senior actually means there, what it costs in Europe and the US, and how you test for it before you make an offer. Each stack gets its own answer, because "senior" means something different in Go than it does in React.
This collection is for a CTO or hiring manager who has already scoped the role and just needs the specifics. Maybe you're deciding between a Python and a Node.js backend hire, or you're not sure whether a candidate who calls themselves a senior React developer actually is one. Each guide takes one stack and works through it in the same order: current rates in Europe and the US, the concrete signals that separate a senior engineer from a mid-level one in that stack, a hands-on vetting exercise you can run before a full interview loop, a set of interview questions built to catch candidates who talk well but haven't shipped, and a comparison of staff augmentation against a full-time hire for that role.
Backend coverage runs across Python, Django specifically, Node.js, Go, and TypeScript, since each has its own idea of what "senior" looks like and its own failure modes when you get the hire wrong. Frontend coverage centers on React, still the default choice for most product teams and still the stack where the gap between a portfolio project and a production codebase shows up fastest. Mobile gets the deepest treatment: iOS, Android, Flutter, React Native, Kotlin Multiplatform, and SwiftUI each have a dedicated guide, because mobile hiring mistakes are expensive to unwind once an app is in two app stores. DevOps gets its own guide, and fintech gets treated as a domain rather than a stack, because a fintech hire needs compliance and audit-trail instincts that don't show up in a normal technical screen.
Some of the hardest hiring mistakes happen before you write the job post, when you pick the wrong stack for the problem. That's why this collection also holds stack-decision guides: Flutter versus React Native, SwiftUI versus UIKit, Kotlin Multiplatform and Compose Multiplatform, and Flutter state management. Get the stack decision wrong and every hire downstream of it inherits the mistake. A team that picks React Native for a project that actually needs heavy native hardware access will spend the next year fighting the framework instead of the competition, no matter how good the engineer they hire is. Settle the stack decision first if it's still open, then move to the hiring guide for whichever stack you land on.
Every hiring guide by stack
- Hire Django developers: rates, vetting & interview guide: Hire Django developers in 2026: EU/US rates, how to vet for ORM and Celery judgment, and when Django beats FastAPI for your backend.
- Flutter vs React Native in 2026: how to actually choose: Flutter's Impeller and React Native's New Architecture both ship by default now. Here's the real decision framework, plus what each costs to staff.
- SwiftUI vs UIKit: what to build with, and who to hire: SwiftUI vs UIKit for Xcode 27: when to use each, how UIHostingController and UIViewRepresentable let you mix them, and what to test for when hiring.
- Kotlin Multiplatform: a CTO's guide to adoption: A CTO's guide to Kotlin Multiplatform: 2026 stability by target, iOS interop, the migration path for existing apps, and who to hire.
- Compose Multiplatform: what's stable enough to ship: What's stable in Compose Multiplatform on iOS, desktop and web per JetBrains' own release notes, and what it changes for Android and iOS UI staffing.
- Flutter state management: setState to MVVM: Compare Flutter state management options against Flutter's own MVVM architecture guide, plus what to check when hiring Flutter engineers.
- Hire Flutter developers: rates, vetting & interview guide: EU/US Flutter developer rates for 2026, an Impeller and platform-channel vetting checklist, and interview questions that spot real Flutter hires.
- Hire Golang developers: rates, vetting & interview guide: Hire Golang developers in 2026: EU/US rates, how to vet for concurrency judgment and goroutine leaks, and when Go beats Node or Python for your backend.
- How to hire fintech developers under DORA and GDPR: Hiring engineers for a fintech product in the EU? What DORA, GDPR and PCI DSS require from a staff-augmentation contract, and the skills to vet for.
- Hire DevOps engineers: rates, vetting & interview guide: Hire DevOps engineers in 2026: EU/US rates, what senior DevOps means, how to vet for IaC and incident response, and staff aug vs FTE.
- Hire React Native developers in 2026: rates & vetting: EU/US React Native developer rates for 2026, a vetting checklist for New Architecture skills, and interview questions that spot true RN hires.
- How to hire backend developers: what seniority means and how to test it
- Hire senior iOS developers in 2026: rates, vetting, 72hrs
- How to hire Android developers (your no-BS guide)
- How to hire Node.js developers in 2026: rates, vetting & interview guide
- Hire Python developers: rates, vetting & interview guide
- How to hire React developers in 2026: rates, vetting & interview guide
- Hire TypeScript developers: rates, vetting & interview guide
- How to hire senior React developers in 72 hours
- Hire remote mobile developers in 72 hours
- Interview: Is Kotlin Multiplatform the solution we've been waiting for?
- Interview: How Flutter ships features faster
- CTO’s guide to declarative UIs
- A pragmatic look at PWA vs. native
FAQ
How is hiring for a specific tech stack different from a general developer search?
A general search filters on years of experience and a list of languages a candidate has touched. A stack-specific search filters on what that stack actually demands at a senior level: native module debugging for React Native, migration discipline for Django, or IAM and secrets hygiene for DevOps. Skip that filter and you'll interview candidates who look qualified on paper and can't answer the questions that matter for the job.
Should I always hire a specialist for the exact stack I'm using?
Not always. Strong engineers move between adjacent stacks faster than a job posting implies, and a senior backend engineer with deep Python experience can usually pick up Go competently within weeks. What doesn't transfer as easily is platform-specific depth: native mobile development, infrastructure automation, and anything touching compliance. Weigh how much of the job is language syntax against how much is platform-specific judgment before you decide how strict to be.
Does staff augmentation work the same way across every stack?
The staff augmentation decision runs on the same logic everywhere: it fits work that's real but not yet permanent, and it lets you bring in a senior engineer for a specific stack without committing to a full-time seat before you know the workload justifies one. What changes by stack is the compliance exposure. A DevOps or fintech hire typically touches production access, customer data, or audit requirements that a frontend hire doesn't, so the sourcing decision carries more weight in those stacks than in others.