Choosing a tech stack is one of the earliest technical decisions in building a product, and one of the hardest to reverse. Pick well and your team moves quickly, hiring is easy and the product scales. Pick badly and you'll fight your tools for years. The good news: the right choice is usually less about the newest technology and more about a few practical criteria. Here's how to decide.
What a tech stack includes
| Layer | What it does | Common options |
|---|---|---|
| Front end | What users see and interact with | React, Next.js, Vue, Svelte |
| Mobile | Native or cross-platform apps | React Native, Expo, Flutter, Swift, Kotlin |
| Back end | Business logic and APIs | Node.js, Python, PHP (Laravel), Ruby on Rails, Go |
| Database | Stores data | PostgreSQL, MySQL, MongoDB |
| Hosting | Runs the application | Vercel, AWS, Google Cloud, Azure |
| Services | Auth, payments, email, search | Supabase, Stripe, Resend, Algolia |
The criteria that matter most
1. Team expertise
The best stack is often the one your team, or the team you can hire, knows well. Productivity and quality come from familiarity.
2. Maturity and ecosystem
Mature technologies have more libraries, documentation, answers to common problems and security fixes.
3. Hiring
Can you find developers for this stack in your market and budget? Popular stacks make hiring and handover far easier.
4. Fit for the product
| Product need | Suits |
|---|---|
| Content-heavy marketing site with SEO | Next.js, static generation, headless CMS |
| SaaS dashboard | React or Next.js front end, PostgreSQL, a robust back end |
| Real-time features | Technologies with strong real-time support, such as WebSockets or managed real-time databases |
| Mobile app for iOS and Android | React Native/Expo or Flutter |
| Heavy data processing or AI | Python is common for data and machine learning work |
5. Scalability
Most stacks scale further than a startup needs early on. Architecture and database design usually matter more than language choice.
6. Cost
Consider development time, hosting, licences and ongoing maintenance, not just the price of tools.
7. Security and compliance
Choose technologies and providers that support your security, privacy and regulatory requirements.
Common, proven stacks
| Stack | Typical use | Strengths |
|---|---|---|
| Next.js + TypeScript + PostgreSQL (e.g. via Supabase) + Vercel | SaaS, web apps, marketing sites | Fast development, strong SEO, one language end to end |
| React Native / Expo + Node.js API | Cross-platform mobile apps | Shared code across iOS, Android and web |
| Laravel (PHP) + MySQL | Business web applications | Mature, productive, large ecosystem |
| Django (Python) + PostgreSQL | Data-heavy apps, AI integrations | Batteries included, strong data tooling |
| Ruby on Rails + PostgreSQL | Rapid product development | Conventions that speed up building |
Build vs buy for each layer
Don't build what you can rent reliably: authentication, payments, email delivery and search are often better as managed services. Focus your custom development on what makes your product unique. Our article on custom software vs off-the-shelf tools covers this trade-off.
Mistakes to avoid
- Choosing a technology because it's new or fashionable
- Picking a niche language that makes hiring hard
- Building custom infrastructure too early
- Using many different languages and databases in a small team
- Ignoring how the product will be maintained after launch
- Over-engineering for scale you don't have yet
Questions to ask before deciding
- What does the product need to do in its first year?
- Who will build and maintain it?
- How easy is it to hire for this stack?
- Which parts can we use managed services for?
- What are the security and compliance requirements?
- What will it cost to run and maintain?
Keep options open
- Use a clean, modular architecture
- Keep business logic separate from frameworks where practical
- Document decisions and why they were made
- Avoid deep lock-in to a single vendor for core data
Example decisions for three products
| Product | Likely stack | Why |
|---|---|---|
| B2B SaaS dashboard | Next.js, TypeScript, PostgreSQL, managed auth, Stripe | Fast development, one language, strong ecosystem |
| Booking app for iPhone and Android | React Native with Expo, a Node.js or Supabase backend | One codebase for both stores, shared logic with web |
| Content-heavy marketing site | Next.js with a headless CMS, deployed to an edge platform | Speed, SEO and easy editing |
These are starting points, not rules. The team's experience and the product's specific needs can point elsewhere.
Total cost of ownership checklist
- Development time to build the first version
- Hosting and infrastructure at current and expected scale
- Licences and third-party service fees
- Ongoing maintenance and security updates
- Hiring and onboarding costs for the stack
- Monitoring, backups and support
- Cost of switching away later, if needed
Comparing stacks on total cost of ownership, rather than build cost alone, often changes the decision.
How we help
We usually build with Next.js, TypeScript and PostgreSQL for web products and React Native with Expo for mobile, and adapt when a project needs something different. Our SaaS MVP and custom web application services start with this decision, and our vendor and platform selection consulting provides an independent view.
The short version
Choose a stack your team knows, with a mature ecosystem and an easy hiring market, that fits the product's needs. Use managed services for commodity features, avoid fashionable or niche choices, keep the architecture modular and plan for maintenance from day one.
